in src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp [488:3201]
void BytecodeInterpreter::run(interpreterState istate) {
intptr_t* topOfStack = (intptr_t *)istate->stack(); /* access with STACK macros */
address pc = istate->bcp();
jubyte opcode;
intptr_t* locals = istate->locals();
ConstantPoolCache* cp = istate->constants(); // method()->constants()->cache()
#ifdef LOTS_OF_REGS
JavaThread* THREAD = istate->thread();
#else
#undef THREAD
#define THREAD istate->thread()
#endif
#ifdef ASSERT
assert(labs(istate->stack_base() - istate->stack_limit()) == (istate->method()->max_stack() + 1),
"Bad stack limit");
/* QQQ this should be a stack method so we don't know actual direction */
assert(topOfStack >= istate->stack_limit() && topOfStack < istate->stack_base(),
"Stack top out of range");
// Verify linkages.
interpreterState l = istate;
do {
assert(l == l->_self_link, "bad link");
l = l->_prev_link;
} while (l != nullptr);
// Screwups with stack management usually cause us to overwrite istate
// save a copy so we can verify it.
interpreterState orig = istate;
#endif
#ifdef USELABELS
const static void* const opclabels_data[256] = {
/* 0x00 */ &&opc_nop, &&opc_aconst_null, &&opc_iconst_m1, &&opc_iconst_0,
/* 0x04 */ &&opc_iconst_1, &&opc_iconst_2, &&opc_iconst_3, &&opc_iconst_4,
/* 0x08 */ &&opc_iconst_5, &&opc_lconst_0, &&opc_lconst_1, &&opc_fconst_0,
/* 0x0C */ &&opc_fconst_1, &&opc_fconst_2, &&opc_dconst_0, &&opc_dconst_1,
/* 0x10 */ &&opc_bipush, &&opc_sipush, &&opc_ldc, &&opc_ldc_w,
/* 0x14 */ &&opc_ldc2_w, &&opc_iload, &&opc_lload, &&opc_fload,
/* 0x18 */ &&opc_dload, &&opc_aload, &&opc_iload_0, &&opc_iload_1,
/* 0x1C */ &&opc_iload_2, &&opc_iload_3, &&opc_lload_0, &&opc_lload_1,
/* 0x20 */ &&opc_lload_2, &&opc_lload_3, &&opc_fload_0, &&opc_fload_1,
/* 0x24 */ &&opc_fload_2, &&opc_fload_3, &&opc_dload_0, &&opc_dload_1,
/* 0x28 */ &&opc_dload_2, &&opc_dload_3, &&opc_aload_0, &&opc_aload_1,
/* 0x2C */ &&opc_aload_2, &&opc_aload_3, &&opc_iaload, &&opc_laload,
/* 0x30 */ &&opc_faload, &&opc_daload, &&opc_aaload, &&opc_baload,
/* 0x34 */ &&opc_caload, &&opc_saload, &&opc_istore, &&opc_lstore,
/* 0x38 */ &&opc_fstore, &&opc_dstore, &&opc_astore, &&opc_istore_0,
/* 0x3C */ &&opc_istore_1, &&opc_istore_2, &&opc_istore_3, &&opc_lstore_0,
/* 0x40 */ &&opc_lstore_1, &&opc_lstore_2, &&opc_lstore_3, &&opc_fstore_0,
/* 0x44 */ &&opc_fstore_1, &&opc_fstore_2, &&opc_fstore_3, &&opc_dstore_0,
/* 0x48 */ &&opc_dstore_1, &&opc_dstore_2, &&opc_dstore_3, &&opc_astore_0,
/* 0x4C */ &&opc_astore_1, &&opc_astore_2, &&opc_astore_3, &&opc_iastore,
/* 0x50 */ &&opc_lastore, &&opc_fastore, &&opc_dastore, &&opc_aastore,
/* 0x54 */ &&opc_bastore, &&opc_castore, &&opc_sastore, &&opc_pop,
/* 0x58 */ &&opc_pop2, &&opc_dup, &&opc_dup_x1, &&opc_dup_x2,
/* 0x5C */ &&opc_dup2, &&opc_dup2_x1, &&opc_dup2_x2, &&opc_swap,
/* 0x60 */ &&opc_iadd, &&opc_ladd, &&opc_fadd, &&opc_dadd,
/* 0x64 */ &&opc_isub, &&opc_lsub, &&opc_fsub, &&opc_dsub,
/* 0x68 */ &&opc_imul, &&opc_lmul, &&opc_fmul, &&opc_dmul,
/* 0x6C */ &&opc_idiv, &&opc_ldiv, &&opc_fdiv, &&opc_ddiv,
/* 0x70 */ &&opc_irem, &&opc_lrem, &&opc_frem, &&opc_drem,
/* 0x74 */ &&opc_ineg, &&opc_lneg, &&opc_fneg, &&opc_dneg,
/* 0x78 */ &&opc_ishl, &&opc_lshl, &&opc_ishr, &&opc_lshr,
/* 0x7C */ &&opc_iushr, &&opc_lushr, &&opc_iand, &&opc_land,
/* 0x80 */ &&opc_ior, &&opc_lor, &&opc_ixor, &&opc_lxor,
/* 0x84 */ &&opc_iinc, &&opc_i2l, &&opc_i2f, &&opc_i2d,
/* 0x88 */ &&opc_l2i, &&opc_l2f, &&opc_l2d, &&opc_f2i,
/* 0x8C */ &&opc_f2l, &&opc_f2d, &&opc_d2i, &&opc_d2l,
/* 0x90 */ &&opc_d2f, &&opc_i2b, &&opc_i2c, &&opc_i2s,
/* 0x94 */ &&opc_lcmp, &&opc_fcmpl, &&opc_fcmpg, &&opc_dcmpl,
/* 0x98 */ &&opc_dcmpg, &&opc_ifeq, &&opc_ifne, &&opc_iflt,
/* 0x9C */ &&opc_ifge, &&opc_ifgt, &&opc_ifle, &&opc_if_icmpeq,
/* 0xA0 */ &&opc_if_icmpne, &&opc_if_icmplt, &&opc_if_icmpge, &&opc_if_icmpgt,
/* 0xA4 */ &&opc_if_icmple, &&opc_if_acmpeq, &&opc_if_acmpne, &&opc_goto,
/* 0xA8 */ &&opc_jsr, &&opc_ret, &&opc_tableswitch, &&opc_lookupswitch,
/* 0xAC */ &&opc_ireturn, &&opc_lreturn, &&opc_freturn, &&opc_dreturn,
/* 0xB0 */ &&opc_areturn, &&opc_return, &&opc_getstatic, &&opc_putstatic,
/* 0xB4 */ &&opc_getfield, &&opc_putfield, &&opc_invokevirtual, &&opc_invokespecial,
/* 0xB8 */ &&opc_invokestatic, &&opc_invokeinterface, &&opc_invokedynamic, &&opc_new,
/* 0xBC */ &&opc_newarray, &&opc_anewarray, &&opc_arraylength, &&opc_athrow,
/* 0xC0 */ &&opc_checkcast, &&opc_instanceof, &&opc_monitorenter, &&opc_monitorexit,
/* 0xC4 */ &&opc_wide, &&opc_multianewarray, &&opc_ifnull, &&opc_ifnonnull,
/* 0xC8 */ &&opc_goto_w, &&opc_jsr_w, &&opc_breakpoint, &&opc_fast_agetfield,
/* 0xCC */ &&opc_fast_bgetfield,&&opc_fast_cgetfield, &&opc_fast_dgetfield, &&opc_fast_fgetfield,
/* 0xD0 */ &&opc_fast_igetfield,&&opc_fast_lgetfield, &&opc_fast_sgetfield, &&opc_fast_aputfield,
/* 0xD4 */ &&opc_fast_bputfield,&&opc_fast_zputfield, &&opc_fast_cputfield, &&opc_fast_dputfield,
/* 0xD8 */ &&opc_fast_fputfield,&&opc_fast_iputfield, &&opc_fast_lputfield, &&opc_fast_sputfield,
/* 0xDC */ &&opc_fast_aload_0, &&opc_fast_iaccess_0, &&opc_fast_aaccess_0, &&opc_fast_faccess_0,
/* 0xE0 */ &&opc_fast_iload, &&opc_fast_iload2, &&opc_fast_icaload, &&opc_fast_invokevfinal,
/* 0xE4 */ &&opc_default, &&opc_default, &&opc_fast_aldc, &&opc_fast_aldc_w,
/* 0xE8 */ &&opc_return_register_finalizer,
&&opc_invokehandle, &&opc_nofast_getfield,&&opc_nofast_putfield,
/* 0xEC */ &&opc_nofast_aload_0,&&opc_nofast_iload, &&opc_default, &&opc_default,
/* 0xF0 */ &&opc_default, &&opc_default, &&opc_default, &&opc_default,
/* 0xF4 */ &&opc_default, &&opc_default, &&opc_default, &&opc_default,
/* 0xF8 */ &&opc_default, &&opc_default, &&opc_default, &&opc_default,
/* 0xFC */ &&opc_default, &&opc_default, &&opc_default, &&opc_default
};
uintptr_t *dispatch_table = (uintptr_t*)&opclabels_data[0];
#endif /* USELABELS */
switch (istate->msg()) {
case initialize: {
ShouldNotCallThis();
return;
}
case method_entry: {
THREAD->set_do_not_unlock_if_synchronized(true);
// Lock method if synchronized.
if (METHOD->is_synchronized()) {
// oop rcvr = locals[0].j.r;
oop rcvr;
if (METHOD->is_static()) {
rcvr = METHOD->constants()->pool_holder()->java_mirror();
} else {
rcvr = LOCALS_OBJECT(0);
VERIFY_OOP(rcvr);
}
// The initial monitor is ours for the taking.
BasicObjectLock* mon = &istate->monitor_base()[-1];
mon->set_obj(rcvr);
CALL_VM(InterpreterRuntime::monitorenter(THREAD, mon), handle_exception);
}
THREAD->set_do_not_unlock_if_synchronized(false);
// Notify jvmti.
