hotspot/src/share/vm/opto/macro.cpp
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rev 611 : Merge
@@ -1,10 +1,10 @@
#ifdef USE_PRAGMA_IDENT_SRC
#pragma ident "@(#)macro.cpp 1.33 07/10/04 14:36:00 JVM"
#endif
/*
- * Copyright 2005-2007 Sun Microsystems, Inc. All Rights Reserved.
+ * Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -55,33 +55,63 @@
// Copy debug information and adjust JVMState information
uint old_dbg_start = oldcall->tf()->domain()->cnt();
uint new_dbg_start = newcall->tf()->domain()->cnt();
int jvms_adj = new_dbg_start - old_dbg_start;
assert (new_dbg_start == newcall->req(), "argument count mismatch");
+
+ Dict* sosn_map = new Dict(cmpkey,hashkey);
for (uint i = old_dbg_start; i < oldcall->req(); i++) {
- newcall->add_req(oldcall->in(i));
+ Node* old_in = oldcall->in(i);
+ // Clone old SafePointScalarObjectNodes, adjusting their field contents.
+ if (old_in != NULL && old_in->is_SafePointScalarObject()) {
+ SafePointScalarObjectNode* old_sosn = old_in->as_SafePointScalarObject();
+ uint old_unique = C->unique();
+ Node* new_in = old_sosn->clone(jvms_adj, sosn_map);
+ if (old_unique != C->unique()) {
+ new_in = transform_later(new_in); // Register new node.
+ }
+ old_in = new_in;
+ }
+ newcall->add_req(old_in);
}
+
newcall->set_jvms(oldcall->jvms());
for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) {
jvms->set_map(newcall);
jvms->set_locoff(jvms->locoff()+jvms_adj);
jvms->set_stkoff(jvms->stkoff()+jvms_adj);
jvms->set_monoff(jvms->monoff()+jvms_adj);
+ jvms->set_scloff(jvms->scloff()+jvms_adj);
jvms->set_endoff(jvms->endoff()+jvms_adj);
}
}
-Node* PhaseMacroExpand::opt_iff(Node* region, Node* iff) {
- IfNode *opt_iff = transform_later(iff)->as_If();
+Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) {
+ Node* cmp;
+ if (mask != 0) {
+ Node* and_node = transform_later(new (C, 3) AndXNode(word, MakeConX(mask)));
+ cmp = transform_later(new (C, 3) CmpXNode(and_node, MakeConX(bits)));
+ } else {
+ cmp = word;
+ }
+ Node* bol = transform_later(new (C, 2) BoolNode(cmp, BoolTest::ne));
+ IfNode* iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
+ transform_later(iff);
- // Fast path taken; set region slot 2
- Node *fast_taken = transform_later( new (C, 1) IfFalseNode(opt_iff) );
- region->init_req(2,fast_taken); // Capture fast-control
+ // Fast path taken.
+ Node *fast_taken = transform_later( new (C, 1) IfFalseNode(iff) );
// Fast path not-taken, i.e. slow path
- Node *slow_taken = transform_later( new (C, 1) IfTrueNode(opt_iff) );
+ Node *slow_taken = transform_later( new (C, 1) IfTrueNode(iff) );
+
+ if (return_fast_path) {
+ region->init_req(edge, slow_taken); // Capture slow-control
+ return fast_taken;
+ } else {
+ region->init_req(edge, fast_taken); // Capture fast-control
return slow_taken;
+ }
}
//--------------------copy_predefined_input_for_runtime_call--------------------
void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) {
// Set fixed predefined input arguments
@@ -167,10 +197,662 @@
}
}
}
+// Eliminate a card mark sequence. p2x is a ConvP2XNode
+void PhaseMacroExpand::eliminate_card_mark(Node *p2x) {
+ assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required");
+ Node *shift = p2x->unique_out();
+ Node *addp = shift->unique_out();
+ for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) {
+ Node *st = addp->last_out(j);
+ assert(st->is_Store(), "store required");
+ _igvn.replace_node(st, st->in(MemNode::Memory));
+ }
+}
+
+// Search for a memory operation for the specified memory slice.
+static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
+ Node *orig_mem = mem;
+ Node *alloc_mem = alloc->in(TypeFunc::Memory);
+ const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
+ while (true) {
+ if (mem == alloc_mem || mem == start_mem ) {
+ return mem; // hit one of our sentinals
+ } else if (mem->is_MergeMem()) {
+ mem = mem->as_MergeMem()->memory_at(alias_idx);
+ } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
+ Node *in = mem->in(0);
+ // we can safely skip over safepoints, calls, locks and membars because we
+ // already know that the object is safe to eliminate.
+ if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) {
+ return in;
+ } else if (in->is_Call()) {
+ CallNode *call = in->as_Call();
+ if (!call->may_modify(tinst, phase)) {
+ mem = call->in(TypeFunc::Memory);
+ }
+ mem = in->in(TypeFunc::Memory);
+ } else if (in->is_MemBar()) {
+ mem = in->in(TypeFunc::Memory);
+ } else {
+ assert(false, "unexpected projection");
+ }
+ } else if (mem->is_Store()) {
+ const TypePtr* atype = mem->as_Store()->adr_type();
+ int adr_idx = Compile::current()->get_alias_index(atype);
+ if (adr_idx == alias_idx) {
+ assert(atype->isa_oopptr(), "address type must be oopptr");
+ int adr_offset = atype->offset();
+ uint adr_iid = atype->is_oopptr()->instance_id();
+ // Array elements references have the same alias_idx
+ // but different offset and different instance_id.
