/*
* Copyright (c) 2018, Red Hat, Inc. All rights reserved.
*
* 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 "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
#include "gc/shenandoah/shenandoahHeap.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.hpp"
#include "gc/shenandoah/shenandoahHeuristics.hpp"
#include "gc/shenandoah/shenandoahRuntime.hpp"
#include "gc/shenandoah/shenandoahThreadLocalData.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interp_masm.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/thread.hpp"
#include "utilities/macros.hpp"
#ifdef COMPILER1
#include "c1/c1_LIRAssembler.hpp"
#include "c1/c1_MacroAssembler.hpp"
#include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
#endif
#define __ masm->
address ShenandoahBarrierSetAssembler::_shenandoah_wb = NULL;
void ShenandoahBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Register src, Register dst, Register count) {
bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;
bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;
bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
bool dest_uninitialized = (decorators & IS_DEST_UNINITIALIZED) != 0;
if (type == T_OBJECT || type == T_ARRAY) {
#ifdef _LP64
if (!checkcast && !obj_int) {
// Save count for barrier
__ movptr(r11, count);
} else if (disjoint && obj_int) {
// Save dst in r11 in the disjoint case
__ movq(r11, dst);
}
#else
if (disjoint) {
__ mov(rdx, dst); // save 'to'
}
#endif
if (!dest_uninitialized && !ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc()) {
Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread);
#ifndef _LP64
__ push(thread);
__ get_thread(thread);
#endif
Label filtered;
Address in_progress(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_active_offset()));
// Is marking active?
if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
__ cmpl(in_progress, 0);
} else {
assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
__ cmpb(in_progress, 0);
}
NOT_LP64(__ pop(thread);)
__ jcc(Assembler::equal, filtered);
__ pusha(); // push registers
#ifdef _LP64
if (count == c_rarg0) {
if (dst == c_rarg1) {
// exactly backwards!!
__ xchgptr(c_rarg1, c_rarg0);
} else {
__ movptr(c_rarg1, count);
__ movptr(c_rarg0, dst);
}
} else {
__ movptr(c_rarg0, dst);
__ movptr(c_rarg1, count);
}
if (UseCompressedOops) {
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_array_pre_narrow_oop_entry), 2);
} else {
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_array_pre_oop_entry), 2);
}
#else
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_array_pre_oop_entry),
dst, count);
#endif
__ popa();
__ bind(filtered);
}
}
}
void ShenandoahBarrierSetAssembler::arraycopy_epilogue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Register src, Register dst, Register count) {
bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;
bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;
bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
Register tmp = rax;
if (type == T_OBJECT || type == T_ARRAY) {
#ifdef _LP64
if (!checkcast && !obj_int) {
// Save count for barrier
count = r11;
} else if (disjoint && obj_int) {
// Use the saved dst in the disjoint case
dst = r11;
} else if (checkcast) {
tmp = rscratch1;
}
#else
if (disjoint) {
__ mov(dst, rdx); // restore 'to'
}
#endif
__ pusha(); // push registers (overkill)
#ifdef _LP64
if (c_rarg0 == count) { // On win64 c_rarg0 == rcx
assert_different_registers(c_rarg1, dst);
__ mov(c_rarg1, count);
__ mov(c_rarg0, dst);
} else {
assert_different_registers(c_rarg0, count);
__ mov(c_rarg0, dst);
__ mov(c_rarg1, count);
}
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_array_post_entry), 2);
#else
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_array_post_entry),
dst, count);
#endif
__ popa();
}
}
void ShenandoahBarrierSetAssembler::shenandoah_write_barrier_pre(MacroAssembler* masm,
Register obj,
Register pre_val,
Register thread,
Register tmp,
bool tosca_live,
bool expand_call) {
if (ShenandoahSATBBarrier) {
satb_write_barrier_pre(masm, obj, pre_val, thread, tmp, tosca_live, expand_call);
}
}
void ShenandoahBarrierSetAssembler::satb_write_barrier_pre(MacroAssembler* masm,
Register obj,
Register pre_val,
Register thread,
Register tmp,
bool tosca_live,
bool expand_call) {
// If expand_call is true then we expand the call_VM_leaf macro
// directly to skip generating the check by
// InterpreterMacroAssembler::call_VM_leaf_base that checks _last_sp.
