--- /dev/null 2018-11-30 10:10:44.238550338 +0100 +++ new/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp 2018-11-30 21:08:58.825908905 +0100 @@ -0,0 +1,4278 @@ +/* + * Copyright (c) 2015, 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/c2/shenandoahSupport.hpp" +#include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp" +#include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp" +#include "gc/shenandoah/shenandoahBrooksPointer.hpp" +#include "gc/shenandoah/shenandoahHeap.hpp" +#include "gc/shenandoah/shenandoahHeapRegion.hpp" +#include "gc/shenandoah/shenandoahRuntime.hpp" +#include "opto/arraycopynode.hpp" +#include "opto/block.hpp" +#include "opto/callnode.hpp" +#include "opto/castnode.hpp" +#include "opto/movenode.hpp" +#include "opto/phaseX.hpp" +#include "opto/rootnode.hpp" +#include "opto/runtime.hpp" +#include "opto/subnode.hpp" + +Node* ShenandoahBarrierNode::skip_through_barrier(Node* n) { + if (n == NULL) { + return NULL; + } + if (n->Opcode() == Op_ShenandoahEnqueueBarrier) { + n = n->in(1); + } + + if (n->is_ShenandoahBarrier()) { + return n->in(ValueIn); + } else if (n->is_Phi() && + n->req() == 3 && + n->in(1) != NULL && + n->in(1)->is_ShenandoahBarrier() && + n->in(2) != NULL && + n->in(2)->bottom_type() == TypePtr::NULL_PTR && + n->in(0) != NULL && + n->in(0)->in(1) != NULL && + n->in(0)->in(1)->is_IfProj() && + n->in(0)->in(2) != NULL && + n->in(0)->in(2)->is_IfProj() && + n->in(0)->in(1)->in(0) != NULL && + n->in(0)->in(1)->in(0) == n->in(0)->in(2)->in(0) && + n->in(1)->in(ValueIn)->Opcode() == Op_CastPP) { + Node* iff = n->in(0)->in(1)->in(0); + Node* res = n->in(1)->in(ValueIn)->in(1); + if (iff->is_If() && + iff->in(1) != NULL && + iff->in(1)->is_Bool() && + iff->in(1)->as_Bool()->_test._test == BoolTest::ne && + iff->in(1)->in(1) != NULL && + iff->in(1)->in(1)->Opcode() == Op_CmpP && + iff->in(1)->in(1)->in(1) != NULL && + iff->in(1)->in(1)->in(1) == res && + iff->in(1)->in(1)->in(2) != NULL && + iff->in(1)->in(1)->in(2)->bottom_type() == TypePtr::NULL_PTR) { + return res; + } + } + return n; +} + +bool ShenandoahBarrierNode::needs_barrier(PhaseGVN* phase, ShenandoahBarrierNode* orig, Node* n, Node* rb_mem, bool allow_fromspace) { + Unique_Node_List visited; + return needs_barrier_impl(phase, orig, n, rb_mem, allow_fromspace, visited); +} + +bool ShenandoahBarrierNode::needs_barrier_impl(PhaseGVN* phase, ShenandoahBarrierNode* orig, Node* n, Node* rb_mem, bool allow_fromspace, Unique_Node_List &visited) { + if (visited.member(n)) { + return false; // Been there. + } + visited.push(n); + + if (n->is_Allocate()) { + return false; + } + + if (n->is_CallJava() || n->Opcode() == Op_CallLeafNoFP) { + return true; + } + + const Type* type = phase->type(n); + if (type == Type::TOP) { + return false; + } + if (type->make_ptr()->higher_equal(TypePtr::NULL_PTR)) { + return false; + } + if (type->make_oopptr() && type->make_oopptr()->const_oop() != NULL) { + return false; + } + + if (ShenandoahOptimizeStableFinals) { + const TypeAryPtr* ary = type->isa_aryptr(); + if (ary && ary->is_stable() && allow_fromspace) { + return false; + } + } + + if (n->is_CheckCastPP() || n->is_ConstraintCast() || n->Opcode() == Op_ShenandoahEnqueueBarrier) { + return needs_barrier_impl(phase, orig, n->in(1), rb_mem, allow_fromspace, visited); + } + if (n->is_Parm()) { + return true; + } + if (n->is_Proj()) { + return needs_barrier_impl(phase, orig, n->in(0), rb_mem, allow_fromspace, visited); + } + + if (n->Opcode() == Op_ShenandoahWBMemProj) { + return needs_barrier_impl(phase, orig, n->in(ShenandoahWBMemProjNode::WriteBarrier), rb_mem, allow_fromspace, visited); + } + if (n->is_Phi()) { + bool need_barrier = false; + for (uint i = 1; i < n->req() && ! need_barrier; i++) { + Node* input = n->in(i); + if (input == NULL) { + need_barrier = true; // Phi not complete yet? + } else if (needs_barrier_impl(phase, orig, input, rb_mem, allow_fromspace, visited)) { + need_barrier = true; + } + } + return need_barrier; + } + if (n->is_CMove()) { + return needs_barrier_impl(phase, orig, n->in(CMoveNode::IfFalse), rb_mem, allow_fromspace, visited) || + needs_barrier_impl(phase, orig, n->in(CMoveNode::IfTrue ), rb_mem, allow_fromspace, visited); + } + if (n->Opcode() == Op_CreateEx) { + return true; + } + if (n->Opcode() == Op_ShenandoahWriteBarrier) { + return false; + } + if (n->Opcode() == Op_ShenandoahReadBarrier) { + if (rb_mem == n->in(Memory)) { + return false; + } else { + return true; + } + } + + if (n->Opcode() == Op_LoadP || + n->Opcode() == Op_LoadN || + n->Opcode() == Op_GetAndSetP || + n->Opcode() == Op_CompareAndExchangeP || + n->Opcode() == Op_ShenandoahCompareAndExchangeP || + n->Opcode() == Op_GetAndSetN || + n->Opcode() == Op_CompareAndExchangeN || + n->Opcode() == Op_ShenandoahCompareAndExchangeN) { + return true; + } + if (n->Opcode() == Op_DecodeN || + n->Opcode() == Op_EncodeP) { + return needs_barrier_impl(phase, orig, n->in(1), rb_mem, allow_fromspace, visited); + } + +#ifdef ASSERT + tty->print("need barrier on?: "); n->dump(); + ShouldNotReachHere(); +#endif + return true; +} + +bool ShenandoahReadBarrierNode::dominates_memory_rb_impl(PhaseGVN* phase, + Node* b1, + Node* b2, + Node* current, + bool linear) { + ResourceMark rm; + VectorSet visited(Thread::current()->resource_area()); + Node_Stack phis(0); + + for(int i = 0; i < 10; i++) { + if (current == NULL) { + return false; + } else if (visited.test_set(current->_idx) || current->is_top() || current == b1) { + current = NULL; + while (phis.is_nonempty() && current == NULL) { + uint idx = phis.index(); + Node* phi = phis.node(); + if (idx >= phi->req()) { + phis.pop(); + } else { + current = phi->in(idx); + phis.set_index(idx+1); + } + } + if (current == NULL) { + return true; + } + } else if (current == phase->C->immutable_memory()) { + return false; + } else if (current->isa_Phi()) { + if (!linear) { + return false; + } + phis.push(current, 2); + current = current->in(1); + } else if (current->Opcode() == Op_ShenandoahWriteBarrier) { + const Type* in_type = current->bottom_type(); + const Type* this_type = b2->bottom_type(); + if (is_independent(in_type, this_type)) { + current = current->in(Memory); + } else { + return false; + } + } else if (current->Opcode() == Op_ShenandoahWBMemProj) { + current = current->in(ShenandoahWBMemProjNode::WriteBarrier); + } else if (current->is_Proj()) { + current = current->in(0); + } else if (current->is_Call()) { + return false; // TODO: Maybe improve by looking at the call's memory effects? + } else if (current->is_MemBar()) { + return false; // TODO: Do we need to stop at *any* membar? + } else if (current->is_MergeMem()) { + const TypePtr* adr_type = brooks_pointer_type(phase->type(b2)); + uint alias_idx = phase->C->get_alias_index(adr_type); + current = current->as_MergeMem()->memory_at(alias_idx); + } else { +#ifdef ASSERT + current->dump(); +#endif + ShouldNotReachHere(); + return false; + } + } + return false; +} + +bool ShenandoahReadBarrierNode::is_independent(Node* mem) { + if (mem->is_Phi() || mem->is_Proj() || mem->is_MergeMem()) { + return true; + } else if (mem->Opcode() == Op_ShenandoahWBMemProj) { + return true; + } else if (mem->Opcode() == Op_ShenandoahWriteBarrier) { + const Type* mem_type = mem->bottom_type(); + const Type* this_type = bottom_type(); + if (is_independent(mem_type, this_type)) { + return true; + } else { + return false; + } + } else if (mem->is_Call() || mem->is_MemBar()) { + return false; + } +#ifdef ASSERT + mem->dump(); +#endif + ShouldNotReachHere(); + return true; +} + +bool ShenandoahReadBarrierNode::dominates_memory_rb(PhaseGVN* phase, Node* b1, Node* b2, bool linear) { + return dominates_memory_rb_impl(phase, b1->in(Memory), b2, b2->in(Memory), linear); +} + +bool ShenandoahReadBarrierNode::is_independent(const Type* in_type, const Type* this_type) { + assert(in_type->isa_oopptr(), "expect oop ptr"); + assert(this_type->isa_oopptr(), "expect oop ptr"); + + ciKlass* in_kls = in_type->is_oopptr()->klass(); + ciKlass* this_kls = this_type->is_oopptr()->klass(); + if (in_kls != NULL && this_kls != NULL && + in_kls->is_loaded() && this_kls->is_loaded() && + (!in_kls->is_subclass_of(this_kls)) && + (!this_kls->is_subclass_of(in_kls))) { + return true; + } + return false; +} + +Node* ShenandoahReadBarrierNode::Ideal(PhaseGVN *phase, bool can_reshape) { + if (! can_reshape) { + return NULL; + } + + if (in(Memory) == phase->C->immutable_memory()) return NULL; + + // If memory input is a MergeMem, take the appropriate slice out of it. + Node* mem_in = in(Memory); + if (mem_in->isa_MergeMem()) { + const TypePtr* adr_type = brooks_pointer_type(bottom_type()); + uint alias_idx = phase->C->get_alias_index(adr_type); + mem_in = mem_in->as_MergeMem()->memory_at(alias_idx); + set_req(Memory, mem_in); + return this; + } + + Node* input = in(Memory); + if (input->Opcode() == Op_ShenandoahWBMemProj) { + ResourceMark rm; + VectorSet seen(Thread::current()->resource_area()); + Node* n = in(Memory); + while (n->Opcode() == Op_ShenandoahWBMemProj && + n->in(ShenandoahWBMemProjNode::WriteBarrier) != NULL && + n->in(ShenandoahWBMemProjNode::WriteBarrier)->Opcode() == Op_ShenandoahWriteBarrier && + n->in(ShenandoahWBMemProjNode::WriteBarrier)->in(Memory) != NULL) { + if (seen.test_set(n->_idx)) { + return NULL; // loop + } + n = n->in(ShenandoahWBMemProjNode::WriteBarrier)->in(Memory); + } + + Node* wb = input->in(ShenandoahWBMemProjNode::WriteBarrier); + const Type* in_type = phase->type(wb); + // is_top() test not sufficient here: we can come here after CCP + // in a dead branch of the graph that has not yet been removed. + if (in_type == Type::TOP) return NULL; // Dead path. + assert(wb->Opcode() == Op_ShenandoahWriteBarrier, "expect write barrier"); + if (is_independent(in_type, _type)) { + phase->igvn_rehash_node_delayed(wb); + set_req(Memory, wb->in(Memory)); + if (can_reshape && input->outcnt() == 0) { + phase->is_IterGVN()->_worklist.push(input); + } + return this; + } + } + return NULL; +} + +ShenandoahWriteBarrierNode::ShenandoahWriteBarrierNode(Compile* C, Node* ctrl, Node* mem, Node* obj) + : ShenandoahBarrierNode(ctrl, mem, obj, false) { + assert(UseShenandoahGC && ShenandoahWriteBarrier, "should be enabled"); + ShenandoahBarrierSetC2::bsc2()->state()->add_shenandoah_barrier(this); +} + +Node* ShenandoahWriteBarrierNode::Identity(PhaseGVN* phase) { + assert(in(0) != NULL, "should have control"); + PhaseIterGVN* igvn = phase->is_IterGVN(); + Node* mem_in = in(Memory); + Node* mem_proj = NULL; + + if (igvn != NULL) { + mem_proj = find_out_with(Op_ShenandoahWBMemProj); + if (mem_in == mem_proj) { + return this; + } + } + + Node* replacement = Identity_impl(phase); + if (igvn != NULL) { + if (replacement != NULL && replacement != this && mem_proj != NULL) { + igvn->replace_node(mem_proj, mem_in); + } + } + return replacement; +} + +Node* ShenandoahWriteBarrierNode::Ideal(PhaseGVN *phase, bool can_reshape) { + assert(in(0) != NULL, "should have control"); + if (!can_reshape) { + return NULL; + } + + Node* mem_in = in(Memory); + + if (mem_in->isa_MergeMem()) { + const TypePtr* adr_type = brooks_pointer_type(bottom_type()); + uint alias_idx = phase->C->get_alias_index(adr_type); + mem_in = mem_in->as_MergeMem()->memory_at(alias_idx); + set_req(Memory, mem_in); + return this; + } + + Node* val = in(ValueIn); + if (val->is_ShenandoahBarrier()) { + set_req(ValueIn, val->in(ValueIn)); + return this; + } + + return NULL; +} + +bool ShenandoahWriteBarrierNode::expand(Compile* C, PhaseIterGVN& igvn) { + if (UseShenandoahGC) { + if (ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count() > 0 || (!ShenandoahWriteBarrier && ShenandoahStoreValEnqueueBarrier)) { + bool attempt_more_loopopts = ShenandoahLoopOptsAfterExpansion; + C->clear_major_progress(); + PhaseIdealLoop ideal_loop(igvn, LoopOptsShenandoahExpand); + if (C->failing()) return false; + PhaseIdealLoop::verify(igvn); + DEBUG_ONLY(ShenandoahBarrierNode::verify_raw_mem(C->root());) + if (attempt_more_loopopts) { + C->set_major_progress(); + if (!C->optimize_loops(igvn, LoopOptsShenandoahPostExpand)) { + return false; + } + C->clear_major_progress(); + } + } + } + return true; +} + +bool ShenandoahWriteBarrierNode::is_heap_state_test(Node* iff, int mask) { + if (!UseShenandoahGC) { + return false; + } + assert(iff->is_If(), "bad input"); + if (iff->Opcode() != Op_If) { + return false; + } + Node* bol = iff->in(1); + if (!bol->is_Bool() || bol->as_Bool()->_test._test != BoolTest::ne) { + return false; + } + Node* cmp = bol->in(1); + if (cmp->Opcode() != Op_CmpI) { + return false; + } + Node* in1 = cmp->in(1); + Node* in2 = cmp->in(2); + if (in2->find_int_con(-1) != 0) { + return false; + } + if (in1->Opcode() != Op_AndI) { + return false; + } + in2 = in1->in(2); + if (in2->find_int_con(-1) != mask) { + return false; + } + in1 = in1->in(1); + + return is_gc_state_load(in1); +} + +bool ShenandoahWriteBarrierNode::is_heap_stable_test(Node* iff) { + return is_heap_state_test(iff, ShenandoahHeap::HAS_FORWARDED); +} + +bool ShenandoahWriteBarrierNode::is_gc_state_load(Node *n) { + if (!UseShenandoahGC) { + return false; + } + if (n->Opcode() != Op_LoadB && n->Opcode() != Op_LoadUB) { + return false; + } + Node* addp = n->in(MemNode::Address); + if (!addp->is_AddP()) { + return false; + } + Node* base = addp->in(AddPNode::Address); + Node* off = addp->in(AddPNode::Offset); + if (base->Opcode() != Op_ThreadLocal) { + return false; + } + if (off->find_intptr_t_con(-1) != in_bytes(ShenandoahThreadLocalData::gc_state_offset())) { + return false; + } + return true; +} + +bool ShenandoahWriteBarrierNode::has_safepoint_between(Node* start, Node* stop, PhaseIdealLoop *phase) { + assert(phase->is_dominator(stop, start), "bad inputs"); + ResourceMark rm; + Unique_Node_List wq; + wq.push(start); + for (uint next = 0; next < wq.size(); next++) { + Node *m = wq.at(next); + if (m == stop) { + continue; + } + if (m->is_SafePoint() && !m->is_CallLeaf()) { + return true; + } + if (m->is_Region()) { + for (uint i = 1; i < m->req(); i++) { + wq.push(m->in(i)); + } + } else { + wq.push(m->in(0)); + } + } + return false; +} + +bool ShenandoahWriteBarrierNode::try_common_gc_state_load(Node *n, PhaseIdealLoop *phase) { + assert(is_gc_state_load(n), "inconsistent"); + Node* addp = n->in(MemNode::Address); + Node* dominator = NULL; + for (DUIterator_Fast imax, i = addp->fast_outs(imax); i < imax; i++) { + Node* u = addp->fast_out(i); + assert(is_gc_state_load(u), "inconsistent"); + if (u != n && phase->is_dominator(u->in(0), n->in(0))) { + if (dominator == NULL) { + dominator = u; + } else { + if (phase->dom_depth(u->in(0)) < phase->dom_depth(dominator->in(0))) { + dominator = u; + } + } + } + } + if (dominator == NULL || has_safepoint_between(n->in(0), dominator->in(0), phase)) { + return false; + } + phase->igvn().replace_node(n, dominator); + + return true; +} + +bool ShenandoahBarrierNode::dominates_memory_impl(PhaseGVN* phase, + Node* b1, + Node* b2, + Node* current, + bool linear) { + ResourceMark rm; + VectorSet visited(Thread::current()->resource_area()); + Node_Stack phis(0); + + for(int i = 0; i < 10; i++) { + if (current == NULL) { + return false; + } else if (visited.test_set(current->_idx) || current->is_top() || current == b1) { + current = NULL; + while (phis.is_nonempty() && current == NULL) { + uint idx = phis.index(); + Node* phi = phis.node(); + if (idx >= phi->req()) { + phis.pop(); + } else { + current = phi->in(idx); + phis.set_index(idx+1); + } + } + if (current == NULL) { + return true; + } + } else if (current == b2) { + return false; + } else if (current == phase->C->immutable_memory()) { + return false; + } else if (current->isa_Phi()) { + if (!linear) { + return false; + } + phis.push(current, 2); + current = current->in(1); + } else if (current->Opcode() == Op_ShenandoahWriteBarrier) { + current = current->in(Memory); + } else if (current->Opcode() == Op_ShenandoahWBMemProj) { + current = current->in(ShenandoahWBMemProjNode::WriteBarrier); + } else if (current->is_Proj()) { + current = current->in(0); + } else if (current->is_Call()) { + current = current->in(TypeFunc::Memory); + } else if (current->is_MemBar()) { + current = current->in(TypeFunc::Memory); + } else if (current->is_MergeMem()) { + const TypePtr* adr_type = brooks_pointer_type(phase->type(b2)); + uint alias_idx = phase->C->get_alias_index(adr_type); + current = current->as_MergeMem()->memory_at(alias_idx); + } else { +#ifdef ASSERT + current->dump(); +#endif + ShouldNotReachHere(); + return false; + } + } + return false; +} + +/** + * Determines if b1 dominates b2 through memory inputs. It returns true if: + * - b1 can be reached by following each branch in b2's memory input (through phis, etc) + * - or we get back to b2 (i.e. through a loop) without seeing b1 + * In all other cases, (in particular, if we reach immutable_memory without having seen b1) + * we return false. + */ +bool ShenandoahBarrierNode::dominates_memory(PhaseGVN* phase, Node* b1, Node* b2, bool linear) { + return dominates_memory_impl(phase, b1, b2, b2->in(Memory), linear); +} + +Node* ShenandoahBarrierNode::Identity_impl(PhaseGVN* phase) { + Node* n = in(ValueIn); + + Node* rb_mem = Opcode() == Op_ShenandoahReadBarrier ? in(Memory) : NULL; + if (! needs_barrier(phase, this, n, rb_mem, _allow_fromspace)) { + return n; + } + + // Try to find a write barrier sibling with identical