// Whenever JVMTI puts a thread in interp_only_mode, method
// entry/exit events are sent for that thread to track stack depth.
if (JVMTI_ENABLED && THREAD->is_interp_only_mode()) {
CALL_VM(InterpreterRuntime::post_method_entry(THREAD),
handle_exception);
}
goto run;
}
case popping_frame: {
// returned from a java call to pop the frame, restart the call
// clear the message so we don't confuse ourselves later
assert(THREAD->pop_frame_in_process(), "wrong frame pop state");
istate->set_msg(no_request);
THREAD->clr_pop_frame_in_process();
goto run;
}
case method_resume: {
if ((istate->_stack_base - istate->_stack_limit) != istate->method()->max_stack() + 1) {
// resume
os::breakpoint();
}
// returned from a java call, continue executing.
if (THREAD->has_pending_popframe() && !THREAD->pop_frame_in_process()) {
goto handle_Pop_Frame;
}
if (THREAD->jvmti_thread_state() &&
THREAD->jvmti_thread_state()->is_earlyret_pending()) {
goto handle_Early_Return;
}
if (THREAD->has_pending_exception()) goto handle_exception;
// Update the pc by the saved amount of the invoke bytecode size
UPDATE_PC(istate->bcp_advance());
goto run;
}
case deopt_resume2: {
// Returned from an opcode that will reexecute. Deopt was
// a result of a PopFrame request.
//
goto run;
}
case deopt_resume: {
// Returned from an opcode that has completed. The stack has
// the result all we need to do is skip across the bytecode
// and continue (assuming there is no exception pending)
//
// compute continuation length
//
// Note: it is possible to deopt at a return_register_finalizer opcode
// because this requires entering the vm to do the registering. While the
// opcode is complete we can't advance because there are no more opcodes
// much like trying to deopt at a poll return. In that has we simply
// get out of here
//
if ( Bytecodes::code_at(METHOD, pc) == Bytecodes::_return_register_finalizer) {
// this will do the right thing even if an exception is pending.
goto handle_return;
}
UPDATE_PC(Bytecodes::length_at(METHOD, pc));
if (THREAD->has_pending_exception()) goto handle_exception;
goto run;
}
case got_monitors: {
// continue locking now that we have a monitor to use
// we expect to find newly allocated monitor at the "top" of the monitor stack.
oop lockee = STACK_OBJECT(-1);
VERIFY_OOP(lockee);
// derefing's lockee ought to provoke implicit null check
// find a free monitor
BasicObjectLock* entry = (BasicObjectLock*) istate->stack_base();
assert(entry->obj() == nullptr, "Frame manager didn't allocate the monitor");
entry->set_obj(lockee);
CALL_VM(InterpreterRuntime::monitorenter(THREAD, entry), handle_exception);
UPDATE_PC_AND_TOS(1, -1);
goto run;
}
default: {
fatal("Unexpected message from frame manager");
}
}
run:
DO_UPDATE_INSTRUCTION_COUNT(*pc)
DEBUGGER_SINGLE_STEP_NOTIFY();
#ifdef PREFETCH_OPCCODE
opcode = *pc; /* prefetch first opcode */
#endif
#ifndef USELABELS
while (1)
#endif
{
#ifndef PREFETCH_OPCCODE
opcode = *pc;
#endif
// Seems like this happens twice per opcode. At worst this is only
// need at entry to the loop.
// DEBUGGER_SINGLE_STEP_NOTIFY();
/* Using this labels avoids double breakpoints when quickening and
* when returning from transition frames.
*/
opcode_switch:
assert(istate == orig, "Corrupted istate");
/* QQQ Hmm this has knowledge of direction, ought to be a stack method */
assert(topOfStack >= istate->stack_limit(), "Stack overrun");
assert(topOfStack < istate->stack_base(), "Stack underrun");
#ifdef USELABELS
DISPATCH(opcode);
#else
switch (opcode)
#endif
{
CASE(_nop):
UPDATE_PC_AND_CONTINUE(1);
/* Push miscellaneous constants onto the stack. */
CASE(_aconst_null):
SET_STACK_OBJECT(nullptr, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
#undef OPC_CONST_n
#define OPC_CONST_n(opcode, const_type, value) \
CASE(opcode): \
SET_STACK_ ## const_type(value, 0); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
OPC_CONST_n(_iconst_m1, INT, -1);
OPC_CONST_n(_iconst_0, INT, 0);
OPC_CONST_n(_iconst_1, INT, 1);
OPC_CONST_n(_iconst_2, INT, 2);
OPC_CONST_n(_iconst_3, INT, 3);
OPC_CONST_n(_iconst_4, INT, 4);
OPC_CONST_n(_iconst_5, INT, 5);
OPC_CONST_n(_fconst_0, FLOAT, 0.0);
OPC_CONST_n(_fconst_1, FLOAT, 1.0);
OPC_CONST_n(_fconst_2, FLOAT, 2.0);
#undef OPC_CONST2_n
#define OPC_CONST2_n(opcname, value, key, kind) \
CASE(_##opcname): \
{ \
SET_STACK_ ## kind(VM##key##Const##value(), 1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2); \
}
OPC_CONST2_n(dconst_0, Zero, double, DOUBLE);
OPC_CONST2_n(dconst_1, One, double, DOUBLE);
OPC_CONST2_n(lconst_0, Zero, long, LONG);
OPC_CONST2_n(lconst_1, One, long, LONG);
/* Load constant from constant pool: */
/* Push a 1-byte signed integer value onto the stack. */
CASE(_bipush):
SET_STACK_INT((jbyte)(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
/* Push a 2-byte signed integer constant onto the stack. */
CASE(_sipush):
SET_STACK_INT((int16_t)Bytes::get_Java_u2(pc + 1), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 1);
/* load from local variable */
CASE(_aload):
VERIFY_OOP(LOCALS_OBJECT(pc[1]));
SET_STACK_OBJECT(LOCALS_OBJECT(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
CASE(_iload):
{
if (REWRITE_BYTECODES) {
// Attempt to rewrite iload, iload -> fast_iload2
// iload, caload -> fast_icaload
// Normal iloads will be rewritten to fast_iload to avoid checking again.
switch (*(pc + 2)) {
case Bytecodes::_fast_iload:
REWRITE_AT_PC(Bytecodes::_fast_iload2);
break;
case Bytecodes::_caload:
REWRITE_AT_PC(Bytecodes::_fast_icaload);
break;
case Bytecodes::_iload:
// Wait until rewritten to _fast_iload.
break;
default:
// Last iload in a (potential) series, don't check again.
REWRITE_AT_PC(Bytecodes::_fast_iload);
}
}
// Normal iload handling.
SET_STACK_SLOT(LOCALS_SLOT(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
}
CASE(_nofast_iload):
{
// Normal, non-rewritable iload handling.
SET_STACK_SLOT(LOCALS_SLOT(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
}
CASE(_fast_iload):
CASE(_fload):
SET_STACK_SLOT(LOCALS_SLOT(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
CASE(_fast_iload2):
SET_STACK_SLOT(LOCALS_SLOT(pc[1]), 0);
SET_STACK_SLOT(LOCALS_SLOT(pc[3]), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 2);
CASE(_lload):
SET_STACK_LONG_FROM_ADDR(LOCALS_LONG_AT(pc[1]), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 2);
CASE(_dload):
SET_STACK_DOUBLE_FROM_ADDR(LOCALS_DOUBLE_AT(pc[1]), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 2);
#undef OPC_LOAD_n
#define OPC_LOAD_n(num) \
CASE(_iload_##num): \
CASE(_fload_##num): \
SET_STACK_SLOT(LOCALS_SLOT(num), 0); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1); \
\
CASE(_lload_##num): \
SET_STACK_LONG_FROM_ADDR(LOCALS_LONG_AT(num), 1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2); \
CASE(_dload_##num): \
SET_STACK_DOUBLE_FROM_ADDR(LOCALS_DOUBLE_AT(num), 1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
OPC_LOAD_n(0);
OPC_LOAD_n(1);
OPC_LOAD_n(2);
OPC_LOAD_n(3);
#undef OPC_ALOAD_n
#define OPC_ALOAD_n(num) \
CASE(_aload_##num): { \
oop obj = LOCALS_OBJECT(num); \
VERIFY_OOP(obj); \
SET_STACK_OBJECT(obj, 0); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1); \
}
CASE(_aload_0):
{
/* Maybe rewrite if following bytecode is one of the supported _fast_Xgetfield bytecodes. */
if (REWRITE_BYTECODES) {
switch (*(pc + 1)) {
case Bytecodes::_fast_agetfield:
REWRITE_AT_PC(Bytecodes::_fast_aaccess_0);
break;
case Bytecodes::_fast_fgetfield:
REWRITE_AT_PC(Bytecodes::_fast_faccess_0);
break;
case Bytecodes::_fast_igetfield:
REWRITE_AT_PC(Bytecodes::_fast_iaccess_0);
break;
case Bytecodes::_getfield:
case Bytecodes::_nofast_getfield: {
/* Otherwise, do nothing here, wait until/if it gets rewritten to _fast_Xgetfield.
* Unfortunately, this punishes volatile field access, because it never gets
* rewritten. */
break;
}
default:
REWRITE_AT_PC(Bytecodes::_fast_aload_0);
break;
}
}
// Normal aload_0 handling.
VERIFY_OOP(LOCALS_OBJECT(0));
SET_STACK_OBJECT(LOCALS_OBJECT(0), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_nofast_aload_0):
{
// Normal, non-rewritable aload_0 handling.
VERIFY_OOP(LOCALS_OBJECT(0));
SET_STACK_OBJECT(LOCALS_OBJECT(0), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
OPC_ALOAD_n(1);
OPC_ALOAD_n(2);
OPC_ALOAD_n(3);
/* store to a local variable */
CASE(_astore):
astore(topOfStack, -1, locals, pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -1);
CASE(_istore):
CASE(_fstore):
SET_LOCALS_SLOT(STACK_SLOT(-1), pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -1);
CASE(_lstore):
SET_LOCALS_LONG(STACK_LONG(-1), pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -2);
CASE(_dstore):
SET_LOCALS_DOUBLE(STACK_DOUBLE(-1), pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -2);
CASE(_wide): {
uint16_t reg = Bytes::get_Java_u2(pc + 2);
opcode = pc[1];
// Wide and it's sub-bytecode are counted as separate instructions. If we
// don't account for this here, the bytecode trace skips the next bytecode.
