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jdk/src/hotspot/cpu/riscv/templateInterpreterGenerator_riscv.cpp
Patricio Chilano Mateo 151450ea9b 8294744: AArch64: applications/kitchensink/Kitchensink.java crashed: assert(oopDesc::is_oop(obj)) failed: not an oop 
Co-authored-by: Fei Yang <fyang@openjdk.org>
Reviewed-by: aph, fyang, dcubed
2023-01-10 17:16:26 +00:00

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/*
* Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
* Copyright (c) 2020, 2022, Huawei Technologies Co., Ltd. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "classfile/javaClasses.hpp"
#include "gc/shared/barrierSetAssembler.hpp"
#include "interpreter/bytecodeHistogram.hpp"
#include "interpreter/bytecodeTracer.hpp"
#include "interpreter/interp_masm.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/templateInterpreterGenerator.hpp"
#include "interpreter/templateTable.hpp"
#include "memory/resourceArea.hpp"
#include "oops/arrayOop.hpp"
#include "oops/method.hpp"
#include "oops/methodData.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/arguments.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/jniHandles.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/timer.hpp"
#include "runtime/vframeArray.hpp"
#include "utilities/debug.hpp"
#include "utilities/powerOfTwo.hpp"
#include <sys/types.h>
#ifndef PRODUCT
#include "oops/method.hpp"
#endif // !PRODUCT
// Size of interpreter code. Increase if too small. Interpreter will
// fail with a guarantee ("not enough space for interpreter generation");
// if too small.
// Run with +PrintInterpreter to get the VM to print out the size.
// Max size with JVMTI
int TemplateInterpreter::InterpreterCodeSize = 256 * 1024;
#define __ _masm->
//-----------------------------------------------------------------------------
address TemplateInterpreterGenerator::generate_slow_signature_handler() {
address entry = __ pc();
__ andi(esp, esp, -16);
__ mv(c_rarg3, esp);
// xmethod
// xlocals
// c_rarg3: first stack arg - wordSize
// adjust sp
__ addi(sp, c_rarg3, -18 * wordSize);
__ addi(sp, sp, -2 * wordSize);
__ sd(ra, Address(sp, 0));
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::slow_signature_handler),
xmethod, xlocals, c_rarg3);
// x10: result handler
// Stack layout:
// sp: return address <- sp
// 1 garbage
// 8 integer args (if static first is unused)
// 1 float/double identifiers
// 8 double args
// stack args <- esp
// garbage
// expression stack bottom
// bcp (NULL)
// ...
// Restore ra
__ ld(ra, Address(sp, 0));
__ addi(sp, sp , 2 * wordSize);
// Do FP first so we can use c_rarg3 as temp
__ lwu(c_rarg3, Address(sp, 9 * wordSize)); // float/double identifiers
for (int i = 0; i < Argument::n_float_register_parameters_c; i++) {
const FloatRegister r = g_FPArgReg[i];
Label d, done;
__ andi(t0, c_rarg3, 1UL << i);
__ bnez(t0, d);
__ flw(r, Address(sp, (10 + i) * wordSize));
__ j(done);
__ bind(d);
__ fld(r, Address(sp, (10 + i) * wordSize));
__ bind(done);
}
// c_rarg0 contains the result from the call of
// InterpreterRuntime::slow_signature_handler so we don't touch it
// here. It will be loaded with the JNIEnv* later.
for (int i = 1; i < Argument::n_int_register_parameters_c; i++) {
const Register rm = g_INTArgReg[i];
__ ld(rm, Address(sp, i * wordSize));
}
__ addi(sp, sp, 18 * wordSize);
__ ret();
return entry;
}
// Various method entries
address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
// xmethod: Method*
// x19_sender_sp: sender sp
// esp: args
if (!InlineIntrinsics) {
return NULL; // Generate a vanilla entry
}
// These don't need a safepoint check because they aren't virtually
// callable. We won't enter these intrinsics from compiled code.
// If in the future we added an intrinsic which was virtually callable
// we'd have to worry about how to safepoint so that this code is used.
// mathematical functions inlined by compiler
// (interpreter must provide identical implementation
// in order to avoid monotonicity bugs when switching
// from interpreter to compiler in the middle of some
// computation)
//
// stack:
// [ arg ] <-- esp
// [ arg ]
// retaddr in ra
address fn = NULL;
address entry_point = NULL;
Register continuation = ra;
switch (kind) {
case Interpreter::java_lang_math_abs:
entry_point = __ pc();
__ fld(f10, Address(esp));
__ fabs_d(f10, f10);
__ mv(sp, x19_sender_sp); // Restore caller's SP
break;
case Interpreter::java_lang_math_sqrt:
entry_point = __ pc();
__ fld(f10, Address(esp));
__ fsqrt_d(f10, f10);
__ mv(sp, x19_sender_sp);
break;
case Interpreter::java_lang_math_sin :
entry_point = __ pc();
__ fld(f10, Address(esp));
__ mv(sp, x19_sender_sp);
__ mv(x9, ra);
continuation = x9; // The first callee-saved register
if (StubRoutines::dsin() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dsin);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dsin());
}
__ call(fn);
break;
case Interpreter::java_lang_math_cos :
entry_point = __ pc();
__ fld(f10, Address(esp));
__ mv(sp, x19_sender_sp);
__ mv(x9, ra);
continuation = x9; // The first callee-saved register
if (StubRoutines::dcos() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dcos);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dcos());
}
__ call(fn);
break;
case Interpreter::java_lang_math_tan :
entry_point = __ pc();
__ fld(f10, Address(esp));
__ mv(sp, x19_sender_sp);
__ mv(x9, ra);
continuation = x9; // The first callee-saved register
if (StubRoutines::dtan() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dtan);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dtan());
}
__ call(fn);
break;
case Interpreter::java_lang_math_log :
entry_point = __ pc();
__ fld(f10, Address(esp));
__ mv(sp, x19_sender_sp);
__ mv(x9, ra);
continuation = x9; // The first callee-saved register
if (StubRoutines::dlog() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dlog);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dlog());
}
__ call(fn);
break;
case Interpreter::java_lang_math_log10 :
entry_point = __ pc();
__ fld(f10, Address(esp));
__ mv(sp, x19_sender_sp);
__ mv(x9, ra);
continuation = x9; // The first callee-saved register
if (StubRoutines::dlog10() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dlog10());
}
__ call(fn);
break;
case Interpreter::java_lang_math_exp :
entry_point = __ pc();
__ fld(f10, Address(esp));
__ mv(sp, x19_sender_sp);
__ mv(x9, ra);
continuation = x9; // The first callee-saved register
if (StubRoutines::dexp() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dexp);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dexp());
}
__ call(fn);
break;
case Interpreter::java_lang_math_pow :
entry_point = __ pc();
__ mv(x9, ra);
continuation = x9;
__ fld(f10, Address(esp, 2 * Interpreter::stackElementSize));
__ fld(f11, Address(esp));
__ mv(sp, x19_sender_sp);
if (StubRoutines::dpow() == NULL) {