inputs that we can fold into. + for (DUIterator i = n->outs(); n->has_out(i); i++) { + Node* sibling = n->out(i); + if (sibling == this) { + continue; + } + if (sibling->Opcode() != Op_ShenandoahWriteBarrier) { + continue; + } + + assert(sibling->in(ValueIn) == in(ValueIn), "sanity"); + assert(sibling->Opcode() == Op_ShenandoahWriteBarrier, "sanity"); + + if (dominates_memory(phase, sibling, this, phase->is_IterGVN() == NULL)) { + return sibling; + } + } + return this; +} + +#ifndef PRODUCT +void ShenandoahBarrierNode::dump_spec(outputStream *st) const { + const TypePtr* adr = adr_type(); + if (adr == NULL) { + return; + } + st->print(" @"); + adr->dump_on(st); + st->print(" ("); + Compile::current()->alias_type(adr)->adr_type()->dump_on(st); + st->print(") "); +} +#endif + +Node* ShenandoahReadBarrierNode::Identity(PhaseGVN* phase) { + Node* id = Identity_impl(phase); + + if (id == this && phase->is_IterGVN()) { + Node* n = in(ValueIn); + // No success in super call. Try to combine identical read barriers. + for (DUIterator i = n->outs(); n->has_out(i); i++) { + Node* sibling = n->out(i); + if (sibling == this || sibling->Opcode() != Op_ShenandoahReadBarrier) { + continue; + } + assert(sibling->in(ValueIn) == in(ValueIn), "sanity"); + if (phase->is_IterGVN()->hash_find(sibling) && + sibling->bottom_type() == bottom_type() && + sibling->in(Control) == in(Control) && + dominates_memory_rb(phase, sibling, this, phase->is_IterGVN() == NULL)) { + return sibling; + } + } + } + return id; +} + +const Type* ShenandoahBarrierNode::Value(PhaseGVN* phase) const { + // Either input is TOP ==> the result is TOP + const Type *t1 = phase->type(in(Memory)); + if (t1 == Type::TOP) return Type::TOP; + const Type *t2 = phase->type(in(ValueIn)); + if( t2 == Type::TOP ) return Type::TOP; + + if (t2 == TypePtr::NULL_PTR) { + return _type; + } + + const Type* type = t2->is_oopptr()->cast_to_nonconst(); + return type; +} + +uint ShenandoahBarrierNode::hash() const { + return TypeNode::hash() + _allow_fromspace; +} + +uint ShenandoahBarrierNode::cmp(const Node& n) const { + return _allow_fromspace == ((ShenandoahBarrierNode&) n)._allow_fromspace + && TypeNode::cmp(n); +} + +uint ShenandoahBarrierNode::size_of() const { + return sizeof(*this); +} + +Node* ShenandoahWBMemProjNode::Identity(PhaseGVN* phase) { + Node* wb = in(WriteBarrier); + if (wb->is_top()) return phase->C->top(); // Dead path. + + assert(wb->Opcode() == Op_ShenandoahWriteBarrier, "expect write barrier"); + PhaseIterGVN* igvn = phase->is_IterGVN(); + // We can't do the below unless the graph is fully constructed. + if (igvn == NULL) { + return this; + } + + // If the mem projection has no barrier users, it's not needed anymore. + if (wb->outcnt() == 1) { + return wb->in(ShenandoahBarrierNode::Memory); + } + + return this; +} + +#ifdef ASSERT +bool ShenandoahBarrierNode::verify_helper(Node* in, Node_Stack& phis, VectorSet& visited, verify_type t, bool trace, Unique_Node_List& barriers_used) { + assert(phis.size() == 0, ""); + + while (true) { + if (in->bottom_type() == TypePtr::NULL_PTR) { + if (trace) {tty->print_cr("NULL");} + } else if (!in->bottom_type()->make_ptr()->make_oopptr()) { + if (trace) {tty->print_cr("Non oop");} + } else if (t == ShenandoahLoad && ShenandoahOptimizeStableFinals && + in->bottom_type()->make_ptr()->isa_aryptr() && + in->bottom_type()->make_ptr()->is_aryptr()->is_stable()) { + if (trace) {tty->print_cr("Stable array load");} + } else { + if (in->is_ConstraintCast()) { + in = in->in(1); + continue; + } else if (in->is_AddP()) { + assert(!in->in(AddPNode::Address)->is_top(), "no raw memory access"); + in = in->in(AddPNode::Address); + continue; + } else if (in->is_Con()) { + if (trace) {tty->print("Found constant"); in->dump();} + } else if (in->is_ShenandoahBarrier()) { + if (t == ShenandoahOopStore) { + if (in->Opcode() != Op_ShenandoahWriteBarrier) { + return false; + } + uint i = 0; + for (; i < phis.size(); i++) { + Node* n = phis.node_at(i); + if (n->Opcode() == Op_ShenandoahEnqueueBarrier) { + break; + } + } + if (i == phis.size()) { + return false; + } + } else if (t == ShenandoahStore && in->Opcode() != Op_ShenandoahWriteBarrier) { + return false; + } + barriers_used.push(in); + if (trace) {tty->print("Found barrier"); in->dump();} + } else if (in->Opcode() == Op_ShenandoahEnqueueBarrier) { + if (t != ShenandoahOopStore) { + in = in->in(1); + continue; + } + if (trace) {tty->print("Found enqueue barrier"); in->dump();} + phis.push(in, in->req()); + in = in->in(1); + continue; + } else if (in->is_Proj() && in->in(0)->is_Allocate()) { + if (trace) {tty->print("Found alloc"); in->in(0)->dump();} + } else if (in->is_Phi()) { + if (!visited.test_set(in->_idx)) { + if (trace) {tty->print("Pushed phi:"); in->dump();} + phis.push(in, 2); + in = in->in(1); + continue; + } + if (trace) {tty->print("Already seen phi:"); in->dump();} + } else if (in->Opcode() == Op_CMoveP || in->Opcode() == Op_CMoveN) { + if (!visited.test_set(in->_idx)) { + if (trace) {tty->print("Pushed cmovep:"); in->dump();} + phis.push(in, CMoveNode::IfTrue); + in = in->in(CMoveNode::IfFalse); + continue; + } + if (trace) {tty->print("Already seen cmovep:"); in->dump();} + } else if (in->Opcode() == Op_EncodeP || in->Opcode() == Op_DecodeN) { + in = in->in(1); + continue; + } else { + return false; + } + } + bool cont = false; + while (phis.is_nonempty()) { + uint idx = phis.index(); + Node* phi = phis.node(); + if (idx >= phi->req()) { + if (trace) {tty->print("Popped phi:"); phi->dump();} + phis.pop(); + continue; + } + if (trace) {tty->print("Next entry(%d) for phi:", idx); phi->dump();} + in = phi->in(idx); + phis.set_index(idx+1); + cont = true; + break; + } + if (!cont) { + break; + } + } + return true; +} + +void ShenandoahBarrierNode::report_verify_failure(const char *msg, Node *n1, Node *n2) { + if (n1 != NULL) { + n1->dump(+10); + } + if (n2 != NULL) { + n2->dump(+10); + } + fatal("%s", msg); +} + +void ShenandoahBarrierNode::verify(RootNode* root) { + ResourceMark rm; + Unique_Node_List wq; + GrowableArray barriers; + Unique_Node_List barriers_used; + Node_Stack phis(0); + VectorSet visited(Thread::current()->resource_area()); + const bool trace = false; + const bool verify_no_useless_barrier = false; + + wq.push(root); + for (uint next = 0; next < wq.size(); next++) { + Node *n = wq.at(next); + if (n->is_Load()) { + const bool trace = false; + if (trace) {tty->print("Verifying"); n->dump();} + if (n->Opcode() == Op_LoadRange || n->Opcode() == Op_LoadKlass || n->Opcode() == Op_LoadNKlass) { + if (trace) {tty->print_cr("Load range/klass");} + } else { + const TypePtr* adr_type = n->as_Load()->adr_type(); + + if (adr_type->isa_oopptr() && adr_type->is_oopptr()->offset() == oopDesc::mark_offset_in_bytes()) { + if (trace) {tty->print_cr("Mark load");} + } else if (adr_type->isa_instptr() && + adr_type->is_instptr()->klass()->is_subtype_of(Compile::current()->env()->Reference_klass()) && + adr_type->is_instptr()->offset() == java_lang_ref_Reference::referent_offset) { + if (trace) {tty->print_cr("Reference.get()");} + } else { + bool verify = true; + if (adr_type->isa_instptr()) { + const TypeInstPtr* tinst = adr_type->is_instptr(); + ciKlass* k = tinst->klass(); + assert(k->is_instance_klass(), ""); + ciInstanceKlass* ik = (ciInstanceKlass*)k; + int offset = adr_type->offset(); + + if ((ik->debug_final_field_at(offset) && ShenandoahOptimizeInstanceFinals) || + (ik->debug_stable_field_at(offset) && ShenandoahOptimizeStableFinals)) { + if (trace) {tty->print_cr("Final/stable");} + verify = false; + } else if (k == ciEnv::current()->Class_klass() && + tinst->const_oop() != NULL && + tinst->offset() >= (ik->size_helper() * wordSize)) { + ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass(); + ciField* field = k->get_field_by_offset(tinst->offset(), true); + if ((ShenandoahOptimizeStaticFinals && field->is_final()) || + (ShenandoahOptimizeStableFinals && field->is_stable())) { + verify = false; + } + } + } + + if (verify && !ShenandoahBarrierNode::verify_helper(n->in(MemNode::Address), phis, visited, ShenandoahLoad, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: Load should have barriers", n); + } + } + } + } else if (n->is_Store()) { + const bool trace = false; + + if (trace) {tty->print("Verifying"); n->dump();} + if (n->in(MemNode::ValueIn)->bottom_type()->make_oopptr()) { + Node* adr = n->in(MemNode::Address); + bool verify = true; + + if (adr->is_AddP() && adr->in(AddPNode::Base)->is_top()) { + adr = adr->in(AddPNode::Address); + if (adr->is_AddP()) { + assert(adr->in(AddPNode::Base)->is_top(), ""); + adr = adr->in(AddPNode::Address); + if (adr->Opcode() == Op_LoadP && + adr->in(MemNode::Address)->in(AddPNode::Base)->is_top() && + adr->in(MemNode::Address)->in(AddPNode::Address)->Opcode() == Op_ThreadLocal && + adr->in(MemNode::Address)->in(AddPNode::Offset)->find_intptr_t_con(-1) == in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset())) { + if (trace) {tty->print_cr("SATB prebarrier");} + verify = false; + } + } + } + + if (verify && !ShenandoahBarrierNode::verify_helper(n->in(MemNode::ValueIn), phis, visited, ShenandoahStoreValEnqueueBarrier ? ShenandoahOopStore : ShenandoahValue, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: Store should have barriers", n); + } + } + if (!ShenandoahBarrierNode::verify_helper(n->in(MemNode::Address), phis, visited, ShenandoahStore, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: Store (address) should have barriers", n); + } + } else if (n->Opcode() == Op_CmpP) { + const bool trace = false; + + Node* in1 = n->in(1); + Node* in2 = n->in(2); + if (in1->bottom_type()->isa_oopptr()) { + if (trace) {tty->print("Verifying"); n->dump();} + + bool mark_inputs = false; + if (in1->bottom_type() == TypePtr::NULL_PTR || in2->bottom_type() == TypePtr::NULL_PTR || + (in1->is_Con() || in2->is_Con())) { + if (trace) {tty->print_cr("Comparison against a constant");} + mark_inputs = true; + } else if ((in1->is_CheckCastPP() && in1->in(1)->is_Proj() && in1->in(1)->in(0)->is_Allocate()) || + (in2->is_CheckCastPP() && in2->in(1)->is_Proj() && in2->in(1)->in(0)->is_Allocate())) { + if (trace) {tty->print_cr("Comparison with newly alloc'ed object");} + mark_inputs = true; + } else { + assert(in2->bottom_type()->isa_oopptr(), ""); + + if (!ShenandoahBarrierNode::verify_helper(in1, phis, visited, ShenandoahStore, trace, barriers_used) || + !ShenandoahBarrierNode::verify_helper(in2, phis, visited, ShenandoahStore, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: Cmp should have barriers", n); + } + } + if (verify_no_useless_barrier && + mark_inputs && + (!ShenandoahBarrierNode::verify_helper(in1, phis, visited, ShenandoahValue, trace, barriers_used) || + !ShenandoahBarrierNode::verify_helper(in2, phis, visited, ShenandoahValue, trace, barriers_used))) { + phis.clear(); + visited.Reset(); + } + } + } else if (n->is_LoadStore()) { + if (n->in(MemNode::ValueIn)->bottom_type()->make_ptr() && + !ShenandoahBarrierNode::verify_helper(n->in(MemNode::ValueIn), phis, visited, ShenandoahStoreValEnqueueBarrier ? ShenandoahOopStore : ShenandoahValue, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: LoadStore (value) should have barriers", n); + } + + if (n->in(MemNode::Address)->bottom_type()->make_oopptr() && !ShenandoahBarrierNode::verify_helper(n->in(MemNode::Address), phis, visited, ShenandoahStore, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: LoadStore (address) should have barriers", n); + } + } else if (n->Opcode() == Op_CallLeafNoFP || n->Opcode() == Op_CallLeaf) { + CallNode* call = n->as_Call(); + + static struct { + const char* name; + struct { + int pos; + verify_type t; + } args[6]; + } calls[] = { + "aescrypt_encryptBlock", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "aescrypt_decryptBlock", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "multiplyToLen", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad }, { TypeFunc::Parms+4, ShenandoahStore }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "squareToLen", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad }, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "montgomery_multiply", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad }, + { TypeFunc::Parms+6, ShenandoahStore }, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "montgomery_square", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+5, ShenandoahStore }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "mulAdd", + { { TypeFunc::Parms, ShenandoahStore }, { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "vectorizedMismatch", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "updateBytesCRC32", + { { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "updateBytesAdler32", + { { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "updateBytesCRC32C", + { { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+3, ShenandoahLoad}, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "counterMode_AESCrypt", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad }, + { TypeFunc::Parms+3, ShenandoahStore }, { TypeFunc::Parms+5, ShenandoahStore }, { TypeFunc::Parms+6, ShenandoahStore } }, + "cipherBlockChaining_encryptAESCrypt", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad }, + { TypeFunc::Parms+3, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "cipherBlockChaining_decryptAESCrypt", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad }, + { TypeFunc::Parms+3, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "shenandoah_clone_barrier", + { { TypeFunc::Parms, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone}, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "ghash_processBlocks", + { { TypeFunc::Parms, ShenandoahStore }, { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "sha1_implCompress", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "sha256_implCompress", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "sha512_implCompress", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "sha1_implCompressMB", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "sha256_implCompressMB", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + "sha512_implCompressMB", + { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone }, + { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} }, + }; + + if (call->is_call_to_arraycopystub()) { + Node* dest = NULL; + const TypeTuple* args = n->as_Call()->_tf->domain(); + for (uint i = TypeFunc::Parms, j = 0; i < args->cnt(); i++) { + if (args->field_at(i)->isa_ptr()) { + j++; + if (j == 2) { + dest = n->in(i); + break; + } + } + } + if (!ShenandoahBarrierNode::verify_helper(n->in(TypeFunc::Parms), phis, visited, ShenandoahLoad, trace, barriers_used) || + !ShenandoahBarrierNode::verify_helper(dest, phis, visited, ShenandoahStore, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: ArrayCopy should have barriers", n); + } + } else if (strlen(call->_name) > 5 && + !strcmp(call->_name + strlen(call->_name) - 5, "_fill")) { + if (!ShenandoahBarrierNode::verify_helper(n->in(TypeFunc::Parms), phis, visited, ShenandoahStore, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: _fill should have barriers", n); + } + } else if (!strcmp(call->_name, "shenandoah_wb_pre")) { + // skip + } else { + const int calls_len = sizeof(calls) / sizeof(calls[0]); + int i = 0; + for (; i < calls_len; i++) { + if (!strcmp(calls[i].name, call->_name)) { + break; + } + } + if (i != calls_len) { + const uint args_len = sizeof(calls[0].args) / sizeof(calls[0].args[0]); + for (uint j = 0; j < args_len; j++) { + int pos = calls[i].args[j].pos; + if (pos == -1) { + break; + } + if (!ShenandoahBarrierNode::verify_helper(call->in(pos), phis, visited, calls[i].args[j].t, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: intrinsic calls should have barriers", n); + } + } + for (uint j = TypeFunc::Parms; j < call->req(); j++) { + if (call->in(j)->bottom_type()->make_ptr() && + call->in(j)->bottom_type()->make_ptr()->isa_oopptr()) { + uint k = 0; + for (; k < args_len && calls[i].args[k].pos != (int)j; k++); + if (k == args_len) { + fatal("arg %d for call %s not covered", j, call->_name); + } + } + } + } else { + for (uint j = TypeFunc::Parms; j < call->req(); j++) { + if (call->in(j)->bottom_type()->make_ptr() && + call->in(j)->bottom_type()->make_ptr()->isa_oopptr()) { + fatal("%s not covered", call->_name); + } + } + } + } + } else if (n->is_ShenandoahBarrier()) { + assert(!barriers.contains(n), ""); + assert(n->Opcode() != Op_ShenandoahWriteBarrier || n->find_out_with(Op_ShenandoahWBMemProj) != NULL, "bad shenandoah write barrier"); + assert(n->Opcode() != Op_ShenandoahWriteBarrier || n->outcnt() > 1, "bad shenandoah write barrier"); + barriers.push(n); + } else if (n->Opcode() == Op_ShenandoahEnqueueBarrier) { + // skip + } else if (n->Opcode() == Op_ShenandoahWBMemProj) { + assert(n->in(0) == NULL && n->in(ShenandoahWBMemProjNode::WriteBarrier)->Opcode() == Op_ShenandoahWriteBarrier, "strange ShenandoahWBMemProj"); + } else if (n->is_AddP() + || n->is_Phi() + || n->is_ConstraintCast() + || n->Opcode() == Op_Return + || n->Opcode() == Op_CMoveP + || n->Opcode() == Op_CMoveN + || n->Opcode() == Op_Rethrow + || n->is_MemBar() + || n->Opcode() == Op_Conv2B + || n->Opcode() == Op_SafePoint + || n->is_CallJava() + || n->Opcode() == Op_Unlock + || n->Opcode() == Op_EncodeP + || n->Opcode() == Op_DecodeN) { + // nothing