JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2018, Oracle and/or its affiliates. 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.
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*/
#include "precompiled.hpp"
#include "asm/macroAssembler.hpp"
#include "compiler/disassembler.hpp"
#include "gc/shared/barrierSetAssembler.hpp"
#include "interpreter/bytecodeHistogram.hpp"
#include "interpreter/interp_masm.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/templateInterpreterGenerator.hpp"
#include "interpreter/templateTable.hpp"
#include "oops/arrayOop.hpp"
#include "oops/methodData.hpp"
#include "oops/method.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/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/timer.hpp"
#include "runtime/vframeArray.hpp"
#include "utilities/debug.hpp"
#include "utilities/macros.hpp"
#define __ Disassembler::hook<InterpreterMacroAssembler>(__FILE__, __LINE__, _masm)->
// 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
#ifdef AMD64
int TemplateInterpreter::InterpreterCodeSize = JVMCI_ONLY(268) NOT_JVMCI(256) * 1024;
#else
int TemplateInterpreter::InterpreterCodeSize = 224 * 1024;
#endif // AMD64
// Global Register Names
static const Register rbcp = LP64_ONLY(r13) NOT_LP64(rsi);
static const Register rlocals = LP64_ONLY(r14) NOT_LP64(rdi);
const int method_offset = frame::interpreter_frame_method_offset * wordSize;
const int bcp_offset = frame::interpreter_frame_bcp_offset * wordSize;
const int locals_offset = frame::interpreter_frame_locals_offset * wordSize;
//-----------------------------------------------------------------------------
address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
address entry = __ pc();
#ifdef ASSERT
{
Label L;
__ lea(rax, Address(rbp,
frame::interpreter_frame_monitor_block_top_offset *
wordSize));
__ cmpptr(rax, rsp); // rax = maximal rsp for current rbp (stack
// grows negative)
__ jcc(Assembler::aboveEqual, L); // check if frame is complete
__ 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();
// The expression stack must be empty before entering the VM if an
// exception happened.
__ empty_expression_stack();
// Setup parameters.
// ??? convention: expect aberrant index in register ebx/rbx.
// Pass array to create more detailed exceptions.
Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::
throw_ArrayIndexOutOfBoundsException),
rarg, rbx);
return entry;
}
address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
address entry = __ pc();
// object is at TOS
Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
__ pop(rarg);
// 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),
rarg);
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();
Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
Register rarg2 = NOT_LP64(rbx) LP64_ONLY(c_rarg2);
if (pass_oop) {
// object is at TOS
__ pop(rarg2);
}
// expression stack must be empty before entering the VM if an
// exception happened
__ empty_expression_stack();
// setup parameters
__ lea(rarg, ExternalAddress((address)name));
if (pass_oop) {
__ call_VM(rax, CAST_FROM_FN_PTR(address,
InterpreterRuntime::
create_klass_exception),
rarg, rarg2);
} else {
__ lea(rarg2, ExternalAddress((address)message));
__ call_VM(rax,
CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
rarg, rarg2);
}
// throw exception
__ jump(ExternalAddress(Interpreter::throw_exception_entry()));
return entry;
}
address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
address entry = __ pc();
#ifndef _LP64
#ifdef COMPILER2
// The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
for (int i = 1; i < 8; i++) {
__ ffree(i);
}
} else if (UseSSE < 2) {
__ empty_FPU_stack();
}
#endif // COMPILER2
if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
__ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled");
} else {
__ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");
}
if (state == ftos) {
__ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_return_entry_for in interpreter");
} else if (state == dtos) {
__ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_return_entry_for in interpreter");
}
#endif // _LP64
// Restore stack bottom in case i2c adjusted stack
__ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
// and NULL it as marker that esp is now tos until next java call
__ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
__ restore_bcp();
__ restore_locals();
if (state == atos) {
Register mdp = rbx;
Register tmp = rcx;
__ profile_return_type(mdp, rax, tmp);
}
const Register cache = rbx;
const Register index = rcx;
__ get_cache_and_index_at_bcp(cache, index, 1, index_size);
const Register flags = cache;
__ movl(flags, Address(cache, index, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()));
__ andl(flags, ConstantPoolCacheEntry::parameter_size_mask);
__ lea(rsp, Address(rsp, flags, Interpreter::stackElementScale()));
const Register java_thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
if (JvmtiExport::can_pop_frame()) {
NOT_LP64(__ get_thread(java_thread));
__ check_and_handle_popframe(java_thread);
}
if (JvmtiExport::can_force_early_return()) {
NOT_LP64(__ get_thread(java_thread));
__ check_and_handle_earlyret(java_thread);
}
__ dispatch_next(state, step);
return entry;
}
address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step, address continuation) {
address entry = __ pc();
#ifndef _LP64
if (state == ftos) {
__ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_deopt_entry_for in interpreter");
} else if (state == dtos) {
__ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_deopt_entry_for in interpreter");
}
#endif // _LP64
// NULL last_sp until next java call
__ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
__ restore_bcp();
__ restore_locals();
const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
NOT_LP64(__ get_thread(thread));
#if INCLUDE_JVMCI
// Check if we need to take lock at entry of synchronized method. This can
// only occur on method entry so emit it only for vtos with step 0.
if ((EnableJVMCI || UseAOT) && state == vtos && step == 0) {
Label L;
__ cmpb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);
__ jcc(Assembler::zero, L);
// Clear flag.