#ifdef _LP64
assert(thread == r15_thread, "must be");
#endif // _LP64
Label done;
Label runtime;
assert(pre_val != noreg, "check this code");
if (obj != noreg) {
assert_different_registers(obj, pre_val, tmp);
assert(pre_val != rax, "check this code");
}
Address in_progress(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_active_offset()));
Address index(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_index_offset()));
Address buffer(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset()));
Address gc_state(thread, in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
__ testb(gc_state, ShenandoahHeap::MARKING | ShenandoahHeap::TRAVERSAL);
__ jcc(Assembler::zero, done);
// Do we need to load the previous value?
if (obj != noreg) {
__ load_heap_oop(pre_val, Address(obj, 0), noreg, noreg, AS_RAW);
}
// Is the previous value null?
__ cmpptr(pre_val, (int32_t) NULL_WORD);
__ jcc(Assembler::equal, done);
// Can we store original value in the thread's buffer?
// Is index == 0?
// (The index field is typed as size_t.)
__ movptr(tmp, index); // tmp := *index_adr
__ cmpptr(tmp, 0); // tmp == 0?
__ jcc(Assembler::equal, runtime); // If yes, goto runtime
__ subptr(tmp, wordSize); // tmp := tmp - wordSize
__ movptr(index, tmp); // *index_adr := tmp
__ addptr(tmp, buffer); // tmp := tmp + *buffer_adr
// Record the previous value
__ movptr(Address(tmp, 0), pre_val);
__ jmp(done);
__ bind(runtime);
// save the live input values
if(tosca_live) __ push(rax);
if (obj != noreg && obj != rax)
__ push(obj);
if (pre_val != rax)
__ push(pre_val);
// Calling the runtime using the regular call_VM_leaf mechanism generates
// code (generated by InterpreterMacroAssember::call_VM_leaf_base)
// that checks that the *(ebp+frame::interpreter_frame_last_sp) == NULL.
//
// If we care generating the pre-barrier without a frame (e.g. in the
// intrinsified Reference.get() routine) then ebp might be pointing to
// the caller frame and so this check will most likely fail at runtime.
//
// Expanding the call directly bypasses the generation of the check.
// So when we do not have have a full interpreter frame on the stack
// expand_call should be passed true.
NOT_LP64( __ push(thread); )
#ifdef _LP64
// We move pre_val into c_rarg0 early, in order to avoid smashing it, should
// pre_val be c_rarg1 (where the call prologue would copy thread argument).
// Note: this should not accidentally smash thread, because thread is always r15.