fn = CAST_FROM_FN_PTR(address, SharedRuntime::dpow);
} else {
fn = CAST_FROM_FN_PTR(address, StubRoutines::dpow());
}
__ call(fn);
break;
case Interpreter::java_lang_math_fmaD :
if (UseFMA) {
entry_point = __ pc();
__ fld(f10, Address(esp, 4 * Interpreter::stackElementSize));
__ fld(f11, Address(esp, 2 * Interpreter::stackElementSize));
__ fld(f12, Address(esp));
__ fmadd_d(f10, f10, f11, f12);
__ mv(sp, x19_sender_sp); // Restore caller's SP
}
break;
case Interpreter::java_lang_math_fmaF :
if (UseFMA) {
entry_point = __ pc();
__ flw(f10, Address(esp, 2 * Interpreter::stackElementSize));
__ flw(f11, Address(esp, Interpreter::stackElementSize));
__ flw(f12, Address(esp));
__ fmadd_s(f10, f10, f11, f12);
__ mv(sp, x19_sender_sp); // Restore caller's SP
}
break;
default:
;
}
if (entry_point != NULL) {
__ jr(continuation);
}
return entry_point;
}
// Abstract method entry
// Attempt to execute abstract method. Throw exception
address TemplateInterpreterGenerator::generate_abstract_entry(void) {
// xmethod: Method*
// x19_sender_sp: sender SP
address entry_point = __ pc();
// abstract method entry
// pop return address, reset last_sp to NULL
__ empty_expression_stack();
__ restore_bcp(); // bcp must be correct for exception handler (was destroyed)
__ restore_locals(); // make sure locals pointer is correct as well (was destroyed)
// throw exception
__ call_VM(noreg, CAST_FROM_FN_PTR(address,
InterpreterRuntime::throw_AbstractMethodErrorWithMethod),
xmethod);
// the call_VM checks for exception, so we should never return here.
__ should_not_reach_here();
return entry_point;
}
address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
address entry = __ pc();
#ifdef ASSERT
{
Label L;
__ ld(t0, Address(fp, frame::interpreter_frame_monitor_block_top_offset * wordSize));
// maximal sp for current fp (stack grows negative)
// check if frame is complete
__ bge(t0, sp, L);
__ stop ("interpreter frame not set up");
__ bind(L);
}
#endif // ASSERT
// Restore bcp under the assumption that the current frame is still
// interpreted
__ restore_bcp();
// expression stack must be empty before entering the VM if an
// exception happened
__ empty_expression_stack();
// throw exception
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
return entry;
}
address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
address entry = __ pc();
// expression stack must be empty before entering the VM if an
// exception happened
__ empty_expression_stack();
// setup parameters
// convention: expect aberrant index in register x11
__ zero_extend(c_rarg2, x11, 32);
// convention: expect array in register x13
__ mv(c_rarg1, x13);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::
throw_ArrayIndexOutOfBoundsException),
c_rarg1, c_rarg2);
return entry;
}
address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
address entry = __ pc();
// object is at TOS
__ pop_reg(c_rarg1);
// expression stack must be empty before entering the VM if an
// exception happened
__ empty_expression_stack();
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::
throw_ClassCastException),
c_rarg1);
return entry;
}
address TemplateInterpreterGenerator::generate_exception_handler_common(
const char* name, const char* message, bool pass_oop) {
assert(!pass_oop || message == NULL, "either oop or message but not both");
address entry = __ pc();
if (pass_oop) {
// object is at TOS
__ pop_reg(c_rarg2);
}
// expression stack must be empty before entering the VM if an
// exception happened
__ empty_expression_stack();
// setup parameters
__ la(c_rarg1, Address((address)name));
if (pass_oop) {
__ call_VM(x10, CAST_FROM_FN_PTR(address,
InterpreterRuntime::
create_klass_exception),
c_rarg1, c_rarg2);
} else {
// kind of lame ExternalAddress can't take NULL because
// external_word_Relocation will assert.
if (message != NULL) {
__ la(c_rarg2, Address((address)message));
} else {
__ mv(c_rarg2, NULL_WORD);
}
__ call_VM(x10,
CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
c_rarg1, c_rarg2);
}
// throw exception
__ j(address(Interpreter::throw_exception_entry()));
return entry;
}
address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
address entry = __ pc();
// Restore stack bottom in case i2c adjusted stack
__ ld(esp, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
// and NULL it as marker that esp is now tos until next java call
__ sd(zr, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
__ restore_bcp();
__ restore_locals();
__ restore_constant_pool_cache();
__ get_method(xmethod);
if (state == atos) {
Register obj = x10;
Register mdp = x11;
Register tmp = x12;
__ ld(mdp, Address(xmethod, Method::method_data_offset()));
__ profile_return_type(mdp, obj, tmp);
}
// Pop N words from the stack
__ get_cache_and_index_at_bcp(x11, x12, 1, index_size);
__ ld(x11, Address(x11, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()));
__ andi(x11, x11, ConstantPoolCacheEntry::parameter_size_mask);
__ shadd(esp, x11, esp, t0, 3);
// Restore machine SP
__ restore_sp_after_call();
__ check_and_handle_popframe(xthread);
__ check_and_handle_earlyret(xthread);
__ get_dispatch();
__ dispatch_next(state, step);
return entry;
}
address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state,
int step,
address continuation) {
address entry = __ pc();
__ restore_bcp();
__ restore_locals();
__ restore_constant_pool_cache();
__ get_method(xmethod);
__ get_dispatch();
__ restore_sp_after_call(); // Restore SP to extended SP
// Restore expression stack pointer
__ ld(esp, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
// NULL last_sp until next java call
__ sd(zr, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
// handle exceptions
{
Label L;
__ ld(t0, Address(xthread, Thread::pending_exception_offset()));
__ beqz(t0, L);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception));
__ should_not_reach_here();
__ bind(L);
}
if (continuation == NULL) {
__ dispatch_next(state, step);
} else {
__ jump_to_entry(continuation);
}
return entry;
}
address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {
address entry = __ pc();
if (type == T_OBJECT) {
// retrieve result from frame
__ ld(x10, Address(fp, frame::interpreter_frame_oop_temp_offset * wordSize));
// and verify it
__ verify_oop(x10);
} else {
__ cast_primitive_type(type, x10);
}
__ ret(); // return from result handler
return entry;
}
address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state,
address runtime_entry) {
assert_cond(runtime_entry != NULL);
address entry = __ pc();
__ push(state);
__ push_cont_fastpath(xthread);
__ call_VM(noreg, runtime_entry);
__ pop_cont_fastpath(xthread);
__ membar(MacroAssembler::AnyAny);
__ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));
return entry;
}
// Helpers for commoning out cases in the various type of method entries.