DO_UPDATE_INSTRUCTION_COUNT(opcode);
switch(opcode) {
case Bytecodes::_aload:
VERIFY_OOP(LOCALS_OBJECT(reg));
SET_STACK_OBJECT(LOCALS_OBJECT(reg), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
case Bytecodes::_iload:
case Bytecodes::_fload:
SET_STACK_SLOT(LOCALS_SLOT(reg), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
case Bytecodes::_lload:
SET_STACK_LONG_FROM_ADDR(LOCALS_LONG_AT(reg), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 2);
case Bytecodes::_dload:
SET_STACK_DOUBLE_FROM_ADDR(LOCALS_LONG_AT(reg), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 2);
case Bytecodes::_astore:
astore(topOfStack, -1, locals, reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -1);
case Bytecodes::_istore:
case Bytecodes::_fstore:
SET_LOCALS_SLOT(STACK_SLOT(-1), reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -1);
case Bytecodes::_lstore:
SET_LOCALS_LONG(STACK_LONG(-1), reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -2);
case Bytecodes::_dstore:
SET_LOCALS_DOUBLE(STACK_DOUBLE(-1), reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -2);
case Bytecodes::_iinc: {
int16_t offset = (int16_t)Bytes::get_Java_u2(pc+4);
// Be nice to see what this generates.... QQQ
SET_LOCALS_INT(LOCALS_INT(reg) + offset, reg);
UPDATE_PC_AND_CONTINUE(6);
}
case Bytecodes::_ret:
pc = istate->method()->code_base() + (intptr_t)(LOCALS_ADDR(reg));
UPDATE_PC_AND_CONTINUE(0);
default:
VM_JAVA_ERROR(vmSymbols::java_lang_InternalError(), "undefined opcode");
}
}
#undef OPC_STORE_n
#define OPC_STORE_n(num) \
CASE(_astore_##num): \
astore(topOfStack, -1, locals, num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
CASE(_istore_##num): \
CASE(_fstore_##num): \
SET_LOCALS_SLOT(STACK_SLOT(-1), num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
OPC_STORE_n(0);
OPC_STORE_n(1);
OPC_STORE_n(2);
OPC_STORE_n(3);
#undef OPC_DSTORE_n
#define OPC_DSTORE_n(num) \
CASE(_dstore_##num): \
SET_LOCALS_DOUBLE(STACK_DOUBLE(-1), num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2); \
CASE(_lstore_##num): \
SET_LOCALS_LONG(STACK_LONG(-1), num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2);
OPC_DSTORE_n(0);
OPC_DSTORE_n(1);
OPC_DSTORE_n(2);
OPC_DSTORE_n(3);
/* stack pop, dup, and insert opcodes */
CASE(_pop): /* Discard the top item on the stack */
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
CASE(_pop2): /* Discard the top 2 items on the stack */
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2);
CASE(_dup): /* Duplicate the top item on the stack */
dup(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
CASE(_dup2): /* Duplicate the top 2 items on the stack */
dup2(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
CASE(_dup_x1): /* insert top word two down */
dup_x1(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
CASE(_dup_x2): /* insert top word three down */
dup_x2(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
CASE(_dup2_x1): /* insert top 2 slots three down */
dup2_x1(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
CASE(_dup2_x2): /* insert top 2 slots four down */
dup2_x2(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
CASE(_swap): { /* swap top two elements on the stack */
swap(topOfStack);
UPDATE_PC_AND_CONTINUE(1);
}
/* Perform various binary integer operations */
#undef OPC_INT_BINARY
#define OPC_INT_BINARY(opcname, opname, test) \
CASE(_i##opcname): \
if (test && (STACK_INT(-1) == 0)) { \
VM_JAVA_ERROR(vmSymbols::java_lang_ArithmeticException(), \
"/ by zero"); \
} \
SET_STACK_INT(VMint##opname(STACK_INT(-2), \
STACK_INT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
CASE(_l##opcname): \
{ \
if (test) { \
jlong l1 = STACK_LONG(-1); \
if (VMlongEqz(l1)) { \
VM_JAVA_ERROR(vmSymbols::java_lang_ArithmeticException(), \
"/ by long zero"); \
} \
} \
/* First long at (-1,-2) next long at (-3,-4) */ \
SET_STACK_LONG(VMlong##opname(STACK_LONG(-3), \
STACK_LONG(-1)), \
-3); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2); \
}
OPC_INT_BINARY(add, Add, 0);
OPC_INT_BINARY(sub, Sub, 0);
OPC_INT_BINARY(mul, Mul, 0);
OPC_INT_BINARY(and, And, 0);
OPC_INT_BINARY(or, Or, 0);
OPC_INT_BINARY(xor, Xor, 0);
OPC_INT_BINARY(div, Div, 1);
OPC_INT_BINARY(rem, Rem, 1);
/* Perform various binary floating number operations */
/* On some machine/platforms/compilers div zero check can be implicit */
#undef OPC_FLOAT_BINARY
#define OPC_FLOAT_BINARY(opcname, opname) \
CASE(_d##opcname): { \
SET_STACK_DOUBLE(VMdouble##opname(STACK_DOUBLE(-3), \
STACK_DOUBLE(-1)), \
-3); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2); \
} \
CASE(_f##opcname): \
SET_STACK_FLOAT(VMfloat##opname(STACK_FLOAT(-2), \
STACK_FLOAT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
OPC_FLOAT_BINARY(add, Add);
OPC_FLOAT_BINARY(sub, Sub);
OPC_FLOAT_BINARY(mul, Mul);
OPC_FLOAT_BINARY(div, Div);
OPC_FLOAT_BINARY(rem, Rem);
/* Shift operations
* Shift left int and long: ishl, lshl
* Logical shift right int and long w/zero extension: iushr, lushr
* Arithmetic shift right int and long w/sign extension: ishr, lshr
*/
#undef OPC_SHIFT_BINARY
#define OPC_SHIFT_BINARY(opcname, opname) \
CASE(_i##opcname): \
SET_STACK_INT(VMint##opname(STACK_INT(-2), \
STACK_INT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
CASE(_l##opcname): \
{ \
SET_STACK_LONG(VMlong##opname(STACK_LONG(-2), \
STACK_INT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
}
OPC_SHIFT_BINARY(shl, Shl);
OPC_SHIFT_BINARY(shr, Shr);
OPC_SHIFT_BINARY(ushr, Ushr);
/* Increment local variable by constant */
CASE(_iinc):
{
// locals[pc[1]].j.i += (jbyte)(pc[2]);
SET_LOCALS_INT(LOCALS_INT(pc[1]) + (jbyte)(pc[2]), pc[1]);
UPDATE_PC_AND_CONTINUE(3);
}
/* negate the value on the top of the stack */
CASE(_ineg):
SET_STACK_INT(VMintNeg(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_fneg):
SET_STACK_FLOAT(VMfloatNeg(STACK_FLOAT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_lneg):
{
SET_STACK_LONG(VMlongNeg(STACK_LONG(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
}
CASE(_dneg):
{
SET_STACK_DOUBLE(VMdoubleNeg(STACK_DOUBLE(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
}
/* Conversion operations */
CASE(_i2f): /* convert top of stack int to float */
SET_STACK_FLOAT(VMint2Float(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_i2l): /* convert top of stack int to long */
{
// this is ugly QQQ
jlong r = VMint2Long(STACK_INT(-1));
MORE_STACK(-1); // Pop
SET_STACK_LONG(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_i2d): /* convert top of stack int to double */
{
// this is ugly QQQ (why cast to jlong?? )
jdouble r = (jlong)STACK_INT(-1);
MORE_STACK(-1); // Pop
SET_STACK_DOUBLE(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_l2i): /* convert top of stack long to int */
{
jint r = VMlong2Int(STACK_LONG(-1));
MORE_STACK(-2); // Pop
SET_STACK_INT(r, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_l2f): /* convert top of stack long to float */
{
jlong r = STACK_LONG(-1);
MORE_STACK(-2); // Pop
SET_STACK_FLOAT(VMlong2Float(r), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_l2d): /* convert top of stack long to double */
{
jlong r = STACK_LONG(-1);
MORE_STACK(-2); // Pop
SET_STACK_DOUBLE(VMlong2Double(r), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_f2i): /* Convert top of stack float to int */
SET_STACK_INT(SharedRuntime::f2i(STACK_FLOAT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_f2l): /* convert top of stack float to long */
{
jlong r = SharedRuntime::f2l(STACK_FLOAT(-1));
MORE_STACK(-1); // POP
SET_STACK_LONG(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_f2d): /* convert top of stack float to double */
{
jfloat f;
jdouble r;
f = STACK_FLOAT(-1);
r = (jdouble) f;
MORE_STACK(-1); // POP
SET_STACK_DOUBLE(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_d2i): /* convert top of stack double to int */
{
jint r1 = SharedRuntime::d2i(STACK_DOUBLE(-1));
MORE_STACK(-2);
SET_STACK_INT(r1, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_d2f): /* convert top of stack double to float */
{
jfloat r1 = VMdouble2Float(STACK_DOUBLE(-1));
MORE_STACK(-2);
SET_STACK_FLOAT(r1, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_d2l): /* convert top of stack double to long */
{
jlong r1 = SharedRuntime::d2l(STACK_DOUBLE(-1));
MORE_STACK(-2);
SET_STACK_LONG(r1, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_i2b):
SET_STACK_INT(VMint2Byte(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_i2c):
SET_STACK_INT(VMint2Char(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_i2s):
SET_STACK_INT(VMint2Short(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
/* comparison operators */
#define COMPARISON_OP(name, comparison) \
CASE(_if_icmp##name): { \
int skip = (STACK_INT(-2) comparison STACK_INT(-1)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -2); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
} \
CASE(_if##name): { \
int skip = (STACK_INT(-1) comparison 0) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -1); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
#define COMPARISON_OP2(name, comparison) \
COMPARISON_OP(name, comparison) \
CASE(_if_acmp##name): { \
int skip = (STACK_OBJECT(-2) comparison STACK_OBJECT(-1)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -2); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
#define NULL_COMPARISON_NOT_OP(name) \
CASE(_if##name): { \
int skip = (!(STACK_OBJECT(-1) == nullptr)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -1); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
#define NULL_COMPARISON_OP(name) \
CASE(_if##name): { \
int skip = ((STACK_OBJECT(-1) == nullptr)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -1); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
COMPARISON_OP(lt, <);
COMPARISON_OP(gt, >);
COMPARISON_OP(le, <=);
COMPARISON_OP(ge, >=);
COMPARISON_OP2(eq, ==); /* include ref comparison */
COMPARISON_OP2(ne, !=); /* include ref comparison */
NULL_COMPARISON_OP(null);
NULL_COMPARISON_NOT_OP(nonnull);
/* Goto pc at specified offset in switch table. */
CASE(_tableswitch): {
jint* lpc = (jint*)VMalignWordUp(pc+1);
int32_t key = STACK_INT(-1);
int32_t low = Bytes::get_Java_u4((address)&lpc[1]);
int32_t high = Bytes::get_Java_u4((address)&lpc[2]);
int32_t skip;
key -= low;
if (((uint32_t) key > (uint32_t)(high - low))) {
skip = Bytes::get_Java_u4((address)&lpc[0]);
} else {
skip = Bytes::get_Java_u4((address)&lpc[key + 3]);
}
// Does this really need a full backedge check (osr)?
