author | pliden |
Thu, 12 Apr 2018 11:22:24 +0200 | |
changeset 49754 | ee93c1087584 |
parent 49753 | 46f2dc7c4c39 |
child 49816 | a3e79f97e86b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "asm/macroAssembler.inline.hpp" |
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#include "gc/g1/g1BarrierSet.hpp" |
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#include "gc/g1/g1BarrierSetAssembler.hpp" |
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#include "gc/g1/g1CardTable.hpp" |
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#include "gc/g1/g1ThreadLocalData.hpp" |
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#include "gc/g1/heapRegion.hpp" |
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#include "interpreter/interp_masm.hpp" |
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#include "runtime/sharedRuntime.hpp" |
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|
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#define __ masm-> |
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|
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void G1BarrierSetAssembler::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators, |
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Register addr, Register count, RegSet saved_regs) { |
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bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0; |
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if (!dest_uninitialized) { |
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__ push(saved_regs, sp); |
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if (count == c_rarg0) { |
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if (addr == c_rarg1) { |
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// exactly backwards!! |
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__ mov(rscratch1, c_rarg0); |
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__ mov(c_rarg0, c_rarg1); |
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__ mov(c_rarg1, rscratch1); |
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} else { |
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__ mov(c_rarg1, count); |
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__ mov(c_rarg0, addr); |
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} |
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} else { |
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__ mov(c_rarg0, addr); |
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__ mov(c_rarg1, count); |
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} |
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if (UseCompressedOops) { |
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__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry), 2); |
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} else { |
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__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), 2); |
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} |
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__ pop(saved_regs, sp); |
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} |
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} |
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|
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void G1BarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators, |
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Register start, Register end, Register scratch, RegSet saved_regs) { |
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__ push(saved_regs, sp); |
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// must compute element count unless barrier set interface is changed (other platforms supply count) |
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assert_different_registers(start, end, scratch); |
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__ lea(scratch, Address(end, BytesPerHeapOop)); |
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__ sub(scratch, scratch, start); // subtract start to get #bytes |
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__ lsr(scratch, scratch, LogBytesPerHeapOop); // convert to element count |
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__ mov(c_rarg0, start); |
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__ mov(c_rarg1, scratch); |
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__ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), 2); |
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__ pop(saved_regs, sp); |
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} |
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void G1BarrierSetAssembler::g1_write_barrier_pre(MacroAssembler* masm, |
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Register obj, |
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Register pre_val, |
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Register thread, |
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Register tmp, |
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bool tosca_live, |
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bool expand_call) { |
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// If expand_call is true then we expand the call_VM_leaf macro |
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// directly to skip generating the check by |
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// InterpreterMacroAssembler::call_VM_leaf_base that checks _last_sp. |
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assert(thread == rthread, "must be"); |
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Label done; |
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Label runtime; |
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assert_different_registers(obj, pre_val, tmp, rscratch1); |
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assert(pre_val != noreg && tmp != noreg, "expecting a register"); |
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Address in_progress(thread, in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset())); |
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Address index(thread, in_bytes(G1ThreadLocalData::satb_mark_queue_index_offset())); |
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Address buffer(thread, in_bytes(G1ThreadLocalData::satb_mark_queue_buffer_offset())); |
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// Is marking active? |
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if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) { |