//
// increment invocation count & check for overflow
//
// Note: checking for negative value instead of overflow
// so we have a 'sticky' overflow test
//
// xmethod: method
//
void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
Label done;
// Note: In tiered we increment either counters in Method* or in MDO depending if we're profiling or not.
int increment = InvocationCounter::count_increment;
Label no_mdo;
if (ProfileInterpreter) {
// Are we profiling?
__ ld(x10, Address(xmethod, Method::method_data_offset()));
__ beqz(x10, no_mdo);
// Increment counter in the MDO
const Address mdo_invocation_counter(x10, in_bytes(MethodData::invocation_counter_offset()) +
in_bytes(InvocationCounter::counter_offset()));
const Address mask(x10, in_bytes(MethodData::invoke_mask_offset()));
__ increment_mask_and_jump(mdo_invocation_counter, increment, mask, t0, t1, false, overflow);
__ j(done);
}
__ bind(no_mdo);
// Increment counter in MethodCounters
const Address invocation_counter(t1,
MethodCounters::invocation_counter_offset() +
InvocationCounter::counter_offset());
__ get_method_counters(xmethod, t1, done);
const Address mask(t1, in_bytes(MethodCounters::invoke_mask_offset()));
__ increment_mask_and_jump(invocation_counter, increment, mask, t0, x11, false, overflow);
__ bind(done);
}
void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
__ mv(c_rarg1, zr);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), c_rarg1);
__ j(do_continue);
}
// See if we've got enough room on the stack for locals plus overhead
// below JavaThread::stack_overflow_limit(). If not, throw a StackOverflowError
// without going through the signal handler, i.e., reserved and yellow zones
// will not be made usable. The shadow zone must suffice to handle the
// overflow.
// The expression stack grows down incrementally, so the normal guard
// page mechanism will work for that.
//
// NOTE: Since the additional locals are also always pushed (wasn't
// obvious in generate_method_entry) so the guard should work for them
// too.
//
// Args:
// x13: number of additional locals this frame needs (what we must check)
// xmethod: Method*
//
// Kills:
// x10
void TemplateInterpreterGenerator::generate_stack_overflow_check(void) {
// monitor entry size: see picture of stack set
// (generate_method_entry) and frame_amd64.hpp
const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
// total overhead size: entry_size + (saved fp through expr stack
// bottom). be sure to change this if you add/subtract anything
// to/from the overhead area
const int overhead_size =
-(frame::interpreter_frame_initial_sp_offset * wordSize) + entry_size;
const int page_size = os::vm_page_size();
Label after_frame_check;
// see if the frame is greater than one page in size. If so,
// then we need to verify there is enough stack space remaining
// for the additional locals.
__ mv(t0, (page_size - overhead_size) / Interpreter::stackElementSize);
__ bleu(x13, t0, after_frame_check);
// compute sp as if this were going to be the last frame on
// the stack before the red zone
// locals + overhead, in bytes
__ mv(x10, overhead_size);
__ shadd(x10, x13, x10, t0, Interpreter::logStackElementSize); // 2 slots per parameter.
const Address stack_limit(xthread, JavaThread::stack_overflow_limit_offset());
__ ld(t0, stack_limit);
#ifdef ASSERT
Label limit_okay;
// Verify that thread stack limit is non-zero.
__ bnez(t0, limit_okay);
__ stop("stack overflow limit is zero");
__ bind(limit_okay);
#endif
// Add stack limit to locals.
__ add(x10, x10, t0);
// Check against the current stack bottom.
__ bgtu(sp, x10, after_frame_check);
// Remove the incoming args, peeling the machine SP back to where it
// was in the caller. This is not strictly necessary, but unless we
// do so the stack frame may have a garbage FP; this ensures a
// correct call stack that we can always unwind. The ANDI should be
// unnecessary because the sender SP in x19 is always aligned, but
// it doesn't hurt.
__ andi(sp, x19_sender_sp, -16);
// Note: the restored frame is not necessarily interpreted.
// Use the shared runtime version of the StackOverflowError.
assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
__ far_jump(RuntimeAddress(StubRoutines::throw_StackOverflowError_entry()));
// all done with frame size check
__ bind(after_frame_check);
}
// Allocate monitor and lock method (asm interpreter)
//
// Args:
// xmethod: Method*
// xlocals: locals
//
// Kills:
// x10
// c_rarg0, c_rarg1, c_rarg2, c_rarg3, ...(param regs)
// t0, t1 (temporary regs)
void TemplateInterpreterGenerator::lock_method() {
// synchronize method
const Address access_flags(xmethod, Method::access_flags_offset());
const Address monitor_block_top(fp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
#ifdef ASSERT
__ lwu(x10, access_flags);
__ verify_access_flags(x10, JVM_ACC_SYNCHRONIZED, "method doesn't need synchronization", false);
#endif // ASSERT
// get synchronization object
{
Label done;
__ lwu(x10, access_flags);
__ andi(t0, x10, JVM_ACC_STATIC);
// get receiver (assume this is frequent case)
__ ld(x10, Address(xlocals, Interpreter::local_offset_in_bytes(0)));
__ beqz(t0, done);
__ load_mirror(x10, xmethod, x15, t1);
#ifdef ASSERT
{
Label L;
__ bnez(x10, L);
__ stop("synchronization object is NULL");
__ bind(L);
}
#endif // ASSERT
__ bind(done);
}
// add space for monitor & lock
__ check_extended_sp();
__ add(sp, sp, - entry_size); // add space for a monitor entry
__ add(esp, esp, - entry_size);
__ sd(sp, Address(fp, frame::interpreter_frame_extended_sp_offset * wordSize));
__ sd(esp, monitor_block_top); // set new monitor block top
// store object
__ sd(x10, Address(esp, BasicObjectLock::obj_offset_in_bytes()));
__ mv(c_rarg1, esp); // object address
__ lock_object(c_rarg1);
}
// Generate a fixed interpreter frame. This is identical setup for
// interpreted methods and for native methods hence the shared code.