+ if (adr_offset == offset && adr_iid == alloc->_idx)
+ return mem;
+ } else {
+ assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
+ }
+ mem = mem->in(MemNode::Memory);
+ } else {
+ return mem;
+ }
+ assert(mem != orig_mem, "dead memory loop");
+ }
+}
+
+//
+// Given a Memory Phi, compute a value Phi containing the values from stores
+// on the input paths.
+// Note: this function is recursive, its depth is limied by the "level" argument
+// Returns the computed Phi, or NULL if it cannot compute it.
+Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, Node *alloc, Node_Stack *value_phis, int level) {
+ assert(mem->is_Phi(), "sanity");
+ int alias_idx = C->get_alias_index(adr_t);
+ int offset = adr_t->offset();
+ int instance_id = adr_t->instance_id();
+
+ // Check if an appropriate value phi already exists.
+ Node* region = mem->in(0);
+ for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
+ Node* phi = region->fast_out(k);
+ if (phi->is_Phi() && phi != mem &&
+ phi->as_Phi()->is_same_inst_field(phi_type, instance_id, alias_idx, offset)) {
+ return phi;
+ }
+ }
+ // Check if an appropriate new value phi already exists.
+ Node* new_phi = NULL;
+ uint size = value_phis->size();
+ for (uint i=0; i < size; i++) {
+ if ( mem->_idx == value_phis->index_at(i) ) {
+ return value_phis->node_at(i);
+ }
+ }
+
+ if (level <= 0) {
+ return NULL; // Give up: phi tree too deep
+ }
+ Node *start_mem = C->start()->proj_out(TypeFunc::Memory);
+ Node *alloc_mem = alloc->in(TypeFunc::Memory);
+
+ uint length = mem->req();
+ GrowableArray <Node *> values(length, length, NULL);
+
+ // create a new Phi for the value
+ PhiNode *phi = new (C, length) PhiNode(mem->in(0), phi_type, NULL, instance_id, alias_idx, offset);
+ transform_later(phi);
+ value_phis->push(phi, mem->_idx);
+
+ for (uint j = 1; j < length; j++) {
+ Node *in = mem->in(j);
+ if (in == NULL || in->is_top()) {
+ values.at_put(j, in);
+ } else {
+ Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
+ if (val == start_mem || val == alloc_mem) {
+ // hit a sentinel, return appropriate 0 value
+ values.at_put(j, _igvn.zerocon(ft));
+ continue;
+ }
+ if (val->is_Initialize()) {
+ val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
+ }
+ if (val == NULL) {
+ return NULL; // can't find a value on this path
+ }
+ if (val == mem) {
+ values.at_put(j, mem);
+ } else if (val->is_Store()) {
+ values.at_put(j, val->in(MemNode::ValueIn));
+ } else if(val->is_Proj() && val->in(0) == alloc) {
+ values.at_put(j, _igvn.zerocon(ft));
+ } else if (val->is_Phi()) {
+ val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
+ if (val == NULL) {
+ return NULL;
+ }
+ values.at_put(j, val);
+ } else {
+ assert(false, "unknown node on this path");
+ return NULL; // unknown node on this path
+ }
+ }
+ }
+ // Set Phi's inputs
+ for (uint j = 1; j < length; j++) {
+ if (values.at(j) == mem) {
+ phi->init_req(j, phi);
+ } else {
+ phi->init_req(j, values.at(j));
+ }
+ }
+ return phi;
+}
+
+// Search the last value stored into the object's field.
+Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) {
+ assert(adr_t->is_known_instance_field(), "instance required");
+ int instance_id = adr_t->instance_id();
+ assert((uint)instance_id == alloc->_idx, "wrong allocation");
+
+ int alias_idx = C->get_alias_index(adr_t);
+ int offset = adr_t->offset();
+ Node *start_mem = C->start()->proj_out(TypeFunc::Memory);
+ Node *alloc_ctrl = alloc->in(TypeFunc::Control);
+ Node *alloc_mem = alloc->in(TypeFunc::Memory);
+ Arena *a = Thread::current()->resource_area();
+ VectorSet visited(a);
+
+
+ bool done = sfpt_mem == alloc_mem;
+ Node *mem = sfpt_mem;
+ while (!done) {
+ if (visited.test_set(mem->_idx)) {
+ return NULL; // found a loop, give up
+ }
+ mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
+ if (mem == start_mem || mem == alloc_mem) {
+ done = true; // hit a sentinel, return appropriate 0 value
+ } else if (mem->is_Initialize()) {
+ mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
+ if (mem == NULL) {
+ done = true; // Something go wrong.
+ } else if (mem->is_Store()) {
+ const TypePtr* atype = mem->as_Store()->adr_type();
+ assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
+ done = true;
+ }
+ } else if (mem->is_Store()) {
+ const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
+ assert(atype != NULL, "address type must be oopptr");
+ assert(C->get_alias_index(atype) == alias_idx &&
+ atype->is_known_instance_field() && atype->offset() == offset &&
+ atype->instance_id() == instance_id, "store is correct memory slice");
+ done = true;
+ } else if (mem->is_Phi()) {
+ // try to find a phi's unique input
+ Node *unique_input = NULL;
+ Node *top = C->top();
+ for (uint i = 1; i < mem->req(); i++) {
+ Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
+ if (n == NULL || n == top || n == mem) {
+ continue;
+ } else if (unique_input == NULL) {
+ unique_input = n;
+ } else if (unique_input != n) {
+ unique_input = top;
+ break;
+ }
+ }
+ if (unique_input != NULL && unique_input != top) {
+ mem = unique_input;
+ } else {
+ done = true;
+ }
+ } else {
+ assert(false, "unexpected node");
+ }
+ }
+ if (mem != NULL) {
+ if (mem == start_mem || mem == alloc_mem) {
+ // hit a sentinel, return appropriate 0 value
+ return _igvn.zerocon(ft);
+ } else if (mem->is_Store()) {
+ return mem->in(MemNode::ValueIn);
+ } else if (mem->is_Phi()) {
+ // attempt to produce a Phi reflecting the values on the input paths of the Phi
+ Node_Stack value_phis(a, 8);
+ Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
+ if (phi != NULL) {
+ return phi;
+ } else {
+ // Kill all new Phis
+ while(value_phis.is_nonempty()) {
+ Node* n = value_phis.node();
+ _igvn.hash_delete(n);
+ _igvn.subsume_node(n, C->top());
+ value_phis.pop();
+ }
+ }
+ }
+ }
+ // Something go wrong.