__ movb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);
// Satisfy calling convention for lock_method().
__ get_method(rbx);
// Take lock.
lock_method();
__ bind(L);
} else {
#ifdef ASSERT
if (EnableJVMCI) {
Label L;
__ cmpb(Address(r15_thread, JavaThread::pending_monitorenter_offset()), 0);
__ jcc(Assembler::zero, L);
__ stop("unexpected pending monitor in deopt entry");
__ bind(L);
}
#endif
}
#endif
// handle exceptions
{
Label L;
__ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);
__ jcc(Assembler::zero, 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();
switch (type) {
case T_BOOLEAN: __ c2bool(rax); break;
#ifndef _LP64
case T_CHAR : __ andptr(rax, 0xFFFF); break;
#else
case T_CHAR : __ movzwl(rax, rax); break;
#endif // _LP64
case T_BYTE : __ sign_extend_byte(rax); break;
case T_SHORT : __ sign_extend_short(rax); break;
case T_INT : /* nothing to do */ break;
case T_LONG : /* nothing to do */ break;
case T_VOID : /* nothing to do */ break;
#ifndef _LP64
case T_DOUBLE :
case T_FLOAT :
{ const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
__ pop(t); // remove return address first
// Must return a result for interpreter or compiler. In SSE
// mode, results are returned in xmm0 and the FPU stack must
// be empty.
if (type == T_FLOAT && UseSSE >= 1) {
// Load ST0
__ fld_d(Address(rsp, 0));
// Store as float and empty fpu stack
__ fstp_s(Address(rsp, 0));
// and reload
__ movflt(xmm0, Address(rsp, 0));
} else if (type == T_DOUBLE && UseSSE >= 2 ) {
__ movdbl(xmm0, Address(rsp, 0));
} else {
// restore ST0
__ fld_d(Address(rsp, 0));
}
// and pop the temp
__ addptr(rsp, 2 * wordSize);
__ push(t); // restore return address
}
break;
#else
case T_FLOAT : /* nothing to do */ break;
case T_DOUBLE : /* nothing to do */ break;
#endif // _LP64
case T_OBJECT :
// retrieve result from frame
__ movptr(rax, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize));
// and verify it
__ verify_oop(rax);
break;
default : ShouldNotReachHere();
}
__ ret(0); // return from result handler
return entry;
}
address TemplateInterpreterGenerator::generate_safept_entry_for(
TosState state,
address runtime_entry) {
address entry = __ pc();
__ push(state);
__ call_VM(noreg, runtime_entry);
__ 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
//
// rbx: method
// rcx: invocation counter
//
void TemplateInterpreterGenerator::generate_counter_incr(
Label* overflow,
Label* profile_method,
Label* profile_method_continue) {
Label done;
// Note: In tiered we increment either counters in Method* or in MDO depending if we're profiling or not.
if (TieredCompilation) {
int increment = InvocationCounter::count_increment;
Label no_mdo;
if (ProfileInterpreter) {
// Are we profiling?
__ movptr(rax, Address(rbx, Method::method_data_offset()));
__ testptr(rax, rax);
__ jccb(Assembler::zero, no_mdo);
// Increment counter in the MDO
const Address mdo_invocation_counter(rax, in_bytes(MethodData::invocation_counter_offset()) +
in_bytes(InvocationCounter::counter_offset()));
const Address mask(rax, in_bytes(MethodData::invoke_mask_offset()));
__ increment_mask_and_jump(mdo_invocation_counter, increment, mask, rcx, false, Assembler::zero, overflow);
__ jmp(done);
}
__ bind(no_mdo);
// Increment counter in MethodCounters
const Address invocation_counter(rax,
MethodCounters::invocation_counter_offset() +
InvocationCounter::counter_offset());
__ get_method_counters(rbx, rax, done);
const Address mask(rax, in_bytes(MethodCounters::invoke_mask_offset()));
__ increment_mask_and_jump(invocation_counter, increment, mask, rcx,
false, Assembler::zero, overflow);
__ bind(done);
} else { // not TieredCompilation
const Address backedge_counter(rax,
MethodCounters::backedge_counter_offset() +
InvocationCounter::counter_offset());
const Address invocation_counter(rax,
MethodCounters::invocation_counter_offset() +
InvocationCounter::counter_offset());
__ get_method_counters(rbx, rax, done);
if (ProfileInterpreter) {
__ incrementl(Address(rax,
MethodCounters::interpreter_invocation_counter_offset()));
}
// Update standard invocation counters
__ movl(rcx, invocation_counter);
__ incrementl(rcx, InvocationCounter::count_increment);
__ movl(invocation_counter, rcx); // save invocation count
__ movl(rax, backedge_counter); // load backedge counter
__ andl(rax, InvocationCounter::count_mask_value); // mask out the status bits
__ addl(rcx, rax); // add both counters
// profile_method is non-null only for interpreted method so
// profile_method != NULL == !native_call
if (ProfileInterpreter && profile_method != NULL) {
// Test to see if we should create a method data oop
__ movptr(rax, Address(rbx, Method::method_counters_offset()));
__ cmp32(rcx, Address(rax, in_bytes(MethodCounters::interpreter_profile_limit_offset())));
__ jcc(Assembler::less, *profile_method_continue);
// if no method data exists, go to profile_method
__ test_method_data_pointer(rax, *profile_method);
}
__ movptr(rax, Address(rbx, Method::method_counters_offset()));
__ cmp32(rcx, Address(rax, in_bytes(MethodCounters::interpreter_invocation_limit_offset())));
__ jcc(Assembler::aboveEqual, *overflow);
__ bind(done);
}
}
void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
// Asm interpreter on entry
// r14/rdi - locals
// r13/rsi - bcp
// rbx - method
// rdx - cpool --- DOES NOT APPEAR TO BE TRUE
// rbp - interpreter frame
// On return (i.e. jump to entry_point) [ back to invocation of interpreter ]
// Everything as it was on entry
// rdx is not restored. Doesn't appear to really be set.