//
// Args:
// ra: return address
// xmethod: Method*
// xlocals: pointer to locals
// xcpool: cp cache
// stack_pointer: previous sp
void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
// initialize fixed part of activation frame
if (native_call) {
__ add(esp, sp, - 14 * wordSize);
__ mv(xbcp, zr);
__ add(sp, sp, - 14 * wordSize);
// add 2 zero-initialized slots for native calls
__ sd(zr, Address(sp, 13 * wordSize));
__ sd(zr, Address(sp, 12 * wordSize));
} else {
__ add(esp, sp, - 12 * wordSize);
__ ld(t0, Address(xmethod, Method::const_offset())); // get ConstMethod
__ add(xbcp, t0, in_bytes(ConstMethod::codes_offset())); // get codebase
__ add(sp, sp, - 12 * wordSize);
}
__ sd(xbcp, Address(sp, wordSize));
__ sd(esp, Address(sp, 0));
if (ProfileInterpreter) {
Label method_data_continue;
__ ld(t0, Address(xmethod, Method::method_data_offset()));
__ beqz(t0, method_data_continue);
__ la(t0, Address(t0, in_bytes(MethodData::data_offset())));
__ bind(method_data_continue);
}
__ sd(xmethod, Address(sp, 7 * wordSize));
__ sd(ProfileInterpreter ? t0 : zr, Address(sp, 6 * wordSize));
__ ld(xcpool, Address(xmethod, Method::const_offset()));
__ ld(xcpool, Address(xcpool, ConstMethod::constants_offset()));
__ ld(xcpool, Address(xcpool, ConstantPool::cache_offset_in_bytes()));
__ sd(xcpool, Address(sp, 3 * wordSize));
__ sd(xlocals, Address(sp, 2 * wordSize));
__ sd(ra, Address(sp, 11 * wordSize));
__ sd(fp, Address(sp, 10 * wordSize));
__ la(fp, Address(sp, 12 * wordSize)); // include ra & fp
// set sender sp
// leave last_sp as null
__ sd(x19_sender_sp, Address(sp, 9 * wordSize));
__ sd(zr, Address(sp, 8 * wordSize));
// Get mirror
__ load_mirror(t2, xmethod, x15, t1);
if (!native_call) {
__ ld(t0, Address(xmethod, Method::const_offset()));
__ lhu(t0, Address(t0, ConstMethod::max_stack_offset()));
__ add(t0, t0, MAX2(3, Method::extra_stack_entries()));
__ slli(t0, t0, 3);
__ sub(t0, sp, t0);
__ andi(t0, t0, -16);
// Store extended SP and mirror
__ sd(t0, Address(sp, 5 * wordSize));
__ sd(t2, Address(sp, 4 * wordSize));
// Move SP out of the way
__ mv(sp, t0);
} else {
// Make sure there is room for the exception oop pushed in case method throws
// an exception (see TemplateInterpreterGenerator::generate_throw_exception())
__ sub(t0, sp, 2 * wordSize);
__ sd(t0, Address(sp, 5 * wordSize));
__ sd(zr, Address(sp, 4 * wordSize));
__ mv(sp, t0);
}
}
// End of helpers
// Various method entries
//------------------------------------------------------------------------------------------------------------------------
//
//
// Method entry for java.lang.ref.Reference.get.
address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
// Code: _aload_0, _getfield, _areturn
// parameter size = 1
//
// The code that gets generated by this routine is split into 2 parts:
// 1. The "intrinsified" code for G1 (or any SATB based GC),
// 2. The slow path - which is an expansion of the regular method entry.
//
// Notes:-
// * In the G1 code we do not check whether we need to block for
// a safepoint. If G1 is enabled then we must execute the specialized
// code for Reference.get (except when the Reference object is null)
// so that we can log the value in the referent field with an SATB
// update buffer.
// If the code for the getfield template is modified so that the
// G1 pre-barrier code is executed when the current method is
// Reference.get() then going through the normal method entry
// will be fine.
// * The G1 code can, however, check the receiver object (the instance
// of java.lang.Reference) and jump to the slow path if null. If the
// Reference object is null then we obviously cannot fetch the referent
// and so we don't need to call the G1 pre-barrier. Thus we can use the
// regular method entry code to generate the NPE.
//
// This code is based on generate_accessor_entry.
//
// xmethod: Method*
// x19_sender_sp: senderSP must preserve for slow path, set SP to it on fast path
// ra is live. It must be saved around calls.
address entry = __ pc();
const int referent_offset = java_lang_ref_Reference::referent_offset();
guarantee(referent_offset > 0, "referent offset not initialized");
Label slow_path;
const Register local_0 = c_rarg0;
// Check if local 0 != NULL
// If the receiver is null then it is OK to jump to the slow path.
__ ld(local_0, Address(esp, 0));
__ beqz(local_0, slow_path);
// Load the value of the referent field.
const Address field_address(local_0, referent_offset);
BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
bs->load_at(_masm, IN_HEAP | ON_WEAK_OOP_REF, T_OBJECT, local_0, field_address, /*tmp1*/ t0, /*tmp2*/ t1);
// areturn
__ andi(sp, x19_sender_sp, -16); // done with stack
__ ret();
// generate a vanilla interpreter entry as the slow path
__ bind(slow_path);
__ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
return entry;
}
/**
* Method entry for static native methods:
* int java.util.zip.CRC32.update(int crc, int b)
*/
address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
// TODO: Unimplemented generate_CRC32_update_entry
return 0;
}
/**
* Method entry for static native methods:
* int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len)
* int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)
*/
address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
// TODO: Unimplemented generate_CRC32_updateBytes_entry
return 0;
}
/**
* Method entry for intrinsic-candidate (non-native) methods:
* int java.util.zip.CRC32C.updateBytes(int crc, byte[] b, int off, int end)
* int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long buf, int off, int end)
* Unlike CRC32, CRC32C does not have any methods marked as native
* CRC32C also uses an "end" variable instead of the length variable CRC32 uses
*/
address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
// TODO: Unimplemented generate_CRC32C_updateBytes_entry
return 0;
}
void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
// See more discussion in stackOverflow.hpp.
const int shadow_zone_size = checked_cast<int>(StackOverflow::stack_shadow_zone_size());
const int page_size = os::vm_page_size();
const int n_shadow_pages = shadow_zone_size / page_size;
#ifdef ASSERT
Label L_good_limit;
__ ld(t0, Address(xthread, JavaThread::shadow_zone_safe_limit()));
__ bnez(t0, L_good_limit);
__ stop("shadow zone safe limit is not initialized");
__ bind(L_good_limit);
Label L_good_watermark;
__ ld(t0, Address(xthread, JavaThread::shadow_zone_growth_watermark()));
__ bnez(t0, L_good_watermark);
__ stop("shadow zone growth watermark is not initialized");
__ bind(L_good_watermark);
#endif
Label L_done;
__ ld(t0, Address(xthread, JavaThread::shadow_zone_growth_watermark()));
__ bgtu(sp, t0, L_done);
for (int p = 1; p <= n_shadow_pages; p++) {
__ bang_stack_with_offset(p * page_size);
}
// Record the new watermark, but only if the update is above the safe limit.
// Otherwise, the next time around the check above would pass the safe limit.