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__ ldrw(tmp, in_progress); |
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} else { |
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assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption"); |
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__ ldrb(tmp, in_progress); |
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} |
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__ cbzw(tmp, done); |
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// Do we need to load the previous value? |
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if (obj != noreg) { |
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__ load_heap_oop(pre_val, Address(obj, 0)); |
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} |
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// Is the previous value null? |
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__ cbz(pre_val, done); |
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// Can we store original value in the thread's buffer? |
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// Is index == 0? |
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// (The index field is typed as size_t.) |
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__ ldr(tmp, index); // tmp := *index_adr |
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__ cbz(tmp, runtime); // tmp == 0? |
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// If yes, goto runtime |
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126 |
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__ sub(tmp, tmp, wordSize); // tmp := tmp - wordSize |
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__ str(tmp, index); // *index_adr := tmp |
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__ ldr(rscratch1, buffer); |
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__ add(tmp, tmp, rscratch1); // tmp := tmp + *buffer_adr |
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// Record the previous value |
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__ str(pre_val, Address(tmp, 0)); |
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__ b(done); |
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136 |
__ bind(runtime); |
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// save the live input values |
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RegSet saved = RegSet::of(pre_val); |
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if (tosca_live) saved += RegSet::of(r0); |
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if (obj != noreg) saved += RegSet::of(obj); |
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__ push(saved, sp); |
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// Calling the runtime using the regular call_VM_leaf mechanism generates |
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// code (generated by InterpreterMacroAssember::call_VM_leaf_base) |
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// that checks that the *(rfp+frame::interpreter_frame_last_sp) == NULL. |
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// |
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// If we care generating the pre-barrier without a frame (e.g. in the |
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// intrinsified Reference.get() routine) then ebp might be pointing to |
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// the caller frame and so this check will most likely fail at runtime. |
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// |
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152 |
// Expanding the call directly bypasses the generation of the check. |
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// So when we do not have have a full interpreter frame on the stack |
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// expand_call should be passed true. |
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155 |
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if (expand_call) { |
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assert(pre_val != c_rarg1, "smashed arg"); |
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__ super_call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), pre_val, thread); |
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} else { |
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160 |
__ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), pre_val, thread); |
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161 |
} |
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162 |
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163 |
__ pop(saved, sp); |
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164 |
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165 |
__ bind(done); |
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166 |
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167 |
} |
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168 |
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169 |
void G1BarrierSetAssembler::g1_write_barrier_post(MacroAssembler* masm, |
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170 |
Register store_addr, |
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171 |
Register new_val, |
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172 |
Register thread, |
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Register tmp, |
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Register tmp2) { |
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assert(thread == rthread, "must be"); |
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assert_different_registers(store_addr, new_val, thread, tmp, tmp2, |
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177 |
rscratch1); |
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assert(store_addr != noreg && new_val != noreg && tmp != noreg |
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&& tmp2 != noreg, "expecting a register"); |
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Address queue_index(thread, in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset())); |
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Address buffer(thread, in_bytes(G1ThreadLocalData::dirty_card_queue_buffer_offset())); |
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49754 | 184 |
BarrierSet* bs = BarrierSet::barrier_set(); |
49748 | 185 |
CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs); |
186 |
CardTable* ct = ctbs->card_table(); |