address branch_pc = pc;
UPDATE_PC_AND_TOS(skip, -1);
DO_BACKEDGE_CHECKS(skip, branch_pc);
CONTINUE;
}
/* Goto pc whose table entry matches specified key. */
CASE(_lookupswitch): {
jint* lpc = (jint*)VMalignWordUp(pc+1);
int32_t key = STACK_INT(-1);
int32_t skip = Bytes::get_Java_u4((address) lpc); /* default amount */
int32_t npairs = Bytes::get_Java_u4((address) &lpc[1]);
while (--npairs >= 0) {
lpc += 2;
if (key == (int32_t)Bytes::get_Java_u4((address)lpc)) {
skip = Bytes::get_Java_u4((address)&lpc[1]);
break;
}
}
address branch_pc = pc;
UPDATE_PC_AND_TOS(skip, -1);
DO_BACKEDGE_CHECKS(skip, branch_pc);
CONTINUE;
}
CASE(_fcmpl):
CASE(_fcmpg):
{
SET_STACK_INT(VMfloatCompare(STACK_FLOAT(-2),
STACK_FLOAT(-1),
(opcode == Bytecodes::_fcmpl ? -1 : 1)),
-2);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
}
CASE(_dcmpl):
CASE(_dcmpg):
{
int r = VMdoubleCompare(STACK_DOUBLE(-3),
STACK_DOUBLE(-1),
(opcode == Bytecodes::_dcmpl ? -1 : 1));
MORE_STACK(-4); // Pop
SET_STACK_INT(r, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_lcmp):
{
int r = VMlongCompare(STACK_LONG(-3), STACK_LONG(-1));
MORE_STACK(-4);
SET_STACK_INT(r, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
/* Return from a method */
CASE(_areturn):
CASE(_ireturn):
CASE(_freturn):
CASE(_lreturn):
CASE(_dreturn):
CASE(_return): {
// Allow a safepoint before returning to frame manager.
RETURN_SAFEPOINT;
goto handle_return;
}
CASE(_return_register_finalizer): {
oop rcvr = LOCALS_OBJECT(0);
VERIFY_OOP(rcvr);
if (rcvr->klass()->has_finalizer()) {
CALL_VM(InterpreterRuntime::register_finalizer(THREAD, rcvr), handle_exception);
}
goto handle_return;
}
/* Array access byte-codes */
#define ARRAY_INDEX_CHECK(arrObj, index) \
/* Two integers, the additional message, and the null-terminator */ \
char message[2 * jintAsStringSize + 33]; \
CHECK_NULL(arrObj); \
if ((uint32_t)index >= (uint32_t)arrObj->length()) { \
jio_snprintf(message, sizeof(message), \
"Index %d out of bounds for length %d", \
index, arrObj->length()); \
VM_JAVA_ERROR(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), \
message); \
}
/* Every array access byte-code starts out like this */
// arrayOopDesc* arrObj = (arrayOopDesc*)STACK_OBJECT(arrayOff);
#define ARRAY_INTRO(arrayOff) \
arrayOop arrObj = (arrayOop)STACK_OBJECT(arrayOff); \
jint index = STACK_INT(arrayOff + 1); \
ARRAY_INDEX_CHECK(arrObj, index)
/* 32-bit loads. These handle conversion from < 32-bit types */
#define ARRAY_LOADTO32(T, T2, format, stackRes, extra) \
{ \
ARRAY_INTRO(-2); \
(void)extra; \
SET_ ## stackRes(*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
}
/* 64-bit loads */
#define ARRAY_LOADTO64(T,T2, stackRes, extra) \
{ \
ARRAY_INTRO(-2); \
SET_ ## stackRes(*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)), -1); \
(void)extra; \
UPDATE_PC_AND_CONTINUE(1); \
}
CASE(_iaload):
ARRAY_LOADTO32(T_INT, jint, "%d", STACK_INT, 0);
CASE(_faload):
ARRAY_LOADTO32(T_FLOAT, jfloat, "%f", STACK_FLOAT, 0);
CASE(_aaload): {
ARRAY_INTRO(-2);
SET_STACK_OBJECT(((objArrayOop) arrObj)->obj_at(index), -2);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
}
CASE(_baload):
ARRAY_LOADTO32(T_BYTE, jbyte, "%d", STACK_INT, 0);
CASE(_caload):
ARRAY_LOADTO32(T_CHAR, jchar, "%d", STACK_INT, 0);
CASE(_saload):
ARRAY_LOADTO32(T_SHORT, jshort, "%d", STACK_INT, 0);
CASE(_laload):
ARRAY_LOADTO64(T_LONG, jlong, STACK_LONG, 0);
CASE(_daload):
ARRAY_LOADTO64(T_DOUBLE, jdouble, STACK_DOUBLE, 0);
CASE(_fast_icaload): {
// Custom fast access for iload,caload pair.
arrayOop arrObj = (arrayOop) STACK_OBJECT(-1);
jint index = LOCALS_INT(pc[1]);
ARRAY_INDEX_CHECK(arrObj, index);
SET_STACK_INT(*(jchar *)(((address) arrObj->base(T_CHAR)) + index * sizeof(jchar)), -1);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 0);
}
/* 32-bit stores. These handle conversion to < 32-bit types */
#define ARRAY_STOREFROM32(T, T2, format, stackSrc, extra) \
{ \
ARRAY_INTRO(-3); \
(void)extra; \
*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)) = stackSrc( -1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -3); \
}
/* 64-bit stores */
#define ARRAY_STOREFROM64(T, T2, stackSrc, extra) \
{ \
ARRAY_INTRO(-4); \
(void)extra; \
*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)) = stackSrc( -1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -4); \
}
CASE(_iastore):
ARRAY_STOREFROM32(T_INT, jint, "%d", STACK_INT, 0);
CASE(_fastore):
ARRAY_STOREFROM32(T_FLOAT, jfloat, "%f", STACK_FLOAT, 0);
/*
* This one looks different because of the assignability check
*/
CASE(_aastore): {
oop rhsObject = STACK_OBJECT(-1);
VERIFY_OOP(rhsObject);
ARRAY_INTRO( -3);
// arrObj, index are set
if (rhsObject != nullptr) {
/* Check assignability of rhsObject into arrObj */
Klass* rhsKlass = rhsObject->klass(); // EBX (subclass)
Klass* elemKlass = ObjArrayKlass::cast(arrObj->klass())->element_klass(); // superklass EAX
//
// Check for compatibility. This check must not GC!!
// Seems way more expensive now that we must dispatch
//
if (rhsKlass != elemKlass && !rhsKlass->is_subtype_of(elemKlass)) { // ebx->is...
VM_JAVA_ERROR(vmSymbols::java_lang_ArrayStoreException(), "");
}
}
((objArrayOop) arrObj)->obj_at_put(index, rhsObject);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -3);
}
CASE(_bastore): {
ARRAY_INTRO(-3);
int item = STACK_INT(-1);
// if it is a T_BOOLEAN array, mask the stored value to 0/1
if (arrObj->klass() == Universe::boolArrayKlass()) {
item &= 1;
} else {
assert(arrObj->klass() == Universe::byteArrayKlass(),
"should be byte array otherwise");
}
((typeArrayOop)arrObj)->byte_at_put(index, item);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -3);
}
CASE(_castore):
ARRAY_STOREFROM32(T_CHAR, jchar, "%d", STACK_INT, 0);
CASE(_sastore):
ARRAY_STOREFROM32(T_SHORT, jshort, "%d", STACK_INT, 0);
CASE(_lastore):
ARRAY_STOREFROM64(T_LONG, jlong, STACK_LONG, 0);
CASE(_dastore):
ARRAY_STOREFROM64(T_DOUBLE, jdouble, STACK_DOUBLE, 0);
CASE(_arraylength):
{
arrayOop ary = (arrayOop) STACK_OBJECT(-1);
CHECK_NULL(ary);
SET_STACK_INT(ary->length(), -1);
UPDATE_PC_AND_CONTINUE(1);
}
/* monitorenter and monitorexit for locking/unlocking an object */
CASE(_monitorenter): {
oop lockee = STACK_OBJECT(-1);
// derefing's lockee ought to provoke implicit null check
CHECK_NULL(lockee);
// find a free monitor or one already allocated for this object
// if we find a matching object then we need a new monitor
// since this is recursive enter
BasicObjectLock* limit = istate->monitor_base();
BasicObjectLock* most_recent = (BasicObjectLock*) istate->stack_base();
BasicObjectLock* entry = nullptr;
while (most_recent != limit ) {
if (most_recent->obj() == nullptr) entry = most_recent;
else if (most_recent->obj() == lockee) break;
most_recent++;
}
if (entry != nullptr) {
entry->set_obj(lockee);
CALL_VM(InterpreterRuntime::monitorenter(THREAD, entry), handle_exception);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
} else {
istate->set_msg(more_monitors);
UPDATE_PC_AND_RETURN(0); // Re-execute
}
}
CASE(_monitorexit): {
oop lockee = STACK_OBJECT(-1);
CHECK_NULL(lockee);
// derefing's lockee ought to provoke implicit null check
// find our monitor slot
BasicObjectLock* limit = istate->monitor_base();
BasicObjectLock* most_recent = (BasicObjectLock*) istate->stack_base();
while (most_recent != limit ) {
if ((most_recent)->obj() == lockee) {
BasicLock* lock = most_recent->lock();
InterpreterRuntime::monitorexit(most_recent);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
}
most_recent++;
}
// Need to throw illegal monitor state exception
CALL_VM(InterpreterRuntime::throw_illegal_monitor_state_exception(THREAD), handle_exception);
ShouldNotReachHere();
}
/* All of the non-quick opcodes. */
/* -Set clobbersCpIndex true if the quickened opcode clobbers the
* constant pool index in the instruction.
*/
CASE(_getfield):
CASE(_nofast_getfield):
CASE(_getstatic):
{
u2 index;
index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
// QQQ Need to make this as inlined as possible. Probably need to
// split all the bytecode cases out so c++ compiler has a chance
// for constant prop to fold everything possible away.
// Interpreter runtime does not expect "nofast" opcodes,
// prepare the vanilla opcode for it.
Bytecodes::Code code = (Bytecodes::Code)opcode;
if (code == Bytecodes::_nofast_getfield) {
code = Bytecodes::_getfield;
}
if (!entry->is_resolved(code)) {
CALL_VM(InterpreterRuntime::resolve_from_cache(THREAD, code),
handle_exception);
entry = cp->resolved_field_entry_at(index);
}
oop obj;
if ((Bytecodes::Code)opcode == Bytecodes::_getstatic) {
Klass* k = entry->field_holder();
obj = k->java_mirror();
MORE_STACK(1); // Assume single slot push
} else {
obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
// Check if we can rewrite non-volatile _getfield to one of the _fast_Xgetfield.
if (REWRITE_BYTECODES && !entry->is_volatile() &&
((Bytecodes::Code)opcode != Bytecodes::_nofast_getfield)) {
// Rewrite current BC to _fast_Xgetfield.