assert(thread != c_rarg0, "smashed arg");
if (c_rarg0 != pre_val) {
__ mov(c_rarg0, pre_val);
}
#endif
if (expand_call) {
LP64_ONLY( assert(pre_val != c_rarg1, "smashed arg"); )
#ifdef _LP64
if (c_rarg1 != thread) {
__ mov(c_rarg1, thread);
}
// Already moved pre_val into c_rarg0 above
#else
__ push(thread);
__ push(pre_val);
#endif
__ MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_field_pre_entry), 2);
} else {
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_field_pre_entry), LP64_ONLY(c_rarg0) NOT_LP64(pre_val), thread);
}
NOT_LP64( __ pop(thread); )
// save the live input values
if (pre_val != rax)
__ pop(pre_val);
if (obj != noreg && obj != rax)
__ pop(obj);
if(tosca_live) __ pop(rax);
__ bind(done);
}
void ShenandoahBarrierSetAssembler::read_barrier(MacroAssembler* masm, Register dst) {
if (ShenandoahReadBarrier) {
read_barrier_impl(masm, dst);
}
}
void ShenandoahBarrierSetAssembler::read_barrier_impl(MacroAssembler* masm, Register dst) {
assert(UseShenandoahGC && (ShenandoahReadBarrier || ShenandoahStoreValReadBarrier || ShenandoahCASBarrier), "should be enabled");
Label is_null;
__ testptr(dst, dst);
__ jcc(Assembler::zero, is_null);
read_barrier_not_null_impl(masm, dst);
__ bind(is_null);
}
void ShenandoahBarrierSetAssembler::read_barrier_not_null(MacroAssembler* masm, Register dst) {
if (ShenandoahReadBarrier) {
read_barrier_not_null_impl(masm, dst);
}
}
void ShenandoahBarrierSetAssembler::read_barrier_not_null_impl(MacroAssembler* masm, Register dst) {
assert(UseShenandoahGC && (ShenandoahReadBarrier || ShenandoahStoreValReadBarrier || ShenandoahCASBarrier), "should be enabled");
__ movptr(dst, Address(dst, ShenandoahBrooksPointer::byte_offset()));
}
void ShenandoahBarrierSetAssembler::write_barrier(MacroAssembler* masm, Register dst) {
if (ShenandoahWriteBarrier) {
write_barrier_impl(masm, dst);
}
}
void ShenandoahBarrierSetAssembler::write_barrier_impl(MacroAssembler* masm, Register dst) {
assert(UseShenandoahGC && (ShenandoahWriteBarrier || ShenandoahStoreValEnqueueBarrier), "Should be enabled");
#ifdef _LP64
Label done;
Address gc_state(r15_thread, in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
__ testb(gc_state, ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::EVACUATION | ShenandoahHeap::TRAVERSAL);
__ jccb(Assembler::zero, done);
// Heap is unstable, need to perform the read-barrier even if WB is inactive
read_barrier_not_null(masm, dst);
__ testb(gc_state, ShenandoahHeap::EVACUATION | ShenandoahHeap::TRAVERSAL);
__ jccb(Assembler::zero, done);
if (dst != rax) {
__ xchgptr(dst, rax); // Move obj into rax and save rax into obj.
}
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, ShenandoahBarrierSetAssembler::shenandoah_wb())));
if (dst != rax) {
__ xchgptr(rax, dst); // Swap back obj with rax.
}
__ bind(done);
#else
Unimplemented();
#endif
}
void ShenandoahBarrierSetAssembler::storeval_barrier(MacroAssembler* masm, Register dst, Register tmp) {
if (ShenandoahStoreValReadBarrier || ShenandoahStoreValEnqueueBarrier) {
storeval_barrier_impl(masm, dst, tmp);
}
}
void ShenandoahBarrierSetAssembler::storeval_barrier_impl(MacroAssembler* masm, Register dst, Register tmp) {
assert(UseShenandoahGC && (ShenandoahStoreValReadBarrier || ShenandoahStoreValEnqueueBarrier), "should be enabled");
if (dst == noreg) return;
#ifdef _LP64
if (ShenandoahStoreValEnqueueBarrier) {
Label is_null;
__ testptr(dst, dst);
__ jcc(Assembler::zero, is_null);
write_barrier_impl(masm, dst);
__ bind(is_null);
// The set of registers to be saved+restored is the same as in the write-barrier above.
// Those are the commonly used registers in the interpreter.