__ ld(t0, Address(xthread, JavaThread::shadow_zone_safe_limit()));
__ bleu(sp, t0, L_done);
__ sd(sp, Address(xthread, JavaThread::shadow_zone_growth_watermark()));
__ bind(L_done);
}
// Interpreter stub for calling a native method. (asm interpreter)
// This sets up a somewhat different looking stack for calling the
// native method than the typical interpreter frame setup.
address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
// determine code generation flags
bool inc_counter = UseCompiler || CountCompiledCalls;
// x11: Method*
// x30: sender sp
address entry_point = __ pc();
const Address constMethod (xmethod, Method::const_offset());
const Address access_flags (xmethod, Method::access_flags_offset());
const Address size_of_parameters(x12, ConstMethod::
size_of_parameters_offset());
// get parameter size (always needed)
__ ld(x12, constMethod);
__ load_unsigned_short(x12, size_of_parameters);
// Native calls don't need the stack size check since they have no
// expression stack and the arguments are already on the stack and
// we only add a handful of words to the stack.
// xmethod: Method*
// x12: size of parameters
// x30: sender sp
// for natives the size of locals is zero
// compute beginning of parameters (xlocals)
__ shadd(xlocals, x12, esp, xlocals, 3);
__ addi(xlocals, xlocals, -wordSize);
// Pull SP back to minimum size: this avoids holes in the stack
__ andi(sp, esp, -16);
// initialize fixed part of activation frame
generate_fixed_frame(true);
// make sure method is native & not abstract
#ifdef ASSERT
__ lwu(x10, access_flags);
__ verify_access_flags(x10, JVM_ACC_NATIVE, "tried to execute non-native method as native", false);
__ verify_access_flags(x10, JVM_ACC_ABSTRACT, "tried to execute abstract method in interpreter");
#endif
// Since at this point in the method invocation the exception
// handler would try to exit the monitor of synchronized methods
// which hasn't been entered yet, we set the thread local variable
// _do_not_unlock_if_synchronized to true. The remove_activation
// will check this flag.
const Address do_not_unlock_if_synchronized(xthread,
in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
__ mv(t1, true);
__ sb(t1, do_not_unlock_if_synchronized);
// increment invocation count & check for overflow
Label invocation_counter_overflow;
if (inc_counter) {
generate_counter_incr(&invocation_counter_overflow);
}
Label continue_after_compile;
__ bind(continue_after_compile);
bang_stack_shadow_pages(true);
// reset the _do_not_unlock_if_synchronized flag
__ sb(zr, do_not_unlock_if_synchronized);
// check for synchronized methods
// Must happen AFTER invocation_counter check and stack overflow check,
// so method is not locked if overflows.
if (synchronized) {
lock_method();
} else {
// no synchronization necessary
#ifdef ASSERT
__ lwu(x10, access_flags);
__ verify_access_flags(x10, JVM_ACC_SYNCHRONIZED, "method needs synchronization");
#endif
}
// start execution
#ifdef ASSERT
__ verify_frame_setup();
#endif
// jvmti support
__ notify_method_entry();
// work registers
const Register t = x18;
const Register result_handler = x19;
// allocate space for parameters
__ ld(t, Address(xmethod, Method::const_offset()));
__ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset()));
__ slli(t, t, Interpreter::logStackElementSize);
__ sub(x30, esp, t);
__ andi(sp, x30, -16);
__ mv(esp, x30);
// get signature handler
{
Label L;
__ ld(t, Address(xmethod, Method::signature_handler_offset()));
__ bnez(t, L);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::prepare_native_call),
xmethod);
__ ld(t, Address(xmethod, Method::signature_handler_offset()));
__ bind(L);
}
// call signature handler
assert(InterpreterRuntime::SignatureHandlerGenerator::from() == xlocals,
"adjust this code");
assert(InterpreterRuntime::SignatureHandlerGenerator::to() == sp,
"adjust this code");
assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == t0,
"adjust this code");
// The generated handlers do not touch xmethod (the method).
// However, large signatures cannot be cached and are generated
// each time here. The slow-path generator can do a GC on return,
// so we must reload it after the call.
__ jalr(t);
__ get_method(xmethod); // slow path can do a GC, reload xmethod
// result handler is in x10
// set result handler
__ mv(result_handler, x10);
// pass mirror handle if static call
{
Label L;
__ lwu(t, Address(xmethod, Method::access_flags_offset()));
__ andi(t0, t, JVM_ACC_STATIC);
__ beqz(t0, L);
// get mirror
__ load_mirror(t, xmethod, x28, t1);
// copy mirror into activation frame
__ sd(t, Address(fp, frame::interpreter_frame_oop_temp_offset * wordSize));
// pass handle to mirror
__ addi(c_rarg1, fp, frame::interpreter_frame_oop_temp_offset * wordSize);
__ bind(L);
}
// get native function entry point in x28
{
Label L;
__ ld(x28, Address(xmethod, Method::native_function_offset()));
address unsatisfied = (SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
__ mv(t1, unsatisfied);
__ ld(t1, Address(t1, 0));
__ bne(x28, t1, L);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::prepare_native_call),
xmethod);
__ get_method(xmethod);
__ ld(x28, Address(xmethod, Method::native_function_offset()));
__ bind(L);
}
// pass JNIEnv
__ add(c_rarg0, xthread, in_bytes(JavaThread::jni_environment_offset()));
// It is enough that the pc() points into the right code
// segment. It does not have to be the correct return pc.
Label native_return;
__ set_last_Java_frame(esp, fp, native_return, x30);
// change thread state
#ifdef ASSERT
{
Label L;
__ lwu(t, Address(xthread, JavaThread::thread_state_offset()));
__ addi(t0, zr, (u1)_thread_in_Java);
__ beq(t, t0, L);
__ stop("Wrong thread state in native stub");
__ bind(L);
}
#endif
// Change state to native
__ la(t1, Address(xthread, JavaThread::thread_state_offset()));
__ mv(t0, _thread_in_native);
__ membar(MacroAssembler::LoadStore | MacroAssembler::StoreStore);
__ sw(t0, Address(t1));
// Call the native method.
__ jalr(x28);
__ bind(native_return);
__ get_method(xmethod);
// result potentially in x10 or f10
// make room for the pushes we're about to do
__ sub(t0, esp, 4 * wordSize);
__ andi(sp, t0, -16);
// NOTE: The order of these pushes is known to frame::interpreter_frame_result
// in order to extract the result of a method call. If the order of these
// pushes change or anything else is added to the stack then the code in
// interpreter_frame_result must also change.
__ push(dtos);
__ push(ltos);
// change thread state
// Force all preceding writes to be observed prior to thread state change
__ membar(MacroAssembler::LoadStore | MacroAssembler::StoreStore);
__ mv(t0, _thread_in_native_trans);
__ sw(t0, Address(xthread, JavaThread::thread_state_offset()));
// Force this write out before the read below
__ membar(MacroAssembler::AnyAny);
// check for safepoint operation in progress and/or pending suspend requests
{
Label L, Continue;
// We need an acquire here to ensure that any subsequent load of the
// global SafepointSynchronize::_state flag is ordered after this load
// of the thread-local polling word. We don't want this poll to
// return false (i.e. not safepointing) and a later poll of the global
// SafepointSynchronize::_state spuriously to return true.