// InterpreterRuntime::frequency_counter_overflow takes two
// arguments, the first (thread) is passed by call_VM, the second
// indicates if the counter overflow occurs at a backwards branch
// (NULL bcp). We pass zero for it. The call returns the address
// of the verified entry point for the method or NULL if the
// compilation did not complete (either went background or bailed
// out).
Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
__ movl(rarg, 0);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::frequency_counter_overflow),
rarg);
__ movptr(rbx, Address(rbp, method_offset)); // restore Method*
// Preserve invariant that r13/r14 contain bcp/locals of sender frame
// and jump to the interpreted entry.
__ jmp(do_continue, relocInfo::none);
}
// 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_fixed_frame) so the guard should work for them
// too.
//
// Args:
// rdx: number of additional locals this frame needs (what we must check)
// rbx: Method*
//
// Kills:
// rax
void TemplateInterpreterGenerator::generate_stack_overflow_check(void) {
// monitor entry size: see picture of stack in frame_x86.hpp
const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
// total overhead size: entry_size + (saved rbp 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.
__ cmpl(rdx, (page_size - overhead_size) / Interpreter::stackElementSize);
__ jcc(Assembler::belowEqual, after_frame_check);
// compute rsp as if this were going to be the last frame on
// the stack before the red zone
Label after_frame_check_pop;
const Register thread = NOT_LP64(rsi) LP64_ONLY(r15_thread);
#ifndef _LP64
__ push(thread);
__ get_thread(thread);
#endif
const Address stack_limit(thread, JavaThread::stack_overflow_limit_offset());
// locals + overhead, in bytes
__ mov(rax, rdx);
__ shlptr(rax, Interpreter::logStackElementSize); // Convert parameter count to bytes.
__ addptr(rax, overhead_size);
#ifdef ASSERT
Label limit_okay;
// Verify that thread stack overflow limit is non-zero.
__ cmpptr(stack_limit, (int32_t)NULL_WORD);
__ jcc(Assembler::notEqual, limit_okay);
__ stop("stack overflow limit is zero");
__ bind(limit_okay);
#endif
// Add locals/frame size to stack limit.
__ addptr(rax, stack_limit);
// Check against the current stack bottom.
__ cmpptr(rsp, rax);
__ jcc(Assembler::above, after_frame_check_pop);
NOT_LP64(__ pop(rsi)); // get saved bcp
// Restore sender's sp as SP. This is necessary if the sender's
// frame is an extended compiled frame (see gen_c2i_adapter())
// and safer anyway in case of JSR292 adaptations.
__ pop(rax); // return address must be moved if SP is changed
__ mov(rsp, rbcp);
__ push(rax);
// 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");
__ jump(ExternalAddress(StubRoutines::throw_StackOverflowError_entry()));
// all done with frame size check
__ bind(after_frame_check_pop);
NOT_LP64(__ pop(rsi));
// all done with frame size check
__ bind(after_frame_check);
}
// Allocate monitor and lock method (asm interpreter)
//
// Args:
// rbx: Method*
// r14/rdi: locals
//
// Kills:
// rax
// c_rarg0, c_rarg1, c_rarg2, c_rarg3, ...(param regs)
// rscratch1, rscratch2 (scratch regs)
void TemplateInterpreterGenerator::lock_method() {
// synchronize method
const Address access_flags(rbx, Method::access_flags_offset());
const Address monitor_block_top(
rbp,
frame::interpreter_frame_monitor_block_top_offset * wordSize);
const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
#ifdef ASSERT
{
Label L;
__ movl(rax, access_flags);
__ testl(rax, JVM_ACC_SYNCHRONIZED);
__ jcc(Assembler::notZero, L);
__ stop("method doesn't need synchronization");
__ bind(L);
}
#endif // ASSERT
// get synchronization object
{
Label done;
__ movl(rax, access_flags);
__ testl(rax, JVM_ACC_STATIC);
// get receiver (assume this is frequent case)
__ movptr(rax, Address(rlocals, Interpreter::local_offset_in_bytes(0)));
__ jcc(Assembler::zero, done);
__ load_mirror(rax, rbx);
#ifdef ASSERT
{
Label L;
__ testptr(rax, rax);
__ jcc(Assembler::notZero, L);
__ stop("synchronization object is NULL");
__ bind(L);
}
#endif // ASSERT
__ bind(done);
__ resolve(IS_NOT_NULL, rax);
}
// add space for monitor & lock
__ subptr(rsp, entry_size); // add space for a monitor entry
__ movptr(monitor_block_top, rsp); // set new monitor block top
// store object
__ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax);
const Register lockreg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
__ movptr(lockreg, rsp); // object address
__ lock_object(lockreg);
}
// Generate a fixed interpreter frame. This is identical setup for
// interpreted methods and for native methods hence the shared code.