+ return NULL;
+}
+
+// Check the possibility of scalar replacement.
+bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
+ // Scan the uses of the allocation to check for anything that would
+ // prevent us from eliminating it.
+ NOT_PRODUCT( const char* fail_eliminate = NULL; )
+ DEBUG_ONLY( Node* disq_node = NULL; )
+ bool can_eliminate = true;
+
+ Node* res = alloc->result_cast();
+ const TypeOopPtr* res_type = NULL;
+ if (res == NULL) {
+ // All users were eliminated.
+ } else if (!res->is_CheckCastPP()) {
+ alloc->_is_scalar_replaceable = false; // don't try again
+ NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
+ can_eliminate = false;
+ } else {
+ res_type = _igvn.type(res)->isa_oopptr();
+ if (res_type == NULL) {
+ NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
+ can_eliminate = false;
+ } else if (res_type->isa_aryptr()) {
+ int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
+ if (length < 0) {
+ NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
+ can_eliminate = false;
+ }
+ }
+ }
+
+ if (can_eliminate && res != NULL) {
+ for (DUIterator_Fast jmax, j = res->fast_outs(jmax);
+ j < jmax && can_eliminate; j++) {
+ Node* use = res->fast_out(j);
+
+ if (use->is_AddP()) {
+ const TypePtr* addp_type = _igvn.type(use)->is_ptr();
+ int offset = addp_type->offset();
+
+ if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
+ NOT_PRODUCT(fail_eliminate = "Undefined field referrence";)
+ can_eliminate = false;
+ break;
+ }
+ for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
+ k < kmax && can_eliminate; k++) {
+ Node* n = use->fast_out(k);
+ if (!n->is_Store() && n->Opcode() != Op_CastP2X) {
+ DEBUG_ONLY(disq_node = n;)
+ if (n->is_Load() || n->is_LoadStore()) {
+ NOT_PRODUCT(fail_eliminate = "Field load";)
+ } else {
+ NOT_PRODUCT(fail_eliminate = "Not store field referrence";)
+ }
+ can_eliminate = false;
+ }
+ }
+ } else if (use->is_SafePoint()) {
+ SafePointNode* sfpt = use->as_SafePoint();
+ if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
+ // Object is passed as argument.
+ DEBUG_ONLY(disq_node = use;)
+ NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
+ can_eliminate = false;
+ }
+ Node* sfptMem = sfpt->memory();
+ if (sfptMem == NULL || sfptMem->is_top()) {
+ DEBUG_ONLY(disq_node = use;)
+ NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";)
+ can_eliminate = false;
+ } else {
+ safepoints.append_if_missing(sfpt);
+ }
+ } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
+ if (use->is_Phi()) {
+ if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
+ NOT_PRODUCT(fail_eliminate = "Object is return value";)
+ } else {
+ NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
+ }
+ DEBUG_ONLY(disq_node = use;)
+ } else {
+ if (use->Opcode() == Op_Return) {
+ NOT_PRODUCT(fail_eliminate = "Object is return value";)
+ }else {
+ NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
+ }
+ DEBUG_ONLY(disq_node = use;)
+ }
+ can_eliminate = false;
+ }
+ }
+ }
+
+#ifndef PRODUCT
+ if (PrintEliminateAllocations) {
+ if (can_eliminate) {
+ tty->print("Scalar ");
+ if (res == NULL)
+ alloc->dump();
+ else
+ res->dump();
+ } else {
+ tty->print("NotScalar (%s)", fail_eliminate);
+ if (res == NULL)
+ alloc->dump();
+ else
+ res->dump();
+#ifdef ASSERT
+ if (disq_node != NULL) {
+ tty->print(" >>>> ");
+ disq_node->dump();
+ }
+#endif /*ASSERT*/
+ }
+ }
+#endif
+ return can_eliminate;
+}
+
+// Do scalar replacement.
+bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
+ GrowableArray <SafePointNode *> safepoints_done;
+
+ ciKlass* klass = NULL;
+ ciInstanceKlass* iklass = NULL;
+ int nfields = 0;
+ int array_base;
+ int element_size;
+ BasicType basic_elem_type;
+ ciType* elem_type;
+
+ Node* res = alloc->result_cast();
+ const TypeOopPtr* res_type = NULL;
+ if (res != NULL) { // Could be NULL when there are no users
+ res_type = _igvn.type(res)->isa_oopptr();
+ }
+
+ if (res != NULL) {
+ klass = res_type->klass();
+ if (res_type->isa_instptr()) {
+ // find the fields of the class which will be needed for safepoint debug information
+ assert(klass->is_instance_klass(), "must be an instance klass.");
+ iklass = klass->as_instance_klass();
+ nfields = iklass->nof_nonstatic_fields();
+ } else {
+ // find the array's elements which will be needed for safepoint debug information
+ nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
+ assert(klass->is_array_klass() && nfields >= 0, "must be an array klass.");
+ elem_type = klass->as_array_klass()->element_type();
+ basic_elem_type = elem_type->basic_type();
+ array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
+ element_size = type2aelembytes(basic_elem_type);
+ }
+ }
+ //
+ // Process the safepoint uses
+ //
+ while (safepoints.length() > 0) {
+ SafePointNode* sfpt = safepoints.pop();
+ Node* mem = sfpt->memory();
+ uint first_ind = sfpt->req();
+ SafePointScalarObjectNode* sobj = new (C, 1) SafePointScalarObjectNode(res_type,
+#ifdef ASSERT
+ alloc,
+#endif
+ first_ind, nfields);
+ sobj->init_req(0, sfpt->in(TypeFunc::Control));
+ transform_later(sobj);
+
+ // Scan object's fields adding an input to the safepoint for each field.
+ for (int j = 0; j < nfields; j++) {
+ intptr_t offset;
+ ciField* field = NULL;
+ if (iklass != NULL) {
+ field = iklass->nonstatic_field_at(j);
+ offset = field->offset();
+ elem_type = field->type();
+ basic_elem_type = field->layout_type();
+ } else {
+ offset = array_base + j * (intptr_t)element_size;
+ }
+
+ const Type *field_type;
+ // The next code is taken from Parse::do_get_xxx().
+ if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) {
+ if (!elem_type->is_loaded()) {
+ field_type = TypeInstPtr::BOTTOM;
+ } else if (field != NULL && field->is_constant()) {
+ // This can happen if the constant oop is non-perm.
+ ciObject* con = field->constant_value().as_object();
+ // Do not "join" in the previous type; it doesn't add value,
+ // and may yield a vacuous result if the field is of interface type.
+ field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
+ assert(field_type != NULL, "field singleton type must be consistent");
+ } else {
+ field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
+ }
+ if (UseCompressedOops) {
+ field_type = field_type->make_narrowoop();
+ basic_elem_type = T_NARROWOOP;
+ }
+ } else {
+ field_type = Type::get_const_basic_type(basic_elem_type);
+ }
+
+ const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr();
+
+ Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc);
+ if (field_val == NULL) {
+ // we weren't able to find a value for this field,
+ // give up on eliminating this allocation
+ alloc->_is_scalar_replaceable = false; // don't try again
+ // remove any extra entries we added to the safepoint
+ uint last = sfpt->req() - 1;
+ for (int k = 0; k < j; k++) {
+ sfpt->del_req(last--);
+ }
+ // rollback processed safepoints
+ while (safepoints_done.length() > 0) {
+ SafePointNode* sfpt_done = safepoints_done.pop();
+ // remove any extra entries we added to the safepoint
+ last = sfpt_done->req() - 1;
+ for (int k = 0; k < nfields; k++) {
+ sfpt_done->del_req(last--);
+ }
+ JVMState *jvms = sfpt_done->jvms();
+ jvms->set_endoff(sfpt_done->req());
+ // Now make a pass over the debug information replacing any references
+ // to SafePointScalarObjectNode with the allocated object.
+ int start = jvms->debug_start();
+ int end = jvms->debug_end();
+ for (int i = start; i < end; i++) {
+ if (sfpt_done->in(i)->is_SafePointScalarObject()) {
+ SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject();
+ if (scobj->first_index() == sfpt_done->req() &&
+ scobj->n_fields() == (uint)nfields) {
+ assert(scobj->alloc() == alloc, "sanity");
+ sfpt_done->set_req(i, res);
+ }
+ }
+ }
+ }
+#ifndef PRODUCT
+ if (PrintEliminateAllocations) {
+ if (field != NULL) {
+ tty->print("=== At SafePoint node %d can't find value of Field: ",
+ sfpt->_idx);
+ field->print();
+ int field_idx = C->get_alias_index(field_addr_type);
+ tty->print(" (alias_idx=%d)", field_idx);
+ } else { // Array's element
+ tty->print("=== At SafePoint node %d can't find value of array element [%d]",
+ sfpt->_idx, j);
+ }
+ tty->print(", which prevents elimination of: ");
+ if (res == NULL)
+ alloc->dump();
+ else
+ res->dump();
+ }
+#endif
+ return false;
+ }
+ if (UseCompressedOops && field_type->isa_narrowoop()) {
+ // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
+ // to be able scalar replace the allocation.
+ if (field_val->is_EncodeP()) {
+ field_val = field_val->in(1);
+ } else {
+ field_val = transform_later(new (C, 2) DecodeNNode(field_val, field_val->bottom_type()->make_ptr()));
+ }
+ }
+ sfpt->add_req(field_val);
+ }
+ JVMState *jvms = sfpt->jvms();
+ jvms->set_endoff(sfpt->req());
+ // Now make a pass over the debug information replacing any references
+ // to the allocated object with "sobj"
+ int start = jvms->debug_start();
+ int end = jvms->debug_end();
+ for (int i = start; i < end; i++) {
+ if (sfpt->in(i) == res) {
+ sfpt->set_req(i, sobj);
+ }
+ }
+ safepoints_done.append_if_missing(sfpt); // keep it for rollback
+ }
+ return true;
+}
+
+// Process users of eliminated allocation.