to do + } else { + static struct { + int opcode; + struct { + int pos; + verify_type t; + } inputs[2]; + } others[] = { + Op_FastLock, + { { 1, ShenandoahLoad }, { -1, ShenandoahNone} }, + Op_Lock, + { { TypeFunc::Parms, ShenandoahLoad }, { -1, ShenandoahNone} }, + Op_ArrayCopy, + { { ArrayCopyNode::Src, ShenandoahLoad }, { ArrayCopyNode::Dest, ShenandoahStore } }, + Op_StrCompressedCopy, + { { 2, ShenandoahLoad }, { 3, ShenandoahStore } }, + Op_StrInflatedCopy, + { { 2, ShenandoahLoad }, { 3, ShenandoahStore } }, + Op_AryEq, + { { 2, ShenandoahLoad }, { 3, ShenandoahLoad } }, + Op_StrIndexOf, + { { 2, ShenandoahLoad }, { 4, ShenandoahLoad } }, + Op_StrComp, + { { 2, ShenandoahLoad }, { 4, ShenandoahLoad } }, + Op_StrEquals, + { { 2, ShenandoahLoad }, { 3, ShenandoahLoad } }, + Op_EncodeISOArray, + { { 2, ShenandoahLoad }, { 3, ShenandoahStore } }, + Op_HasNegatives, + { { 2, ShenandoahLoad }, { -1, ShenandoahNone} }, + Op_CastP2X, + { { 1, ShenandoahLoad }, { -1, ShenandoahNone} }, + Op_StrIndexOfChar, + { { 2, ShenandoahLoad }, { -1, ShenandoahNone } }, + }; + + const int others_len = sizeof(others) / sizeof(others[0]); + int i = 0; + for (; i < others_len; i++) { + if (others[i].opcode == n->Opcode()) { + break; + } + } + uint stop = n->is_Call() ? n->as_Call()->tf()->domain()->cnt() : n->req(); + if (i != others_len) { + const uint inputs_len = sizeof(others[0].inputs) / sizeof(others[0].inputs[0]); + for (uint j = 0; j < inputs_len; j++) { + int pos = others[i].inputs[j].pos; + if (pos == -1) { + break; + } + if (!ShenandoahBarrierNode::verify_helper(n->in(pos), phis, visited, others[i].inputs[j].t, trace, barriers_used)) { + report_verify_failure("Shenandoah verification: intrinsic calls should have barriers", n); + } + } + for (uint j = 1; j < stop; j++) { + if (n->in(j) != NULL && n->in(j)->bottom_type()->make_ptr() && + n->in(j)->bottom_type()->make_ptr()->make_oopptr()) { + uint k = 0; + for (; k < inputs_len && others[i].inputs[k].pos != (int)j; k++); + if (k == inputs_len) { + fatal("arg %d for node %s not covered", j, n->Name()); + } + } + } + } else { + for (uint j = 1; j < stop; j++) { + if (n->in(j) != NULL && n->in(j)->bottom_type()->make_ptr() && + n->in(j)->bottom_type()->make_ptr()->make_oopptr()) { + fatal("%s not covered", n->Name()); + } + } + } + } + + if (n->is_SafePoint()) { + SafePointNode* sfpt = n->as_SafePoint(); + if (verify_no_useless_barrier && sfpt->jvms() != NULL) { + for (uint i = sfpt->jvms()->scloff(); i < sfpt->jvms()->endoff(); i++) { + if (!ShenandoahBarrierNode::verify_helper(sfpt->in(i), phis, visited, ShenandoahLoad, trace, barriers_used)) { + phis.clear(); + visited.Reset(); + } + } + } + } + for( uint i = 0; i < n->len(); ++i ) { + Node *m = n->in(i); + if (m == NULL) continue; + + // In most cases, inputs should be known to be non null. If it's + // not the case, it could be a missing cast_not_null() in an + // intrinsic or support might be needed in AddPNode::Ideal() to + // avoid a NULL+offset input. + if (!(n->is_Phi() || + (n->is_SafePoint() && (!n->is_CallRuntime() || !strcmp(n->as_Call()->_name, "shenandoah_wb_pre") || !strcmp(n->as_Call()->_name, "unsafe_arraycopy"))) || + n->Opcode() == Op_CmpP || + n->Opcode() == Op_CmpN || + (n->Opcode() == Op_StoreP && i == StoreNode::ValueIn) || + (n->Opcode() == Op_StoreN && i == StoreNode::ValueIn) || + n->is_ConstraintCast() || + n->Opcode() == Op_Return || + n->Opcode() == Op_Conv2B || + n->is_AddP() || + n->Opcode() == Op_CMoveP || + n->Opcode() == Op_CMoveN || + n->Opcode() == Op_Rethrow || + n->is_MemBar() || + n->is_Mem() || + n->Opcode() == Op_AryEq || + n->Opcode() == Op_SCMemProj || + n->Opcode() == Op_EncodeP || + n->Opcode() == Op_DecodeN || + n->Opcode() == Op_ShenandoahWriteBarrier || + n->Opcode() == Op_ShenandoahWBMemProj || + n->Opcode() == Op_ShenandoahEnqueueBarrier)) { + if (m->bottom_type()->make_oopptr() && m->bottom_type()->make_oopptr()->meet(TypePtr::NULL_PTR) == m->bottom_type()) { + report_verify_failure("Shenandoah verification: null input", n, m); + } + } + + wq.push(m); + } + } + + if (verify_no_useless_barrier) { + for (int i = 0; i < barriers.length(); i++) { + Node* n = barriers.at(i); + if (!barriers_used.member(n)) { + tty->print("XXX useless barrier"); n->dump(-2); + ShouldNotReachHere(); + } + } + } +} +#endif + +bool ShenandoahBarrierNode::is_dominator_same_ctrl(Node*c, Node* d, Node* n, PhaseIdealLoop* phase) { + // That both nodes have the same control is not sufficient to prove + // domination, verify that there's no path from d to n + ResourceMark rm; + Unique_Node_List wq; + wq.push(d); + for (uint next = 0; next < wq.size(); next++) { + Node *m = wq.at(next); + if (m == n) { + return false; + } + if (m->is_Phi() && m->in(0)->is_Loop()) { + assert(phase->ctrl_or_self(m->in(LoopNode::EntryControl)) != c, "following loop entry should lead to new control"); + } else { + for (uint i = 0; i < m->req(); i++) { + if (m->in(i) != NULL && phase->ctrl_or_self(m->in(i)) == c) { + wq.push(m->in(i)); + } + } + } + } + return true; +} + +bool ShenandoahBarrierNode::is_dominator(Node *d_c, Node *n_c, Node* d, Node* n, PhaseIdealLoop* phase) { + if (d_c != n_c) { + return phase->is_dominator(d_c, n_c); + } + return is_dominator_same_ctrl(d_c, d, n, phase); +} + +Node* next_mem(Node* mem, int alias) { + Node* res = NULL; + if (mem->is_Proj()) { + res = mem->in(0); + } else if (mem->is_SafePoint() || mem->is_MemBar()) { + res = mem->in(TypeFunc::Memory); + } else if (mem->is_Phi()) { + res = mem->in(1); + } else if (mem->is_ShenandoahBarrier()) { + res = mem->in(ShenandoahBarrierNode::Memory); + } else if (mem->is_MergeMem()) { + res = mem->as_MergeMem()->memory_at(alias); + } else if (mem->is_Store() || mem->is_LoadStore() || mem->is_ClearArray()) { + assert(alias = Compile::AliasIdxRaw, "following raw memory can't lead to a barrier"); + res = mem->in(MemNode::Memory); + } else if (mem->Opcode() == Op_ShenandoahWBMemProj) { + res = mem->in(ShenandoahWBMemProjNode::WriteBarrier); + } else { +#ifdef ASSERT + mem->dump(); +#endif + ShouldNotReachHere(); + } + return res; +} + +Node* ShenandoahBarrierNode::no_branches(Node* c, Node* dom, bool allow_one_proj, PhaseIdealLoop* phase) { + Node* iffproj = NULL; + while (c != dom) { + Node* next = phase->idom(c); + assert(next->unique_ctrl_out() == c || c->is_Proj() || c->is_Region(), "multiple control flow out but no proj or region?"); + if (c->is_Region()) { + ResourceMark rm; + Unique_Node_List wq; + wq.push(c); + for (uint i = 0; i < wq.size(); i++) { + Node *n = wq.at(i); + if (n == next) { + continue; + } + if (n->is_Region()) { + for (uint j = 1; j < n->req(); j++) { + wq.push(n->in(j)); + } + } else { + wq.push(n->in(0)); + } + } + for (uint i = 0; i < wq.size(); i++) { + Node *n = wq.at(i); + assert(n->is_CFG(), ""); + if (n->is_Multi()) { + for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { + Node* u = n->fast_out(j); + if (u->is_CFG()) { + if (!wq.member(u) && !u->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) { + return NodeSentinel; + } + } + } + } + } + } else if (c->is_Proj()) { + if (c->is_IfProj()) { + if (c->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none) != NULL) { + // continue; + } else { + if (!allow_one_proj) { + return NodeSentinel; + } + if (iffproj == NULL) { + iffproj = c; + } else { + return NodeSentinel; + } + } + } else if (c->Opcode() == Op_JumpProj) { + return NodeSentinel; // unsupported + } else if (c->Opcode() == Op_CatchProj) { + return NodeSentinel; // unsupported + } else if (c->Opcode() == Op_CProj && next->Opcode() == Op_NeverBranch) { + return NodeSentinel; // unsupported + } else { + assert(next->unique_ctrl_out() == c, "unsupported branch pattern"); + } + } + c = next; + } + return iffproj; +} + +bool ShenandoahBarrierNode::build_loop_late_post(PhaseIdealLoop* phase, Node* n) { + if (n->Opcode() == Op_ShenandoahReadBarrier || + n->Opcode() == Op_ShenandoahWriteBarrier || + n->Opcode() == Op_ShenandoahWBMemProj) { + + phase->build_loop_late_post_work(n, false); + + if (n->Opcode() == Op_ShenandoahWriteBarrier) { + // The write barrier and its memory proj must have the same + // control otherwise some loop opts could put nodes (Phis) between + // them + Node* proj = n->find_out_with(Op_ShenandoahWBMemProj); + if (proj != NULL) { + phase->set_ctrl_and_loop(proj, phase->get_ctrl(n)); + } + } + return true; + } + return false; +} + +bool ShenandoahBarrierNode::sink_node(PhaseIdealLoop* phase, Node* ctrl, Node* n_ctrl) { + ctrl = phase->find_non_split_ctrl(ctrl); + assert(phase->dom_depth(n_ctrl) <= phase->dom_depth(ctrl), "n is later than its clone"); + set_req(0, ctrl); + phase->register_new_node(this, ctrl); + return true; +} + +#ifdef ASSERT +void ShenandoahWriteBarrierNode::memory_dominates_all_paths_helper(Node* c, Node* rep_ctrl, Unique_Node_List& controls, PhaseIdealLoop* phase) { + const bool trace = false; + if (trace) { tty->print("X control is"); c->dump(); } + + uint start = controls.size(); + controls.push(c); + for (uint i = start; i < controls.size(); i++) { + Node *n = controls.at(i); + + if (trace) { tty->print("X from"); n->dump(); } + + if (n == rep_ctrl) { + continue; + } + + if (n->is_Proj()) { + Node* n_dom = n->in(0); + IdealLoopTree* n_dom_loop = phase->get_loop(n_dom); + if (n->is_IfProj() && n_dom->outcnt() == 2) { + n_dom_loop = phase->get_loop(n_dom->as_If()->proj_out(n->as_Proj()->_con == 0 ? 1 : 0)); + } + if (n_dom_loop != phase->ltree_root()) { + Node* tail = n_dom_loop->tail(); + if (tail->is_Region()) { + for (uint j = 1; j < tail->req(); j++) { + if (phase->is_dominator(n_dom, tail->in(j)) && !phase->is_dominator(n, tail->in(j))) { + assert(phase->is_dominator(rep_ctrl, tail->in(j)), "why are we here?"); + // entering loop from below, mark backedge + if (trace) { tty->print("X pushing backedge"); tail->in(j)->dump(); } + controls.push(tail->in(j)); + //assert(n->in(0) == n_dom, "strange flow control"); + } + } + } else if (phase->get_loop(n) != n_dom_loop && phase->is_dominator(n_dom, tail)) { + // entering loop from below, mark backedge + if (trace) { tty->print("X pushing backedge"); tail->dump(); } + controls.push(tail); + //assert(n->in(0) == n_dom, "strange flow control"); + } + } + } + + if (n->is_Loop()) { + Node* c = n->in(LoopNode::EntryControl); + if (trace) { tty->print("X pushing"); c->dump(); } + controls.push(c); + } else if (n->is_Region()) { + for (uint i = 1; i < n->req(); i++) { + Node* c = n->in(i); + if (trace) { tty->print("X pushing"); c->dump(); } + controls.push(c); + } + } else { + Node* c = n->in(0); + if (trace) { tty->print("X pushing"); c->dump(); } + controls.push(c); + } + } +} + +bool ShenandoahWriteBarrierNode::memory_dominates_all_paths(Node* mem, Node* rep_ctrl, int alias, PhaseIdealLoop* phase) { + const bool trace = false; + if (trace) { + tty->print("XXX mem is"); mem->dump(); + tty->print("XXX rep ctrl is"); rep_ctrl->dump(); + tty->print_cr("XXX alias is %d", alias); + } + ResourceMark rm; + Unique_Node_List wq; + Unique_Node_List controls; + wq.push(mem); + for (uint next = 0; next < wq.size(); next++) { + Node *nn = wq.at(next); + if (trace) { tty->print("XX from mem"); nn->dump(); } + assert(nn->bottom_type() == Type::MEMORY, "memory only"); + + if (nn->is_Phi()) { + Node* r = nn->in(0); + for (DUIterator_Fast jmax, j = r->fast_outs(jmax); j < jmax; j++) { + Node* u = r->fast_out(j); + if (u->is_Phi() && u->bottom_type() == Type::MEMORY && u != nn && + (u->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(u->adr_type()) == alias)) { + if (trace) { tty->print("XX Next mem (other phi)"); u->dump(); } + wq.push(u); + } + } + } + + for (DUIterator_Fast imax, i = nn->fast_outs(imax); i < imax; i++) { + Node* use = nn->fast_out(i); + + if (trace) { tty->print("XX use %p", use->adr_type()); use->dump(); } + if (use->is_CFG() && use->in(TypeFunc::Memory) == nn) { + Node* c = use->in(0); + if (phase->is_dominator(rep_ctrl, c)) { + memory_dominates_all_paths_helper(c, rep_ctrl, controls, phase); + } else if (use->is_CallStaticJava() && use->as_CallStaticJava()->uncommon_trap_request() != 0 && c->is_Region()) { + Node* region = c; + if (trace) { tty->print("XX unc region"); region->dump(); } + for (uint j = 1; j < region->req(); j++) { + if (phase->is_dominator(rep_ctrl, region->in(j))) { + if (trace) { tty->print("XX unc follows"); region->in(j)->dump(); } + memory_dominates_all_paths_helper(region->in(j), rep_ctrl, controls, phase); + } + } + } + //continue; + } else if (use->is_Phi()) { + assert(use->bottom_type() == Type::MEMORY, "bad phi"); + if ((use->adr_type() == TypePtr::BOTTOM) || + phase->C->get_alias_index(use->adr_type()) == alias) { + for (uint j = 1; j < use->req(); j++) { + if (use->in(j) == nn) { + Node* c = use->in(0)->in(j); + if (phase->is_dominator(rep_ctrl, c)) { + memory_dominates_all_paths_helper(c, rep_ctrl, controls, phase); + } + } + } + } + // continue; + } + + if (use->is_MergeMem()) { + if (use->as_MergeMem()->memory_at(alias) == nn) { + if (trace) { tty->print("XX Next mem"); use->dump(); } + // follow the memory edges + wq.push(use); + } + } else if (use->is_Phi()) { + assert(use->bottom_type() == Type::MEMORY, "bad phi"); + if ((use->adr_type() == TypePtr::BOTTOM) || + phase->C->get_alias_index(use->adr_type()) == alias) { + if (trace) { tty->print("XX Next mem"); use->dump(); } + // follow the memory edges + wq.push(use); + } + } else if (use->bottom_type() == Type::MEMORY && + (use->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(use->adr_type()) == alias)) { + if (trace) { tty->print("XX Next mem"); use->dump(); } + // follow the memory edges + wq.push(use); + } else if ((use->is_SafePoint() || use->is_MemBar()) && + (use->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(use->adr_type()) == alias)) { + for (DUIterator_Fast jmax, j = use->fast_outs(jmax); j < jmax; j++) { + Node* u = use->fast_out(j); + if (u->bottom_type() == Type::MEMORY) { + if (trace) { tty->print("XX Next mem"); u->dump(); } + // follow the memory edges + wq.push(u); + } + } + } else if (use->Opcode() == Op_ShenandoahWriteBarrier && phase->C->get_alias_index(use->adr_type()) == alias) { + Node* m = use->find_out_with(Op_ShenandoahWBMemProj); + if (m != NULL) { + if (trace) { tty->print("XX Next mem"); m->dump(); } + // follow the memory edges + wq.push(m); + } + } + } + } + + if (controls.size() == 0) { + return false; + } + + for (uint i = 0; i < controls.size(); i++) { + Node *n = controls.at(i); + + if (trace) { tty->print("X checking"); n->dump(); } + + if (n->unique_ctrl_out() != NULL) { + continue; + } + + if (n->Opcode() == Op_NeverBranch) { + Node* taken = n->as_Multi()->proj_out(0); + if (!controls.member(taken)) { + if (trace) { tty->print("X not seen"); taken->dump(); } + return false; + } + continue; + } + + for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { + Node* u = n->fast_out(j); + + if (u->is_CFG()) { + if (!controls.member(u)) { + if (u->is_Proj() && u->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) { + if (trace) { tty->print("X not seen but unc"); u->dump(); } + } else { + Node* c = u; + do { + c = c->unique_ctrl_out(); + } while (c != NULL && c->is_Region()); + if (c != NULL && c->Opcode() == Op_Halt) { + if (trace) { tty->print("X not seen but halt"); c->dump(); } + } else { + if (trace) { tty->print("X not seen"); u->dump(); } + return false; + } + } + } else { + if (trace) { tty->print("X seen"); u->dump(); } + } + } + } + } + return true; +} +#endif + +Node* ShenandoahBarrierNode::dom_mem(Node* mem, Node*& mem_ctrl, Node* n, Node* rep_ctrl, int alias, PhaseIdealLoop* phase) { + ResourceMark rm; + VectorSet wq(Thread::current()->resource_area()); + wq.set(mem->_idx); + mem_ctrl = phase->get_ctrl(mem); + while (!is_dominator(mem_ctrl, rep_ctrl, mem, n, phase)) { + mem = next_mem(mem, alias); + if (wq.test_set(mem->_idx)) { + return NULL; // hit an unexpected loop + } + mem_ctrl = phase->ctrl_or_self(mem); + } + if (mem->is_MergeMem()) { + mem = mem->as_MergeMem()->memory_at(alias); + mem_ctrl = phase->ctrl_or_self(mem); + } + return mem; +} + +Node* ShenandoahBarrierNode::dom_mem(Node* mem, Node* ctrl, int alias, Node*& mem_ctrl, PhaseIdealLoop* phase) { + ResourceMark rm; + VectorSet wq(Thread::current()->resource_area()); + wq.set(mem->_idx); + mem_ctrl = phase->ctrl_or_self(mem); + while (!phase->is_dominator(mem_ctrl, ctrl) || mem_ctrl == ctrl) { + mem = next_mem(mem, alias); + if (wq.test_set(mem->_idx)) { + return NULL; + } + mem_ctrl = phase->ctrl_or_self(mem); + } + if (mem->is_MergeMem()) { + mem = mem->as_MergeMem()->memory_at(alias); + mem_ctrl = phase->ctrl_or_self(mem); + } + return mem; +} + +static void disconnect_barrier_mem(Node* wb, PhaseIterGVN& igvn) { + Node* mem_in = wb->in(ShenandoahBarrierNode::Memory); + Node* proj = wb->find_out_with(Op_ShenandoahWBMemProj); + + for (DUIterator_Last imin, i = proj->last_outs(imin); i >= imin; ) { + Node* u = proj->last_out(i); + igvn.rehash_node_delayed(u); + int nb = u->replace_edge(proj, mem_in); + assert(nb > 0, "no replacement?"); + i -= nb; + } +} + +Node* ShenandoahWriteBarrierNode::move_above_predicates(LoopNode* cl, Node* val_ctrl, PhaseIdealLoop* phase) { + Node* entry = cl->skip_strip_mined(-1)->in(LoopNode::EntryControl); + Node* above_pred = phase->skip_all_loop_predicates(entry); + Node* ctrl = entry; + while (ctrl != above_pred) { + Node* next = ctrl->in(0); + if (!phase->is_dominator(val_ctrl, next)) { + break; + } + ctrl = next; + } + return ctrl; +} + +static MemoryGraphFixer* find_fixer(GrowableArray& memory_graph_fixers, int alias) { + for (int i = 0; i < memory_graph_fixers.length(); i++) { + if (memory_graph_fixers.at(i)->alias() == alias) { + return memory_graph_fixers.at(i); + } + } + return NULL; +} + +static MemoryGraphFixer* create_fixer(GrowableArray& memory_graph_fixers, int alias, PhaseIdealLoop* phase, bool include_lsm) { + assert(find_fixer(memory_graph_fixers, alias) == NULL, "none should exist yet"); + MemoryGraphFixer* fixer = new MemoryGraphFixer(alias, include_lsm, phase); + memory_graph_fixers.push(fixer); + return fixer; +} + +void ShenandoahWriteBarrierNode::try_move_before_loop_helper(LoopNode* cl, Node* val_ctrl, GrowableArray& memory_graph_fixers, PhaseIdealLoop* phase, bool include_lsm, Unique_Node_List& uses) { + assert(cl->is_Loop(), "bad control"); + Node* ctrl = move_above_predicates(cl, val_ctrl, phase); + Node* mem_ctrl = NULL; + int alias = phase->C->get_alias_index(adr_type()); + + MemoryGraphFixer* fixer = find_fixer(memory_graph_fixers, alias); + if (fixer == NULL) { + fixer = create_fixer(memory_graph_fixers, alias, phase, include_lsm); + } + + Node* proj = find_out_with(Op_ShenandoahWBMemProj); + + fixer->remove(proj); + Node* mem = fixer->find_mem(ctrl, NULL); + + assert(!ShenandoahVerifyOptoBarriers || memory_dominates_all_paths(mem, ctrl, alias, phase), "can't fix the memory graph"); + + phase->set_ctrl_and_loop(this, ctrl); + phase->igvn().replace_input_of(this, Control, ctrl); + + disconnect_barrier_mem(this, phase->igvn()); + + phase->igvn().replace_input_of(this, Memory, mem); + phase->set_ctrl_and_loop(proj, ctrl); + + fixer->fix_mem(ctrl, ctrl, mem, mem, proj, uses); + assert(proj->outcnt() > 0, "disconnected write barrier"); +} + +LoopNode* ShenandoahWriteBarrierNode::try_move_before_pre_loop(Node* c, Node* val_ctrl, PhaseIdealLoop* phase) { + // A write barrier between a pre and main loop can get in the way of + // vectorization. Move it above the pre loop if possible + CountedLoopNode* cl = NULL; + if (c->is_IfFalse() && + c->in(0)->is_CountedLoopEnd()) { + cl = c->in(0)->as_CountedLoopEnd()->loopnode(); + } else if (c->is_IfProj() && + c->in(0)->is_If() && + c->in(0)->in(0)->is_IfFalse() && + c->in(0)->in(0)->in(0)->is_CountedLoopEnd()) { + cl = c->in(0)->in(0)->in(0)->as_CountedLoopEnd()->loopnode(); + } + if (cl != NULL && + cl->is_pre_loop() && + val_ctrl != cl && + phase->is_dominator(val_ctrl, cl)) { + return cl; + } + return NULL; +} + +void ShenandoahWriteBarrierNode::try_move_before_loop(GrowableArray& memory_graph_fixers, PhaseIdealLoop* phase, bool include_lsm, Unique_Node_List& uses) { + Node *n_ctrl = phase->get_ctrl(this); + IdealLoopTree *n_loop = phase->get_loop(n_ctrl); + Node* val = in(ValueIn); + Node* val_ctrl = phase->get_ctrl(val); + if (n_loop != phase->ltree_root() && !n_loop->_irreducible) { + IdealLoopTree *val_loop = phase->get_loop(val_ctrl); + Node* mem = in(Memory); + IdealLoopTree *mem_loop = phase->get_loop(phase->get_ctrl(mem)); + if (!n_loop->is_member(val_loop) && + n_loop->is_member(mem_loop)) { + Node* n_loop_head = n_loop->_head; + + if (n_loop_head->is_Loop()) { + LoopNode* loop = n_loop_head->as_Loop(); + if (n_loop_head->is_CountedLoop() && n_loop_head->as_CountedLoop()->is_main_loop()) { + LoopNode* res = try_move_before_pre_loop(n_loop_head->in(LoopNode::EntryControl), val_ctrl, phase); + if (res != NULL) { + loop = res; + } + } + + try_move_before_loop_helper(loop, val_ctrl, memory_graph_fixers, phase, include_lsm, uses); + } + } + } + LoopNode* ctrl = try_move_before_pre_loop(in(0), val_ctrl, phase); + if (ctrl != NULL) { + try_move_before_loop_helper(ctrl, val_ctrl, memory_graph_fixers, phase, include_lsm, uses); + } +} + +Node* ShenandoahWriteBarrierNode::would_subsume(ShenandoahBarrierNode* other, PhaseIdealLoop* phase) { + Node* val = in(ValueIn); + Node* val_ctrl = phase->get_ctrl(val); + Node* other_mem = other->in(Memory); + Node* other_ctrl = phase->get_ctrl(other); + Node* this_ctrl = phase->get_ctrl(this); + IdealLoopTree* this_loop = phase->get_loop(this_ctrl); + IdealLoopTree* other_loop = phase->get_loop(other_ctrl); + + Node* ctrl = phase->dom_lca(other_ctrl, this_ctrl); + + if (ctrl->is_Proj() && + ctrl->in(0)->is_Call() && + ctrl->unique_ctrl_out() != NULL && + ctrl->unique_ctrl_out()->Opcode() == Op_Catch && + !phase->is_dominator(val_ctrl, ctrl->in(0)->in(0))) { + return NULL; + } + + IdealLoopTree* loop = phase->get_loop(ctrl); + + // We don't want to move a write barrier in a loop + // If the LCA is in a inner loop, try a control out of loop if possible + while (!loop->is_member(this_loop) && (other->Opcode() != Op_ShenandoahWriteBarrier || !loop->is_member(other_loop))) { + ctrl = phase->idom(ctrl); + if (ctrl->is_MultiBranch()) { + ctrl = ctrl->in(0); + } + if (ctrl != val_ctrl && phase->is_dominator(ctrl, val_ctrl)) { + return NULL; + } + loop = phase->get_loop(ctrl); + } + + if (ShenandoahDontIncreaseWBFreq) { + Node* this_iffproj = no_branches(this_ctrl, ctrl, true, phase); + if (other->Opcode() == Op_ShenandoahWriteBarrier) { + Node* other_iffproj = no_branches(other_ctrl, ctrl, true, phase); + if (other_iffproj == NULL || this_iffproj == NULL) { + return ctrl; + } else if (other_iffproj != NodeSentinel && this_iffproj != NodeSentinel && + other_iffproj->in(0) == this_iffproj->in(0)) { + return ctrl; + } + } else if (this_iffproj == NULL) { + return ctrl; + } + return NULL; + } + + return ctrl; +} + +void ShenandoahWriteBarrierNode::optimize_before_expansion(PhaseIdealLoop* phase, GrowableArray memory_graph_fixers, bool include_lsm) { + bool progress = false; + Unique_Node_List uses; + do { + progress = false; + for (int i = 0; i < ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); i++) { + ShenandoahWriteBarrierNode* wb = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barrier(i); + + wb->try_move_before_loop(memory_graph_fixers, phase, include_lsm, uses); + + Node* val = wb->in(ValueIn); + + for (DUIterator_Fast jmax, j = val->fast_outs(jmax); j < jmax; j++) { + Node* u = val->fast_out(j); + if (u != wb && u->is_ShenandoahBarrier()) { + Node* rep_ctrl = wb->would_subsume(u->as_ShenandoahBarrier(), phase); + + if (rep_ctrl != NULL) { + Node* other = u; + Node* val_ctrl = phase->get_ctrl(val); + if (rep_ctrl->is_Proj() && + rep_ctrl->in(0)->is_Call() && + rep_ctrl->unique_ctrl_out() != NULL && + rep_ctrl->unique_ctrl_out()->Opcode() == Op_Catch) { + rep_ctrl = rep_ctrl->in(0)->in(0); + + assert(phase->is_dominator(val_ctrl, rep_ctrl), "bad control"); + } else { + LoopNode* c = ShenandoahWriteBarrierNode::try_move_before_pre_loop(rep_ctrl, val_ctrl, phase); + if (c != NULL) { + rep_ctrl = ShenandoahWriteBarrierNode::move_above_predicates(c, val_ctrl, phase); + } else { + while (rep_ctrl->is_IfProj()) { + CallStaticJavaNode* unc = rep_ctrl->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none); + if (unc != NULL) { + int req = unc->uncommon_trap_request(); + Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req); + if ((trap_reason == Deoptimization::Reason_loop_limit_check || + trap_reason == Deoptimization::Reason_predicate || + trap_reason == Deoptimization::Reason_profile_predicate) && + phase->is_dominator(val_ctrl, rep_ctrl->in(0)->in(0))) { + rep_ctrl = rep_ctrl->in(0)->in(0); + continue; + } + } + break; + } + } + } + + Node* wb_ctrl = phase->get_ctrl(wb); + Node* other_ctrl = phase->get_ctrl(other); + int alias = phase->C->get_alias_index(wb->adr_type()); + MemoryGraphFixer* fixer = find_fixer(memory_graph_fixers, alias);; + if (!is_dominator(wb_ctrl, other_ctrl, wb, other, phase)) { + if (fixer == NULL) { + fixer = create_fixer(memory_graph_fixers, alias, phase, include_lsm); + } + Node* mem = fixer->find_mem(rep_ctrl, phase->get_ctrl(other) == rep_ctrl ? other : NULL); + + if (mem->has_out_with(Op_Lock) || mem->has_out_with(Op_Unlock)) { + continue; + } + + Node* wb_proj = wb->find_out_with(Op_ShenandoahWBMemProj); + fixer->remove(wb_proj); + Node* mem_for_ctrl = fixer->find_mem(rep_ctrl, NULL); + + if (wb->in(Memory) != mem) { + disconnect_barrier_mem(wb, phase->igvn()); + phase->igvn().replace_input_of(wb, Memory, mem); + } + if (rep_ctrl != wb_ctrl) { + phase->set_ctrl_and_loop(wb, rep_ctrl); + phase->igvn().replace_input_of(wb, Control, rep_ctrl); + phase->set_ctrl_and_loop(wb_proj, rep_ctrl); + progress = true; + } + + fixer->fix_mem(rep_ctrl, rep_ctrl, mem, mem_for_ctrl, wb_proj, uses); + + assert(!ShenandoahVerifyOptoBarriers || ShenandoahWriteBarrierNode::memory_dominates_all_paths(mem, rep_ctrl, alias, phase), "can't fix the memory graph"); + } + + if (other->Opcode() == Op_ShenandoahWriteBarrier) { + Node* other_proj = other->find_out_with(Op_ShenandoahWBMemProj); + if (fixer != NULL) { + fixer->remove(other_proj); + } + phase->igvn().replace_node(other_proj, other->in(Memory)); + } + phase->igvn().replace_node(other, wb); + --j; --jmax; + } + } + } + } + } while(progress); +} + +// Some code duplication with PhaseIdealLoop::split_if_with_blocks_pre() +Node* ShenandoahWriteBarrierNode::try_split_thru_phi(PhaseIdealLoop* phase) { + Node *ctrl = phase->get_ctrl(this); + if (ctrl == NULL) { + return this; + } + Node *blk = phase->has_local_phi_input(this); + if (blk == NULL) { + return this; + } + + if (in(0) != blk) { + return this; + } + + int policy = blk->req() >> 2; + + if (blk->is_CountedLoop()) { + IdealLoopTree *lp = phase->get_loop(blk); + if (lp && lp->_rce_candidate) { + return this; + } + } + + if (phase->C->live_nodes() > 35000) { + return this; + } + + uint unique = phase->C->unique(); + Node *phi = phase->split_thru_phi(this, blk, policy); + if (phi == NULL) { + return this; + } + + Node* mem_phi = new PhiNode(blk, Type::MEMORY, phase->C->alias_type(adr_type())->adr_type()); + for (uint i = 1; i < blk->req(); i++) { + Node* n = phi->in(i); + if (n->Opcode() == Op_ShenandoahWriteBarrier && + n->_idx >= unique) { + Node* proj = new ShenandoahWBMemProjNode(n); + phase->register_new_node(proj, phase->get_ctrl(n)); + mem_phi->init_req(i, proj); + } else { + Node* mem = in(ShenandoahBarrierNode::Memory); + if (mem->is_Phi() && mem->in(0) == blk) { + mem = mem->in(i); + } + mem_phi->init_req(i, mem); + } + } + phase->register_new_node(mem_phi, blk); + + + Node* proj = find_out_with(Op_ShenandoahWBMemProj); + phase->igvn().replace_node(proj, mem_phi); + phase->igvn().replace_node(this, phi); + + return phi; +} + +void ShenandoahReadBarrierNode::try_move(PhaseIdealLoop* phase) { + Node *n_ctrl = phase->get_ctrl(this); + if (n_ctrl == NULL) { + return; + } + Node* mem = in(MemNode::Memory); + int alias = phase->C->get_alias_index(adr_type()); + const bool trace = false; + +#ifdef ASSERT + if (trace) { tty->print("Trying to move mem of"); dump(); } +#endif + + Node* new_mem = mem; + + ResourceMark rm; + VectorSet seen(Thread::current()->resource_area()); + Node_List phis; + + for (;;) { +#ifdef ASSERT + if (trace) { tty->print("Looking for dominator from"); mem->dump(); } +#endif + if (mem->is_Proj() && mem->in(0)->is_Start()) { + if (new_mem != in(MemNode::Memory)) { +#ifdef ASSERT + if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); } +#endif + phase->igvn().replace_input_of(this, MemNode::Memory, new_mem); + } + return; + } + + Node* candidate = mem; + do { + if (!is_independent(mem)) { + if (trace) { tty->print_cr("Not independent"); } + if (new_mem != in(MemNode::Memory)) { +#ifdef ASSERT + if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); } +#endif + phase->igvn().replace_input_of(this, MemNode::Memory, new_mem); + } + return; + } + if (seen.test_set(mem->_idx)) { + if (trace) { tty->print_cr("Already seen"); } + ShouldNotReachHere(); + // Strange graph + if (new_mem != in(MemNode::Memory)) { +#ifdef ASSERT + if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); } +#endif + phase->igvn().replace_input_of(this, MemNode::Memory, new_mem); + } + return; + } + if (mem->is_Phi()) { + phis.push(mem); + } + mem = next_mem(mem, alias); + if (mem->bottom_type() == Type::MEMORY) { + candidate = mem; + } + assert(is_dominator(phase->ctrl_or_self(mem), n_ctrl, mem, this, phase) == phase->is_dominator(phase->ctrl_or_self(mem), n_ctrl), "strange dominator"); +#ifdef ASSERT + if (trace) { tty->print("Next mem is"); mem->dump(); } +#endif + } while (mem->bottom_type() != Type::MEMORY || !phase->is_dominator(phase->ctrl_or_self(mem), n_ctrl)); + + assert(mem->bottom_type() == Type::MEMORY, "bad mem"); + + bool not_dom = false; + for (uint i = 0; i < phis.size() && !not_dom; i++) { + Node* nn = phis.at(i); + +#ifdef ASSERT + if (trace) { tty->print("Looking from phi"); nn->dump(); } +#endif + assert(nn->is_Phi(), "phis only"); + for (uint j = 2; j < nn->req() && !not_dom; j++) { + Node* m = nn->in(j); +#ifdef ASSERT + if (trace) { tty->print("Input %d is", j); m->dump(); } +#endif + while (m != mem && !seen.test_set(m->_idx)) { + if (is_dominator(phase->ctrl_or_self(m), phase->ctrl_or_self(mem), m, mem, phase)) { + not_dom = true; + // Scheduling anomaly +#ifdef ASSERT + if (trace) { tty->print("Giving up"); m->dump(); } +#endif + break; + } + if (!is_independent(m)) { + if (trace) { tty->print_cr("Not independent"); } + if (new_mem != in(MemNode::Memory)) { +#ifdef ASSERT + if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); } +#endif + phase->igvn().replace_input_of(this, MemNode::Memory, new_mem); + } + return; + } + if (m->is_Phi()) { + phis.push(m); + } + m = next_mem(m, alias); +#ifdef ASSERT + if (trace) { tty->print("Next mem is"); m->dump(); } +#endif + } + } + } + if (!not_dom) { + new_mem = mem; + phis.clear(); + } else { + seen.Clear(); + } + } +} + +CallStaticJavaNode* ShenandoahWriteBarrierNode::pin_and_expand_null_check(PhaseIterGVN& igvn) { + Node* val = in(ValueIn); + + const Type* val_t = igvn.type(val); + + if (val_t->meet(TypePtr::NULL_PTR) != val_t && + val->Opcode() == Op_CastPP && + val->in(0) != NULL && + val->in(0)->Opcode() == Op_IfTrue && + val->in(0)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none) && + val->in(0)->in(0)->is_If() && + val->in(0)->in(0)->in(1)->Opcode() == Op_Bool && + val->in(0)->in(0)->in(1)->as_Bool()->_test._test == BoolTest::ne && + val->in(0)->in(0)->in(1)->in(1)->Opcode() == Op_CmpP && + val->in(0)->in(0)->in(1)->in(1)->in(1) == val->in(1) && + val->in(0)->in(0)->in(1)->in(1)->in(2)->bottom_type() == TypePtr::NULL_PTR) { + assert(val->in(0)->in(0)->in(1)->in(1)->in(1) == val->in(1), ""); + CallStaticJavaNode* unc = val->in(0)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none); + return unc; + } + return NULL; +} + +void ShenandoahWriteBarrierNode::pin_and_expand_move_barrier(PhaseIdealLoop* phase, GrowableArray& memory_graph_fixers, Unique_Node_List& uses) { + Node* unc = pin_and_expand_null_check(phase->igvn()); + Node* val = in(ValueIn); + + if (unc != NULL) { + Node* ctrl = phase->get_ctrl(this); + Node* unc_ctrl = val->in(0); + + // Don't move write barrier in a loop + IdealLoopTree* loop = phase->get_loop(ctrl); + IdealLoopTree* unc_loop = phase->get_loop(unc_ctrl); + + if (!unc_loop->is_member(loop)) { + return; + } + + Node* branch = no_branches(ctrl, unc_ctrl, false, phase); + assert(branch == NULL || branch == NodeSentinel, "was not looking for a branch"); + if (branch == NodeSentinel) { + return; + } + + RegionNode* r = new RegionNode(3); + IfNode* iff = unc_ctrl->in(0)->as_If(); + + Node* ctrl_use = unc_ctrl->unique_ctrl_out(); + Node* unc_ctrl_clone = unc_ctrl->clone(); + phase->register_control(unc_ctrl_clone, loop, iff); + Node* c = unc_ctrl_clone; + Node* new_cast = clone_null_check(c, val, unc_ctrl_clone, phase); + r->init_req(1, new_cast->in(0)->in(0)->as_If()->proj_out(0)); + + phase->igvn().replace_input_of(unc_ctrl, 0, c->in(0)); + phase->set_idom(unc_ctrl, c->in(0), phase->dom_depth(unc_ctrl)); + phase->lazy_replace(c, unc_ctrl); + c = NULL;; + phase->igvn().replace_input_of(val, 0, unc_ctrl_clone); + phase->set_ctrl(val, unc_ctrl_clone); + + IfNode* new_iff = new_cast->in(0)->in(0)->as_If(); + fix_null_check(unc, unc_ctrl_clone, r, uses, phase); + Node* iff_proj = iff->proj_out(0); + r->init_req(2, iff_proj); + phase->register_control(r, phase->ltree_root(), iff); + + Node* new_bol = new_iff->in(1)->clone(); + Node* new_cmp = new_bol->in(1)->clone(); + assert(new_cmp->Opcode() == Op_CmpP, "broken"); + assert(new_cmp->in(1) == val->in(1), "broken"); + new_bol->set_req(1, new_cmp); + new_cmp->set_req(1, this); + phase->register_new_node(new_bol, new_iff->in(0)); + phase->register_new_node(new_cmp, new_iff->in(0)); + phase->igvn().replace_input_of(new_iff, 1, new_bol); + phase->igvn().replace_input_of(new_cast, 1, this); + + for (DUIterator_Fast imax, i = this->fast_outs(imax); i < imax; i++) { + Node* u = this->fast_out(i); + if (u == new_cast || u->Opcode() == Op_ShenandoahWBMemProj || u == new_cmp) { + continue; + } + phase->igvn().rehash_node_delayed(u); + int nb = u->replace_edge(this, new_cast); + assert(nb > 0, "no update?"); + --i; imax -= nb; + } + + for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) { + Node* u = val->fast_out(i); + if (u == this) { + continue; + } + phase->igvn().rehash_node_delayed(u); + int nb = u->replace_edge(val, new_cast); + assert(nb > 0, "no update?"); + --i; imax -= nb; + } + + Node* new_ctrl = unc_ctrl_clone; + + int alias = phase->C->get_alias_index(adr_type()); + MemoryGraphFixer* fixer = find_fixer(memory_graph_fixers, alias); + if (fixer == NULL) { + fixer = create_fixer(memory_graph_fixers, alias, phase, true); + } + + Node* proj = find_out_with(Op_ShenandoahWBMemProj); + fixer->remove(proj); + Node* mem = fixer->find_mem(new_ctrl, NULL); + + if (in(Memory) != mem) { + disconnect_barrier_mem(this, phase->igvn()); + phase->igvn().replace_input_of(this, Memory, mem); + } + + phase->set_ctrl_and_loop(this, new_ctrl); + phase->igvn().replace_input_of(this, Control, new_ctrl); + phase->set_ctrl_and_loop(proj, new_ctrl); + + fixer->fix_mem(new_ctrl, new_ctrl, mem, mem, proj, uses); + } +} + +void ShenandoahWriteBarrierNode::pin_and_expand_helper(PhaseIdealLoop* phase) { + Node* val = in(ValueIn); + CallStaticJavaNode* unc = pin_and_expand_null_check(phase->igvn()); + Node* rep = this; + Node* ctrl = phase->get_ctrl(this); + if (unc != NULL && val->in(0) == ctrl) { + Node* unc_ctrl = val->in(0); + IfNode* other_iff = unc_ctrl->unique_ctrl_out()->as_If(); + ProjNode* other_unc_ctrl = other_iff->proj_out(1); + Node* cast = NULL; + for (DUIterator_Fast imax, i = other_unc_ctrl->fast_outs(imax); i < imax && cast == NULL; i++) { + Node* u = other_unc_ctrl->fast_out(i); + if (u->Opcode() == Op_CastPP && u->in(1) == this) { + cast = u; + } + } + assert(other_unc_ctrl->is_uncommon_trap_if_pattern(Deoptimization::Reason_none) == unc, "broken"); + rep = cast; + } + + // Replace all uses of barrier's input that are dominated by ctrl + // with the value returned by the barrier: no need to keep both + // live. + for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) { + Node* u = val->fast_out(i); + if (u != this) { + if (u->is_Phi()) { + int nb = 0; + for (uint j = 1; j < u->req(); j++) { + if (u->in(j) == val) { + Node* c = u->in(0)->in(j); + if (phase->is_dominator(ctrl, c)) { + phase->igvn().replace_input_of(u, j, rep); + nb++; + } + } + } + if (nb > 0) { + imax -= nb; + --i; + } + } else { + Node* c = phase->ctrl_or_self(u); + if (is_dominator(ctrl, c, this, u, phase)) { + phase->igvn().rehash_node_delayed(u); + int nb = u->replace_edge(val, rep); + assert(nb > 0, "no update?"); + --i, imax -= nb; + } + } + } + } +} + +Node* ShenandoahWriteBarrierNode::find_bottom_mem(Node* ctrl, PhaseIdealLoop* phase) { + Node* mem = NULL; + Node* c = ctrl; + do { + if (c->is_Region()) { + Node* phi_bottom = NULL; + for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax && mem == NULL; i++) { + Node* u = c->fast_out(i); + if (u->is_Phi() && u->bottom_type() == Type::MEMORY) { + if (u->adr_type() == TypePtr::BOTTOM) { + mem = u; + } + } + } + } else { + if (c->is_Call() && c->as_Call()->adr_type() != NULL) { + CallProjections projs; + c->as_Call()->extract_projections(&projs, true, false); + if (projs.fallthrough_memproj != NULL) { + if (projs.fallthrough_memproj->adr_type() == TypePtr::BOTTOM) { + if (projs.catchall_memproj == NULL) { + mem = projs.fallthrough_memproj; + } else { + if (phase->is_dominator(projs.fallthrough_catchproj, ctrl)) { + mem = projs.fallthrough_memproj; + } else { + assert(phase->is_dominator(projs.catchall_catchproj, ctrl), "one proj must dominate barrier"); + mem = projs.catchall_memproj; + } + } + } + } else { + Node* proj = c->as_Call()->proj_out(TypeFunc::Memory); + if (proj != NULL && + proj->adr_type() == TypePtr::BOTTOM) { + mem = proj; + } + } + } else { + for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax; i++) { + Node* u = c->fast_out(i); + if (u->is_Proj() && + u->bottom_type() == Type::MEMORY && + u->adr_type() == TypePtr::BOTTOM) { + assert(c->is_SafePoint() || c->is_MemBar() || c->is_Start(), ""); + assert(mem == NULL, "only one proj"); + mem = u; + } + } + assert(!c->is_Call() || c->as_Call()->adr_type() != NULL || mem == NULL, "no mem projection expected"); + } + } + c = phase->idom(c); + } while (mem == NULL); + return mem; +} + +void ShenandoahWriteBarrierNode::follow_barrier_uses(Node* n, Node* ctrl, Unique_Node_List& uses, PhaseIdealLoop* phase) { + for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { + Node* u = n->fast_out(i); + if (!u->is_CFG() && phase->get_ctrl(u) == ctrl && (!u->is_Phi() || !u->in(0)->is_Loop() || u->in(LoopNode::LoopBackControl) != n)) { + uses.push(u); + } + } +} + +static void hide_strip_mined_loop(OuterStripMinedLoopNode* outer, CountedLoopNode* inner, PhaseIdealLoop* phase) { + OuterStripMinedLoopEndNode* le = inner->outer_loop_end(); + Node* new_outer = new LoopNode(outer->in(LoopNode::EntryControl), outer->in(LoopNode::LoopBackControl)); + phase->register_control(new_outer, phase->get_loop(outer), outer->in(LoopNode::EntryControl)); + Node* new_le = new IfNode(le->in(0), le->in(1), le->_prob, le->_fcnt); + phase->register_control(new_le, phase->get_loop(le), le->in(0)); + phase->lazy_replace(outer, new_outer); + phase->lazy_replace(le, new_le); + inner->clear_strip_mined(); +} + +void ShenandoahWriteBarrierNode::test_heap_stable(Node*& ctrl, Node* raw_mem, Node*& heap_stable_ctrl, + PhaseIdealLoop* phase) { + IdealLoopTree* loop = phase->get_loop(ctrl); + Node* thread = new ThreadLocalNode(); + phase->register_new_node(thread, ctrl); + Node* offset = phase->igvn().MakeConX(in_bytes(ShenandoahThreadLocalData::gc_state_offset())); + phase->set_ctrl(offset, phase->C->root()); + Node* gc_state_addr = new AddPNode(phase->C->top(), thread, offset); + phase->register_new_node(gc_state_addr, ctrl); + uint gc_state_idx = Compile::AliasIdxRaw; + const TypePtr* gc_state_adr_type = NULL; // debug-mode-only argument + debug_only(gc_state_adr_type = phase->C->get_adr_type(gc_state_idx)); + + Node* gc_state = new LoadBNode(ctrl, raw_mem, gc_state_addr, gc_state_adr_type, TypeInt::BYTE, MemNode::unordered); + phase->register_new_node(gc_state, ctrl); + Node* heap_stable_and = new AndINode(gc_state, phase->igvn().intcon(ShenandoahHeap::HAS_FORWARDED)); + phase->register_new_node(heap_stable_and, ctrl); + Node* heap_stable_cmp = new CmpINode(heap_stable_and, phase->igvn().zerocon(T_INT)); + phase->register_new_node(heap_stable_cmp, ctrl); + Node* heap_stable_test = new BoolNode(heap_stable_cmp, BoolTest::ne); + phase->register_new_node(heap_stable_test, ctrl); + IfNode* heap_stable_iff = new IfNode(ctrl, heap_stable_test, PROB_UNLIKELY(0.999), COUNT_UNKNOWN); + phase->register_control(heap_stable_iff, loop, ctrl); + + heap_stable_ctrl = new IfFalseNode(heap_stable_iff); + phase->register_control(heap_stable_ctrl, loop, heap_stable_iff); + ctrl = new IfTrueNode(heap_stable_iff); + phase->register_control(ctrl, loop, heap_stable_iff); + + assert(is_heap_stable_test(heap_stable_iff), "Should match the shape"); +} + +void ShenandoahWriteBarrierNode::test_null(Node*& ctrl, Node* val, Node*& null_ctrl, PhaseIdealLoop* phase) { + const Type* val_t = phase->igvn().type(val); + if (val_t->meet(TypePtr::NULL_PTR) == val_t) { + IdealLoopTree* loop = phase->get_loop(ctrl); + Node* null_cmp = new CmpPNode(val, phase->igvn().zerocon(T_OBJECT)); + phase->register_new_node(null_cmp, ctrl); + Node* null_test = new BoolNode(null_cmp, BoolTest::ne); + phase->register_new_node(null_test, ctrl); + IfNode* null_iff = new IfNode(ctrl, null_test, PROB_LIKELY(0.999), COUNT_UNKNOWN); + phase->register_control(null_iff, loop, ctrl); + ctrl = new IfTrueNode(null_iff); + phase->register_control(ctrl, loop, null_iff); + null_ctrl = new IfFalseNode(null_iff); + phase->register_control(null_ctrl, loop, null_iff); + } +} + +Node* ShenandoahWriteBarrierNode::clone_null_check(Node*& c, Node* val, Node* unc_ctrl, PhaseIdealLoop* phase) { + IdealLoopTree *loop = phase->get_loop(c); + Node* iff = unc_ctrl->in(0); + assert(iff->is_If(), "broken"); + Node* new_iff = iff->clone(); + new_iff->set_req(0, c); + phase->register_control(new_iff, loop, c); + Node* iffalse = new IfFalseNode(new_iff->as_If()); + phase->register_control(iffalse, loop, new_iff); + Node* iftrue = new IfTrueNode(new_iff->as_If()); + phase->register_control(iftrue, loop, new_iff); + c = iftrue; + const Type *t = phase->igvn().type(val); + assert(val->Opcode() == Op_CastPP, "expect cast to non null here"); + Node* uncasted_val = val->in(1); + val = new CastPPNode(uncasted_val, t); + val->init_req(0, c); + phase->register_new_node(val, c); + return val; +} + +void ShenandoahWriteBarrierNode::fix_null_check(Node* unc, Node* unc_ctrl, Node* new_unc_ctrl, + Unique_Node_List& uses, PhaseIdealLoop* phase) { + IfNode* iff = unc_ctrl->in(0)->as_If(); + Node* proj = iff->proj_out(0); + assert(proj != unc_ctrl, "bad projection"); + Node* use = proj->unique_ctrl_out(); + + assert(use == unc || use->is_Region(), "what else?"); + + uses.clear(); + if (use == unc) { + phase->set_idom(use, new_unc_ctrl, phase->dom_depth(use)); + for (uint i = 1; i < unc->req(); i++) { + Node* n = unc->in(i); + if (phase->has_ctrl(n) && phase->get_ctrl(n) == proj) { + uses.push(n); + } + } + } else { + assert(use->is_Region(), "what else?"); + uint idx = 1; + for (; use->in(idx) != proj; idx++); + for (DUIterator_Fast imax, i = use->fast_outs(imax); i < imax; i++) { + Node* u = use->fast_out(i); + if (u->is_Phi() && phase->get_ctrl(u->in(idx)) == proj) { + uses.push(u->in(idx)); + } + } + } + for(uint next = 0; next < uses.size(); next++ ) { + Node *n = uses.at(next); + assert(phase->get_ctrl(n) == proj, "bad control"); + phase->set_ctrl_and_loop(n, new_unc_ctrl); + if (n->in(0) == proj) { + phase->igvn().replace_input_of(n, 0, new_unc_ctrl); + } + for (uint i = 0; i < n->req(); i++) { + Node* m = n->in(i); + if (m != NULL && phase->has_ctrl(m) && phase->get_ctrl(m) == proj) { + uses.push(m); + } + } + } + + phase->igvn().rehash_node_delayed(use); + int nb = use->replace_edge(proj, new_unc_ctrl); + assert(nb == 1, "only use expected"); +} + +void ShenandoahWriteBarrierNode::in_cset_fast_test(Node*& ctrl, Node*& not_cset_ctrl, Node* val, Node* raw_mem, PhaseIdealLoop* phase) { + IdealLoopTree *loop = phase->get_loop(ctrl); + Node* raw_rbtrue = new CastP2XNode(ctrl, val); + phase->register_new_node(raw_rbtrue, ctrl); + Node* cset_offset = new URShiftXNode(raw_rbtrue, phase->igvn().intcon(ShenandoahHeapRegion::region_size_bytes_shift_jint())); + phase->register_new_node(cset_offset, ctrl); + Node* in_cset_fast_test_base_addr = phase->igvn().makecon(TypeRawPtr::make(ShenandoahHeap::in_cset_fast_test_addr())); + phase->set_ctrl(in_cset_fast_test_base_addr, phase->C->root()); + Node* in_cset_fast_test_adr = new AddPNode(phase->C->top(), in_cset_fast_test_base_addr, cset_offset); + phase->register_new_node(in_cset_fast_test_adr, ctrl); + uint in_cset_fast_test_idx = Compile::AliasIdxRaw; + const TypePtr* in_cset_fast_test_adr_type = NULL; // debug-mode-only argument + debug_only(in_cset_fast_test_adr_type = phase->C->get_adr_type(in_cset_fast_test_idx)); + Node* in_cset_fast_test_load = new LoadBNode(ctrl, raw_mem, in_cset_fast_test_adr, in_cset_fast_test_adr_type, TypeInt::BYTE, MemNode::unordered); + phase->register_new_node(in_cset_fast_test_load, ctrl); + Node* in_cset_fast_test_cmp = new CmpINode(in_cset_fast_test_load, phase->igvn().zerocon(T_INT)); + phase->register_new_node(in_cset_fast_test_cmp, ctrl); + Node* in_cset_fast_test_test = new BoolNode(in_cset_fast_test_cmp, BoolTest::eq); + phase->register_new_node(in_cset_fast_test_test, ctrl); + IfNode* in_cset_fast_test_iff = new IfNode(ctrl, in_cset_fast_test_test, PROB_UNLIKELY(0.999), COUNT_UNKNOWN); + phase->register_control(in_cset_fast_test_iff, loop, ctrl); + + not_cset_ctrl = new IfTrueNode(in_cset_fast_test_iff); + phase->register_control(not_cset_ctrl, loop, in_cset_fast_test_iff); + + ctrl = new IfFalseNode(in_cset_fast_test_iff); + phase->register_control(ctrl, loop, in_cset_fast_test_iff); +} + +void ShenandoahWriteBarrierNode::call_wb_stub(Node*& ctrl, Node*& val, Node*& result_mem, + Node* raw_mem, Node* wb_mem, + int alias, + PhaseIdealLoop* phase) { + IdealLoopTree*loop = phase->get_loop(ctrl); + const TypePtr* obj_type = phase->igvn().type(val)->is_oopptr()->cast_to_nonconst(); + + // The slow path stub consumes and produces raw memory in addition + // to the existing memory edges + Node* base = find_bottom_mem(ctrl, phase); + + MergeMemNode* mm = MergeMemNode::make(base); + mm->set_memory_at(alias, wb_mem); + mm->set_memory_at(Compile::AliasIdxRaw, raw_mem); + phase->register_new_node(mm, ctrl); + + Node* call = new CallLeafNode(ShenandoahBarrierSetC2::shenandoah_write_barrier_Type(), CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_barrier_JRT), "shenandoah_write_barrier", TypeRawPtr::BOTTOM); + call->init_req(TypeFunc::Control, ctrl); + call->init_req(TypeFunc::I_O, phase->C->top()); + call->init_req(TypeFunc::Memory, mm); + call->init_req(TypeFunc::FramePtr, phase->C->top()); + call->init_req(TypeFunc::ReturnAdr, phase->C->top()); + call->init_req(TypeFunc::Parms, val); + phase->register_control(call, loop, ctrl); + ctrl = new ProjNode(call, TypeFunc::Control); + phase->register_control(ctrl, loop, call); + result_mem = new ProjNode(call, TypeFunc::Memory); + phase->register_new_node(result_mem, call); + val = new ProjNode(call, TypeFunc::Parms); + phase->register_new_node(val, call); + val = new CheckCastPPNode(ctrl, val, obj_type); + phase->register_new_node(val, ctrl); +} + +void ShenandoahWriteBarrierNode::fix_ctrl(Node* barrier, Node* region, const MemoryGraphFixer& fixer, Unique_Node_List& uses, Unique_Node_List& uses_to_ignore, uint last, PhaseIdealLoop* phase) { + Node* ctrl = phase->get_ctrl(barrier); + Node* init_raw_mem = fixer.find_mem(ctrl, barrier); + + // Update the control of all nodes that should be after the + // barrier control flow + uses.clear(); + // Every node that is control dependent on the barrier's input + // control will be after the expanded barrier. The raw memory (if + // its memory is control dependent on the barrier's input control) + // must stay above the barrier. + uses_to_ignore.clear(); + if (phase->has_ctrl(init_raw_mem) && phase->get_ctrl(init_raw_mem) == ctrl && !init_raw_mem->is_Phi()) { + uses_to_ignore.push(init_raw_mem); + } + for (uint next = 0; next < uses_to_ignore.size(); next++) { + Node *n = uses_to_ignore.at(next); + for (uint i = 0; i < n->req(); i++) { + Node* in = n->in(i); + if (in != NULL && phase->has_ctrl(in) && phase->get_ctrl(in) == ctrl) { + uses_to_ignore.push(in); + } + } + } + for (DUIterator_Fast imax, i = ctrl->fast_outs(imax); i < imax; i++) { + Node* u = ctrl->fast_out(i); + if (u->_idx < last && + u != barrier && + !uses_to_ignore.member(u) && + (u->in(0) != ctrl || (!u->is_Region() && !u->is_Phi())) && + (ctrl->Opcode() != Op_CatchProj || u->Opcode() != Op_CreateEx)) { + Node* old_c = phase->ctrl_or_self(u); + Node* c = old_c; + if (c != ctrl || + is_dominator_same_ctrl(old_c, barrier, u, phase) || + ShenandoahBarrierSetC2::is_shenandoah_state_load(u)) { + phase->igvn().rehash_node_delayed(u); + int nb = u->replace_edge(ctrl, region); + if (u->is_CFG()) { + if (phase->idom(u) == ctrl) { + phase->set_idom(u, region, phase->dom_depth(region)); + } + } else if (phase->get_ctrl(u) == ctrl) { + assert(u != init_raw_mem, "should leave input raw mem above the barrier"); + uses.push(u); + } + assert(nb == 1, "more than 1 ctrl input?"); + --i, imax -= nb; + } + } + } +} + +void ShenandoahWriteBarrierNode::pin_and_expand(PhaseIdealLoop* phase) { + Node_List enqueue_barriers; + if (ShenandoahStoreValEnqueueBarrier) { + Unique_Node_List wq; + wq.push(phase->C->root()); + for (uint i = 0; i < wq.size(); i++) { + Node* n = wq.at(i); + if (n->Opcode() == Op_ShenandoahEnqueueBarrier) { + enqueue_barriers.push(n); + } + for (uint i = 0; i < n->req(); i++) { + Node* in = n->in(i); + if (in != NULL) { + wq.push(in); + } + } + } + } + + const bool trace = false; + + // Collect raw memory state at CFG points in the entire graph and + // record it in memory_nodes. Optimize the raw memory graph in the + // process. Optimizing the memory graph also makes the memory graph + // simpler. + GrowableArray memory_graph_fixers; + + // Let's try to common write barriers again + optimize_before_expansion(phase, memory_graph_fixers, true); + + Unique_Node_List uses; + for (int i = 0; i < ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); i++) { + ShenandoahWriteBarrierNode* wb = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barrier(i); + Node* ctrl = phase->get_ctrl(wb); + + Node* val = wb->in(ValueIn); + if (ctrl->is_Proj() && ctrl->in(0)->is_CallJava()) { + assert(is_dominator(phase->get_ctrl(val), ctrl->in(0)->in(0), val, ctrl->in(0), phase), "can't move"); + phase->set_ctrl(wb, ctrl->in(0)->in(0)); + } else if (ctrl->is_CallRuntime()) { + assert(is_dominator(phase->get_ctrl(val), ctrl->in(0), val, ctrl, phase), "can't move"); + phase->set_ctrl(wb, ctrl->in(0)); + } + + assert(wb->Opcode() == Op_ShenandoahWriteBarrier, "only for write barriers"); + // Look for a null check that dominates this barrier and move the + // barrier right after the null check to enable implicit null + // checks + wb->pin_and_expand_move_barrier(phase, memory_graph_fixers, uses); + + wb->pin_and_expand_helper(phase); + } + + MemoryGraphFixer fixer(Compile::AliasIdxRaw, true, phase); + Unique_Node_List uses_to_ignore; + Unique_Node_List outer_lsms; + for (uint i = 0; i < enqueue_barriers.size(); i++) { + Node* barrier = enqueue_barriers.at(i); + Node* pre_val = barrier->in(1); + + if (phase->igvn().type(pre_val)->higher_equal(TypePtr::NULL_PTR)) { + ShouldNotReachHere(); + continue; + } + + Node* ctrl = phase->get_ctrl(barrier); + + if (ctrl->is_Proj() && ctrl->in(0)->is_CallJava()) { + assert(is_dominator(phase->get_ctrl(pre_val), ctrl->in(0)->in(0), pre_val, ctrl->in(0), phase), "can't move"); + ctrl = ctrl->in(0)->in(0); + phase->set_ctrl(barrier, ctrl); + } else if (ctrl->is_CallRuntime()) { + assert(is_dominator(phase->get_ctrl(pre_val), ctrl->in(0), pre_val, ctrl, phase), "can't move"); + ctrl = ctrl->in(0); + phase->set_ctrl(barrier, ctrl); + } + + Node* init_ctrl = ctrl; + IdealLoopTree* loop = phase->get_loop(ctrl); + if (loop->_head->is_OuterStripMinedLoop()) { + outer_lsms.push(loop->_head); + } + Node* raw_mem = fixer.find_mem(ctrl, barrier); + Node* init_raw_mem = raw_mem; + Node* raw_mem_for_ctrl = fixer.find_mem(ctrl, NULL); + Node* heap_stable_ctrl = NULL; + Node* null_ctrl = NULL; + uint last = phase->C->unique(); + + enum { _heap_stable = 1, _heap_unstable, PATH_LIMIT }; + Node* region = new RegionNode(PATH_LIMIT); + Node* phi = PhiNode::make(region, raw_mem, Type::MEMORY, TypeRawPtr::BOTTOM); + + enum { _fast_path = 1, _slow_path, _null_path, PATH_LIMIT2 }; + Node* region2 = new RegionNode(PATH_LIMIT2); + Node* phi2 = PhiNode::make(region2, raw_mem, Type::MEMORY, TypeRawPtr::BOTTOM); + + // Stable path. + test_heap_stable(ctrl, raw_mem, heap_stable_ctrl, phase); + region->init_req(_heap_stable, heap_stable_ctrl); + phi->init_req(_heap_stable, raw_mem); + + // Null path + Node* reg2_ctrl = NULL; + test_null(ctrl, pre_val, null_ctrl, phase); + if (null_ctrl != NULL) { + reg2_ctrl = null_ctrl->in(0); + region2->init_req(_null_path, null_ctrl); + phi2->init_req(_null_path, raw_mem); + } else { + region2->del_req(_null_path); + phi2->del_req(_null_path); + } + + const int index_offset = in_bytes(ShenandoahThreadLocalData::satb_mark_queue_index_offset()); + const int buffer_offset = in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset()); + Node* thread = new ThreadLocalNode(); + phase->register_new_node(thread, ctrl); + Node* buffer_adr = new AddPNode(phase->C->top(), thread, phase->igvn().MakeConX(buffer_offset)); + phase->register_new_node(buffer_adr, ctrl); + Node* index_adr = new AddPNode(phase->C->top(), thread, phase->igvn().MakeConX(index_offset)); + phase->register_new_node(index_adr, ctrl); + + BasicType index_bt = TypeX_X->basic_type(); + assert(sizeof(size_t) == type2aelembytes(index_bt), "Loading G1 SATBMarkQueue::_index with wrong size."); + const TypePtr* adr_type = TypeRawPtr::BOTTOM; + Node* index = new LoadXNode(ctrl, raw_mem, index_adr, adr_type, TypeX_X, MemNode::unordered); + phase->register_new_node(index, ctrl); + Node* index_cmp = new CmpXNode(index, phase->igvn().MakeConX(0)); + phase->register_new_node(index_cmp, ctrl); + Node* index_test = new BoolNode(index_cmp, BoolTest::ne); + phase->register_new_node(index_test, ctrl); + IfNode* queue_full_iff = new IfNode(ctrl, index_test, PROB_LIKELY(0.999), COUNT_UNKNOWN); + if (reg2_ctrl == NULL) reg2_ctrl = queue_full_iff; + phase->register_control(queue_full_iff, loop, ctrl); + Node* not_full = new IfTrueNode(queue_full_iff); + phase->register_control(not_full, loop, queue_full_iff); + Node* full = new IfFalseNode(queue_full_iff); + phase->register_control(full, loop, queue_full_iff); + + ctrl = not_full; + + Node* next_index = new SubXNode(index, phase->igvn().MakeConX(sizeof(intptr_t))); + phase->register_new_node(next_index, ctrl); + + Node* buffer = new LoadPNode(ctrl, raw_mem, buffer_adr, adr_type, TypeRawPtr::NOTNULL, MemNode::unordered); + phase->register_new_node(buffer, ctrl); + Node *log_addr = new AddPNode(phase->C->top(), buffer, next_index); + phase->register_new_node(log_addr, ctrl); + Node* log_store = new StorePNode(ctrl, raw_mem, log_addr, adr_type, pre_val, MemNode::unordered); + phase->register_new_node(log_store, ctrl); + // update the index + Node* index_update = new StoreXNode(ctrl, log_store, index_adr, adr_type, next_index, MemNode::unordered); + phase->register_new_node(index_update, ctrl); + + // Fast-path case + region2->init_req(_fast_path, ctrl); + phi2->init_req(_fast_path, index_update); + + ctrl = full; + + Node* base = find_bottom_mem(ctrl, phase); + + MergeMemNode* mm = MergeMemNode::make(base); + mm->set_memory_at(Compile::AliasIdxRaw, raw_mem); + phase->register_new_node(mm, ctrl); + + Node* call = new CallLeafNode(ShenandoahBarrierSetC2::write_ref_field_pre_entry_Type(), CAST_FROM_FN_PTR(address, ShenandoahRuntime::write_ref_field_pre_entry), "shenandoah_wb_pre", TypeRawPtr::BOTTOM); + call->init_req(TypeFunc::Control, ctrl); + call->init_req(TypeFunc::I_O, phase->C->top()); + call->init_req(TypeFunc::Memory, mm); + call->init_req(TypeFunc::FramePtr, phase->C->top()); + call->init_req(TypeFunc::ReturnAdr, phase->C->top()); + call->init_req(TypeFunc::Parms, pre_val); + call->init_req(TypeFunc::Parms+1, thread); + phase->register_control(call, loop, ctrl); + + Node* ctrl_proj = new ProjNode(call, TypeFunc::Control); + phase->register_control(ctrl_proj, loop, call); + Node* mem_proj = new ProjNode(call, TypeFunc::Memory); + phase->register_new_node(mem_proj, call); + + // Slow-path case + region2->init_req(_slow_path, ctrl_proj); + phi2->init_req(_slow_path, mem_proj); + + phase->register_control(region2, loop, reg2_ctrl); + phase->register_new_node(phi2, region2); + + region->init_req(_heap_unstable, region2); + phi->init_req(_heap_unstable, phi2); + + phase->register_control(region, loop, heap_stable_ctrl->in(0)); + phase->register_new_node(phi, region); + + fix_ctrl(barrier, region, fixer, uses, uses_to_ignore, last, phase); + for(uint next = 0; next < uses.size(); next++ ) { + Node *n = uses.at(next); + assert(phase->get_ctrl(n) == init_ctrl, "bad control"); + assert(n != init_raw_mem, "should leave input raw mem above the barrier"); + phase->set_ctrl(n, region); + follow_barrier_uses(n, init_ctrl, uses, phase); + } + fixer.fix_mem(init_ctrl, region, init_raw_mem, raw_mem_for_ctrl, phi, uses); + + phase->igvn().replace_node(barrier, pre_val); + } + + for (int i = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); i > 0; i--) { + int cnt = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); + ShenandoahWriteBarrierNode* wb = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barrier(i-1); + + uint last = phase->C->unique(); + Node* ctrl = phase->get_ctrl(wb); + Node* orig_ctrl = ctrl; + + Node* raw_mem = fixer.find_mem(ctrl, wb); + Node* init_raw_mem = raw_mem; + Node* raw_mem_for_ctrl = fixer.find_mem(ctrl, NULL); + int alias = phase->C->get_alias_index(wb->adr_type()); + Node* wb_mem = wb->in(Memory); + Node* init_wb_mem = wb_mem; + + Node* val = wb->in(ValueIn); + Node* wbproj = wb->find_out_with(Op_ShenandoahWBMemProj); + IdealLoopTree *loop = phase->get_loop(ctrl); + if (loop->_head->is_OuterStripMinedLoop()) { + outer_lsms.push(loop->_head); + } + + assert(val->Opcode() != Op_ShenandoahWriteBarrier, "No chain of write barriers"); + + CallStaticJavaNode* unc = wb->pin_and_expand_null_check(phase->igvn()); + Node* unc_ctrl = NULL; + if (unc != NULL) { + if (val->in(0) != ctrl) { + unc = NULL; + } else { + unc_ctrl = val->in(0); + } + } + + Node* uncasted_val = val; + if (unc != NULL) { + uncasted_val = val->in(1); + } + + Node* heap_stable_ctrl = NULL; + Node* null_ctrl = NULL; + + assert(val->bottom_type()->make_oopptr(), "need oop"); + assert(val->bottom_type()->make_oopptr()->const_oop() == NULL, "expect non-constant"); + + enum { _heap_stable = 1, _heap_unstable, PATH_LIMIT }; + Node* region = new RegionNode(PATH_LIMIT); + Node* val_phi = new PhiNode(region, uncasted_val->bottom_type()->is_oopptr()); + Node* mem_phi = PhiNode::make(region, wb_mem, Type::MEMORY, phase->C->alias_type(wb->adr_type())->adr_type()); + Node* raw_mem_phi = PhiNode::make(region, raw_mem, Type::MEMORY, TypeRawPtr::BOTTOM); + + enum { _not_cset = 1, _not_equal, _evac_path, _null_path, PATH_LIMIT2 }; + Node* region2 = new RegionNode(PATH_LIMIT2); + Node* val_phi2 = new PhiNode(region2, uncasted_val->bottom_type()->is_oopptr()); + Node* mem_phi2 = PhiNode::make(region2, wb_mem, Type::MEMORY, phase->C->alias_type(wb->adr_type())->adr_type()); + Node* raw_mem_phi2 = PhiNode::make(region2, raw_mem, Type::MEMORY, TypeRawPtr::BOTTOM); + + // Stable path. + test_heap_stable(ctrl, raw_mem, heap_stable_ctrl, phase); + IfNode* heap_stable_iff = heap_stable_ctrl->in(0)->as_If(); + + // Heap stable case + region->init_req(_heap_stable, heap_stable_ctrl); + val_phi->init_req(_heap_stable, uncasted_val); + mem_phi->init_req(_heap_stable, wb_mem); + raw_mem_phi->init_req(_heap_stable, raw_mem); + + Node* reg2_ctrl = NULL; + // Null case + test_null(ctrl, val, null_ctrl, phase); + if (null_ctrl != NULL) { + reg2_ctrl = null_ctrl->in(0); + region2->init_req(_null_path, null_ctrl); + val_phi2->init_req(_null_path, uncasted_val); + mem_phi2->init_req(_null_path, wb_mem); + raw_mem_phi2->init_req(_null_path, raw_mem); + } else { + region2->del_req(_null_path); + val_phi2->del_req(_null_path); + mem_phi2->del_req(_null_path); + raw_mem_phi2->del_req(_null_path); + } + + // Test for in-cset. + // Wires !in_cset(obj) to slot 2 of region and phis + Node* not_cset_ctrl = NULL; + in_cset_fast_test(ctrl, not_cset_ctrl, uncasted_val, raw_mem, phase); + if (not_cset_ctrl != NULL) { + if (reg2_ctrl == NULL) reg2_ctrl = not_cset_ctrl->in(0); + region2->init_req(_not_cset, not_cset_ctrl); + val_phi2->init_req(_not_cset, uncasted_val); + mem_phi2->init_req(_not_cset, wb_mem); + raw_mem_phi2->init_req(_not_cset, raw_mem); + } + + // Resolve object when orig-value is in cset. + // Make the unconditional resolve for fwdptr, not the read barrier. + Node* new_val = uncasted_val; + if (unc_ctrl != NULL) { + // Clone the null check in this branch to allow implicit null check + new_val = clone_null_check(ctrl, val, unc_ctrl, phase); + fix_null_check(unc, unc_ctrl, ctrl->in(0)->as_If()->proj_out(0), uses, phase); + + IfNode* iff = unc_ctrl->in(0)->as_If(); + phase->igvn().replace_input_of(iff, 1, phase->igvn().intcon(1)); + } + Node* addr = new AddPNode(new_val, uncasted_val, phase->igvn().MakeConX(ShenandoahBrooksPointer::byte_offset())); + phase->register_new_node(addr, ctrl); + assert(val->bottom_type()->isa_oopptr(), "what else?"); + const TypePtr* obj_type = val->bottom_type()->is_oopptr(); + const TypePtr* adr_type = ShenandoahBarrierNode::brooks_pointer_type(obj_type); + Node* fwd = new LoadPNode(ctrl, wb_mem, addr, adr_type, obj_type, MemNode::unordered); + phase->register_new_node(fwd, ctrl); + + // Only branch to WB stub if object is not forwarded; otherwise reply with fwd ptr + Node* cmp = new CmpPNode(fwd, new_val); + phase->register_new_node(cmp, ctrl); + Node* bol = new BoolNode(cmp, BoolTest::eq); + phase->register_new_node(bol, ctrl); + + IfNode* iff = new IfNode(ctrl, bol, PROB_UNLIKELY(0.999), COUNT_UNKNOWN); + if (reg2_ctrl == NULL) reg2_ctrl = iff; + phase->register_control(iff, loop, ctrl); + Node* if_not_eq = new IfFalseNode(iff); + phase->register_control(if_not_eq, loop, iff); + Node* if_eq = new IfTrueNode(iff); + phase->register_control(if_eq, loop, iff); + + // Wire up not-equal-path in slots 3. + region2->init_req(_not_equal, if_not_eq); + val_phi2->init_req(_not_equal, fwd); + mem_phi2->init_req(_not_equal, wb_mem); + raw_mem_phi2->init_req(_not_equal, raw_mem); + + // Call wb-stub and wire up that path in slots 4 + Node* result_mem = NULL; + ctrl = if_eq; + call_wb_stub(ctrl, new_val, result_mem, + raw_mem, wb_mem, + alias, phase); + region2->init_req(_evac_path, ctrl); + val_phi2->init_req(_evac_path, new_val); + mem_phi2->init_req(_evac_path, result_mem); + raw_mem_phi2->init_req(_evac_path, result_mem); + + phase->register_control(region2, loop, reg2_ctrl); + phase->register_new_node(val_phi2, region2); + phase->register_new_node(mem_phi2, region2); + phase->register_new_node(raw_mem_phi2, region2); + + region->init_req(_heap_unstable, region2); + val_phi->init_req(_heap_unstable, val_phi2); + mem_phi->init_req(_heap_unstable, mem_phi2); + raw_mem_phi->init_req(_heap_unstable, raw_mem_phi2); + + phase->register_control(region, loop, heap_stable_iff); + Node* out_val = val_phi; + phase->register_new_node(val_phi, region); + phase->register_new_node(mem_phi, region); + phase->register_new_node(raw_mem_phi, region); + + fix_ctrl(wb, region, fixer, uses, uses_to_ignore, last, phase); + + ctrl = orig_ctrl; + + phase->igvn().replace_input_of(wbproj, ShenandoahWBMemProjNode::WriteBarrier, phase->C->top()); + phase->igvn().replace_node(wbproj, mem_phi); + if (unc != NULL) { + for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) { + Node* u = val->fast_out(i); + Node* c = phase->ctrl_or_self(u); + if (u != wb && (c != ctrl || is_dominator_same_ctrl(c, wb, u, phase))) { + phase->igvn().rehash_node_delayed(u); + int nb = u->replace_edge(val, out_val); + --i, imax -= nb; + } + } + if (val->outcnt() == 0) { + phase->igvn()._worklist.push(val); + } + } + phase->igvn().replace_node(wb, out_val); + + follow_barrier_uses(mem_phi, ctrl, uses, phase); + follow_barrier_uses(out_val, ctrl, uses, phase); + + for(uint next = 0; next < uses.size(); next++ ) { + Node *n = uses.at(next); + assert(phase->get_ctrl(n) == ctrl, "bad control"); + assert(n != init_raw_mem, "should leave input raw mem above the barrier"); + phase->set_ctrl(n, region); + follow_barrier_uses(n, ctrl, uses, phase); + } + + // The slow path call produces memory: hook the raw memory phi + // from the expanded write barrier with the rest of the graph + // which may require adding memory phis at every post dominated + // region and at enclosing loop heads. Use the memory state + // collected in memory_nodes to fix the memory graph. Update that + // memory state as we go. + fixer.fix_mem(ctrl, region, init_raw_mem, raw_mem_for_ctrl, raw_mem_phi, uses); + assert(ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count() == cnt - 1, "not replaced"); + } + + assert(ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count() == 0, "all write barrier nodes should have been replaced"); + + for (uint i = 0; i < outer_lsms.size(); i++) { + // Expanding a barrier here will break loop strip mining + // verification. Transform the loop so the loop nest doesn't + // appear as strip mined. + OuterStripMinedLoopNode* outer = outer_lsms.at(i)->as_OuterStripMinedLoop(); + hide_strip_mined_loop(outer, outer->unique_ctrl_out()->as_CountedLoop(), phase); + } +} + +void ShenandoahWriteBarrierNode::move_heap_stable_test_out_of_loop(IfNode* iff, PhaseIdealLoop* phase) { + IdealLoopTree *loop = phase->get_loop(iff); + Node* loop_head = loop->_head; + Node* entry_c = loop_head->in(LoopNode::EntryControl); + + Node* bol = iff->in(1); + Node* cmp = bol->in(1); + Node* andi = cmp->in(1); + Node* load = andi->in(1); + + assert(is_gc_state_load(load), "broken"); + if (!phase->is_dominator(load->in(0), entry_c)) { + Node* mem_ctrl = NULL; + Node* mem = dom_mem(load->in(MemNode::Memory), loop_head, Compile::AliasIdxRaw, mem_ctrl, phase); + load = load->clone(); + load->set_req(MemNode::Memory, mem); + load->set_req(0, entry_c); + phase->register_new_node(load, entry_c); + andi = andi->clone(); + andi->set_req(1, load); + phase->register_new_node(andi, entry_c); + cmp = cmp->clone(); + cmp->set_req(1, andi); + phase->register_new_node(cmp, entry_c); + bol = bol->clone(); + bol->set_req(1, cmp); + phase->register_new_node(bol, entry_c); + + Node* old_bol =iff->in(1); + phase->igvn().replace_input_of(iff, 1, bol); + } +} + +bool ShenandoahWriteBarrierNode::identical_backtoback_ifs(Node *n, PhaseIdealLoop* phase) { + if (!n->is_If() || n->is_CountedLoopEnd()) { + return false; + } + Node* region = n->in(0); + + if (!region->is_Region()) { + return false; + } + Node* dom = phase->idom(region); + if (!dom->is_If()) { + return false; + } + + if (!is_heap_stable_test(n) || !is_heap_stable_test(dom)) { + return false; + } + + IfNode* dom_if = dom->as_If(); + Node* proj_true = dom_if->proj_out(1); + Node* proj_false = dom_if->proj_out(0); + + for (uint i = 1; i < region->req(); i++) { + if (phase->is_dominator(proj_true, region->in(i))) { + continue; + } + if (phase->is_dominator(proj_false, region->in(i))) { + continue; + } + return false; + } + + return true; +} + +void ShenandoahWriteBarrierNode::merge_back_to_back_tests(Node* n, PhaseIdealLoop* phase) { + assert(is_heap_stable_test(n), "no other tests"); + if (identical_backtoback_ifs(n, phase)) { + Node* n_ctrl = n->in(0); + if (phase->can_split_if(n_ctrl)) { + IfNode* dom_if = phase->idom(n_ctrl)->as_If(); + if (is_heap_stable_test(n)) { + Node* gc_state_load = n->in(1)->in(1)->in(1)->in(1); + assert(is_gc_state_load(gc_state_load), "broken"); + Node* dom_gc_state_load = dom_if->in(1)->in(1)->in(1)->in(1); + assert(is_gc_state_load(dom_gc_state_load), "broken"); + if (gc_state_load != dom_gc_state_load) { + phase->igvn().replace_node(gc_state_load, dom_gc_state_load); + } + } + PhiNode* bolphi = PhiNode::make_blank(n_ctrl, n->in(1)); + Node* proj_true = dom_if->proj_out(1); + Node* proj_false = dom_if->proj_out(0); + Node* con_true = phase->igvn().makecon(TypeInt::ONE); + Node* con_false = phase->igvn().makecon(TypeInt::ZERO); + + for (uint i = 1; i < n_ctrl->req(); i++) { + if (phase->is_dominator(proj_true, n_ctrl->in(i))) { + bolphi->init_req(i, con_true); + } else { + assert(phase->is_dominator(proj_false, n_ctrl->in(i)), "bad if"); + bolphi->init_req(i, con_false); + } + } + phase->register_new_node(bolphi, n_ctrl); + phase->igvn().replace_input_of(n, 