REWRITE_AT_PC(fast_get_type((TosState)(entry->tos_state())));
}
}
MAYBE_POST_FIELD_ACCESS(obj);
//
// Now store the result on the stack
//
TosState tos_type = (TosState)(entry->tos_state());
int field_offset = entry->field_offset();
if (entry->is_volatile()) {
if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
OrderAccess::fence();
}
switch (tos_type) {
case btos:
case ztos:
SET_STACK_INT(obj->byte_field_acquire(field_offset), -1);
break;
case ctos:
SET_STACK_INT(obj->char_field_acquire(field_offset), -1);
break;
case stos:
SET_STACK_INT(obj->short_field_acquire(field_offset), -1);
break;
case itos:
SET_STACK_INT(obj->int_field_acquire(field_offset), -1);
break;
case ftos:
SET_STACK_FLOAT(obj->float_field_acquire(field_offset), -1);
break;
case ltos:
SET_STACK_LONG(obj->long_field_acquire(field_offset), 0);
MORE_STACK(1);
break;
case dtos:
SET_STACK_DOUBLE(obj->double_field_acquire(field_offset), 0);
MORE_STACK(1);
break;
case atos: {
oop val = obj->obj_field_acquire(field_offset);
VERIFY_OOP(val);
SET_STACK_OBJECT(val, -1);
break;
}
default:
ShouldNotReachHere();
}
} else {
switch (tos_type) {
case btos:
case ztos:
SET_STACK_INT(obj->byte_field(field_offset), -1);
break;
case ctos:
SET_STACK_INT(obj->char_field(field_offset), -1);
break;
case stos:
SET_STACK_INT(obj->short_field(field_offset), -1);
break;
case itos:
SET_STACK_INT(obj->int_field(field_offset), -1);
break;
case ftos:
SET_STACK_FLOAT(obj->float_field(field_offset), -1);
break;
case ltos:
SET_STACK_LONG(obj->long_field(field_offset), 0);
MORE_STACK(1);
break;
case dtos:
SET_STACK_DOUBLE(obj->double_field(field_offset), 0);
MORE_STACK(1);
break;
case atos: {
oop val = obj->obj_field(field_offset);
VERIFY_OOP(val);
SET_STACK_OBJECT(val, -1);
break;
}
default:
ShouldNotReachHere();
}
}
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_putfield):
CASE(_nofast_putfield):
CASE(_putstatic):
{
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
// Interpreter runtime does not expect "nofast" opcodes,
// prepare the vanilla opcode for it.
Bytecodes::Code code = (Bytecodes::Code)opcode;
if (code == Bytecodes::_nofast_putfield) {
code = Bytecodes::_putfield;
}
if (!entry->is_resolved(code)) {
CALL_VM(InterpreterRuntime::resolve_from_cache(THREAD, code),
handle_exception);
entry = cp->resolved_field_entry_at(index);
}
// QQQ Need to make this as inlined as possible. Probably need to split all the bytecode cases
// out so c++ compiler has a chance for constant prop to fold everything possible away.
oop obj;
int count;
TosState tos_type = (TosState)(entry->tos_state());
count = -1;
if (tos_type == ltos || tos_type == dtos) {
--count;
}
if ((Bytecodes::Code)opcode == Bytecodes::_putstatic) {
Klass* k = entry->field_holder();
obj = k->java_mirror();
} else {
--count;
obj = STACK_OBJECT(count);
CHECK_NULL(obj);
// Check if we can rewrite non-volatile _putfield to one of the _fast_Xputfield.
if (REWRITE_BYTECODES && !entry->is_volatile() &&
((Bytecodes::Code)opcode != Bytecodes::_nofast_putfield)) {
// Rewrite current BC to _fast_Xputfield.
REWRITE_AT_PC(fast_put_type((TosState)(entry->tos_state())));
}
}
MAYBE_POST_FIELD_MODIFICATION(obj);
//
// Now store the result
//
int field_offset = entry->field_offset();
if (entry->is_volatile()) {
switch (tos_type) {
case ztos:
obj->release_byte_field_put(field_offset, (STACK_INT(-1) & 1)); // only store LSB
break;
case btos:
obj->release_byte_field_put(field_offset, STACK_INT(-1));
break;
case ctos:
obj->release_char_field_put(field_offset, STACK_INT(-1));
break;
case stos:
obj->release_short_field_put(field_offset, STACK_INT(-1));
break;
case itos:
obj->release_int_field_put(field_offset, STACK_INT(-1));
break;
case ftos:
obj->release_float_field_put(field_offset, STACK_FLOAT(-1));
break;
case ltos:
obj->release_long_field_put(field_offset, STACK_LONG(-1));
break;
case dtos:
obj->release_double_field_put(field_offset, STACK_DOUBLE(-1));
break;
case atos: {
oop val = STACK_OBJECT(-1);
VERIFY_OOP(val);
obj->release_obj_field_put(field_offset, val);
break;
}
default:
ShouldNotReachHere();
}
OrderAccess::storeload();
} else {
switch (tos_type) {
case ztos:
obj->byte_field_put(field_offset, (STACK_INT(-1) & 1)); // only store LSB
break;
case btos:
obj->byte_field_put(field_offset, STACK_INT(-1));
break;
case ctos:
obj->char_field_put(field_offset, STACK_INT(-1));
break;
case stos:
obj->short_field_put(field_offset, STACK_INT(-1));
break;
case itos:
obj->int_field_put(field_offset, STACK_INT(-1));
break;
case ftos:
obj->float_field_put(field_offset, STACK_FLOAT(-1));
break;
case ltos:
obj->long_field_put(field_offset, STACK_LONG(-1));
break;
case dtos:
obj->double_field_put(field_offset, STACK_DOUBLE(-1));
break;
case atos: {
oop val = STACK_OBJECT(-1);
VERIFY_OOP(val);
obj->obj_field_put(field_offset, val);
break;
}
default:
ShouldNotReachHere();
}
}
UPDATE_PC_AND_TOS_AND_CONTINUE(3, count);
}
CASE(_new): {
u2 index = Bytes::get_Java_u2(pc+1);
// Attempt TLAB allocation first.
//
// To do this, we need to make sure:
// - klass is initialized
// - klass can be fastpath allocated (e.g. does not have finalizer)
// - TLAB accepts the allocation
ConstantPool* constants = istate->method()->constants();
if (UseTLAB && !constants->tag_at(index).is_unresolved_klass()) {
Klass* entry = constants->resolved_klass_at(index);
InstanceKlass* ik = InstanceKlass::cast(entry);
if (ik->is_initialized() && ik->can_be_fastpath_allocated()) {
size_t obj_size = ik->size_helper();
HeapWord* result = THREAD->tlab().allocate(obj_size);
if (result != nullptr) {
// Initialize object field block.
if (!ZeroTLAB) {
// The TLAB was not pre-zeroed, we need to clear the memory here.
size_t hdr_size = oopDesc::header_size();
Copy::fill_to_words(result + hdr_size, obj_size - hdr_size, 0);
}
// Initialize header, mirrors MemAllocator.
if (UseCompactObjectHeaders) {
oopDesc::release_set_mark(result, ik->prototype_header());
} else {
oopDesc::set_mark(result, markWord::prototype());
if (oopDesc::has_klass_gap()) {
oopDesc::set_klass_gap(result, 0);
}
oopDesc::release_set_klass(result, ik);
}
oop obj = cast_to_oop(result);
// Must prevent reordering of stores for object initialization
// with stores that publish the new object.
OrderAccess::storestore();
SET_STACK_OBJECT(obj, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 1);
}
}
}
// Slow case allocation
CALL_VM(InterpreterRuntime::_new(THREAD, METHOD->constants(), index),
handle_exception);
// Must prevent reordering of stores for object initialization
// with stores that publish the new object.
OrderAccess::storestore();
SET_STACK_OBJECT(THREAD->vm_result_oop(), 0);
THREAD->set_vm_result_oop(nullptr);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 1);
}
CASE(_anewarray): {
u2 index = Bytes::get_Java_u2(pc+1);
jint size = STACK_INT(-1);
CALL_VM(InterpreterRuntime::anewarray(THREAD, METHOD->constants(), index, size),
handle_exception);
// Must prevent reordering of stores for object initialization
// with stores that publish the new object.
OrderAccess::storestore();
SET_STACK_OBJECT(THREAD->vm_result_oop(), -1);
THREAD->set_vm_result_oop(nullptr);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_multianewarray): {
jint dims = *(pc+3);
jint size = STACK_INT(-1);
// stack grows down, dimensions are up!
jint *dimarray =
(jint*)&topOfStack[dims * Interpreter::stackElementWords+
Interpreter::stackElementWords-1];
//adjust pointer to start of stack element
CALL_VM(InterpreterRuntime::multianewarray(THREAD, dimarray),
handle_exception);
// Must prevent reordering of stores for object initialization
// with stores that publish the new object.
OrderAccess::storestore();
SET_STACK_OBJECT(THREAD->vm_result_oop(), -dims);
THREAD->set_vm_result_oop(nullptr);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -(dims-1));
}
CASE(_checkcast):
if (STACK_OBJECT(-1) != nullptr) {
VERIFY_OOP(STACK_OBJECT(-1));
u2 index = Bytes::get_Java_u2(pc+1);
// Constant pool may have actual klass or unresolved klass. If it is
// unresolved we must resolve it.
if (METHOD->constants()->tag_at(index).is_unresolved_klass()) {
CALL_VM(InterpreterRuntime::quicken_io_cc(THREAD), handle_exception);
}
Klass* klassOf = (Klass*) METHOD->constants()->resolved_klass_at(index);
Klass* objKlass = STACK_OBJECT(-1)->klass(); // ebx
//
// Check for compatibility. This check must not GC!!
// Seems way more expensive now that we must dispatch.
//
if (objKlass != klassOf && !objKlass->is_subtype_of(klassOf)) {
ResourceMark rm(THREAD);
char* message = SharedRuntime::generate_class_cast_message(
objKlass, klassOf);
VM_JAVA_ERROR(vmSymbols::java_lang_ClassCastException(), message);
}
}
UPDATE_PC_AND_CONTINUE(3);
CASE(_instanceof):
if (STACK_OBJECT(-1) == nullptr) {
SET_STACK_INT(0, -1);
} else {
VERIFY_OOP(STACK_OBJECT(-1));
u2 index = Bytes::get_Java_u2(pc+1);
// Constant pool may have actual klass or unresolved klass. If it is
// unresolved we must resolve it.
if (METHOD->constants()->tag_at(index).is_unresolved_klass()) {
CALL_VM(InterpreterRuntime::quicken_io_cc(THREAD), handle_exception);
}
Klass* klassOf = (Klass*) METHOD->constants()->resolved_klass_at(index);
Klass* objKlass = STACK_OBJECT(-1)->klass();
//
// Check for compatibility. This check must not GC!!