+void PhaseMacroExpand::process_users_of_allocation(AllocateNode *alloc) {
+ Node* res = alloc->result_cast();
+ if (res != NULL) {
+ for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
+ Node *use = res->last_out(j);
+ uint oc1 = res->outcnt();
+
+ if (use->is_AddP()) {
+ for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
+ Node *n = use->last_out(k);
+ uint oc2 = use->outcnt();
+ if (n->is_Store()) {
+ _igvn.replace_node(n, n->in(MemNode::Memory));
+ } else {
+ assert( n->Opcode() == Op_CastP2X, "CastP2X required");
+ eliminate_card_mark(n);
+ }
+ k -= (oc2 - use->outcnt());
+ }
+ } else {
+ assert( !use->is_SafePoint(), "safepoint uses must have been already elimiated");
+ assert( use->Opcode() == Op_CastP2X, "CastP2X required");
+ eliminate_card_mark(use);
+ }
+ j -= (oc1 - res->outcnt());
+ }
+ assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
+ _igvn.remove_dead_node(res);
+ }
+
+ //
+ // Process other users of allocation's projections
+ //
+ if (_resproj != NULL && _resproj->outcnt() != 0) {
+ for (DUIterator_Last jmin, j = _resproj->last_outs(jmin); j >= jmin; ) {
+ Node *use = _resproj->last_out(j);
+ uint oc1 = _resproj->outcnt();
+ if (use->is_Initialize()) {
+ // Eliminate Initialize node.
+ InitializeNode *init = use->as_Initialize();
+ assert(init->outcnt() <= 2, "only a control and memory projection expected");
+ Node *ctrl_proj = init->proj_out(TypeFunc::Control);
+ if (ctrl_proj != NULL) {
+ assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection");
+ _igvn.replace_node(ctrl_proj, _fallthroughcatchproj);
+ }
+ Node *mem_proj = init->proj_out(TypeFunc::Memory);
+ if (mem_proj != NULL) {
+ Node *mem = init->in(TypeFunc::Memory);
+#ifdef ASSERT
+ if (mem->is_MergeMem()) {
+ assert(mem->in(TypeFunc::Memory) == _memproj_fallthrough, "allocation memory projection");
+ } else {
+ assert(mem == _memproj_fallthrough, "allocation memory projection");
+ }
+#endif
+ _igvn.replace_node(mem_proj, mem);
+ }
+ } else if (use->is_AddP()) {
+ // raw memory addresses used only by the initialization
+ _igvn.hash_delete(use);
+ _igvn.subsume_node(use, C->top());
+ } else {
+ assert(false, "only Initialize or AddP expected");
+ }
+ j -= (oc1 - _resproj->outcnt());
+ }
+ }
+ if (_fallthroughcatchproj != NULL) {
+ _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control));
+ }
+ if (_memproj_fallthrough != NULL) {
+ _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory));
+ }
+ if (_memproj_catchall != NULL) {
+ _igvn.replace_node(_memproj_catchall, C->top());
+ }
+ if (_ioproj_fallthrough != NULL) {
+ _igvn.replace_node(_ioproj_fallthrough, alloc->in(TypeFunc::I_O));
+ }
+ if (_ioproj_catchall != NULL) {
+ _igvn.replace_node(_ioproj_catchall, C->top());
+ }
+ if (_catchallcatchproj != NULL) {
+ _igvn.replace_node(_catchallcatchproj, C->top());
+ }
+}
+
+bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
+
+ if (!EliminateAllocations || !alloc->_is_scalar_replaceable) {
+ return false;
+ }
+
+ extract_call_projections(alloc);
+
+ GrowableArray <SafePointNode *> safepoints;
+ if (!can_eliminate_allocation(alloc, safepoints)) {
+ return false;
+ }
+
+ if (!scalar_replacement(alloc, safepoints)) {
+ return false;
+ }
+
+ process_users_of_allocation(alloc);
+
+#ifndef PRODUCT
+if (PrintEliminateAllocations) {
+ if (alloc->is_AllocateArray())
+ tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
+ else
+ tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
+}
+#endif
+
+ return true;
+}
+
//---------------------------set_eden_pointers-------------------------
void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) {
if (UseTLAB) { // Private allocation: load from TLS
Node* thread = transform_later(new (C, 1) ThreadLocalNode());
@@ -188,20 +870,20 @@
}
Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) {
Node* adr = basic_plus_adr(base, offset);
- const TypePtr* adr_type = TypeRawPtr::BOTTOM;
- Node* value = LoadNode::make(C, ctl, mem, adr, adr_type, value_type, bt);
+ const TypePtr* adr_type = adr->bottom_type()->is_ptr();
+ Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt);
transform_later(value);
return value;
}
Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) {
Node* adr = basic_plus_adr(base, offset);
- mem = StoreNode::make(C, ctl, mem, adr, NULL, value, bt);
+ mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt);
transform_later(mem);
return mem;
}
//=============================================================================
@@ -271,29 +953,18 @@
Node* i_o = alloc->in(TypeFunc::I_O);
Node* size_in_bytes = alloc->in(AllocateNode::AllocSize);
Node* klass_node = alloc->in(AllocateNode::KlassNode);
Node* initial_slow_test = alloc->in(AllocateNode::InitialTest);
- Node* eden_top_adr;
- Node* eden_end_adr;
- set_eden_pointers(eden_top_adr, eden_end_adr);
+ // With escape analysis, the entire memory state was needed to be able to
+ // eliminate the allocation. Since the allocations cannot be eliminated,
+ // optimize it to the raw slice.
+ if (mem->is_MergeMem()) {
+ mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
+ }
- uint raw_idx = C->get_alias_index(TypeRawPtr::BOTTOM);
assert(ctrl != NULL, "must have control");
-
- // Load Eden::end. Loop invariant and hoisted.