//
// Args:
// rax: return address
// rbx: Method*
// r14/rdi: pointer to locals
// r13/rsi: sender sp
// rdx: cp cache
void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
// initialize fixed part of activation frame
__ push(rax); // save return address
__ enter(); // save old & set new rbp
__ push(rbcp); // set sender sp
__ push((int)NULL_WORD); // leave last_sp as null
__ movptr(rbcp, Address(rbx, Method::const_offset())); // get ConstMethod*
__ lea(rbcp, Address(rbcp, ConstMethod::codes_offset())); // get codebase
__ push(rbx); // save Method*
// Get mirror and store it in the frame as GC root for this Method*
__ load_mirror(rdx, rbx);
__ push(rdx);
if (ProfileInterpreter) {
Label method_data_continue;
__ movptr(rdx, Address(rbx, in_bytes(Method::method_data_offset())));
__ testptr(rdx, rdx);
__ jcc(Assembler::zero, method_data_continue);
__ addptr(rdx, in_bytes(MethodData::data_offset()));
__ bind(method_data_continue);
__ push(rdx); // set the mdp (method data pointer)
} else {
__ push(0);
}
__ movptr(rdx, Address(rbx, Method::const_offset()));
__ movptr(rdx, Address(rdx, ConstMethod::constants_offset()));
__ movptr(rdx, Address(rdx, ConstantPool::cache_offset_in_bytes()));
__ push(rdx); // set constant pool cache
__ push(rlocals); // set locals pointer
if (native_call) {
__ push(0); // no bcp
} else {
__ push(rbcp); // set bcp
}
__ push(0); // reserve word for pointer to expression stack bottom
__ movptr(Address(rsp, 0), rsp); // set expression stack bottom
}
// End of helpers
// 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 performing an ON_WEAK_OOP_REF load,
// 2. The slow path - which is an expansion of the regular method entry.
//
// Notes:-
// * An intrinsic is always executed, where an ON_WEAK_OOP_REF load is performed.
// * We may jump to the slow path iff the receiver is null. If the
// Reference object is null then we no longer perform an ON_WEAK_OOP_REF load
// Thus we can use the regular method entry code to generate the NPE.
//
// rbx: Method*
// r13: senderSP must preserve for slow path, set SP to it on fast path
address entry = __ pc();
const int referent_offset = java_lang_ref_Reference::referent_offset;
guarantee(referent_offset > 0, "referent offset not initialized");
Label slow_path;
// rbx: method
// Check if local 0 != NULL
// If the receiver is null then it is OK to jump to the slow path.
__ movptr(rax, Address(rsp, wordSize));
__ testptr(rax, rax);
__ jcc(Assembler::zero, slow_path);
// rax: local 0
// rbx: method (but can be used as scratch now)
// rdx: scratch
// rdi: scratch
// Preserve the sender sp in case the load barrier
// calls the runtime
NOT_LP64(__ push(rsi));
// Load the value of the referent field.
const Address field_address(rax, referent_offset);
__ load_heap_oop(rax, field_address, /*tmp1*/ rbx, /*tmp_thread*/ rdx, ON_WEAK_OOP_REF);
// _areturn
const Register sender_sp = NOT_LP64(rsi) LP64_ONLY(r13);
NOT_LP64(__ pop(rsi)); // get sender sp
__ pop(rdi); // get return address
__ mov(rsp, sender_sp); // set sp to sender sp
__ jmp(rdi);
__ ret(0);
// generate a vanilla interpreter entry as the slow path
__ bind(slow_path);
__ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
return entry;
}
void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
// Quick & dirty stack overflow checking: bang the stack & handle trap.
// Note that we do the banging after the frame is setup, since the exception
// handling code expects to find a valid interpreter frame on the stack.
// Doing the banging earlier fails if the caller frame is not an interpreter
// frame.
// (Also, the exception throwing code expects to unlock any synchronized
// method receiever, so do the banging after locking the receiver.)
// Bang each page in the shadow zone. We can't assume it's been done for
// an interpreter frame with greater than a page of locals, so each page
// needs to be checked. Only true for non-native.