1, bolphi); + phase->do_split_if(n); + } + } +} + +IfNode* ShenandoahWriteBarrierNode::find_unswitching_candidate(const IdealLoopTree *loop, PhaseIdealLoop* phase) { + // Find first invariant test that doesn't exit the loop + LoopNode *head = loop->_head->as_Loop(); + IfNode* unswitch_iff = NULL; + Node* n = head->in(LoopNode::LoopBackControl); + int loop_has_sfpts = -1; + while (n != head) { + Node* n_dom = phase->idom(n); + if (n->is_Region()) { + if (n_dom->is_If()) { + IfNode* iff = n_dom->as_If(); + if (iff->in(1)->is_Bool()) { + BoolNode* bol = iff->in(1)->as_Bool(); + if (bol->in(1)->is_Cmp()) { + // If condition is invariant and not a loop exit, + // then found reason to unswitch. + if (is_heap_stable_test(iff) && + (loop_has_sfpts == -1 || loop_has_sfpts == 0)) { + assert(!loop->is_loop_exit(iff), "both branches should be in the loop"); + if (loop_has_sfpts == -1) { + for(uint i = 0; i < loop->_body.size(); i++) { + Node *m = loop->_body[i]; + if (m->is_SafePoint() && !m->is_CallLeaf()) { + loop_has_sfpts = 1; + break; + } + } + if (loop_has_sfpts == -1) { + loop_has_sfpts = 0; + } + } + if (!loop_has_sfpts) { + unswitch_iff = iff; + } + } + } + } + } + } + n = n_dom; + } + return unswitch_iff; +} + + +void ShenandoahWriteBarrierNode::optimize_after_expansion(VectorSet &visited, Node_Stack &stack, Node_List &old_new, PhaseIdealLoop* phase) { + Node_List heap_stable_tests; + Node_List gc_state_loads; + + stack.push(phase->C->start(), 0); + do { + Node* n = stack.node(); + uint i = stack.index(); + + if (i < n->outcnt()) { + Node* u = n->raw_out(i); + stack.set_index(i+1); + if (!visited.test_set(u->_idx)) { + stack.push(u, 0); + } + } else { + stack.pop(); + if (ShenandoahCommonGCStateLoads && is_gc_state_load(n)) { + gc_state_loads.push(n); + } + if (n->is_If() && is_heap_stable_test(n)) { + heap_stable_tests.push(n); + } + } + } while (stack.size() > 0); + + bool progress; + do { + progress = false; + for (uint i = 0; i < gc_state_loads.size(); i++) { + Node* n = gc_state_loads.at(i); + if (n->outcnt() != 0) { + progress |= try_common_gc_state_load(n, phase); + } + } + } while (progress); + + for (uint i = 0; i < heap_stable_tests.size(); i++) { + Node* n = heap_stable_tests.at(i); + assert(is_heap_stable_test(n), "only evacuation test"); + merge_back_to_back_tests(n, phase); + } + + if (!phase->C->major_progress()) { + VectorSet seen(Thread::current()->resource_area()); + for (uint i = 0; i < heap_stable_tests.size(); i++) { + Node* n = heap_stable_tests.at(i); + IdealLoopTree* loop = phase->get_loop(n); + if (loop != phase->ltree_root() && + loop->_child == NULL && + !loop->_irreducible) { + LoopNode* head = loop->_head->as_Loop(); + if ((!head->is_CountedLoop() || head->as_CountedLoop()->is_main_loop() || head->as_CountedLoop()->is_normal_loop()) && + !seen.test_set(head->_idx)) { + IfNode* iff = find_unswitching_candidate(loop, phase); + if (iff != NULL) { + Node* bol = iff->in(1); + if (head->is_strip_mined()) { + head->verify_strip_mined(0); + } + move_heap_stable_test_out_of_loop(iff, phase); + if (loop->policy_unswitching(phase)) { + if (head->is_strip_mined()) { + OuterStripMinedLoopNode* outer = head->as_CountedLoop()->outer_loop(); + hide_strip_mined_loop(outer, head->as_CountedLoop(), phase); + } + phase->do_unswitching(loop, old_new); + } else { + // Not proceeding with unswitching. Move load back in + // the loop. + phase->igvn().replace_input_of(iff, 1, bol); + } + } + } + } + } + } +} + +#ifdef ASSERT +void ShenandoahBarrierNode::verify_raw_mem(RootNode* root) { + const bool trace = false; + ResourceMark rm; + Unique_Node_List nodes; + Unique_Node_List controls; + Unique_Node_List memories; + + nodes.push(root); + for (uint next = 0; next < nodes.size(); next++) { + Node *n = nodes.at(next); + if (ShenandoahBarrierSetC2::is_shenandoah_wb_call(n)) { + controls.push(n); + if (trace) { tty->print("XXXXXX verifying"); n->dump(); } + for (uint next2 = 0; next2 < controls.size(); next2++) { + Node *m = controls.at(next2); + for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) { + Node* u = m->fast_out(i); + if (u->is_CFG() && !u->is_Root() && + !(u->Opcode() == Op_CProj && u->in(0)->Opcode() == Op_NeverBranch && u->as_Proj()->_con == 1) && + !(u->is_Region() && u->unique_ctrl_out()->Opcode() == Op_Halt)) { + if (trace) { tty->print("XXXXXX pushing control"); u->dump(); } + controls.push(u); + } + } + } + memories.push(n->as_Call()->proj_out(TypeFunc::Memory)); + for (uint next2 = 0; next2 < memories.size(); next2++) { + Node *m = memories.at(next2); + assert(m->bottom_type() == Type::MEMORY, ""); + for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) { + Node* u = m->fast_out(i); + if (u->bottom_type() == Type::MEMORY && (u->is_Mem() || u->is_ClearArray())) { + if (trace) { tty->print("XXXXXX pushing memory"); u->dump(); } + memories.push(u); + } else if (u->is_LoadStore()) { + if (trace) { tty->print("XXXXXX pushing memory"); u->find_out_with(Op_SCMemProj)->dump(); } + memories.push(u->find_out_with(Op_SCMemProj)); + } else if (u->is_MergeMem() && u->as_MergeMem()->memory_at(Compile::AliasIdxRaw) == m) { + if (trace) { tty->print("XXXXXX pushing memory"); u->dump(); } + memories.push(u); + } else if (u->is_Phi()) { + assert(u->bottom_type() == Type::MEMORY, ""); + if (u->adr_type() == TypeRawPtr::BOTTOM || u->adr_type() == TypePtr::BOTTOM) { + assert(controls.member(u->in(0)), ""); + if (trace) { tty->print("XXXXXX pushing memory"); u->dump(); } + memories.push(u); + } + } else if (u->is_SafePoint() || u->is_MemBar()) { + for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) { + Node* uu = u->fast_out(j); + if (uu->bottom_type() == Type::MEMORY) { + if (trace) { tty->print("XXXXXX pushing memory"); uu->dump(); } + memories.push(uu); + } + } + } + } + } + for (uint next2 = 0; next2 < controls.size(); next2++) { + Node *m = controls.at(next2); + if (m->is_Region()) { + bool all_in = true; + for (uint i = 1; i < m->req(); i++) { + if (!controls.member(m->in(i))) { + all_in = false; + break; + } + } + if (trace) { tty->print("XXX verifying %s", all_in ? "all in" : ""); m->dump(); } + bool found_phi = false; + for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax && !found_phi; j++) { + Node* u = m->fast_out(j); + if (u->is_Phi() && memories.member(u)) { + found_phi = true; + for (uint i = 1; i < u->req() && found_phi; i++) { + Node* k = u->in(i); + if (memories.member(k) != controls.member(m->in(i))) { + found_phi = false; + } + } + } + } + assert(found_phi || all_in, ""); + } + } + controls.clear(); + memories.clear(); + } + for( uint i = 0; i < n->len(); ++i ) { + Node *m = n->in(i); + if (m != NULL) { + nodes.push(m); + } + } + } +} +#endif + +const Type* ShenandoahEnqueueBarrierNode::bottom_type() const { + if (in(1) == NULL || in(1)->is_top()) { + return Type::TOP; + } + const Type* t = in(1)->bottom_type(); + if (t == TypePtr::NULL_PTR) { + return t; + } + return t->is_oopptr()->cast_to_nonconst(); +} + +const Type* ShenandoahEnqueueBarrierNode::Value(PhaseGVN* phase) const { + if (in(1) == NULL) { + return Type::TOP; + } + const Type* t = phase->type(in(1)); + if (t == Type::TOP) { + return Type::TOP; + } + if (t == TypePtr::NULL_PTR) { + return t; + } + return t->is_oopptr()->cast_to_nonconst(); +} + +int ShenandoahEnqueueBarrierNode::needed(Node* n) { + if (n == NULL || + n->is_Allocate() || + n->bottom_type() == TypePtr::NULL_PTR || + (n->bottom_type()->make_oopptr() != NULL && n->bottom_type()->make_oopptr()->const_oop() != NULL)) { + return NotNeeded; + } + if (n->is_Phi() || + n->is_CMove()) { + return MaybeNeeded; + } + return Needed; +} + +Node* ShenandoahEnqueueBarrierNode::next(Node* n) { + for (;;) { + if (n == NULL) { + return n; + } else if (n->bottom_type() == TypePtr::NULL_PTR) { + return n; + } else if (n->bottom_type()->make_oopptr() != NULL && n->bottom_type()->make_oopptr()->const_oop() != NULL) { + return n; + } else if (n->is_ConstraintCast() || + n->Opcode() == Op_DecodeN || + n->Opcode() == Op_EncodeP) { + n = n->in(1); + } else if (n->is_Proj()) { + n = n->in(0); + } else { + return n; + } + } + ShouldNotReachHere(); + return NULL; +} + +Node* ShenandoahEnqueueBarrierNode::Identity(PhaseGVN* phase) { + PhaseIterGVN* igvn = phase->is_IterGVN(); + + Node* n = next(in(1)); + + int cont = needed(n); + + if (cont == NotNeeded) { + return in(1); + } else if (cont == MaybeNeeded) { + if (igvn == NULL) { + phase->record_for_igvn(this); + return this; + } else { + ResourceMark rm; + Unique_Node_List wq; + uint wq_i = 0; + + for (;;) { + if (n->is_Phi()) { + for (uint i = 1; i < n->req(); i++) { + Node* m = n->in(i); + if (m != NULL) { + wq.push(m); + } + } + } else { + assert(n->is_CMove(), "nothing else here"); + Node* m = n->in(CMoveNode::IfFalse); + wq.push(m); + m = n->in(CMoveNode::IfTrue); + wq.push(m); + } + Node* orig_n = NULL; + do { + if (wq_i >= wq.size()) { + return in(1); + } + n = wq.at(wq_i); + wq_i++; + orig_n = n; + n = next(n); + cont = needed(n); + if (cont == Needed) { + return this; + } + } while (cont != MaybeNeeded || (orig_n != n && wq.member(n))); + } + } + } + + return this; +} + +#ifdef ASSERT +static bool has_never_branch(Node* root) { + for (uint i = 1; i < root->req(); i++) { + Node* in = root->in(i); + if (in != NULL && in->Opcode() == Op_Halt && in->in(0)->is_Proj() && in->in(0)->in(0)->Opcode() == Op_NeverBranch) { + return true; + } + } + return false; +} +#endif + +void MemoryGraphFixer::collect_memory_nodes() { + Node_Stack stack(0); + VectorSet visited(Thread::current()->resource_area()); + Node_List regions; + + // Walk the raw memory graph and create a mapping from CFG node to + // memory node. Exclude phis for now. + stack.push(_phase->C->root(), 1); + do { + Node* n = stack.node(); + int opc = n->Opcode(); + uint i = stack.index(); + if (i < n->req()) { + Node* mem = NULL; + if (opc == Op_Root) { + Node* in = n->in(i); + int in_opc = in->Opcode(); + if (in_opc == Op_Return || in_opc == Op_Rethrow) { + mem = in->in(TypeFunc::Memory); + } else if (in_opc == Op_Halt) { + if (!in->in(0)->is_Region()) { + Node* proj = in->in(0); + assert(proj->is_Proj(), ""); + Node* in = proj->in(0); + assert(in->is_CallStaticJava() || in->Opcode() == Op_NeverBranch || in->Opcode() == Op_Catch || proj->is_IfProj(), ""); + if (in->is_CallStaticJava()) { + mem = in->in(TypeFunc::Memory); + } else if (in->Opcode() == Op_Catch) { + Node* call = in->in(0)->in(0); + assert(call->is_Call(), ""); + mem = call->in(TypeFunc::Memory); + } + } + } else { +#ifdef ASSERT + n->dump(); + in->dump(); +#endif + ShouldNotReachHere(); + } + } else { + assert(n->is_Phi() && n->bottom_type() == Type::MEMORY, ""); + assert(n->adr_type() == TypePtr::BOTTOM || _phase->C->get_alias_index(n->adr_type()) == _alias, ""); + mem = n->in(i); + } + i++; + stack.set_index(i); + if (mem == NULL) { + continue; + } + for (;;) { + if (visited.test_set(mem->_idx) || mem->is_Start()) { + break; + } + if (mem->is_Phi()) { + stack.push(mem, 2); + mem = mem->in(1); + } else if (mem->is_Proj()) { + stack.push(mem, mem->req()); + mem = mem->in(0); + } else if (mem->is_SafePoint() || mem->is_MemBar()) { + mem = mem->in(TypeFunc::Memory); + } else if (mem->is_MergeMem()) { + MergeMemNode* mm = mem->as_MergeMem(); + mem = mm->memory_at(_alias); + } else if (mem->is_Store() || mem->is_LoadStore() || mem->is_ClearArray()) { + assert(_alias == Compile::AliasIdxRaw, ""); + stack.push(mem, mem->req()); + mem = mem->in(MemNode::Memory); + } else if (mem->Opcode() == Op_ShenandoahWriteBarrier) { + assert(_alias != Compile::AliasIdxRaw, ""); + mem = mem->in(ShenandoahBarrierNode::Memory); + } else if (mem->Opcode() == Op_ShenandoahWBMemProj) { + stack.push(mem, mem->req()); + mem = mem->in(ShenandoahWBMemProjNode::WriteBarrier); + } else { +#ifdef ASSERT + mem->dump(); +#endif + ShouldNotReachHere(); + } + } + } else { + if (n->is_Phi()) { + // Nothing + } else if (!n->is_Root()) { + Node* c = get_ctrl(n); + _memory_nodes.map(c->_idx, n); + } + stack.pop(); + } + } while(stack.is_nonempty()); + + // Iterate over CFG nodes in rpo and propagate memory state to + // compute memory state at regions, creating new phis if needed. + Node_List rpo_list; + visited.Clear(); + _phase->rpo(_phase->C->root(), stack, visited, rpo_list); + Node* root = rpo_list.pop(); + assert(root == _phase->C->root(), ""); + + const bool trace = false; +#ifdef ASSERT + if (trace) { + for (int i = rpo_list.size() - 1; i >= 0; i--) { + Node* c = rpo_list.at(i); + if (_memory_nodes[c->_idx] != NULL) { + tty->print("X %d", c->_idx); _memory_nodes[c->_idx]->dump(); + } + } + } +#endif + uint last = _phase->C->unique(); + +#ifdef ASSERT + uint8_t max_depth = 0; + for (LoopTreeIterator iter(_phase->ltree_root()); !iter.done(); iter.next()) { + IdealLoopTree* lpt = iter.current(); + max_depth = MAX2(max_depth, lpt->_nest); + } +#endif + + bool progress = true; + int iteration = 0; + Node_List dead_phis; + while (progress) { + progress = false; + iteration++; + assert(iteration <= 2+max_depth || _phase->C->has_irreducible_loop(), ""); + if (trace) { tty->print_cr("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"); } + IdealLoopTree* last_updated_ilt = NULL; + for (int i = rpo_list.size() - 1; i >= 0; i--) { + Node* c = rpo_list.at(i); + + Node* prev_mem = _memory_nodes[c->_idx]; + if (c->is_Region() && (_include_lsm || !c->is_OuterStripMinedLoop())) { + Node* prev_region = regions[c->_idx]; + Node* unique = NULL; + for (uint j = 1; j < c->req() && unique != NodeSentinel; j++) { + Node* m = _memory_nodes[c->in(j)->_idx]; + assert(m != NULL || (c->is_Loop() && j == LoopNode::LoopBackControl && iteration == 1) || _phase->C->has_irreducible_loop() || has_never_branch(_phase->C->root()), "expect memory state"); + if (m != NULL) { + if (m == prev_region && ((c->is_Loop() && j == LoopNode::LoopBackControl) || (prev_region->is_Phi() && prev_region->in(0) == c))) { + assert(c->is_Loop() && j == LoopNode::LoopBackControl || _phase->C->has_irreducible_loop(), ""); + // continue + } else if (unique == NULL) { + unique = m; + } else if (m == unique) { + // continue + } else { + unique = NodeSentinel; + } + } + } + assert(unique != NULL, "empty phi???"); + if (unique != NodeSentinel) { + if (prev_region != NULL && prev_region->is_Phi() && prev_region->in(0) == c) { + dead_phis.push(prev_region); + } + regions.map(c->_idx, unique); + } else { + Node* phi = NULL; + if (prev_region != NULL && prev_region->is_Phi() && prev_region->in(0) == c && prev_region->_idx >= last) { + phi = prev_region; + for (uint k = 1; k < c->req(); k++) { + Node* m = _memory_nodes[c->in(k)->_idx]; + assert(m != NULL, "expect memory state"); + phi->set_req(k, m); + } + } else { + for (DUIterator_Fast jmax, j = c->fast_outs(jmax); j < jmax && phi == NULL; j++) { + Node* u = c->fast_out(j); + if (u->is_Phi() && u->bottom_type() == Type::MEMORY && + (u->adr_type() == TypePtr::BOTTOM || _phase->C->get_alias_index(u->adr_type()) == _alias)) { + phi = u; + for (uint k = 1; k < c->req() && phi != NULL; k++) { + Node* m = _memory_nodes[c->in(k)->_idx]; + assert(m != NULL, "expect memory state"); + if (u->in(k) != m) { + phi = NULL; + } + } + } + } + if (phi == NULL) { + phi = new PhiNode(c, Type::MEMORY, _phase->C->get_adr_type(_alias)); + for (uint k = 1; k < c->req(); k++) { + Node* m = _memory_nodes[c->in(k)->_idx]; + assert(m != NULL, "expect memory state"); + phi->init_req(k, m); + } + } + } + assert(phi != NULL, ""); + regions.map(c->_idx, phi); + } + Node* current_region = regions[c->_idx]; + if (current_region != prev_region) { + progress = true; + if (prev_region == prev_mem) { + _memory_nodes.map(c->_idx, current_region); + } + } + } else if (prev_mem == NULL || prev_mem->is_Phi() || ctrl_or_self(prev_mem) != c) { + Node* m = _memory_nodes[_phase->idom(c)->_idx]; + assert(m != NULL, "expect memory state"); + if (m != prev_mem) { + _memory_nodes.map(c->_idx, m); + progress = true; + } + } +#ifdef ASSERT + if (trace) { tty->print("X %d", c->_idx); _memory_nodes[c->_idx]->dump(); } +#endif + } + } + + // Replace existing phi with computed memory state for that region + // if different (could be a new phi or a dominating memory node if + // that phi was found to be useless). + while (dead_phis.size() > 0) { + Node* n = dead_phis.pop(); + n->replace_by(_phase->C->top()); + n->destruct(); + } + for (int i = rpo_list.size() - 1; i >= 0; i--) { + Node* c = rpo_list.at(i); + if (c->is_Region() && (_include_lsm || !c->is_OuterStripMinedLoop())) { + Node* n = regions[c->_idx]; + if (n->is_Phi() && n->_idx >= last && n->in(0) == c) { + _phase->register_new_node(n, c); + } + } + } + for (int i = rpo_list.size() - 1; i >= 0; i--) { + Node* c = rpo_list.at(i); + if (c->is_Region() && (_include_lsm || !c->is_OuterStripMinedLoop())) { + Node* n = regions[c->_idx]; + for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax; i++) { + Node* u = c->fast_out(i); + if (u->is_Phi() && u->bottom_type() == Type::MEMORY && + u != n) { + if (u->adr_type() == TypePtr::BOTTOM) { + fix_memory_uses(u, n, n, c); + } else if (_phase->C->get_alias_index(u->adr_type()) == _alias) { + _phase->lazy_replace(u, n); + --i; --imax; + } + } + } + } + } +} + +Node* MemoryGraphFixer::get_ctrl(Node* n) const { + Node* c = _phase->get_ctrl(n); + if (n->is_Proj() && n->in(0) != NULL && n->in(0)->is_Call()) { + assert(c == n->in(0), ""); + CallNode* call = c->as_Call(); + CallProjections projs; + call->extract_projections(&projs, true, false); + if (projs.catchall_memproj != NULL) { + if (projs.fallthrough_memproj == n) { + c = projs.fallthrough_catchproj; + } else { + assert(projs.catchall_memproj == n, ""); + c = projs.catchall_catchproj; + } + } + } + return c; +} + +Node* MemoryGraphFixer::ctrl_or_self(Node* n) const { + if (_phase->has_ctrl(n)) + return get_ctrl(n); + else { + assert (n->is_CFG(), "must be a CFG node"); + return n; + } +} + +bool MemoryGraphFixer::mem_is_valid(Node* m, Node* c) const { + return m != NULL && get_ctrl(m) == c; +} + +Node* MemoryGraphFixer::find_mem(Node* ctrl, Node* n) const { + assert(n == NULL || _phase->ctrl_or_self(n) == ctrl, ""); + Node* mem = _memory_nodes[ctrl->_idx]; + Node* c = ctrl; + while (!mem_is_valid(mem, c) && + (!c->is_CatchProj() || mem == NULL || c->in(0)->in(0)->in(0) != get_ctrl(mem))) { + c = _phase->idom(c); + mem = _memory_nodes[c->_idx]; + } + if (n != NULL && mem_is_valid(mem, c)) { + while (!ShenandoahWriteBarrierNode::is_dominator_same_ctrl(c, mem, n, _phase) && _phase->ctrl_or_self(mem) == ctrl) { + mem = next_mem(mem, _alias); + } + if (mem->is_MergeMem()) { + mem = mem->as_MergeMem()->memory_at(_alias); + } + if (!mem_is_valid(mem, c)) { + do { + c = _phase->idom(c); + mem = _memory_nodes[c->_idx]; + } while (!mem_is_valid(mem, c) && + (!c->is_CatchProj() || mem == NULL || c->in(0)->in(0)->in(0) != get_ctrl(mem))); + } + } + assert(mem->bottom_type() == Type::MEMORY, ""); + return mem; +} + +bool MemoryGraphFixer::has_mem_phi(Node* region) const { + for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { + Node* use = region->fast_out(i); + if (use->is_Phi() && use->bottom_type() == Type::MEMORY && + (_phase->C->get_alias_index(use->adr_type()) == _alias)) { + return true; + } + } + return false; +} + +void MemoryGraphFixer::fix_mem(Node* ctrl, Node* new_ctrl, Node* mem, Node* mem_for_ctrl, Node* new_mem, Unique_Node_List& uses) { + assert(_phase->ctrl_or_self(new_mem) == new_ctrl, ""); + const bool trace = false; + DEBUG_ONLY(if (trace) { tty->print("ZZZ control is"); ctrl->dump(); }); + DEBUG_ONLY(if (trace) { tty->print("ZZZ mem is"); mem->dump(); }); + GrowableArray phis; + if (mem_for_ctrl != mem) { + Node* old = mem_for_ctrl; + Node* prev = NULL; + while (old != mem) { + prev = old; + if (old->is_Store() || old->is_ClearArray() || old->is_LoadStore()) { + assert(_alias == Compile::AliasIdxRaw, ""); + old = old->in(MemNode::Memory); + } else if (old->Opcode() == Op_SCMemProj) { + assert(_alias == Compile::AliasIdxRaw, ""); + old = old->in(0); + } else if (old->Opcode() == Op_ShenandoahWBMemProj) { + assert(_alias != Compile::AliasIdxRaw, ""); + old = old->in(ShenandoahWBMemProjNode::WriteBarrier); + } else if (old->Opcode() == Op_ShenandoahWriteBarrier) { + assert(_alias != Compile::AliasIdxRaw, ""); + old = old->in(ShenandoahBarrierNode::Memory); + } else { + ShouldNotReachHere(); + } + } + assert(prev != NULL, ""); + if (new_ctrl != ctrl) { + _memory_nodes.map(ctrl->_idx, mem); + _memory_nodes.map(new_ctrl->_idx, mem_for_ctrl); + } + uint input = prev->Opcode() == Op_ShenandoahWriteBarrier ? (uint)ShenandoahBarrierNode::Memory : (uint)MemNode::Memory; + _phase->igvn().replace_input_of(prev, input, new_mem); + } else { + uses.clear(); + _memory_nodes.map(new_ctrl->_idx, new_mem); + uses.push(new_ctrl); + for(uint next = 0; next < uses.size(); next++ ) { + Node *n = uses.at(next); + assert(n->is_CFG(), ""); + DEBUG_ONLY(if (trace) { tty->print("ZZZ ctrl"); n->dump(); }); + for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { + Node* u = n->fast_out(i); + if (!u->is_Root() && u->is_CFG() && u != n) { + Node* m = _memory_nodes[u->_idx]; + if (u->is_Region() && (!u->is_OuterStripMinedLoop() || _include_lsm) && + !has_mem_phi(u) && + u->unique_ctrl_out()->Opcode() != Op_Halt) { + DEBUG_ONLY(if (trace) { tty->print("ZZZ region"); u->dump(); }); + DEBUG_ONLY(if (trace && m != NULL) { tty->print("ZZZ mem"); m->dump(); }); + + if (!mem_is_valid(m, u) || !m->is_Phi()) { + bool push = true; + bool create_phi = true; + if (_phase->is_dominator(new_ctrl, u)) { + create_phi = false; + } else if (!_phase->C->has_irreducible_loop()) { + IdealLoopTree* loop = _phase->get_loop(ctrl); + bool do_check = true; + IdealLoopTree* l = loop; + create_phi = false; + while (l != _phase->ltree_root()) { + if (_phase->is_dominator(l->_head, u) && _phase->is_dominator(_phase->idom(u), l->_head)) { + create_phi = true; + do_check = false; + break; + } + l = l->_parent; + } + + if (do_check) { + assert(!create_phi, ""); + IdealLoopTree* u_loop = _phase->get_loop(u); + if (u_loop != _phase->ltree_root() && u_loop->is_member(loop)) { + Node* c = ctrl; + while (!_phase->is_dominator(c, u_loop->tail())) { + c = _phase->idom(c); + } + if (!_phase->is_dominator(c, u)) { + do_check = false; + } + } + } + + if (do_check && _phase->is_dominator(_phase->idom(u), new_ctrl)) { + create_phi = true; + } + } + if (create_phi) { + Node* phi = new PhiNode(u, Type::MEMORY, _phase->C->get_adr_type(_alias)); + _phase->register_new_node(phi, u); + phis.push(phi); + DEBUG_ONLY(if (trace) { tty->print("ZZZ new phi"); phi->dump(); }); + if (!mem_is_valid(m, u)) { + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting mem"); phi->dump(); }); + _memory_nodes.map(u->_idx, phi); + } else { + DEBUG_ONLY(if (trace) { tty->print("ZZZ NOT setting mem"); m->dump(); }); + for (;;) { + assert(m->is_Mem() || m->is_LoadStore() || m->is_Proj() || m->Opcode() == Op_ShenandoahWriteBarrier || m->Opcode() == Op_ShenandoahWBMemProj, ""); + Node* next = NULL; + if (m->is_Proj()) { + next = m->in(0); + } else if (m->Opcode() == Op_ShenandoahWBMemProj) { + next = m->in(ShenandoahWBMemProjNode::WriteBarrier); + } else if (m->is_Mem() || m->is_LoadStore()) { + assert(_alias == Compile::AliasIdxRaw, ""); + next = m->in(MemNode::Memory); + } else { + assert(_alias != Compile::AliasIdxRaw, ""); + assert (m->Opcode() == Op_ShenandoahWriteBarrier, ""); + next = m->in(ShenandoahBarrierNode::Memory); + } + if (_phase->get_ctrl(next) != u) { + break; + } + if (next->is_MergeMem()) { + assert(_phase->get_ctrl(next->as_MergeMem()->memory_at(_alias)) != u, ""); + break; + } + if (next->is_Phi()) { + assert(next->adr_type() == TypePtr::BOTTOM && next->in(0) == u, ""); + break; + } + m = next; + } + + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting to phi"); m->dump(); }); + assert(m->is_Mem() || m->is_LoadStore() || m->Opcode() == Op_ShenandoahWriteBarrier, ""); + uint input = (m->is_Mem() || m->is_LoadStore()) ? (uint)MemNode::Memory : (uint)ShenandoahBarrierNode::Memory; + _phase->igvn().replace_input_of(m, input, phi); + push = false; + } + } else { + DEBUG_ONLY(if (trace) { tty->print("ZZZ skipping region"); u->dump(); }); + } + if (push) { + uses.push(u); + } + } + } else if (!mem_is_valid(m, u) && + !(u->Opcode() == Op_CProj && u->in(0)->Opcode() == Op_NeverBranch && u->as_Proj()->_con == 1)) { + uses.push(u); + } + } + } + } + for (int i = 0; i < phis.length(); i++) { + Node* n = phis.at(i); + Node* r = n->in(0); + DEBUG_ONLY(if (trace) { tty->print("ZZZ fixing new phi"); n->dump(); }); + for (uint j = 1; j < n->req(); j++) { + Node* m = find_mem(r->in(j), NULL); + _phase->igvn().replace_input_of(n, j, m); + DEBUG_ONLY(if (trace) { tty->print("ZZZ fixing new phi: %d", j); m->dump(); }); + } + } + } + uint last = _phase->C->unique(); + MergeMemNode* mm = NULL; + int alias = _alias; + DEBUG_ONLY(if (trace) { tty->print("ZZZ raw mem is"); mem->dump(); }); + for (DUIterator i = mem->outs(); mem->has_out(i); i++) { + Node* u = mem->out(i); + if (u->_idx < last) { + if (u->is_Mem()) { + if (_phase->C->get_alias_index(u->adr_type()) == alias) { + Node* m = find_mem(_phase->get_ctrl(u), u); + if (m != mem) { + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); u->dump(); }); + _phase->igvn().replace_input_of(u, MemNode::Memory, m); + --i; + } + } + } else if (u->is_MergeMem()) { + MergeMemNode* u_mm = u->as_MergeMem(); + if (u_mm->memory_at(alias) == mem) { + MergeMemNode* newmm = NULL; + for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) { + Node* uu = u->fast_out(j); + assert(!uu->is_MergeMem(), "chain of MergeMems?"); + if (uu->is_Phi()) { + assert(uu->adr_type() == TypePtr::BOTTOM, ""); + Node* region = uu->in(0); + int nb = 0; + for (uint k = 1; k < uu->req(); k++) { + if (uu->in(k) == u) { + Node* m = find_mem(region->in(k), NULL); + if (m != mem) { + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of phi %d", k); uu->dump(); }); + newmm = clone_merge_mem(u, mem, m, _phase->ctrl_or_self(m), i); + if (newmm != u) { + _phase->igvn().replace_input_of(uu, k, newmm); + nb++; + --jmax; + } + } + } + } + if (nb > 0) { + --j; + } + } else { + Node* m = find_mem(_phase->ctrl_or_self(uu), uu); + if (m != mem) { + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); uu->dump(); }); + newmm = clone_merge_mem(u, mem, m, _phase->ctrl_or_self(m), i); + if (newmm != u) { + _phase->igvn().replace_input_of(uu, uu->find_edge(u), newmm); + --j, --jmax; + } + } + } + } + } + } else if (u->is_Phi()) { + assert(u->bottom_type() == Type::MEMORY, "what else?"); + if (_phase->C->get_alias_index(u->adr_type()) == alias || u->adr_type() == TypePtr::BOTTOM) { + Node* region = u->in(0); + bool replaced = false; + for (uint j = 1; j < u->req(); j++) { + if (u->in(j) == mem) { + Node* m = find_mem(region->in(j), NULL); + Node* nnew = m; + if (m != mem) { + if (u->adr_type() == TypePtr::BOTTOM) { + mm = allocate_merge_mem(mem, m, _phase->ctrl_or_self(m)); + nnew = mm; + } + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of phi %d", j); u->dump(); }); + _phase->igvn().replace_input_of(u, j, nnew); + replaced = true; + } + } + } + if (replaced) { + --i; + } + } + } else if ((u->adr_type() == TypePtr::BOTTOM && u->Opcode() != Op_StrInflatedCopy) || + u->adr_type() == NULL) { + assert(u->adr_type() != NULL || + u->Opcode() == Op_Rethrow || + u->Opcode() == Op_Return || + u->Opcode() == Op_SafePoint || + (u->is_CallStaticJava() && u->as_CallStaticJava()->uncommon_trap_request() != 0) || + (u->is_CallStaticJava() && u->as_CallStaticJava()->_entry_point == OptoRuntime::rethrow_stub()) || + u->Opcode() == Op_CallLeaf, ""); + Node* m = find_mem(_phase->ctrl_or_self(u), u); + if (m != mem) { + mm = allocate_merge_mem(mem, m, _phase->get_ctrl(m)); + _phase->igvn().replace_input_of(u, u->find_edge(mem), mm); + --i; + } + } else if (_phase->C->get_alias_index(u->adr_type()) == alias) { + Node* m = find_mem(_phase->ctrl_or_self(u), u); + if (m != mem) { + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); u->dump(); }); + _phase->igvn().replace_input_of(u, u->find_edge(mem), m); + --i; + } + } else if (u->adr_type() != TypePtr::BOTTOM && + _memory_nodes[_phase->ctrl_or_self(u)->_idx] == u) { + Node* m = find_mem(_phase->ctrl_or_self(u), u); + assert(m != mem, ""); + // u is on the wrong slice... + assert(u->is_ClearArray(), ""); + DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); u->dump(); }); + _phase->igvn().replace_input_of(u, u->find_edge(mem), m); + --i; + } + } + } +#ifdef ASSERT + assert(new_mem->outcnt() > 0, ""); + for (int i = 0; i < phis.length(); i++) { + Node* n = phis.at(i); + assert(n->outcnt() > 0, "new phi must have uses now"); + } +#endif +} + +MergeMemNode* MemoryGraphFixer::allocate_merge_mem(Node* mem, Node* rep_proj, Node* rep_ctrl) const { + MergeMemNode* mm = MergeMemNode::make(mem); + mm->set_memory_at(_alias, rep_proj); + _phase->register_new_node(mm, rep_ctrl); + return mm; +} + +MergeMemNode* MemoryGraphFixer::clone_merge_mem(Node* u, Node* mem, Node* rep_proj, Node* rep_ctrl, DUIterator& i) const { + MergeMemNode* newmm = NULL; + MergeMemNode* u_mm = u->as_MergeMem(); + Node* c = _phase->get_ctrl(u); + if (_phase->is_dominator(c, rep_ctrl)) { + c = rep_ctrl; + } else { + assert(_phase->is_dominator(rep_ctrl, c), "one must dominate the other"); + } + if (u->outcnt() == 1) { + if (u->req() > (uint)_alias && u->in(_alias) == mem) { + _phase->igvn().replace_input_of(u, _alias, rep_proj); + --i; + } else { + _phase->igvn().rehash_node_delayed(u); + u_mm->set_memory_at(_alias, rep_proj); + } + newmm = u_mm; + _phase->set_ctrl_and_loop(u, c); + } else { + // can't simply clone u and then change one of its input because + // it adds and then removes an edge which messes with the + // DUIterator + newmm = MergeMemNode::make(u_mm->base_memory()); + for (uint j = 0; j < u->req(); j++) { + if (j < newmm->req()) { + if (j == (uint)_alias) { + newmm->set_req(j, rep_proj); + } else if (newmm->in(j) != u->in(j)) { + newmm->set_req(j, u->in(j)); + } + } else if (j == (uint)_alias) { + newmm->add_req(rep_proj); + } else { + newmm->add_req(u->in(j)); + } + } + if ((uint)_alias >= u->req()) { + newmm->set_memory_at(_alias, rep_proj); + } + _phase->register_new_node(newmm, c); + } + return newmm; +} + +bool MemoryGraphFixer::should_process_phi(Node* phi) const { + if (phi->adr_type() == TypePtr::BOTTOM) { + Node* region = phi->in(0); + for (DUIterator_Fast jmax, j = region->fast_outs(jmax); j < jmax; j++) { + Node* uu = region->fast_out(j); + if (uu->is_Phi() && uu != phi && uu->bottom_type() == Type::MEMORY && _phase->C->get_alias_index(uu->adr_type()) == _alias) { + return false; + } + } + return true; + } + return _phase->C->get_alias_index(phi->adr_type()) == _alias; +} + +void MemoryGraphFixer::fix_memory_uses(Node* mem, Node* replacement, Node* rep_proj, Node* rep_ctrl) const { + uint last = _phase-> C->unique(); + MergeMemNode* mm = NULL; + assert(mem->bottom_type() == Type::MEMORY, ""); + for (DUIterator i = mem->outs(); mem->has_out(i); i++) { + Node* u = mem->out(i); + if (u != replacement && u->_idx < last) { + if (u->is_ShenandoahBarrier() && _alias != Compile::AliasIdxRaw) { + if (_phase->C->get_alias_index(u->adr_type()) == _alias && ShenandoahWriteBarrierNode::is_dominator(rep_ctrl, _phase->ctrl_or_self(u), replacement, u, _phase)) { + _phase->igvn().replace_input_of(u, u->find_edge(mem), rep_proj); + assert(u->find_edge(mem) == -1, "only one edge"); + --i; + } + } else if (u->is_Mem()) { + if (_phase->C->get_alias_index(u->adr_type()) == _alias && ShenandoahWriteBarrierNode::is_dominator(rep_ctrl, _phase->ctrl_or_self(u), replacement, u, _phase)) { + assert(_alias == Compile::AliasIdxRaw , "only raw memory can lead to a memory operation"); + _phase->igvn().replace_input_of(u, u->find_edge(mem), rep_proj); + assert(u->find_edge(mem) == -1, "only one edge"); + --i; + } + } else if (u->is_MergeMem()) { + MergeMemNode* u_mm = u->as_MergeMem(); + if (u_mm->memory_at(_alias) == mem) { + MergeMemNode* newmm = NULL; + for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) { + Node* uu = u->fast_out(j); + assert(!uu->is_MergeMem(), "chain of MergeMems?"); + if (uu->is_Phi()) { + if (should_process_phi(uu)) { + Node* region = uu->in(0); + int nb = 0; + for (uint k = 1; k < uu->req(); k++) { + if (uu->in(k) == u && _phase->is_dominator(rep_ctrl, region->in(k))) { + if (newmm == NULL) { + newmm = clone_merge_mem(u, mem, rep_proj, rep_ctrl, i); + } + if (newmm != u) { + _phase->igvn().replace_input_of(uu, k, newmm); + nb++; + --jmax; + } + } + } + if (nb > 0) { + --j; + } + } + } else { + if (rep_ctrl != uu && ShenandoahWriteBarrierNode::is_dominator(rep_ctrl, _phase->ctrl_or_self(uu), replacement, uu, _phase)) { + if (newmm == NULL) { + newmm = clone_merge_mem(u, mem, rep_proj, rep_ctrl, i); + } + if (newmm != u) { + _phase->igvn().replace_input_of(uu, uu->find_edge(u), newmm); + --j, --jmax; + } + } + } + } + } + } else if (u->is_Phi()) { + assert(u->bottom_type() == Type::MEMORY, "what else?"); + Node* region = u->in(0); + if (should_process_phi(u)) { + bool replaced = false; + for (uint j = 1; j < u->req(); j++) { + if (u->in(j) == mem && _phase->is_dominator(rep_ctrl, region->in(j))) { + Node* nnew = rep_proj; + if (u->adr_type() == TypePtr::BOTTOM) { + if (mm == NULL) { + mm = allocate_merge_mem(mem, rep_proj, rep_ctrl); + } + nnew = mm; + } + _phase->igvn().replace_input_of(u, j, nnew); + replaced = true; + } + } + if (replaced) { + --i; + } + + } + } else if ((u->adr_type() == TypePtr::BOTTOM && u->Opcode() != Op_StrInflatedCopy) || + u->adr_type() == NULL) { + assert(u->adr_type() != NULL || + u->Opcode() == Op_Rethrow || + u->Opcode() == Op_Return || + u->Opcode() == Op_SafePoint || + (u->is_CallStaticJava() && u->as_CallStaticJava()->uncommon_trap_request() != 0) || + (u->is_CallStaticJava() && u->as_CallStaticJava()->_entry_point == OptoRuntime::rethrow_stub()) || + u->Opcode() == Op_CallLeaf, ""); + if (ShenandoahWriteBarrierNode::is_dominator(rep_ctrl, _phase->ctrl_or_self(u), replacement, u, _phase)) { + if (mm == NULL) { + mm = allocate_merge_mem(mem, rep_proj, rep_ctrl); + } + _phase->igvn().replace_input_of(u, u->find_edge(mem), mm); + --i; + } + } else if (_phase->C->get_alias_index(u->adr_type()) == _alias) { + if (ShenandoahWriteBarrierNode::is_dominator(rep_ctrl, _phase->ctrl_or_self(u), replacement, u, _phase)) { + _phase->igvn().replace_input_of(u, u->find_edge(mem), rep_proj); + --i; + } + } + } + } +} + +void MemoryGraphFixer::remove(Node* n) { + assert(n->Opcode() == Op_ShenandoahWBMemProj, ""); + Node* c = _phase->get_ctrl(n); + Node* mem = find_mem(c, NULL); + if (mem == n) { + _memory_nodes.map(c->_idx, mem->in(ShenandoahWBMemProjNode::WriteBarrier)->in(ShenandoahBarrierNode::Memory)); + } +} + +