- //
- // Note: We set the control input on "eden_end" and "old_eden_top" when using
- // a TLAB to work around a bug where these values were being moved across
- // a safepoint. These are not oops, so they cannot be include in the oop
- // map, but the can be changed by a GC. The proper way to fix this would
- // be to set the raw memory state when generating a SafepointNode. However
- // this will require extensive changes to the loop optimization in order to
- // prevent a degradation of the optimization.
- // See comment in memnode.hpp, around line 227 in class LoadPNode.
- Node* eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS);
-
// We need a Region and corresponding Phi's to merge the slow-path and fast-path results.
// they will not be used if "always_slow" is set
enum { slow_result_path = 1, fast_result_path = 2 };
Node *result_region;
Node *result_phi_rawmem;
@@ -309,16 +980,19 @@
initial_slow_test = NULL;
} else {
initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn);
}
- if (DTraceAllocProbes) {
+ if (DTraceAllocProbes ||
+ !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() ||
+ (UseConcMarkSweepGC && CMSIncrementalMode))) {
// Force slow-path allocation
always_slow = true;
initial_slow_test = NULL;
}
+
enum { too_big_or_final_path = 1, need_gc_path = 2 };
Node *slow_region = NULL;
Node *toobig_false = ctrl;
assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent");
@@ -343,10 +1017,27 @@
}
Node *slow_mem = mem; // save the current memory state for slow path
// generate the fast allocation code unless we know that the initial test will always go slow
if (!always_slow) {
+ Node* eden_top_adr;
+ Node* eden_end_adr;
+
+ set_eden_pointers(eden_top_adr, eden_end_adr);
+
+ // Load Eden::end. Loop invariant and hoisted.
+ //
+ // Note: We set the control input on "eden_end" and "old_eden_top" when using
+ // a TLAB to work around a bug where these values were being moved across
+ // a safepoint. These are not oops, so they cannot be include in the oop
+ // map, but the can be changed by a GC. The proper way to fix this would
+ // be to set the raw memory state when generating a SafepointNode. However
+ // this will require extensive changes to the loop optimization in order to
+ // prevent a degradation of the optimization.
+ // See comment in memnode.hpp, around line 227 in class LoadPNode.
+ Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS);
+
// allocate the Region and Phi nodes for the result
result_region = new (C, 3) RegionNode(3);
result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM );
result_phi_rawoop = new (C, 3) PhiNode( result_region, TypeRawPtr::BOTTOM );
result_phi_i_o = new (C, 3) PhiNode( result_region, Type::ABIO ); // I/O is used for Prefetch
@@ -633,18 +1324,19 @@
mark_node = make_load(NULL, rawmem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeRawPtr::BOTTOM, T_ADDRESS);
} else {
mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype()));
}
rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS);
+
rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_OBJECT);
int header_size = alloc->minimum_header_size(); // conservatively small
// Array length
if (length != NULL) { // Arrays need length field
rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
// conservatively small header size:
- header_size = sizeof(arrayOopDesc);
+ header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
if (k->is_array_klass()) // we know the exact header size in most cases:
header_size = Klass::layout_helper_header_size(k->layout_helper());
}
@@ -669,11 +1361,10 @@
// We can also try to do some peephole optimizations,
// such as combining some adjacent subword stores.
rawmem = init->complete_stores(control, rawmem, object,
header_size, size_in_bytes, &_igvn);
}
-
// We have no more use for this link, since the AllocateNode goes away:
init->set_req(InitializeNode::RawAddress, top());
// (If we keep the link, it just confuses the register allocator,
// who thinks he sees a real use of the address by the membar.)
}
@@ -814,55 +1505,349 @@
// eliminate the node without expanding it.
//
// Note: The membar's associated with the lock/unlock are currently not
// eliminated. This should be investigated as a future enhancement.
//
-void PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
+bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
+
+ if (!alock->is_eliminated()) {
+ return false;
+ }
+ if (alock->is_Lock() && !alock->is_coarsened()) {
+ // Create new "eliminated" BoxLock node and use it
+ // in monitor debug info for the same object.
+ BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
+ Node* obj = alock->obj_node();
+ if (!oldbox->is_eliminated()) {
+ BoxLockNode* newbox = oldbox->clone()->as_BoxLock();
+ newbox->set_eliminated();
+ transform_later(newbox);
+ // Replace old box node with new box for all users
+ // of the same object.
+ for (uint i = 0; i < oldbox->outcnt();) {
+
+ bool next_edge = true;
+ Node* u = oldbox->raw_out(i);
+ if (u == alock) {
+ i++;
+ continue; // It will be removed below
+ }
+ if (u->is_Lock() &&
+ u->as_Lock()->obj_node() == obj &&
+ // oldbox could be referenced in debug info also
+ u->as_Lock()->box_node() == oldbox) {
+ assert(u->as_Lock()->is_eliminated(), "sanity");
+ _igvn.hash_delete(u);
+ u->set_req(TypeFunc::Parms + 1, newbox);
+ next_edge = false;
+#ifdef ASSERT
+ } else if (u->is_Unlock() && u->as_Unlock()->obj_node() == obj) {
+ assert(u->as_Unlock()->is_eliminated(), "sanity");
+#endif
+ }
+ // Replace old box in monitor debug info.