if (UseStackBanging) {
const int page_size = os::vm_page_size();
const int n_shadow_pages = ((int)JavaThread::stack_shadow_zone_size()) / page_size;
const int start_page = native_call ? n_shadow_pages : 1;
for (int pages = start_page; pages <= n_shadow_pages; pages++) {
__ bang_stack_with_offset(pages*page_size);
}
}
}
// 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 || LogTouchedMethods;
// rbx: Method*
// rbcp: sender sp
address entry_point = __ pc();
const Address constMethod (rbx, Method::const_offset());
const Address access_flags (rbx, Method::access_flags_offset());
const Address size_of_parameters(rcx, ConstMethod::
size_of_parameters_offset());
// get parameter size (always needed)
__ movptr(rcx, constMethod);
__ load_unsigned_short(rcx, 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
// rbx: Method*
// rcx: size of parameters
// rbcp: sender sp
__ pop(rax); // get return address
// for natives the size of locals is zero
// compute beginning of parameters
__ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
// add 2 zero-initialized slots for native calls
// initialize result_handler slot
__ push((int) NULL_WORD);
// slot for oop temp
// (static native method holder mirror/jni oop result)
__ push((int) NULL_WORD);
// initialize fixed part of activation frame
generate_fixed_frame(true);
// make sure method is native & not abstract
#ifdef ASSERT
__ movl(rax, access_flags);
{
Label L;
__ testl(rax, JVM_ACC_NATIVE);
__ jcc(Assembler::notZero, L);
__ stop("tried to execute non-native method as native");
__ bind(L);
}
{
Label L;
__ testl(rax, JVM_ACC_ABSTRACT);
__ jcc(Assembler::zero, L);
__ stop("tried to execute abstract method in interpreter");
__ bind(L);
}
#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 Register thread1 = NOT_LP64(rax) LP64_ONLY(r15_thread);
NOT_LP64(__ get_thread(thread1));
const Address do_not_unlock_if_synchronized(thread1,
in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
__ movbool(do_not_unlock_if_synchronized, true);
// increment invocation count & check for overflow
Label invocation_counter_overflow;
if (inc_counter) {
generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
}
Label continue_after_compile;
__ bind(continue_after_compile);
bang_stack_shadow_pages(true);
// reset the _do_not_unlock_if_synchronized flag
NOT_LP64(__ get_thread(thread1));
__ movbool(do_not_unlock_if_synchronized, false);
// 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
{
Label L;
__ movl(rax, access_flags);
__ testl(rax, JVM_ACC_SYNCHRONIZED);
__ jcc(Assembler::zero, L);
__ stop("method needs synchronization");
__ bind(L);
}
#endif
}
// start execution
#ifdef ASSERT
{
Label L;
const Address monitor_block_top(rbp,
frame::interpreter_frame_monitor_block_top_offset * wordSize);
__ movptr(rax, monitor_block_top);
__ cmpptr(rax, rsp);
__ jcc(Assembler::equal, L);
__ stop("broken stack frame setup in interpreter");
__ bind(L);
}
#endif
// jvmti support
__ notify_method_entry();
// work registers
const Register method = rbx;
const Register thread = NOT_LP64(rdi) LP64_ONLY(r15_thread);
const Register t = NOT_LP64(rcx) LP64_ONLY(r11);
// allocate space for parameters
__ get_method(method);
__ movptr(t, Address(method, Method::const_offset()));
__ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset()));
#ifndef _LP64
__ shlptr(t, Interpreter::logStackElementSize); // Convert parameter count to bytes.
__ addptr(t, 2*wordSize); // allocate two more slots for JNIEnv and possible mirror
__ subptr(rsp, t);
__ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics
#else
__ shll(t, Interpreter::logStackElementSize);
__ subptr(rsp, t);
__ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
__ andptr(rsp, -16); // must be 16 byte boundary (see amd64 ABI)
#endif // _LP64
// get signature handler
{
Label L;
__ movptr(t, Address(method, Method::signature_handler_offset()));
__ testptr(t, t);
__ jcc(Assembler::notZero, L);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::prepare_native_call),
method);
__ get_method(method);
__ movptr(t, Address(method, Method::signature_handler_offset()));
__ bind(L);
}
// call signature handler
assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rlocals,
"adjust this code");
assert(InterpreterRuntime::SignatureHandlerGenerator::to() == rsp,
"adjust this code");
assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == NOT_LP64(t) LP64_ONLY(rscratch1),
"adjust this code");
// The generated handlers do not touch RBX (the method oop).
// 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.
__ call(t);
__ get_method(method); // slow path can do a GC, reload RBX
// result handler is in rax
// set result handler
__ movptr(Address(rbp,
(frame::interpreter_frame_result_handler_offset) * wordSize),
rax);
// pass mirror handle if static call
{
Label L;
__ movl(t, Address(method, Method::access_flags_offset()));
__ testl(t, JVM_ACC_STATIC);
__ jcc(Assembler::zero, L);
// get mirror
__ load_mirror(t, method, rax);
// copy mirror into activation frame
__ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize),
t);
// pass handle to mirror
#ifndef _LP64
__ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
__ movptr(Address(rsp, wordSize), t);
#else
__ lea(c_rarg1,
Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
#endif // _LP64
__ bind(L);
}
// get native function entry point
{
Label L;
__ movptr(rax, Address(method, Method::native_function_offset()));
ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
__ cmpptr(rax, unsatisfied.addr());
__ jcc(Assembler::notEqual, L);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::prepare_native_call),
method);
__ get_method(method);
__ movptr(rax, Address(method, Method::native_function_offset()));
__ bind(L);
}
// pass JNIEnv
#ifndef _LP64
__ get_thread(thread);
__ lea(t, Address(thread, JavaThread::jni_environment_offset()));
__ movptr(Address(rsp, 0), t);
// set_last_Java_frame_before_call
// It is enough that the pc()
// points into the right code segment. It does not have to be the correct return pc.