//
// This is to avoid a race when we're in a native->Java transition
// racing the code which wakes up from a safepoint.
__ safepoint_poll(L, true /* at_return */, true /* acquire */, false /* in_nmethod */);
__ lwu(t1, Address(xthread, JavaThread::suspend_flags_offset()));
__ beqz(t1, Continue);
__ bind(L);
// Don't use call_VM as it will see a possible pending exception
// and forward it and never return here preventing us from
// clearing _last_native_pc down below. So we do a runtime call by
// hand.
//
__ mv(c_rarg0, xthread);
__ call(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
__ get_method(xmethod);
__ reinit_heapbase();
__ bind(Continue);
}
// change thread state
// Force all preceding writes to be observed prior to thread state change
__ membar(MacroAssembler::LoadStore | MacroAssembler::StoreStore);
__ mv(t0, _thread_in_Java);
__ sw(t0, Address(xthread, JavaThread::thread_state_offset()));
// reset_last_Java_frame
__ reset_last_Java_frame(true);
if (CheckJNICalls) {
// clear_pending_jni_exception_check
__ sd(zr, Address(xthread, JavaThread::pending_jni_exception_check_fn_offset()));
}
// reset handle block
__ ld(t, Address(xthread, JavaThread::active_handles_offset()));
__ sd(zr, Address(t, JNIHandleBlock::top_offset_in_bytes()));
// If result is an oop unbox and store it in frame where gc will see it
// and result handler will pick it up
{
Label no_oop;
__ la(t, ExternalAddress(AbstractInterpreter::result_handler(T_OBJECT)));
__ bne(t, result_handler, no_oop);
// Unbox oop result, e.g. JNIHandles::resolve result.
__ pop(ltos);
__ resolve_jobject(x10, t, t1);
__ sd(x10, Address(fp, frame::interpreter_frame_oop_temp_offset * wordSize));
// keep stack depth as expected by pushing oop which will eventually be discarded
__ push(ltos);
__ bind(no_oop);
}
{
Label no_reguard;
__ lwu(t0, Address(xthread, in_bytes(JavaThread::stack_guard_state_offset())));
__ addi(t1, zr, (u1)StackOverflow::stack_guard_yellow_reserved_disabled);
__ bne(t0, t1, no_reguard);
__ push_call_clobbered_registers();
__ mv(c_rarg0, xthread);
__ call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
__ pop_call_clobbered_registers();
__ bind(no_reguard);
}
// The method register is junk from after the thread_in_native transition
// until here. Also can't call_VM until the bcp has been
// restored. Need bcp for throwing exception below so get it now.
__ get_method(xmethod);
// restore bcp to have legal interpreter frame, i.e., bci == 0 <=>
// xbcp == code_base()
__ ld(xbcp, Address(xmethod, Method::const_offset())); // get ConstMethod*
__ add(xbcp, xbcp, in_bytes(ConstMethod::codes_offset())); // get codebase
// handle exceptions (exception handling will handle unlocking!)
{
Label L;
__ ld(t0, Address(xthread, Thread::pending_exception_offset()));
__ beqz(t0, L);
// Note: At some point we may want to unify this with the code
// used in call_VM_base(); i.e., we should use the
// StubRoutines::forward_exception code. For now this doesn't work
// here because the sp is not correctly set at this point.
__ MacroAssembler::call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::throw_pending_exception));
__ should_not_reach_here();
__ bind(L);
}
// do unlocking if necessary
{
Label L;
__ lwu(t, Address(xmethod, Method::access_flags_offset()));
__ andi(t0, t, JVM_ACC_SYNCHRONIZED);
__ beqz(t0, L);
// the code below should be shared with interpreter macro
// assembler implementation
{
Label unlock;
// BasicObjectLock will be first in list, since this is a
// synchronized method. However, need to check that the object
// has not been unlocked by an explicit monitorexit bytecode.
// monitor expect in c_rarg1 for slow unlock path
__ la(c_rarg1, Address(fp, // address of first monitor
(intptr_t)(frame::interpreter_frame_initial_sp_offset *
wordSize - sizeof(BasicObjectLock))));
__ ld(t, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));
__ bnez(t, unlock);
// Entry already unlocked, need to throw exception
__ MacroAssembler::call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::throw_illegal_monitor_state_exception));
__ should_not_reach_here();
__ bind(unlock);
__ unlock_object(c_rarg1);
}
__ bind(L);
}
// jvmti support
// Note: This must happen _after_ handling/throwing any exceptions since
// the exception handler code notifies the runtime of method exits
// too. If this happens before, method entry/exit notifications are
// not properly paired (was bug - gri 11/22/99).
__ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI);
__ pop(ltos);
__ pop(dtos);
__ jalr(result_handler);
// remove activation
__ ld(esp, Address(fp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp
// remove frame anchor
__ leave();
// restore sender sp
__ mv(sp, esp);
__ ret();
if (inc_counter) {
// Handle overflow of counter and compile method
__ bind(invocation_counter_overflow);
generate_counter_overflow(continue_after_compile);
}
return entry_point;
}
//
// Generic interpreted method entry to (asm) interpreter
//
address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
// determine code generation flags
const bool inc_counter = UseCompiler || CountCompiledCalls;
// t0: sender sp
address entry_point = __ pc();
const Address constMethod(xmethod, Method::const_offset());
const Address access_flags(xmethod, Method::access_flags_offset());
const Address size_of_parameters(x13,
ConstMethod::size_of_parameters_offset());
const Address size_of_locals(x13, ConstMethod::size_of_locals_offset());
// get parameter size (always needed)
// need to load the const method first
__ ld(x13, constMethod);
__ load_unsigned_short(x12, size_of_parameters);
// x12: size of parameters
__ load_unsigned_short(x13, size_of_locals); // get size of locals in words
__ sub(x13, x13, x12); // x13 = no. of additional locals
// see if we've got enough room on the stack for locals plus overhead.
generate_stack_overflow_check();
// compute beginning of parameters (xlocals)
__ shadd(xlocals, x12, esp, t1, 3);
__ add(xlocals, xlocals, -wordSize);
// Make room for additional locals
__ slli(t1, x13, 3);
__ sub(t0, esp, t1);
// Padding between locals and fixed part of activation frame to ensure
// SP is always 16-byte aligned.