// Seems way more expensive now that we must dispatch.
//
if ( objKlass == klassOf || objKlass->is_subtype_of(klassOf)) {
SET_STACK_INT(1, -1);
} else {
SET_STACK_INT(0, -1);
}
}
UPDATE_PC_AND_CONTINUE(3);
CASE(_ldc_w):
CASE(_ldc):
{
u2 index;
bool wide = false;
int incr = 2; // frequent case
if (opcode == Bytecodes::_ldc) {
index = pc[1];
} else {
index = Bytes::get_Java_u2(pc+1);
incr = 3;
wide = true;
}
ConstantPool* constants = METHOD->constants();
switch (constants->tag_at(index).value()) {
case JVM_CONSTANT_Integer:
SET_STACK_INT(constants->int_at(index), 0);
break;
case JVM_CONSTANT_Float:
SET_STACK_FLOAT(constants->float_at(index), 0);
break;
case JVM_CONSTANT_String:
{
oop result = constants->resolved_reference_at(index);
if (result == nullptr) {
CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
SET_STACK_OBJECT(THREAD->vm_result_oop(), 0);
THREAD->set_vm_result_oop(nullptr);
} else {
VERIFY_OOP(result);
SET_STACK_OBJECT(result, 0);
}
break;
}
case JVM_CONSTANT_Class:
VERIFY_OOP(constants->resolved_klass_at(index)->java_mirror());
SET_STACK_OBJECT(constants->resolved_klass_at(index)->java_mirror(), 0);
break;
case JVM_CONSTANT_UnresolvedClass:
case JVM_CONSTANT_UnresolvedClassInError:
CALL_VM(InterpreterRuntime::ldc(THREAD, wide), handle_exception);
SET_STACK_OBJECT(THREAD->vm_result_oop(), 0);
THREAD->set_vm_result_oop(nullptr);
break;
case JVM_CONSTANT_Dynamic:
case JVM_CONSTANT_DynamicInError:
{
CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
oop result = THREAD->vm_result_oop();
VERIFY_OOP(result);
jvalue value;
BasicType type = java_lang_boxing_object::get_value(result, &value);
switch (type) {
case T_FLOAT: SET_STACK_FLOAT(value.f, 0); break;
case T_INT: SET_STACK_INT(value.i, 0); break;
case T_SHORT: SET_STACK_INT(value.s, 0); break;
case T_BYTE: SET_STACK_INT(value.b, 0); break;
case T_CHAR: SET_STACK_INT(value.c, 0); break;
case T_BOOLEAN: SET_STACK_INT(value.z, 0); break;
default: ShouldNotReachHere();
}
break;
}
default: ShouldNotReachHere();
}
UPDATE_PC_AND_TOS_AND_CONTINUE(incr, 1);
}
CASE(_ldc2_w):
{
u2 index = Bytes::get_Java_u2(pc+1);
ConstantPool* constants = METHOD->constants();
switch (constants->tag_at(index).value()) {
case JVM_CONSTANT_Long:
SET_STACK_LONG(constants->long_at(index), 1);
break;
case JVM_CONSTANT_Double:
SET_STACK_DOUBLE(constants->double_at(index), 1);
break;
case JVM_CONSTANT_Dynamic:
case JVM_CONSTANT_DynamicInError:
{
CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
oop result = THREAD->vm_result_oop();
VERIFY_OOP(result);
jvalue value;
BasicType type = java_lang_boxing_object::get_value(result, &value);
switch (type) {
case T_DOUBLE: SET_STACK_DOUBLE(value.d, 1); break;
case T_LONG: SET_STACK_LONG(value.j, 1); break;
default: ShouldNotReachHere();
}
break;
}
default: ShouldNotReachHere();
}
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 2);
}
CASE(_fast_aldc_w):
CASE(_fast_aldc): {
u2 index;
int incr;
if (opcode == Bytecodes::_fast_aldc) {
index = pc[1];
incr = 2;
} else {
index = Bytes::get_native_u2(pc+1);
incr = 3;
}
// We are resolved if the resolved_references array contains a non-null object (CallSite, etc.)
// This kind of CP cache entry does not need to match the flags byte, because
// there is a 1-1 relation between bytecode type and CP entry type.
ConstantPool* constants = METHOD->constants();
oop result = constants->resolved_reference_at(index);
if (result == nullptr) {
CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode),
handle_exception);
result = THREAD->vm_result_oop();
}
if (result == Universe::the_null_sentinel())
result = nullptr;
VERIFY_OOP(result);
SET_STACK_OBJECT(result, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(incr, 1);
}
CASE(_invokedynamic): {
u4 index = Bytes::get_native_u4(pc+1);
ResolvedIndyEntry* indy_info = cp->resolved_indy_entry_at(index);
if (!indy_info->is_resolved()) {
CALL_VM(InterpreterRuntime::resolve_from_cache(THREAD, (Bytecodes::Code)opcode),
handle_exception);
indy_info = cp->resolved_indy_entry_at(index); // get resolved entry
}
Method* method = indy_info->method();
if (VerifyOops) method->verify();
if (indy_info->has_appendix()) {
constantPoolHandle cp(THREAD, METHOD->constants());
SET_STACK_OBJECT(cp->resolved_reference_from_indy(index), 0);
MORE_STACK(1);
}
istate->set_msg(call_method);
istate->set_callee(method);
istate->set_callee_entry_point(method->from_interpreted_entry());
istate->set_bcp_advance(5);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
CASE(_invokehandle): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedMethodEntry* entry = cp->resolved_method_entry_at(index);
if (! entry->is_resolved((Bytecodes::Code) opcode)) {
CALL_VM(InterpreterRuntime::resolve_from_cache(THREAD, (Bytecodes::Code)opcode),
handle_exception);
entry = cp->resolved_method_entry_at(index);
}
Method* method = entry->method();
if (VerifyOops) method->verify();
if (entry->has_appendix()) {
constantPoolHandle cp(THREAD, METHOD->constants());
SET_STACK_OBJECT(cp->cache()->appendix_if_resolved(entry), 0);
MORE_STACK(1);
}
istate->set_msg(call_method);
istate->set_callee(method);
istate->set_callee_entry_point(method->from_interpreted_entry());
istate->set_bcp_advance(3);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
CASE(_invokeinterface): {
u2 index = Bytes::get_native_u2(pc+1);
// QQQ Need to make this as inlined as possible. Probably need to split all the bytecode cases
// out so c++ compiler has a chance for constant prop to fold everything possible away.
ResolvedMethodEntry* entry = cp->resolved_method_entry_at(index);
if (!entry->is_resolved((Bytecodes::Code)opcode)) {
CALL_VM(InterpreterRuntime::resolve_from_cache(THREAD, (Bytecodes::Code)opcode),
handle_exception);
}
istate->set_msg(call_method);
// Special case of invokeinterface called for virtual method of
// java.lang.Object. See cpCache.cpp for details.
Method* callee = nullptr;
if (entry->is_forced_virtual()) {
CHECK_NULL(STACK_OBJECT(-(entry->number_of_parameters())));
if (entry->is_vfinal()) {
callee = entry->method();
} else {
// Get receiver.
int parms = entry->number_of_parameters();
// Same comments as invokevirtual apply here.
oop rcvr = STACK_OBJECT(-parms);
VERIFY_OOP(rcvr);
Klass* rcvrKlass = rcvr->klass();
callee = (Method*) rcvrKlass->method_at_vtable(entry->table_index());
}
} else if (entry->is_vfinal()) {
// private interface method invocations
//
// Ensure receiver class actually implements
// the resolved interface class. The link resolver
// does this, but only for the first time this
// interface is being called.
int parms = entry->number_of_parameters();
oop rcvr = STACK_OBJECT(-parms);
CHECK_NULL(rcvr);
Klass* recv_klass = rcvr->klass();
Klass* resolved_klass = entry->interface_klass();
if (!recv_klass->is_subtype_of(resolved_klass)) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
recv_klass->external_name(),
resolved_klass->external_name());
VM_JAVA_ERROR(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
callee = entry->method();
}
if (callee != nullptr) {
istate->set_callee(callee);
istate->set_callee_entry_point(callee->from_interpreted_entry());
if (JVMTI_ENABLED && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
}
istate->set_bcp_advance(5);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
// this could definitely be cleaned up QQQ
Method *interface_method = entry->method();
InstanceKlass* iclass = interface_method->method_holder();
// get receiver
int parms = entry->number_of_parameters();
oop rcvr = STACK_OBJECT(-parms);
CHECK_NULL(rcvr);
InstanceKlass* int2 = (InstanceKlass*) rcvr->klass();
// Receiver subtype check against resolved interface klass (REFC).
{
Klass* refc = entry->interface_klass();
itableOffsetEntry* scan;
for (scan = (itableOffsetEntry*) int2->start_of_itable();
scan->interface_klass() != nullptr;
scan++) {
if (scan->interface_klass() == refc) {
break;
}
}
// Check that the entry is non-null. A null entry means
// that the receiver class doesn't implement the
// interface, and wasn't the same as when the caller was
// compiled.
if (scan->interface_klass() == nullptr) {
VM_JAVA_ERROR(vmSymbols::java_lang_IncompatibleClassChangeError(), "");
}
}
itableOffsetEntry* ki = (itableOffsetEntry*) int2->start_of_itable();
int i;
for ( i = 0 ; i < int2->itable_length() ; i++, ki++ ) {
if (ki->interface_klass() == iclass) break;
}
// If the interface isn't found, this class doesn't implement this
// interface. The link resolver checks this but only for the first
// time this interface is called.
if (i == int2->itable_length()) {
CALL_VM(InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(THREAD, rcvr->klass(), iclass),
handle_exception);
}
int mindex = interface_method->itable_index();
itableMethodEntry* im = ki->first_method_entry(rcvr->klass());
callee = im[mindex].method();
if (callee == nullptr) {
CALL_VM(InterpreterRuntime::throw_AbstractMethodErrorVerbose(THREAD, rcvr->klass(), interface_method),
handle_exception);
}
istate->set_callee(callee);
istate->set_callee_entry_point(callee->from_interpreted_entry());
if (JVMTI_ENABLED && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
}
istate->set_bcp_advance(5);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
CASE(_invokevirtual):
CASE(_invokespecial):
CASE(_invokestatic): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedMethodEntry* entry = cp->resolved_method_entry_at(index);
// QQQ Need to make this as inlined as possible. Probably need to split all the bytecode cases
// out so c++ compiler has a chance for constant prop to fold everything possible away.
if (!entry->is_resolved((Bytecodes::Code)opcode)) {
CALL_VM(InterpreterRuntime::resolve_from_cache(THREAD, (Bytecodes::Code)opcode),
handle_exception);
entry = cp->resolved_method_entry_at(index);
}
istate->set_msg(call_method);
{
Method* callee;
if ((Bytecodes::Code)opcode == Bytecodes::_invokevirtual) {
CHECK_NULL(STACK_OBJECT(-(entry->number_of_parameters())));
if (entry->is_vfinal()) {
callee = entry->method();
if (REWRITE_BYTECODES && !CDSConfig::is_using_archive() && !CDSConfig::is_dumping_archive()) {
// Rewrite to _fast_invokevfinal.