+ if (u->is_SafePoint() && u->as_SafePoint()->jvms()) {
+ SafePointNode* sfn = u->as_SafePoint();
+ JVMState* youngest_jvms = sfn->jvms();
+ int max_depth = youngest_jvms->depth();
+ for (int depth = 1; depth <= max_depth; depth++) {
+ JVMState* jvms = youngest_jvms->of_depth(depth);
+ int num_mon = jvms->nof_monitors();
+ // Loop over monitors
+ for (int idx = 0; idx < num_mon; idx++) {
+ Node* obj_node = sfn->monitor_obj(jvms, idx);
+ Node* box_node = sfn->monitor_box(jvms, idx);
+ if (box_node == oldbox && obj_node == obj) {
+ int j = jvms->monitor_box_offset(idx);
+ _igvn.hash_delete(u);
+ u->set_req(j, newbox);
+ next_edge = false;
+ }
+ } // for (int idx = 0;
+ } // for (int depth = 1;
+ } // if (u->is_SafePoint()
+ if (next_edge) i++;
+ } // for (uint i = 0; i < oldbox->outcnt();)
+ } // if (!oldbox->is_eliminated())
+ } // if (alock->is_Lock() && !lock->is_coarsened())
+
+ #ifndef PRODUCT
+ if (PrintEliminateLocks) {
+ if (alock->is_Lock()) {
+ tty->print_cr("++++ Eliminating: %d Lock", alock->_idx);
+ } else {
+ tty->print_cr("++++ Eliminating: %d Unlock", alock->_idx);
+ }
+ }
+ #endif
+
Node* mem = alock->in(TypeFunc::Memory);
+ Node* ctrl = alock->in(TypeFunc::Control);
+
+ extract_call_projections(alock);
+ // There are 2 projections from the lock. The lock node will
+ // be deleted when its last use is subsumed below.
+ assert(alock->outcnt() == 2 &&
+ _fallthroughproj != NULL &&
+ _memproj_fallthrough != NULL,
+ "Unexpected projections from Lock/Unlock");
+
+ Node* fallthroughproj = _fallthroughproj;
+ Node* memproj_fallthrough = _memproj_fallthrough;
// The memory projection from a lock/unlock is RawMem
// The input to a Lock is merged memory, so extract its RawMem input
// (unless the MergeMem has been optimized away.)
if (alock->is_Lock()) {
- if (mem->is_MergeMem())
- mem = mem->as_MergeMem()->in(Compile::AliasIdxRaw);
+ // Seach for MemBarAcquire node and delete it also.
+ MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
+ assert(membar != NULL && membar->Opcode() == Op_MemBarAcquire, "");
+ Node* ctrlproj = membar->proj_out(TypeFunc::Control);
+ Node* memproj = membar->proj_out(TypeFunc::Memory);
+ _igvn.hash_delete(ctrlproj);
+ _igvn.subsume_node(ctrlproj, fallthroughproj);
+ _igvn.hash_delete(memproj);
+ _igvn.subsume_node(memproj, memproj_fallthrough);
+
+ // Delete FastLock node also if this Lock node is unique user
+ // (a loop peeling may clone a Lock node).
+ Node* flock = alock->as_Lock()->fastlock_node();
+ if (flock->outcnt() == 1) {
+ assert(flock->unique_out() == alock, "sanity");
+ _igvn.hash_delete(flock);
+ _igvn.subsume_node(flock, top());
+ }
}
- extract_call_projections(alock);
- // There are 2 projections from the lock. The lock node will
- // be deleted when its last use is subsumed below.
- assert(alock->outcnt() == 2 && _fallthroughproj != NULL &&
- _memproj_fallthrough != NULL, "Unexpected projections from Lock/Unlock");
- _igvn.hash_delete(_fallthroughproj);
- _igvn.subsume_node(_fallthroughproj, alock->in(TypeFunc::Control));
- _igvn.hash_delete(_memproj_fallthrough);
- _igvn.subsume_node(_memproj_fallthrough, mem);
- return;
+ // Seach for MemBarRelease node and delete it also.
+ if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() &&
+ ctrl->in(0)->is_MemBar()) {
+ MemBarNode* membar = ctrl->in(0)->as_MemBar();
+ assert(membar->Opcode() == Op_MemBarRelease &&
+ mem->is_Proj() && membar == mem->in(0), "");
+ _igvn.hash_delete(fallthroughproj);
+ _igvn.subsume_node(fallthroughproj, ctrl);
+ _igvn.hash_delete(memproj_fallthrough);
+ _igvn.subsume_node(memproj_fallthrough, mem);
+ fallthroughproj = ctrl;
+ memproj_fallthrough = mem;
+ ctrl = membar->in(TypeFunc::Control);
+ mem = membar->in(TypeFunc::Memory);
+ }
+
+ _igvn.hash_delete(fallthroughproj);
+ _igvn.subsume_node(fallthroughproj, ctrl);
+ _igvn.hash_delete(memproj_fallthrough);
+ _igvn.subsume_node(memproj_fallthrough, mem);
+ return true;
}
//------------------------------expand_lock_node----------------------
void PhaseMacroExpand::expand_lock_node(LockNode *lock) {
Node* ctrl = lock->in(TypeFunc::Control);
Node* mem = lock->in(TypeFunc::Memory);
Node* obj = lock->obj_node();
Node* box = lock->box_node();
- Node *flock = lock->fastlock_node();
+ Node* flock = lock->fastlock_node();
- if (lock->is_eliminated()) {
- eliminate_locking_node(lock);
- return;
+ // Make the merge point
+ Node *region;
+ Node *mem_phi;
+ Node *slow_path;
+
+ if (UseOptoBiasInlining) {
+ /*
+ * See the full descrition in MacroAssembler::biased_locking_enter().