__ pusha();
// __ push_callee_saved_registers();
__ subptr(rsp, 2 * Interpreter::stackElementSize);
__ movdbl(Address(rsp, 0), xmm0);
satb_write_barrier_pre(masm, noreg, dst, r15_thread, tmp, true, false);
__ movdbl(xmm0, Address(rsp, 0));
__ addptr(rsp, 2 * Interpreter::stackElementSize);
//__ pop_callee_saved_registers();
__ popa();
}
if (ShenandoahStoreValReadBarrier) {
read_barrier_impl(masm, dst);
}
#else
Unimplemented();
#endif
}
void ShenandoahBarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Register dst, Address src, Register tmp1, Register tmp_thread) {
bool on_oop = type == T_OBJECT || type == T_ARRAY;
bool in_heap = (decorators & IN_HEAP) != 0;
bool on_weak = (decorators & ON_WEAK_OOP_REF) != 0;
bool on_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0;
bool on_reference = on_weak || on_phantom;
if (in_heap) {
read_barrier_not_null(masm, src.base());
}
BarrierSetAssembler::load_at(masm, decorators, type, dst, src, tmp1, tmp_thread);
if (ShenandoahKeepAliveBarrier && on_oop && on_reference) {
const Register thread = NOT_LP64(tmp_thread) LP64_ONLY(r15_thread);
NOT_LP64(__ get_thread(thread));
// Generate the SATB pre-barrier code to log the value of
// the referent field in an SATB buffer.
shenandoah_write_barrier_pre(masm /* masm */,
noreg /* obj */,
dst /* pre_val */,
thread /* thread */,
tmp1 /* tmp */,
true /* tosca_live */,
true /* expand_call */);
}
}
void ShenandoahBarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Address dst, Register val, Register tmp1, Register tmp2) {
bool in_heap = (decorators & IN_HEAP) != 0;
bool as_normal = (decorators & AS_NORMAL) != 0;
if (in_heap) {
write_barrier(masm, dst.base());
}
if (type == T_OBJECT || type == T_ARRAY) {
bool needs_pre_barrier = as_normal;
Register tmp3 = LP64_ONLY(r8) NOT_LP64(rsi);
Register rthread = LP64_ONLY(r15_thread) NOT_LP64(rcx);
// flatten object address if needed
// We do it regardless of precise because we need the registers
if (dst.index() == noreg && dst.disp() == 0) {
if (dst.base() != tmp1) {
__ movptr(tmp1, dst.base());
}
} else {
__ lea(tmp1, dst);
}
#ifndef _LP64
InterpreterMacroAssembler *imasm = static_cast<InterpreterMacroAssembler*>(masm);
#endif
NOT_LP64(__ get_thread(rcx));
NOT_LP64(imasm->save_bcp());
if (needs_pre_barrier) {
shenandoah_write_barrier_pre(masm /*masm*/,
tmp1 /* obj */,
tmp2 /* pre_val */,
rthread /* thread */,
tmp3 /* tmp */,
val != noreg /* tosca_live */,
false /* expand_call */);
}
if (val == noreg) {
BarrierSetAssembler::store_at(masm, decorators, type, Address(tmp1, 0), val, noreg, noreg);
} else {
storeval_barrier(masm, val, tmp3);
BarrierSetAssembler::store_at(masm, decorators, type, Address(tmp1, 0), val, noreg, noreg);
}
NOT_LP64(imasm->restore_bcp());
} else {
BarrierSetAssembler::store_at(masm, decorators, type, dst, val, tmp1, tmp2);
}
}
#ifndef _LP64
void ShenandoahBarrierSetAssembler::obj_equals(MacroAssembler* masm,
Address obj1, jobject obj2) {
Unimplemented();
}
void ShenandoahBarrierSetAssembler::obj_equals(MacroAssembler* masm,
Register obj1, jobject obj2) {
Unimplemented();
}
#endif
void ShenandoahBarrierSetAssembler::obj_equals(MacroAssembler* masm, Register op1, Register op2) {
__ cmpptr(op1, op2);
if (ShenandoahAcmpBarrier) {
Label done;
__ jccb(Assembler::equal, done);
read_barrier(masm, op1);
read_barrier(masm, op2);
__ cmpptr(op1, op2);
__ bind(done);
}