REWRITE_AT_PC(Bytecodes::_fast_invokevfinal);
}
} else {
// get receiver
int parms = entry->number_of_parameters();
// this works but needs a resourcemark and seems to create a vtable on every call:
// Method* callee = rcvr->klass()->vtable()->method_at(cache->f2_as_index());
//
// this fails with an assert
// InstanceKlass* rcvrKlass = InstanceKlass::cast(STACK_OBJECT(-parms)->klass());
// but this works
oop rcvr = STACK_OBJECT(-parms);
VERIFY_OOP(rcvr);
Klass* rcvrKlass = rcvr->klass();
/*
Executing this code in java.lang.String:
public String(char value[]) {
this.count = value.length;
this.value = (char[])value.clone();
}
a find on rcvr->klass() reports:
{type array char}{type array class}
- klass: {other class}
but using InstanceKlass::cast(STACK_OBJECT(-parms)->klass()) causes in assertion failure
because rcvr->klass()->is_instance_klass() == 0
However it seems to have a vtable in the right location. Huh?
Because vtables have the same offset for ArrayKlass and InstanceKlass.
*/
callee = (Method*) rcvrKlass->method_at_vtable(entry->table_index());
}
} else {
if ((Bytecodes::Code)opcode == Bytecodes::_invokespecial) {
CHECK_NULL(STACK_OBJECT(-(entry->number_of_parameters())));
}
callee = entry->method();
}
istate->set_callee(callee);
istate->set_callee_entry_point(callee->from_interpreted_entry());
if (JVMTI_ENABLED && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
}
istate->set_bcp_advance(3);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
}
/* Allocate memory for a new java object. */
CASE(_newarray): {
BasicType atype = (BasicType) *(pc+1);
jint size = STACK_INT(-1);
CALL_VM(InterpreterRuntime::newarray(THREAD, atype, size),
handle_exception);
// Must prevent reordering of stores for object initialization
// with stores that publish the new object.
OrderAccess::storestore();
SET_STACK_OBJECT(THREAD->vm_result_oop(), -1);
THREAD->set_vm_result_oop(nullptr);
UPDATE_PC_AND_CONTINUE(2);
}
/* Throw an exception. */
CASE(_athrow): {
oop except_oop = STACK_OBJECT(-1);
CHECK_NULL(except_oop);
// set pending_exception so we use common code
THREAD->set_pending_exception(except_oop, nullptr, 0);
goto handle_exception;
}
/* goto and jsr. They are exactly the same except jsr pushes
* the address of the next instruction first.
*/
CASE(_jsr): {
/* push bytecode index on stack */
SET_STACK_ADDR(((address)pc - (intptr_t)(istate->method()->code_base()) + 3), 0);
MORE_STACK(1);
/* FALL THROUGH */
}
CASE(_goto):
{
int16_t offset = (int16_t)Bytes::get_Java_u2(pc + 1);
address branch_pc = pc;
UPDATE_PC(offset);
DO_BACKEDGE_CHECKS(offset, branch_pc);
CONTINUE;
}
CASE(_jsr_w): {
/* push return address on the stack */
SET_STACK_ADDR(((address)pc - (intptr_t)(istate->method()->code_base()) + 5), 0);
MORE_STACK(1);
/* FALL THROUGH */
}
CASE(_goto_w):
{
int32_t offset = Bytes::get_Java_u4(pc + 1);
address branch_pc = pc;
UPDATE_PC(offset);
DO_BACKEDGE_CHECKS(offset, branch_pc);
CONTINUE;
}
/* return from a jsr or jsr_w */
CASE(_ret): {
pc = istate->method()->code_base() + (intptr_t)(LOCALS_ADDR(pc[1]));
UPDATE_PC_AND_CONTINUE(0);
}
/* debugger breakpoint */
CASE(_breakpoint): {
Bytecodes::Code original_bytecode;
DECACHE_STATE();
SET_LAST_JAVA_FRAME();
original_bytecode = InterpreterRuntime::get_original_bytecode_at(THREAD,
METHOD, pc);
RESET_LAST_JAVA_FRAME();
CACHE_STATE();
if (THREAD->has_pending_exception()) goto handle_exception;
CALL_VM(InterpreterRuntime::_breakpoint(THREAD, METHOD, pc),
handle_exception);
opcode = (jubyte)original_bytecode;
goto opcode_switch;
}
CASE(_fast_agetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
VERIFY_OOP(obj->obj_field(field_offset));
SET_STACK_OBJECT(obj->obj_field(field_offset), -1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_bgetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_INT(obj->byte_field(field_offset), -1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_cgetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_INT(obj->char_field(field_offset), -1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_dgetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_DOUBLE(obj->double_field(field_offset), 0);
MORE_STACK(1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_fgetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_FLOAT(obj->float_field(field_offset), -1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_igetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_INT(obj->int_field(field_offset), -1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_lgetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_LONG(obj->long_field(field_offset), 0);
MORE_STACK(1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_sgetfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = STACK_OBJECT(-1);
CHECK_NULL(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_INT(obj->short_field(field_offset), -1);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_fast_aputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->obj_field_put(field_offset, STACK_OBJECT(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_bputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->byte_field_put(field_offset, STACK_INT(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_zputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->byte_field_put(field_offset, (STACK_INT(-1) & 1)); // only store LSB
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_cputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->char_field_put(field_offset, STACK_INT(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_dputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-3);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->double_field_put(field_offset, STACK_DOUBLE(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -3);
}
CASE(_fast_fputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->float_field_put(field_offset, STACK_FLOAT(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_iputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->int_field_put(field_offset, STACK_INT(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_lputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-3);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->long_field_put(field_offset, STACK_LONG(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -3);
}
CASE(_fast_sputfield): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
oop obj = STACK_OBJECT(-2);
CHECK_NULL(obj);
MAYBE_POST_FIELD_MODIFICATION(obj);
int field_offset = entry->field_offset();
obj->short_field_put(field_offset, STACK_INT(-1));
UPDATE_PC_AND_TOS_AND_CONTINUE(3, -2);
}
CASE(_fast_aload_0): {
oop obj = LOCALS_OBJECT(0);
VERIFY_OOP(obj);
SET_STACK_OBJECT(obj, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_fast_aaccess_0): {
u2 index = Bytes::get_native_u2(pc+2);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = LOCALS_OBJECT(0);
CHECK_NULL(obj);
VERIFY_OOP(obj);
MAYBE_POST_FIELD_ACCESS(obj);
VERIFY_OOP(obj->obj_field(field_offset));
SET_STACK_OBJECT(obj->obj_field(field_offset), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
}
CASE(_fast_iaccess_0): {
u2 index = Bytes::get_native_u2(pc+2);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = LOCALS_OBJECT(0);
CHECK_NULL(obj);
VERIFY_OOP(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_INT(obj->int_field(field_offset), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
}
CASE(_fast_faccess_0): {
u2 index = Bytes::get_native_u2(pc+2);
ResolvedFieldEntry* entry = cp->resolved_field_entry_at(index);
int field_offset = entry->field_offset();
oop obj = LOCALS_OBJECT(0);
CHECK_NULL(obj);
VERIFY_OOP(obj);
MAYBE_POST_FIELD_ACCESS(obj);
SET_STACK_FLOAT(obj->float_field(field_offset), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
}
CASE(_fast_invokevfinal): {
u2 index = Bytes::get_native_u2(pc+1);
ResolvedMethodEntry* entry = cp->resolved_method_entry_at(index);
assert(entry->is_resolved(Bytecodes::_invokevirtual), "Should be resolved before rewriting");
istate->set_msg(call_method);
CHECK_NULL(STACK_OBJECT(-(entry->number_of_parameters())));
Method* callee = entry->method();
istate->set_callee(callee);
if (JVMTI_ENABLED && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
} else {
istate->set_callee_entry_point(callee->from_interpreted_entry());
}
istate->set_bcp_advance(3);
UPDATE_PC_AND_RETURN(0);
}
DEFAULT:
fatal("Unimplemented opcode %d = %s", opcode,
Bytecodes::name((Bytecodes::Code)opcode));
goto finish;
} /* switch(opc) */
#ifdef USELABELS
check_for_exception:
#endif
{
if (!THREAD->has_pending_exception()) {
CONTINUE;
}
/* We will be gcsafe soon, so flush our state. */
DECACHE_PC();
goto handle_exception;
}
do_continue: ;
} /* while (1) interpreter loop */
// An exception exists in the thread state see whether this activation can handle it
handle_exception: {
HandleMarkCleaner __hmc(THREAD);
Handle except_oop(THREAD, THREAD->pending_exception());
// Prevent any subsequent HandleMarkCleaner in the VM
// from freeing the except_oop handle.