__ andi(sp, t0, -16);
// x13 - # of additional locals
// allocate space for locals
// explicitly initialize locals
{
Label exit, loop;
__ blez(x13, exit); // do nothing if x13 <= 0
__ bind(loop);
__ sd(zr, Address(t0));
__ add(t0, t0, wordSize);
__ add(x13, x13, -1); // until everything initialized
__ bnez(x13, loop);
__ bind(exit);
}
// And the base dispatch table
__ get_dispatch();
// initialize fixed part of activation frame
generate_fixed_frame(false);
// make sure method is not native & not abstract
#ifdef ASSERT
__ lwu(x10, access_flags);
__ verify_access_flags(x10, JVM_ACC_NATIVE, "tried to execute native method as non-native");
__ verify_access_flags(x10, JVM_ACC_ABSTRACT, "tried to execute abstract method in interpreter");
#endif
// Since at this point in the method invocation the exception
// handler would try to exit the monitor of synchronized methods
// which hasn't been entered yet, we set the thread local variable
// _do_not_unlock_if_synchronized to true. The remove_activation
// will check this flag.
const Address do_not_unlock_if_synchronized(xthread,
in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
__ mv(t1, true);
__ sb(t1, do_not_unlock_if_synchronized);
Label no_mdp;
const Register mdp = x13;
__ ld(mdp, Address(xmethod, Method::method_data_offset()));
__ beqz(mdp, no_mdp);
__ add(mdp, mdp, in_bytes(MethodData::data_offset()));
__ profile_parameters_type(mdp, x11, x12, x14); // use x11, x12, x14 as tmp registers
__ bind(no_mdp);
// increment invocation count & check for overflow
Label invocation_counter_overflow;
if (inc_counter) {
generate_counter_incr(&invocation_counter_overflow);
}
Label continue_after_compile;
__ bind(continue_after_compile);
bang_stack_shadow_pages(false);
// reset the _do_not_unlock_if_synchronized flag
__ sb(zr, do_not_unlock_if_synchronized);
// check for synchronized methods
// Must happen AFTER invocation_counter check and stack overflow check,
// so method is not locked if overflows.
if (synchronized) {
// Allocate monitor and lock method
lock_method();
} else {
// no synchronization necessary
#ifdef ASSERT
__ lwu(x10, access_flags);
__ verify_access_flags(x10, JVM_ACC_SYNCHRONIZED, "method needs synchronization");
#endif
}
// start execution
#ifdef ASSERT
__ verify_frame_setup();
#endif
// jvmti support
__ notify_method_entry();
__ dispatch_next(vtos);
// invocation counter overflow
if (inc_counter) {
// Handle overflow of counter and compile method
__ bind(invocation_counter_overflow);
generate_counter_overflow(continue_after_compile);
}
return entry_point;
}
// Method entry for java.lang.Thread.currentThread
address TemplateInterpreterGenerator::generate_currentThread() {
address entry_point = __ pc();
__ ld(x10, Address(xthread, JavaThread::vthread_offset()));
__ resolve_oop_handle(x10, t0, t1);
__ ret();
return entry_point;
}
//-----------------------------------------------------------------------------
// Exceptions
void TemplateInterpreterGenerator::generate_throw_exception() {
// Entry point in previous activation (i.e., if the caller was
// interpreted)
Interpreter::_rethrow_exception_entry = __ pc();
// Restore sp to interpreter_frame_last_sp even though we are going
// to empty the expression stack for the exception processing.
__ sd(zr, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
// x10: exception
// x13: return address/pc that threw exception
__ restore_bcp(); // xbcp points to call/send
__ restore_locals();
__ restore_constant_pool_cache();
__ reinit_heapbase(); // restore xheapbase as heapbase.
__ get_dispatch();
// Entry point for exceptions thrown within interpreter code
Interpreter::_throw_exception_entry = __ pc();
// If we came here via a NullPointerException on the receiver of a
// method, xthread may be corrupt.
__ get_method(xmethod);
// expression stack is undefined here
// x10: exception
// xbcp: exception bcp
__ verify_oop(x10);
__ mv(c_rarg1, x10);
// expression stack must be empty before entering the VM in case of
// an exception
__ empty_expression_stack();
// find exception handler address and preserve exception oop
__ call_VM(x13,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::exception_handler_for_exception),
c_rarg1);
// Restore machine SP
__ restore_sp_after_call();
// x10: exception handler entry point
// x13: preserved exception oop
// xbcp: bcp for exception handler
__ push_ptr(x13); // push exception which is now the only value on the stack
__ jr(x10); // jump to exception handler (may be _remove_activation_entry!)
// If the exception is not handled in the current frame the frame is
// removed and the exception is rethrown (i.e. exception
// continuation is _rethrow_exception).
//
// Note: At this point the bci is still the bxi for the instruction
// which caused the exception and the expression stack is
// empty. Thus, for any VM calls at this point, GC will find a legal
// oop map (with empty expression stack).
//
// JVMTI PopFrame support
//
Interpreter::_remove_activation_preserving_args_entry = __ pc();
__ empty_expression_stack();
// Set the popframe_processing bit in pending_popframe_condition
// indicating that we are currently handling popframe, so that
// call_VMs that may happen later do not trigger new popframe
// handling cycles.
__ lwu(x13, Address(xthread, JavaThread::popframe_condition_offset()));
__ ori(x13, x13, JavaThread::popframe_processing_bit);
__ sw(x13, Address(xthread, JavaThread::popframe_condition_offset()));
{
// Check to see whether we are returning to a deoptimized frame.
// (The PopFrame call ensures that the caller of the popped frame is
// either interpreted or compiled and deoptimizes it if compiled.)
// In this case, we can't call dispatch_next() after the frame is
// popped, but instead must save the incoming arguments and restore
// them after deoptimization has occurred.
//
// Note that we don't compare the return PC against the
// deoptimization blob's unpack entry because of the presence of
// adapter frames in C2.
Label caller_not_deoptimized;
__ ld(c_rarg1, Address(fp, frame::return_addr_offset * wordSize));
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), c_rarg1);
__ bnez(x10, caller_not_deoptimized);
// Compute size of arguments for saving when returning to
// deoptimized caller
__ get_method(x10);
__ ld(x10, Address(x10, Method::const_offset()));
__ load_unsigned_short(x10, Address(x10, in_bytes(ConstMethod::
size_of_parameters_offset())));
__ slli(x10, x10, Interpreter::logStackElementSize);
__ restore_locals();
__ sub(xlocals, xlocals, x10);
__ add(xlocals, xlocals, wordSize);
// Save these arguments
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
Deoptimization::
popframe_preserve_args),
xthread, x10, xlocals);
__ remove_activation(vtos,
/* throw_monitor_exception */ false,
/* install_monitor_exception */ false,
/* notify_jvmdi */ false);
// Inform deoptimization that it is responsible for restoring
// these arguments
__ mv(t0, JavaThread::popframe_force_deopt_reexecution_bit);
__ sw(t0, Address(xthread, JavaThread::popframe_condition_offset()));
// Continue in deoptimization handler
__ ret();
__ bind(caller_not_deoptimized);
}
__ remove_activation(vtos,
/* throw_monitor_exception */ false,
/* install_monitor_exception */ false,
/* notify_jvmdi */ false);
// Restore the last_sp and null it out
__ ld(esp, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
__ sd(zr, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
__ restore_bcp();
__ restore_locals();
__ restore_constant_pool_cache();
__ get_method(xmethod);
__ get_dispatch();
// The method data pointer was incremented already during
// call profiling. We have to restore the mdp for the current bcp.