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assert(sizeof(*ct->byte_map_base()) == sizeof(jbyte), "adjust this code"); |
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188 |
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189 |
Label done; |
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190 |
Label runtime; |
|
191 |
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192 |
// Does store cross heap regions? |
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193 |
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194 |
__ eor(tmp, store_addr, new_val); |
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__ lsr(tmp, tmp, HeapRegion::LogOfHRGrainBytes); |
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196 |
__ cbz(tmp, done); |
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197 |
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198 |
// crosses regions, storing NULL? |
|
199 |
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200 |
__ cbz(new_val, done); |
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201 |
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202 |
// storing region crossing non-NULL, is card already dirty? |
|
203 |
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204 |
ExternalAddress cardtable((address) ct->byte_map_base()); |
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assert(sizeof(*ct->byte_map_base()) == sizeof(jbyte), "adjust this code"); |
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206 |
const Register card_addr = tmp; |
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207 |
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208 |
__ lsr(card_addr, store_addr, CardTable::card_shift); |
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209 |
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210 |
// get the address of the card |
|
211 |
__ load_byte_map_base(tmp2); |
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212 |
__ add(card_addr, card_addr, tmp2); |
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213 |
__ ldrb(tmp2, Address(card_addr)); |
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214 |
__ cmpw(tmp2, (int)G1CardTable::g1_young_card_val()); |
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215 |
__ br(Assembler::EQ, done); |
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216 |
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217 |
assert((int)CardTable::dirty_card_val() == 0, "must be 0"); |
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218 |
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219 |
__ membar(Assembler::StoreLoad); |
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220 |
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221 |
__ ldrb(tmp2, Address(card_addr)); |
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222 |
__ cbzw(tmp2, done); |
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223 |
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224 |
// storing a region crossing, non-NULL oop, card is clean. |
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225 |
// dirty card and log. |
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226 |
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227 |
__ strb(zr, Address(card_addr)); |
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228 |
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229 |
__ ldr(rscratch1, queue_index); |
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230 |
__ cbz(rscratch1, runtime); |
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231 |
__ sub(rscratch1, rscratch1, wordSize); |
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232 |
__ str(rscratch1, queue_index); |
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233 |
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234 |
__ ldr(tmp2, buffer); |
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235 |
__ str(card_addr, Address(tmp2, rscratch1)); |
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236 |
__ b(done); |
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237 |
||
238 |
__ bind(runtime); |
|
239 |
// save the live input values |
|
240 |
RegSet saved = RegSet::of(store_addr, new_val); |
|
241 |
__ push(saved, sp); |
|
242 |
__ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, thread); |
|
243 |
__ pop(saved, sp); |
|
244 |
||
245 |
__ bind(done); |
|
246 |
} |
|
247 |
||
248 |
void G1BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, |
|
249 |
Register dst, Address src, Register tmp1, Register tmp_thread) { |
|
250 |
bool on_oop = type == T_OBJECT || type == T_ARRAY; |
|
251 |
bool on_weak = (decorators & ON_WEAK_OOP_REF) != 0; |
|
252 |
bool on_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0; |
|
253 |
bool on_reference = on_weak || on_phantom; |
|
254 |
ModRefBarrierSetAssembler::load_at(masm, decorators, type, dst, src, tmp1, tmp_thread); |
|
255 |
if (on_oop && on_reference) { |
|
256 |
// Generate the G1 pre-barrier code to log the value of |
|
257 |
// the referent field in an SATB buffer. |
|
258 |
g1_write_barrier_pre(masm /* masm */, |
|
259 |
noreg /* obj */, |
|
260 |
dst /* pre_val */, |
|
261 |
rthread /* thread */, |
|
262 |
tmp1 /* tmp */, |
|
263 |
true /* tosca_live */, |
|
264 |
true /* expand_call */); |
|
265 |
} |
|
266 |
} |
|
267 |
||
268 |
void G1BarrierSetAssembler::oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, |
|
269 |
Address dst, Register val, Register tmp1, Register tmp2) { |
|
270 |
// flatten object address if needed |
|
271 |
if (dst.index() == noreg && dst.offset() == 0) { |
|
272 |
if (dst.base() != r3) { |
|
273 |
__ mov(r3, dst.base()); |
|
274 |
} |
|
275 |
} else { |
|
276 |
__ lea(r3, dst); |
|
277 |
} |
|
278 |
||
279 |
g1_write_barrier_pre(masm, |
|
280 |
r3 /* obj */, |
|
281 |
tmp2 /* pre_val */, |
|
282 |
rthread /* thread */, |
|
283 |
tmp1 /* tmp */, |
|
284 |
val != noreg /* tosca_live */, |
|
285 |
false /* expand_call */); |
|
286 |
||
287 |
if (val == noreg) { |
|
288 |
__ store_heap_oop_null(Address(r3, 0)); |
|
289 |
} else { |
|
290 |
// G1 barrier needs uncompressed oop for region cross check. |
|
291 |
Register new_val = val; |
|
292 |
if (UseCompressedOops) { |
|
293 |
new_val = rscratch2; |
|
294 |
__ mov(new_val, val); |
|
295 |
} |
|
296 |
__ store_heap_oop(Address(r3, 0), val); |
|
297 |
g1_write_barrier_post(masm, |
|
298 |
r3 /* store_adr */, |
|
299 |
new_val /* new_val */, |
|
300 |
rthread /* thread */, |
|
301 |
tmp1 /* tmp */, |
|
302 |
tmp2 /* tmp2 */); |
|
303 |
} |
|
304 |
||
305 |
} |
|
306 |
||
307 |
#undef __ |