}
void ShenandoahBarrierSetAssembler::obj_equals(MacroAssembler* masm, Register src1, Address src2) {
__ cmpptr(src1, src2);
if (ShenandoahAcmpBarrier) {
Label done;
__ jccb(Assembler::equal, done);
__ movptr(rscratch2, src2);
read_barrier(masm, src1);
read_barrier(masm, rscratch2);
__ cmpptr(src1, rscratch2);
__ bind(done);
}
}
void ShenandoahBarrierSetAssembler::tlab_allocate(MacroAssembler* masm,
Register thread, Register obj,
Register var_size_in_bytes,
int con_size_in_bytes,
Register t1, Register t2,
Label& slow_case) {
assert_different_registers(obj, t1, t2);
assert_different_registers(obj, var_size_in_bytes, t1);
Register end = t2;
if (!thread->is_valid()) {
#ifdef _LP64
thread = r15_thread;
#else
assert(t1->is_valid(), "need temp reg");
thread = t1;
__ get_thread(thread);
#endif
}
__ verify_tlab();
__ movptr(obj, Address(thread, JavaThread::tlab_top_offset()));
if (var_size_in_bytes == noreg) {
__ lea(end, Address(obj, con_size_in_bytes + ShenandoahBrooksPointer::byte_size()));
} else {
__ addptr(var_size_in_bytes, ShenandoahBrooksPointer::byte_size());
__ lea(end, Address(obj, var_size_in_bytes, Address::times_1));
}
__ cmpptr(end, Address(thread, JavaThread::tlab_end_offset()));
__ jcc(Assembler::above, slow_case);
// update the tlab top pointer
__ movptr(Address(thread, JavaThread::tlab_top_offset()), end);
// Initialize brooks pointer
#ifdef _LP64
__ incrementq(obj, ShenandoahBrooksPointer::byte_size());
#else
__ incrementl(obj, ShenandoahBrooksPointer::byte_size());
#endif
__ movptr(Address(obj, ShenandoahBrooksPointer::byte_offset()), obj);
// recover var_size_in_bytes if necessary
if (var_size_in_bytes == end) {
__ subptr(var_size_in_bytes, obj);
}
__ verify_tlab();
}
void ShenandoahBarrierSetAssembler::resolve(MacroAssembler* masm, DecoratorSet decorators, Register obj) {
bool oop_not_null = (decorators & IS_NOT_NULL) != 0;
bool is_write = (decorators & ACCESS_WRITE) != 0;
if (is_write) {
if (oop_not_null) {
write_barrier(masm, obj);
} else {
Label done;
__ testptr(obj, obj);
__ jcc(Assembler::zero, done);
write_barrier(masm, obj);
__ bind(done);
}
} else {
if (oop_not_null) {
read_barrier_not_null(masm, obj);
} else {
read_barrier(masm, obj);
}
}
}
// Special Shenandoah CAS implementation that handles false negatives
// due to concurrent evacuation.
#ifndef _LP64
void ShenandoahBarrierSetAssembler::cmpxchg_oop(MacroAssembler* masm,
Register res, Address addr, Register oldval, Register newval,
bool exchange, Register tmp1, Register tmp2) {
// Shenandoah has no 32-bit version for this.
Unimplemented();
}
#else
void ShenandoahBarrierSetAssembler::cmpxchg_oop(MacroAssembler* masm,
Register res, Address addr, Register oldval, Register newval,
bool exchange, Register tmp1, Register tmp2) {
assert(ShenandoahCASBarrier, "Should only be used when CAS barrier is enabled");
assert(oldval == rax, "must be in rax for implicit use in cmpxchg");
Label retry, done;
// Remember oldval for retry logic below
if (UseCompressedOops) {
__ movl(tmp1, oldval);
} else {
__ movptr(tmp1, oldval);
}
// Step 1. Try to CAS with given arguments. If successful, then we are done,
// and can safely return.
if (os::is_MP()) __ lock();
if (UseCompressedOops) {
__ cmpxchgl(newval, addr);
} else {
__ cmpxchgptr(newval, addr);
}
__ jcc(Assembler::equal, done, true);
// Step 2. CAS had failed. This may be a false negative.