__ set_last_Java_frame(thread, noreg, rbp, __ pc());
#else
__ lea(c_rarg0, Address(r15_thread, 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.
__ set_last_Java_frame(rsp, rbp, (address) __ pc());
#endif // _LP64
// change thread state
#ifdef ASSERT
{
Label L;
__ movl(t, Address(thread, JavaThread::thread_state_offset()));
__ cmpl(t, _thread_in_Java);
__ jcc(Assembler::equal, L);
__ stop("Wrong thread state in native stub");
__ bind(L);
}
#endif
// Change state to native
__ movl(Address(thread, JavaThread::thread_state_offset()),
_thread_in_native);
// Call the native method.
__ call(rax);
// 32: result potentially in rdx:rax or ST0
// 64: result potentially in rax or xmm0
// Verify or restore cpu control state after JNI call
__ restore_cpu_control_state_after_jni();
// 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.
#ifndef _LP64
// save potential result in ST(0) & rdx:rax
// (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 -
// the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers)
// It is safe to do this push because state is _thread_in_native and return address will be found
// via _last_native_pc and not via _last_jave_sp
// NOTE: the order of theses push(es) is known to frame::interpreter_frame_result.
// If the order changes or anything else is added to the stack the code in
// interpreter_frame_result will have to be changed.
{ Label L;
Label push_double;
ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));
ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));
__ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
float_handler.addr());
__ jcc(Assembler::equal, push_double);
__ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
double_handler.addr());
__ jcc(Assembler::notEqual, L);
__ bind(push_double);
__ push_d(); // FP values are returned using the FPU, so push FPU contents (even if UseSSE > 0).
__ bind(L);
}
#else
__ push(dtos);
#endif // _LP64
__ push(ltos);
// change thread state
NOT_LP64(__ get_thread(thread));
__ movl(Address(thread, JavaThread::thread_state_offset()),
_thread_in_native_trans);
// Force this write out before the read below
__ membar(Assembler::Membar_mask_bits(
Assembler::LoadLoad | Assembler::LoadStore |
Assembler::StoreLoad | Assembler::StoreStore));
#ifndef _LP64
if (AlwaysRestoreFPU) {
// Make sure the control word is correct.
__ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));
}
#endif // _LP64
// check for safepoint operation in progress and/or pending suspend requests
{
Label Continue;
Label slow_path;
#ifndef _LP64
__ safepoint_poll(slow_path, thread, noreg);
#else
__ safepoint_poll(slow_path, r15_thread, rscratch1);
#endif
__ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);
__ jcc(Assembler::equal, Continue);
__ bind(slow_path);
// 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. Also can't use
// call_VM_leaf either as it will check to see if r13 & r14 are
// preserved and correspond to the bcp/locals pointers. So we do a
// runtime call by hand.
//
#ifndef _LP64
__ push(thread);
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address,
JavaThread::check_special_condition_for_native_trans)));
__ increment(rsp, wordSize);
__ get_thread(thread);
#else
__ mov(c_rarg0, r15_thread);
__ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
__ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
__ andptr(rsp, -16); // align stack as required by ABI
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
__ mov(rsp, r12); // restore sp
__ reinit_heapbase();
#endif // _LP64
__ bind(Continue);
}
// change thread state
__ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java);
// reset_last_Java_frame
__ reset_last_Java_frame(thread, true);
if (CheckJNICalls) {
// clear_pending_jni_exception_check
__ movptr(Address(thread, JavaThread::pending_jni_exception_check_fn_offset()), NULL_WORD);
}
// reset handle block
__ movptr(t, Address(thread, JavaThread::active_handles_offset()));
__ movl(Address(t, JNIHandleBlock::top_offset_in_bytes()), (int32_t)NULL_WORD);
// 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;
__ lea(t, ExternalAddress(AbstractInterpreter::result_handler(T_OBJECT)));
__ cmpptr(t, Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize));
__ jcc(Assembler::notEqual, no_oop);
// retrieve result
__ pop(ltos);
// Unbox oop result, e.g. JNIHandles::resolve value.
__ resolve_jobject(rax /* value */,
thread /* thread */,
t /* tmp */);
__ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize), rax);
// keep stack depth as expected by pushing oop which will eventually be discarded
__ push(ltos);
__ bind(no_oop);
}
{
Label no_reguard;
__ cmpl(Address(thread, JavaThread::stack_guard_state_offset()),
JavaThread::stack_guard_yellow_reserved_disabled);
__ jcc(Assembler::notEqual, no_reguard);
__ pusha(); // XXX only save smashed registers
#ifndef _LP64
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
__ popa();
#else
__ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
__ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
__ andptr(rsp, -16); // align stack as required by ABI
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
__ mov(rsp, r12); // restore sp
__ popa(); // XXX only restore smashed registers
__ reinit_heapbase();
#endif // _LP64
__ 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(method);
// restore to have legal interpreter frame, i.e., bci == 0 <=> code_base()
__ movptr(rbcp, Address(method, Method::const_offset())); // get ConstMethod*
__ lea(rbcp, Address(rbcp, ConstMethod::codes_offset())); // get codebase
// handle exceptions (exception handling will handle unlocking!)