if (ProfileInterpreter) {
__ set_method_data_pointer_for_bcp();
}
// Clear the popframe condition flag
__ sw(zr, Address(xthread, JavaThread::popframe_condition_offset()));
assert(JavaThread::popframe_inactive == 0, "fix popframe_inactive");
#if INCLUDE_JVMTI
{
Label L_done;
__ lbu(t0, Address(xbcp, 0));
__ mv(t1, Bytecodes::_invokestatic);
__ bne(t1, t0, L_done);
// The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
// Detect such a case in the InterpreterRuntime function and return the member name argument,or NULL.
__ ld(c_rarg0, Address(xlocals, 0));
__ call_VM(x10, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),c_rarg0, xmethod, xbcp);
__ beqz(x10, L_done);
__ sd(x10, Address(esp, 0));
__ bind(L_done);
}
#endif // INCLUDE_JVMTI
// Restore machine SP
__ restore_sp_after_call();
__ dispatch_next(vtos);
// end of PopFrame support
Interpreter::_remove_activation_entry = __ pc();
// preserve exception over this code sequence
__ pop_ptr(x10);
__ sd(x10, Address(xthread, JavaThread::vm_result_offset()));
// remove the activation (without doing throws on illegalMonitorExceptions)
__ remove_activation(vtos, false, true, false);
// restore exception
__ get_vm_result(x10, xthread);
// In between activations - previous activation type unknown yet
// compute continuation point - the continuation point expects the
// following registers set up:
//
// x10: exception
// ra: return address/pc that threw exception
// sp: expression stack of caller
// fp: fp of caller
// FIXME: There's no point saving ra here because VM calls don't trash it
__ sub(sp, sp, 2 * wordSize);
__ sd(x10, Address(sp, 0)); // save exception
__ sd(ra, Address(sp, wordSize)); // save return address
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
SharedRuntime::exception_handler_for_return_address),
xthread, ra);
__ mv(x11, x10); // save exception handler
__ ld(x10, Address(sp, 0)); // restore exception
__ ld(ra, Address(sp, wordSize)); // restore return address
__ add(sp, sp, 2 * wordSize);
// We might be returning to a deopt handler that expects x13 to
// contain the exception pc
__ mv(x13, ra);
// Note that an "issuing PC" is actually the next PC after the call
__ jr(x11); // jump to exception
// handler of caller
}
//
// JVMTI ForceEarlyReturn support
//
address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
address entry = __ pc();
__ restore_bcp();
__ restore_locals();
__ empty_expression_stack();
__ load_earlyret_value(state);
__ ld(t0, Address(xthread, JavaThread::jvmti_thread_state_offset()));
Address cond_addr(t0, JvmtiThreadState::earlyret_state_offset());
// Clear the earlyret state
assert(JvmtiThreadState::earlyret_inactive == 0, "should be");
__ sd(zr, cond_addr);
__ remove_activation(state,
false, /* throw_monitor_exception */
false, /* install_monitor_exception */
true); /* notify_jvmdi */
__ ret();
return entry;
}
// end of ForceEarlyReturn support
//-----------------------------------------------------------------------------
// Helper for vtos entry point generation
void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
address& bep,
address& cep,
address& sep,
address& aep,
address& iep,
address& lep,
address& fep,
address& dep,
address& vep) {
assert(t != NULL && t->is_valid() && t->tos_in() == vtos, "illegal template");
Label L;
aep = __ pc(); __ push_ptr(); __ j(L);
fep = __ pc(); __ push_f(); __ j(L);
dep = __ pc(); __ push_d(); __ j(L);
lep = __ pc(); __ push_l(); __ j(L);
bep = cep = sep =
iep = __ pc(); __ push_i();
vep = __ pc();
__ bind(L);
generate_and_dispatch(t);
}
//-----------------------------------------------------------------------------
// Non-product code
#ifndef PRODUCT
address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
address entry = __ pc();
__ push_reg(ra);
__ push(state);
__ push_reg(RegSet::range(x10, x17) + RegSet::range(x5, x7) + RegSet::range(x28, x31), sp);
__ mv(c_rarg2, x10); // Pass itos
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), c_rarg1, c_rarg2, c_rarg3);
__ pop_reg(RegSet::range(x10, x17) + RegSet::range(x5, x7) + RegSet::range(x28, x31), sp);
__ pop(state);
__ pop_reg(ra);
__ ret(); // return from result handler
return entry;
}
void TemplateInterpreterGenerator::count_bytecode() {
__ mv(x7, (address) &BytecodeCounter::_counter_value);
__ atomic_addw(noreg, 1, x7);
}
void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
__ mv(x7, (address) &BytecodeHistogram::_counters[t->bytecode()]);
__ atomic_addw(noreg, 1, x7);
}
void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
// Calculate new index for counter:
// _index = (_index >> log2_number_of_codes) |
// (bytecode << log2_number_of_codes);
Register index_addr = t1;
Register index = t0;
__ mv(index_addr, (address) &BytecodePairHistogram::_index);
__ lw(index, index_addr);
__ mv(x7, ((int)t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);
__ srli(index, index, BytecodePairHistogram::log2_number_of_codes);
__ orrw(index, x7, index);
__ sw(index, index_addr);
// Bump bucket contents:
// _counters[_index] ++;
Register counter_addr = t1;
__ mv(x7, (address) &BytecodePairHistogram::_counters);
__ slli(index, index, LogBytesPerInt);
__ add(counter_addr, x7, index);
__ atomic_addw(noreg, 1, counter_addr);
}
void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
// Call a little run-time stub to avoid blow-up for each bytecode.
// The run-time runtime saves the right registers, depending on
// the tosca in-state for the given template.
assert(Interpreter::trace_code(t->tos_in()) != NULL, "entry must have been generated");
__ jal(Interpreter::trace_code(t->tos_in()));
__ reinit_heapbase();
}
void TemplateInterpreterGenerator::stop_interpreter_at() {
Label L;
__ push_reg(t0);
__ mv(t0, (address) &BytecodeCounter::_counter_value);
__ ld(t0, Address(t0));
__ mv(t1, StopInterpreterAt);
__ bne(t0, t1, L);
__ ebreak();
__ bind(L);
__ pop_reg(t0);
}
#endif // !PRODUCT
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