HandleMark __hm(THREAD);
THREAD->clear_pending_exception();
assert(except_oop() != nullptr, "No exception to process");
intptr_t continuation_bci;
// expression stack is emptied
topOfStack = istate->stack_base() - Interpreter::stackElementWords;
CALL_VM(continuation_bci = (intptr_t)InterpreterRuntime::exception_handler_for_exception(THREAD, except_oop()),
handle_exception);
except_oop = Handle(THREAD, THREAD->vm_result_oop());
THREAD->set_vm_result_oop(nullptr);
if (continuation_bci >= 0) {
// Place exception on top of stack
SET_STACK_OBJECT(except_oop(), 0);
MORE_STACK(1);
pc = METHOD->code_base() + continuation_bci;
if (log_is_enabled(Info, exceptions)) {
ResourceMark rm(THREAD);
stringStream tempst;
tempst.print("interpreter method <%s>\n"
" at bci %d, continuing at %d for thread " INTPTR_FORMAT,
METHOD->print_value_string(),
(int)(istate->bcp() - METHOD->code_base()),
(int)continuation_bci, p2i(THREAD));
Exceptions::log_exception(except_oop, tempst.as_string());
}
// for AbortVMOnException flag
Exceptions::debug_check_abort(except_oop);
goto run;
}
if (log_is_enabled(Info, exceptions)) {
ResourceMark rm;
stringStream tempst;
tempst.print("interpreter method <%s>\n"
" at bci %d, unwinding for thread " INTPTR_FORMAT,
METHOD->print_value_string(),
(int)(istate->bcp() - METHOD->code_base()),
p2i(THREAD));
Exceptions::log_exception(except_oop, tempst.as_string());
}
// for AbortVMOnException flag
Exceptions::debug_check_abort(except_oop);
// No handler in this activation, unwind and try again
THREAD->set_pending_exception(except_oop(), nullptr, 0);
goto handle_return;
} // handle_exception:
// Return from an interpreter invocation with the result of the interpretation
// on the top of the Java Stack (or a pending exception)
handle_Pop_Frame: {
// We don't really do anything special here except we must be aware
// that we can get here without ever locking the method (if sync).
// Also we skip the notification of the exit.
istate->set_msg(popping_frame);
// Clear pending so while the pop is in process
// we don't start another one if a call_vm is done.
THREAD->clear_popframe_condition();
// Let interpreter (only) see the we're in the process of popping a frame
THREAD->set_pop_frame_in_process();
goto handle_return;
} // handle_Pop_Frame
// ForceEarlyReturn ends a method, and returns to the caller with a return value
// given by the invoker of the early return.
handle_Early_Return: {
istate->set_msg(early_return);
// Clear expression stack.
topOfStack = istate->stack_base() - Interpreter::stackElementWords;
JvmtiThreadState *ts = THREAD->jvmti_thread_state();
// Push the value to be returned.
switch (istate->method()->result_type()) {
case T_BOOLEAN:
case T_SHORT:
case T_BYTE:
case T_CHAR:
case T_INT:
SET_STACK_INT(ts->earlyret_value().i, 0);
MORE_STACK(1);
break;
case T_LONG:
SET_STACK_LONG(ts->earlyret_value().j, 1);
MORE_STACK(2);
break;
case T_FLOAT:
SET_STACK_FLOAT(ts->earlyret_value().f, 0);
MORE_STACK(1);
break;
case T_DOUBLE:
SET_STACK_DOUBLE(ts->earlyret_value().d, 1);
MORE_STACK(2);
break;
case T_ARRAY:
case T_OBJECT:
SET_STACK_OBJECT(ts->earlyret_oop(), 0);
MORE_STACK(1);
break;
default:
ShouldNotReachHere();
}
ts->clr_earlyret_value();
ts->set_earlyret_oop(nullptr);
ts->clr_earlyret_pending();
// Fall through to handle_return.
} // handle_Early_Return
handle_return: {
// A storestore barrier is required to order initialization of
// final fields with publishing the reference to the object that
// holds the field. Without the barrier the value of final fields
// can be observed to change.
OrderAccess::storestore();
DECACHE_STATE();
bool suppress_error = istate->msg() == popping_frame || istate->msg() == early_return;
bool suppress_exit_event = THREAD->has_pending_exception() || istate->msg() == popping_frame;
Handle original_exception(THREAD, THREAD->pending_exception());
Handle illegal_state_oop(THREAD, nullptr);
// We'd like a HandleMark here to prevent any subsequent HandleMarkCleaner
// in any following VM entries from freeing our live handles, but illegal_state_oop
// isn't really allocated yet and so doesn't become live until later and
// in unpredictable places. Instead we must protect the places where we enter the
// VM. It would be much simpler (and safer) if we could allocate a real handle with
// a null oop in it and then overwrite the oop later as needed. This isn't
// unfortunately isn't possible.
if (THREAD->has_pending_exception()) {
THREAD->clear_pending_exception();
}
//
// As far as we are concerned we have returned. If we have a pending exception
// that will be returned as this invocation's result. However if we get any
// exception(s) while checking monitor state one of those IllegalMonitorStateExceptions
// will be our final result (i.e. monitor exception trumps a pending exception).
//
// If we never locked the method (or really passed the point where we would have),
// there is no need to unlock it (or look for other monitors), since that
// could not have happened.
if (THREAD->do_not_unlock_if_synchronized()) {
// Never locked, reset the flag now because obviously any caller must
// have passed their point of locking for us to have gotten here.
THREAD->set_do_not_unlock_if_synchronized(false);
} else {
// At this point we consider that we have returned. We now check that the
// locks were properly block structured. If we find that they were not
// used properly we will return with an illegal monitor exception.
// The exception is checked by the caller not the callee since this
// checking is considered to be part of the invocation and therefore
// in the callers scope (JVM spec 8.13).
//
// Another weird thing to watch for is if the method was locked
// recursively and then not exited properly. This means we must
// examine all the entries in reverse time(and stack) order and
// unlock as we find them. If we find the method monitor before
// we are at the initial entry then we should throw an exception.
// It is not clear the template based interpreter does this
// correctly
BasicObjectLock* base = istate->monitor_base();
BasicObjectLock* end = (BasicObjectLock*) istate->stack_base();
bool method_unlock_needed = METHOD->is_synchronized();
// We know the initial monitor was used for the method don't check that
// slot in the loop
if (method_unlock_needed) base--;
// Check all the monitors to see they are unlocked. Install exception if found to be locked.
while (end < base) {
oop lockee = end->obj();
if (lockee != nullptr) {
InterpreterRuntime::monitorexit(end);
// One error is plenty
if (illegal_state_oop() == nullptr && !suppress_error) {
{
// Prevent any HandleMarkCleaner from freeing our live handles
HandleMark __hm(THREAD);
CALL_VM_NOCHECK(InterpreterRuntime::throw_illegal_monitor_state_exception(THREAD));
}
assert(THREAD->has_pending_exception(), "Lost our exception!");
illegal_state_oop = Handle(THREAD, THREAD->pending_exception());
THREAD->clear_pending_exception();
}
}
end++;
}
// Unlock the method if needed
if (method_unlock_needed) {
if (base->obj() == nullptr) {
// The method is already unlocked this is not good.
if (illegal_state_oop() == nullptr && !suppress_error) {
{
// Prevent any HandleMarkCleaner from freeing our live handles
HandleMark __hm(THREAD);
CALL_VM_NOCHECK(InterpreterRuntime::throw_illegal_monitor_state_exception(THREAD));
}
assert(THREAD->has_pending_exception(), "Lost our exception!");
illegal_state_oop = Handle(THREAD, THREAD->pending_exception());
THREAD->clear_pending_exception();
}
} else {
//
// The initial monitor is always used for the method
// However if that slot is no longer the oop for the method it was unlocked
// and reused by something that wasn't unlocked!
//
// deopt can come in with rcvr dead because c2 knows
// its value is preserved in the monitor. So we can't use locals[0] at all
// and must use first monitor slot.
//
oop rcvr = base->obj();
if (rcvr == nullptr) {
if (!suppress_error) {
VM_JAVA_ERROR_NO_JUMP(vmSymbols::java_lang_NullPointerException(), "");
illegal_state_oop = Handle(THREAD, THREAD->pending_exception());
THREAD->clear_pending_exception();
}
} else {
InterpreterRuntime::monitorexit(base);
if (THREAD->has_pending_exception()) {
if (!suppress_error) illegal_state_oop = Handle(THREAD, THREAD->pending_exception());
THREAD->clear_pending_exception();
}
}
}
}
}
// Clear the do_not_unlock flag now.
THREAD->set_do_not_unlock_if_synchronized(false);
//
// Notify jvmti/jvmdi
//
// NOTE: we do not notify a method_exit if we have a pending exception,
// including an exception we generate for unlocking checks. In the former
// case, JVMDI has already been notified by our call for the exception handler
// and in both cases as far as JVMDI is concerned we have already returned.
// If we notify it again JVMDI will be all confused about how many frames
// are still on the stack (4340444).
//
// NOTE Further! It turns out the JVMTI spec in fact expects to see
// method_exit events whenever we leave an activation unless it was done
// for popframe. This is nothing like jvmdi. However we are passing the
// tests at the moment (apparently because they are jvmdi based) so rather
// than change this code and possibly fail tests we will leave it alone
// (with this note) in anticipation of changing the vm and the tests
// simultaneously.
suppress_exit_event = suppress_exit_event || illegal_state_oop() != nullptr;
// Whenever JVMTI puts a thread in interp_only_mode, method
// entry/exit events are sent for that thread to track stack depth.
if (JVMTI_ENABLED && !suppress_exit_event && THREAD->is_interp_only_mode()) {
// Prevent any HandleMarkCleaner from freeing our live handles
HandleMark __hm(THREAD);
CALL_VM_NOCHECK(InterpreterRuntime::post_method_exit(THREAD));
}
//
// See if we are returning any exception
// A pending exception that was pending prior to a possible popping frame
// overrides the popping frame.
//
assert(!suppress_error || (suppress_error && illegal_state_oop() == nullptr), "Error was not suppressed");
if (illegal_state_oop() != nullptr || original_exception() != nullptr) {
// Inform the frame manager we have no result.
istate->set_msg(throwing_exception);
if (illegal_state_oop() != nullptr)
THREAD->set_pending_exception(illegal_state_oop(), nullptr, 0);
else
THREAD->set_pending_exception(original_exception(), nullptr, 0);
UPDATE_PC_AND_RETURN(0);
}
if (istate->msg() == popping_frame) {
// Make it simpler on the assembly code and set the message for the frame pop.
// returns
if (istate->prev() == nullptr) {
// We must be returning to a deoptimized frame (because popframe only happens between
// two interpreted frames). We need to save the current arguments in C heap so that
// the deoptimized frame when it restarts can copy the arguments to its expression
// stack and re-execute the call. We also have to notify deoptimization that this
// has occurred and to pick the preserved args copy them to the deoptimized frame's
// java expression stack. Yuck.
//
THREAD->popframe_preserve_args(in_ByteSize(METHOD->size_of_parameters() * wordSize),
LOCALS_SLOT(METHOD->size_of_parameters() - 1));
THREAD->set_popframe_condition_bit(JavaThread::popframe_force_deopt_reexecution_bit);
}
} else {
istate->set_msg(return_from_method);
}
// Normal return
// Advance the pc and return to frame manager
UPDATE_PC_AND_RETURN(1);
} /* handle_return: */
// This is really a fatal error return
finish:
DECACHE_TOS();
DECACHE_PC();
return;
}