{
Label L;
__ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);
__ jcc(Assembler::zero, 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 rsp 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;
__ movl(t, Address(method, Method::access_flags_offset()));
__ testl(t, JVM_ACC_SYNCHRONIZED);
__ jcc(Assembler::zero, 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.
const Address monitor(rbp,
(intptr_t)(frame::interpreter_frame_initial_sp_offset *
wordSize - (int)sizeof(BasicObjectLock)));
const Register regmon = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
// monitor expect in c_rarg1 for slow unlock path
__ lea(regmon, monitor); // address of first monitor
__ movptr(t, Address(regmon, BasicObjectLock::obj_offset_in_bytes()));
__ testptr(t, t);
__ jcc(Assembler::notZero, 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(regmon);
}
__ 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);
// restore potential result in edx:eax, call result handler to
// restore potential result in ST0 & handle result
__ pop(ltos);
LP64_ONLY( __ pop(dtos));
__ movptr(t, Address(rbp,
(frame::interpreter_frame_result_handler_offset) * wordSize));
__ call(t);
// remove activation
__ movptr(t, Address(rbp,
frame::interpreter_frame_sender_sp_offset *
wordSize)); // get sender sp
__ leave(); // remove frame anchor
__ pop(rdi); // get return address
__ mov(rsp, t); // set sp to sender sp
__ jmp(rdi);
if (inc_counter) {
// Handle overflow of counter and compile method
__ bind(invocation_counter_overflow);
generate_counter_overflow(continue_after_compile);
}
return entry_point;
}
// Abstract method entry
// Attempt to execute abstract method. Throw exception
address TemplateInterpreterGenerator::generate_abstract_entry(void) {
address entry_point = __ pc();
// abstract method entry
// pop return address, reset last_sp to NULL
__ empty_expression_stack();
__ restore_bcp(); // rsi 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), rbx);
// the call_VM checks for exception, so we should never return here.
__ should_not_reach_here();
return entry_point;
}
//
// Generic interpreted method entry to (asm) interpreter
//
address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
// determine code generation flags
bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
// ebx: Method*
// rbcp: sender sp
address entry_point = __ pc();
const Address constMethod(rbx, Method::const_offset());
const Address access_flags(rbx, Method::access_flags_offset());
const Address size_of_parameters(rdx,
ConstMethod::size_of_parameters_offset());
const Address size_of_locals(rdx, ConstMethod::size_of_locals_offset());
// get parameter size (always needed)
__ movptr(rdx, constMethod);
__ load_unsigned_short(rcx, size_of_parameters);
// rbx: Method*
// rcx: size of parameters
// rbcp: sender_sp (could differ from sp+wordSize if we were called via c2i )
__ load_unsigned_short(rdx, size_of_locals); // get size of locals in words
__ subl(rdx, rcx); // rdx = no. of additional locals
// YYY
// __ incrementl(rdx);
// __ andl(rdx, -2);
// see if we've got enough room on the stack for locals plus overhead.
generate_stack_overflow_check();
// get return address
__ pop(rax);
// compute beginning of parameters
__ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
// rdx - # of additional locals
// allocate space for locals
// explicitly initialize locals
{
Label exit, loop;
__ testl(rdx, rdx);
__ jcc(Assembler::lessEqual, exit); // do nothing if rdx <= 0
__ bind(loop);
__ push((int) NULL_WORD); // initialize local variables
__ decrementl(rdx); // until everything initialized
__ jcc(Assembler::greater, loop);
__ bind(exit);
}
// initialize fixed part of activation frame
generate_fixed_frame(false);
// make sure method is not native & not abstract
#ifdef ASSERT
__ movl(rax, access_flags);
{
Label L;
__ testl(rax, JVM_ACC_NATIVE);
__ jcc(Assembler::zero, L);
__ stop("tried to execute native method as non-native");
__ bind(L);
}
{
Label L;
__ testl(rax, JVM_ACC_ABSTRACT);
__ jcc(Assembler::zero, L);
__ stop("tried to execute abstract method in interpreter");
__ bind(L);
}
#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 Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread);
NOT_LP64(__ get_thread(thread));
const Address do_not_unlock_if_synchronized(thread,
in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
__ movbool(do_not_unlock_if_synchronized, true);
__ profile_parameters_type(rax, rcx, rdx);
// increment invocation count & check for overflow
Label invocation_counter_overflow;
Label profile_method;
Label profile_method_continue;
if (inc_counter) {
generate_counter_incr(&invocation_counter_overflow,
&profile_method,
&profile_method_continue);
if (ProfileInterpreter) {
__ bind(profile_method_continue);
}
}
Label continue_after_compile;
__ bind(continue_after_compile);
// check for synchronized interpreted methods
bang_stack_shadow_pages(false);
// reset the _do_not_unlock_if_synchronized flag
NOT_LP64(__ get_thread(thread));
__ movbool(do_not_unlock_if_synchronized, false);
// 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
{
Label L;
__ movl(rax, access_flags);
__ testl(rax, JVM_ACC_SYNCHRONIZED);
__ jcc(Assembler::zero, L);
__ stop("method needs synchronization");
__ bind(L);
}
#endif
}
// start execution
#ifdef ASSERT
{
Label L;
const Address monitor_block_top (rbp,
frame::interpreter_frame_monitor_block_top_offset * wordSize);
__ movptr(rax, monitor_block_top);
__ cmpptr(rax, rsp);
__ jcc(Assembler::equal, L);
__ stop("broken stack frame setup in interpreter");
__ bind(L);
}
#endif
// jvmti support
__ notify_method_entry();
__ dispatch_next(vtos);
// invocation counter overflow
if (inc_counter) {
if (ProfileInterpreter) {
// We have decided to profile this method in the interpreter
__ bind(profile_method);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
__ set_method_data_pointer_for_bcp();
__ get_method(rbx);
__ jmp(profile_method_continue);
}
// Handle overflow of counter and compile method
__ bind(invocation_counter_overflow);
generate_counter_overflow(continue_after_compile);
}
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.
__ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
// rax: exception
// rdx: return address/pc that threw exception
__ restore_bcp(); // r13/rsi points to call/send
__ restore_locals();
LP64_ONLY(__ reinit_heapbase()); // restore r12 as heapbase.
// Entry point for exceptions thrown within interpreter code
Interpreter::_throw_exception_entry = __ pc();
// expression stack is undefined here
// rax: exception
// r13/rsi: exception bcp
__ verify_oop(rax);
Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
LP64_ONLY(__ mov(c_rarg1, rax));
// 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(rdx,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::exception_handler_for_exception),
rarg);
// rax: exception handler entry point
// rdx: preserved exception oop
// r13/rsi: bcp for exception handler
__ push_ptr(rdx); // push exception which is now the only value on the stack
__ jmp(rax); // 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).
// In current activation
// tos: exception
// esi: exception bcp
//
// 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.
const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
NOT_LP64(__ get_thread(thread));
__ movl(rdx, Address(thread, JavaThread::popframe_condition_offset()));
__ orl(rdx, JavaThread::popframe_processing_bit);
__ movl(Address(thread, JavaThread::popframe_condition_offset()), rdx);
{
// 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;
Register rarg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
__ movptr(rarg, Address(rbp, frame::return_addr_offset * wordSize));
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
InterpreterRuntime::interpreter_contains), rarg);
__ testl(rax, rax);
__ jcc(Assembler::notZero, caller_not_deoptimized);
// Compute size of arguments for saving when returning to
// deoptimized caller
__ get_method(rax);
__ movptr(rax, Address(rax, Method::const_offset()));
__ load_unsigned_short(rax, Address(rax, in_bytes(ConstMethod::
size_of_parameters_offset())));
__ shll(rax, Interpreter::logStackElementSize);
__ restore_locals();
__ subptr(rlocals, rax);
__ addptr(rlocals, wordSize);
// Save these arguments
NOT_LP64(__ get_thread(thread));
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
Deoptimization::
popframe_preserve_args),
thread, rax, rlocals);
__ remove_activation(vtos, rdx,
/* throw_monitor_exception */ false,
/* install_monitor_exception */ false,
/* notify_jvmdi */ false);
// Inform deoptimization that it is responsible for restoring
// these arguments
NOT_LP64(__ get_thread(thread));
__ movl(Address(thread, JavaThread::popframe_condition_offset()),
JavaThread::popframe_force_deopt_reexecution_bit);
// Continue in deoptimization handler
__ jmp(rdx);
__ bind(caller_not_deoptimized);
}
__ remove_activation(vtos, rdx, /* rdx result (retaddr) is not used */
/* throw_monitor_exception */ false,
/* install_monitor_exception */ false,
/* notify_jvmdi */ false);
// Finish with popframe handling
// A previous I2C followed by a deoptimization might have moved the
// outgoing arguments further up the stack. PopFrame expects the
// mutations to those outgoing arguments to be preserved and other
// constraints basically require this frame to look exactly as
// though it had previously invoked an interpreted activation with
// no space between the top of the expression stack (current
// last_sp) and the top of stack. Rather than force deopt to
// maintain this kind of invariant all the time we call a small
// fixup routine to move the mutated arguments onto the top of our
// expression stack if necessary.
#ifndef _LP64
__ mov(rax, rsp);
__ movptr(rbx, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
__ get_thread(thread);
// PC must point into interpreter here
__ set_last_Java_frame(thread, noreg, rbp, __ pc());
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), thread, rax, rbx);
__ get_thread(thread);
#else
__ mov(c_rarg1, rsp);
__ movptr(c_rarg2, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
// PC must point into interpreter here
__ set_last_Java_frame(noreg, rbp, __ pc());
__ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), r15_thread, c_rarg1, c_rarg2);
#endif
__ reset_last_Java_frame(thread, true);
// Restore the last_sp and null it out
__ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
__ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
__ restore_bcp();
__ restore_locals();
// 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
NOT_LP64(__ get_thread(thread));
__ movl(Address(thread, JavaThread::popframe_condition_offset()),
JavaThread::popframe_inactive);
#if INCLUDE_JVMTI
{
Label L_done;
const Register local0 = rlocals;
__ cmpb(Address(rbcp, 0), Bytecodes::_invokestatic);
__ jcc(Assembler::notEqual, 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.
__ get_method(rdx);
__ movptr(rax, Address(local0, 0));
__ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), rax, rdx, rbcp);
__ testptr(rax, rax);
__ jcc(Assembler::zero, L_done);
__ movptr(Address(rbx, 0), rax);
__ bind(L_done);
}
#endif // INCLUDE_JVMTI
__ dispatch_next(vtos);
// end of PopFrame support
Interpreter::_remove_activation_entry = __ pc();
// preserve exception over this code sequence
__ pop_ptr(rax);
NOT_LP64(__ get_thread(thread));
__ movptr(Address(thread, JavaThread::vm_result_offset()), rax);
// remove the activation (without doing throws on illegalMonitorExceptions)
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