//
// The trouble comes when we compare the to-space pointer with the from-space
// pointer to the same object. To resolve this, it will suffice to read both
// oldval and the value from memory through the read barriers -- this will give
// both to-space pointers. If they mismatch, then it was a legitimate failure.
//
if (UseCompressedOops) {
__ decode_heap_oop(tmp1);
}
read_barrier_impl(masm, tmp1);
if (UseCompressedOops) {
__ movl(tmp2, oldval);
__ decode_heap_oop(tmp2);
} else {
__ movptr(tmp2, oldval);
}
read_barrier_impl(masm, tmp2);
__ cmpptr(tmp1, tmp2);
__ jcc(Assembler::notEqual, done, true);
// Step 3. Try to CAS again with resolved to-space pointers.
//
// Corner case: it may happen that somebody stored the from-space pointer
// to memory while we were preparing for retry. Therefore, we can fail again
// on retry, and so need to do this in loop, always re-reading the failure
// witness through the read barrier.
__ bind(retry);
if (os::is_MP()) __ lock();
if (UseCompressedOops) {
__ cmpxchgl(newval, addr);
} else {
__ cmpxchgptr(newval, addr);
}
__ jcc(Assembler::equal, done, true);
if (UseCompressedOops) {
__ movl(tmp2, oldval);
__ decode_heap_oop(tmp2);
} else {
__ movptr(tmp2, oldval);
}
read_barrier_impl(masm, tmp2);
__ cmpptr(tmp1, tmp2);
__ jcc(Assembler::equal, retry, true);
// Step 4. If we need a boolean result out of CAS, check the flag again,
// and promote the result. Note that we handle the flag from both the CAS
// itself and from the retry loop.
__ bind(done);
if (!exchange) {
assert(res != NULL, "need result register");
__ setb(Assembler::equal, res);
__ movzbl(res, res);
}
}
#endif // LP64
void ShenandoahBarrierSetAssembler::save_vector_registers(MacroAssembler* masm) {
int num_xmm_regs = LP64_ONLY(16) NOT_LP64(8);
if (UseAVX > 2) {
num_xmm_regs = LP64_ONLY(32) NOT_LP64(8);
}
if (UseSSE == 1) {
__ subptr(rsp, sizeof(jdouble)*8);
for (int n = 0; n < 8; n++) {
__ movflt(Address(rsp, n*sizeof(jdouble)), as_XMMRegister(n));
}
} else if (UseSSE >= 2) {
if (UseAVX > 2) {
__ push(rbx);
__ movl(rbx, 0xffff);
__ kmovwl(k1, rbx);
__ pop(rbx);
}
#ifdef COMPILER2
if (MaxVectorSize > 16) {
if(UseAVX > 2) {
// Save upper half of ZMM registers
__ subptr(rsp, 32*num_xmm_regs);
for (int n = 0; n < num_xmm_regs; n++) {
__ vextractf64x4_high(Address(rsp, n*32), as_XMMRegister(n));
}
}
assert(UseAVX > 0, "256 bit vectors are supported only with AVX");
// Save upper half of YMM registers
__ subptr(rsp, 16*num_xmm_regs);
for (int n = 0; n < num_xmm_regs; n++) {
__ vextractf128_high(Address(rsp, n*16), as_XMMRegister(n));
}
}
#endif
// Save whole 128bit (16 bytes) XMM registers
__ subptr(rsp, 16*num_xmm_regs);
#ifdef _LP64
if (VM_Version::supports_evex()) {
for (int n = 0; n < num_xmm_regs; n++) {
__ vextractf32x4(Address(rsp, n*16), as_XMMRegister(n), 0);
}
} else {
for (int n = 0; n < num_xmm_regs; n++) {
__ movdqu(Address(rsp, n*16), as_XMMRegister(n));
}
}
#else
for (int n = 0; n < num_xmm_regs; n++) {
__ movdqu(Address(rsp, n*16), as_XMMRegister(n));
}
#endif
}
}
void ShenandoahBarrierSetAssembler::restore_vector_registers(MacroAssembler* masm) {
int num_xmm_regs = LP64_ONLY(16) NOT_LP64(8);
if (UseAVX > 2) {
num_xmm_regs = LP64_ONLY(32) NOT_LP64(8);
}
if (UseSSE == 1) {
for (int n = 0; n < 8; n++) {
__ movflt(as_XMMRegister(n), Address(rsp, n*sizeof(jdouble)));
}
__ addptr(rsp, sizeof(jdouble)*8);
} else if (UseSSE >= 2) {
// Restore whole 128bit (16 bytes) XMM registers
#ifdef _LP64
if (VM_Version::supports_evex()) {
for (int n = 0; n < num_xmm_regs; n++) {
__ vinsertf32x4(as_XMMRegister(n), as_XMMRegister(n), Address(rsp, n*16), 0);
}
} else {
for (int n = 0; n < num_xmm_regs; n++) {
__ movdqu(as_XMMRegister(n), Address(rsp, n*16));
}
}
#else
for (int n = 0; n < num_xmm_regs; n++) {
__ movdqu(as_XMMRegister(n), Address(rsp, n*16));
}
#endif
__ addptr(rsp, 16*num_xmm_regs);
#ifdef COMPILER2
if (MaxVectorSize > 16) {
// Restore upper half of YMM registers.
for (int n = 0; n < num_xmm_regs; n++) {
__ vinsertf128_high(as_XMMRegister(n), Address(rsp, n*16));
}
__ addptr(rsp, 16*num_xmm_regs);
if (UseAVX > 2) {
for (int n = 0; n < num_xmm_regs; n++) {
__ vinsertf64x4_high(as_XMMRegister(n), Address(rsp, n*32));
}
__ addptr(rsp, 32*num_xmm_regs);
}
}
#endif
}
}
#ifdef COMPILER1
#undef __
#define __ ce->masm()->
void ShenandoahBarrierSetAssembler::gen_pre_barrier_stub(LIR_Assembler* ce, ShenandoahPreBarrierStub* stub) {
ShenandoahBarrierSetC1* bs = (ShenandoahBarrierSetC1*)BarrierSet::barrier_set()->barrier_set_c1();
// At this point we know that marking is in progress.
// If do_load() is true then we have to emit the
// load of the previous value; otherwise it has already
// been loaded into _pre_val.
__ bind(*stub->entry());
assert(stub->pre_val()->is_register(), "Precondition.");
Register pre_val_reg = stub->pre_val()->as_register();
if (stub->do_load()) {
ce->mem2reg(stub->addr(), stub->pre_val(), T_OBJECT, stub->patch_code(), stub->info(), false /*wide*/, false /*unaligned*/);
}
__ cmpptr(pre_val_reg, (int32_t)NULL_WORD);
__ jcc(Assembler::equal, *stub->continuation());
ce->store_parameter(stub->pre_val()->as_register(), 0);
__ call(RuntimeAddress(bs->pre_barrier_c1_runtime_code_blob()->code_begin()));
__ jmp(*stub->continuation());
}
void ShenandoahBarrierSetAssembler::gen_write_barrier_stub(LIR_Assembler* ce, ShenandoahWriteBarrierStub* stub) {
__ bind(*stub->entry());
Label done;
Register obj = stub->obj()->as_register();
Register res = stub->result()->as_register();
if (res != obj) {
__ mov(res, obj);
}
// Check for null.
if (stub->needs_null_check()) {
__ testptr(res, res);
__ jcc(Assembler::zero, done);
}
write_barrier(ce->masm(), res);
__ bind(done);
__ jmp(*stub->continuation());
}
#undef __
#define __ sasm->
void ShenandoahBarrierSetAssembler::generate_c1_pre_barrier_runtime_stub(StubAssembler* sasm) {
__ prologue("shenandoah_pre_barrier", false);
// arg0 : previous value of memory
__ push(rax);
__ push(rdx);
const Register pre_val = rax;
const Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread);
const Register tmp = rdx;
NOT_LP64(__ get_thread(thread);)
Address queue_index(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_index_offset()));
Address buffer(thread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset()));
Label done;
Label runtime;
// Is SATB still active?
Address gc_state(thread, in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
__ testb(gc_state, ShenandoahHeap::MARKING | ShenandoahHeap::TRAVERSAL);
__ jcc(Assembler::zero, done);
// Can we store original value in the thread's buffer?
__ movptr(tmp, queue_index);
__ testptr(tmp, tmp);
__ jcc(Assembler::zero, runtime);
__ subptr(tmp, wordSize);
__ movptr(queue_index, tmp);
__ addptr(tmp, buffer);
// prev_val (rax)
__ load_parameter(0, pre_val);
__ movptr(Address(tmp, 0), pre_val);
__ jmp(done);
__ bind(runtime);
__ save_live_registers_no_oop_map(true);
// load the pre-value
__ load_parameter(0, rcx);
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_field_pre_entry), rcx, thread);
__ restore_live_registers(true);
__ bind(done);
__ pop(rdx);
__ pop(rax);
__ epilogue();
}
#undef __
#endif // COMPILER1
address ShenandoahBarrierSetAssembler::shenandoah_wb() {
assert(_shenandoah_wb != NULL, "need write barrier stub");
return _shenandoah_wb;
}
#define __ cgen->assembler()->
address ShenandoahBarrierSetAssembler::generate_shenandoah_wb(StubCodeGenerator* cgen) {
__ align(CodeEntryAlignment);
StubCodeMark mark(cgen, "StubRoutines", "shenandoah_wb");
address start = __ pc();
#ifdef _LP64
Label not_done;
// We use RDI, which also serves as argument register for slow call.
// RAX always holds the src object ptr, except after the slow call and
// the cmpxchg, then it holds the result.
// R8 and RCX are used as temporary registers.
__ push(rdi);
__ push(r8);
// Check for object beeing in the collection set.
// TODO: Can we use only 1 register here?
// The source object arrives here in rax.
// live: rax
// live: rdi
__ mov(rdi, rax);
__ shrptr(rdi, ShenandoahHeapRegion::region_size_bytes_shift_jint());
// live: r8
__ movptr(r8, (intptr_t) ShenandoahHeap::in_cset_fast_test_addr());
__ movbool(r8, Address(r8, rdi, Address::times_1));
// unlive: rdi
__ testbool(r8);
// unlive: r8
__ jccb(Assembler::notZero, not_done);
__ pop(r8);
__ pop(rdi);
__ ret(0);
__ bind(not_done);
__ push(rcx);
__ push(rdx);
__ push(rdi);
__ push(rsi);
__ push(r8);
__ push(r9);
__ push(r10);
__ push(r11);
__ push(r12);
__ push(r13);
__ push(r14);
__ push(r15);
save_vector_registers(cgen->assembler());
__ movptr(rdi, rax);
__ call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_barrier_JRT), rdi);
restore_vector_registers(cgen->assembler());
__ pop(r15);
__ pop(r14);
__ pop(r13);
__ pop(r12);
__ pop(r11);
__ pop(r10);
__ pop(r9);
__ pop(r8);
__ pop(rsi);
__ pop(rdi);
__ pop(rdx);
__ pop(rcx);
__ pop(r8);
__ pop(rdi);
__ ret(0);
#else
ShouldNotReachHere();
#endif
return start;
}
#undef __
void ShenandoahBarrierSetAssembler::barrier_stubs_init() {
if (ShenandoahWriteBarrier || ShenandoahStoreValEnqueueBarrier) {
int stub_code_size = 4096;
ResourceMark rm;
BufferBlob* bb = BufferBlob::create("shenandoah_barrier_stubs", stub_code_size);
CodeBuffer buf(bb);
StubCodeGenerator cgen(&buf);
_shenandoah_wb = generate_shenandoah_wb(&cgen);
}
}