+ *
+ * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) {
+ * // The object is biased.
+ * proto_node = klass->prototype_header;
+ * o_node = thread | proto_node;
+ * x_node = o_node ^ mark_word;
+ * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ?
+ * // Done.
+ * } else {
+ * if( (x_node & biased_lock_mask) != 0 ) {
+ * // The klass's prototype header is no longer biased.
+ * cas(&mark_word, mark_word, proto_node)
+ * goto cas_lock;
+ * } else {
+ * // The klass's prototype header is still biased.
+ * if( (x_node & epoch_mask) != 0 ) { // Expired epoch?
+ * old = mark_word;
+ * new = o_node;
+ * } else {
+ * // Different thread or anonymous biased.
+ * old = mark_word & (epoch_mask | age_mask | biased_lock_mask);
+ * new = thread | old;
+ * }
+ * // Try to rebias.
+ * if( cas(&mark_word, old, new) == 0 ) {
+ * // Done.
+ * } else {
+ * goto slow_path; // Failed.
+ * }
+ * }
+ * }
+ * } else {
+ * // The object is not biased.
+ * cas_lock:
+ * if( FastLock(obj) == 0 ) {
+ * // Done.
+ * } else {
+ * slow_path:
+ * OptoRuntime::complete_monitor_locking_Java(obj);
+ * }
+ * }
+ */
+
+ region = new (C, 5) RegionNode(5);
+ // create a Phi for the memory state
+ mem_phi = new (C, 5) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
+
+ Node* fast_lock_region = new (C, 3) RegionNode(3);
+ Node* fast_lock_mem_phi = new (C, 3) PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM);
+
+ // First, check mark word for the biased lock pattern.
+ Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type());
+
+ // Get fast path - mark word has the biased lock pattern.
+ ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node,
+ markOopDesc::biased_lock_mask_in_place,
+ markOopDesc::biased_lock_pattern, true);
+ // fast_lock_region->in(1) is set to slow path.
+ fast_lock_mem_phi->init_req(1, mem);
+
+ // Now check that the lock is biased to the current thread and has
+ // the same epoch and bias as Klass::_prototype_header.
+
+ // Special-case a fresh allocation to avoid building nodes:
+ Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn);
+ if (klass_node == NULL) {
+ Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes());
+ klass_node = transform_later( LoadKlassNode::make(_igvn, mem, k_adr, _igvn.type(k_adr)->is_ptr()) );
+#ifdef _LP64
+ if (UseCompressedOops && klass_node->is_DecodeN()) {
+ assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity");
+ klass_node->in(1)->init_req(0, ctrl);
+ } else
+#endif
+ klass_node->init_req(0, ctrl);
}
+ Node *proto_node = make_load(ctrl, mem, klass_node, Klass::prototype_header_offset_in_bytes() + sizeof(oopDesc), TypeX_X, TypeX_X->basic_type());
- // Make the merge point
- Node *region = new (C, 3) RegionNode(3);
+ Node* thread = transform_later(new (C, 1) ThreadLocalNode());
+ Node* cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread));
+ Node* o_node = transform_later(new (C, 3) OrXNode(cast_thread, proto_node));
+ Node* x_node = transform_later(new (C, 3) XorXNode(o_node, mark_node));
+
+ // Get slow path - mark word does NOT match the value.
+ Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node,
+ (~markOopDesc::age_mask_in_place), 0);
+ // region->in(3) is set to fast path - the object is biased to the current thread.
+ mem_phi->init_req(3, mem);
+
+
+ // Mark word does NOT match the value (thread | Klass::_prototype_header).
+
+
+ // First, check biased pattern.
+ // Get fast path - _prototype_header has the same biased lock pattern.
+ ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node,
+ markOopDesc::biased_lock_mask_in_place, 0, true);
+
+ not_biased_ctrl = fast_lock_region->in(2); // Slow path
+ // fast_lock_region->in(2) - the prototype header is no longer biased
+ // and we have to revoke the bias on this object.
+ // We are going to try to reset the mark of this object to the prototype
+ // value and fall through to the CAS-based locking scheme.
+ Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
+ Node* cas = new (C, 5) StoreXConditionalNode(not_biased_ctrl, mem, adr,
+ proto_node, mark_node);
+ transform_later(cas);
+ Node* proj = transform_later( new (C, 1) SCMemProjNode(cas));
+ fast_lock_mem_phi->init_req(2, proj);
+
+
+ // Second, check epoch bits.
+ Node* rebiased_region = new (C, 3) RegionNode(3);
+ Node* old_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X);
+ Node* new_phi = new (C, 3) PhiNode( rebiased_region, TypeX_X);
+
+ // Get slow path - mark word does NOT match epoch bits.
+ Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node,
+ markOopDesc::epoch_mask_in_place, 0);
+ // The epoch of the current bias is not valid, attempt to rebias the object
+ // toward the current thread.
+ rebiased_region->init_req(2, epoch_ctrl);
+ old_phi->init_req(2, mark_node);
+ new_phi->init_req(2, o_node);
+
+ // rebiased_region->in(1) is set to fast path.
+ // The epoch of the current bias is still valid but we know
+ // nothing about the owner; it might be set or it might be clear.
+ Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place |
+ markOopDesc::age_mask_in_place |
+ markOopDesc::epoch_mask_in_place);
+ Node* old = transform_later(new (C, 3) AndXNode(mark_node, cmask));
+ cast_thread = transform_later(new (C, 2) CastP2XNode(ctrl, thread));
+ Node* new_mark = transform_later(new (C, 3) OrXNode(cast_thread, old));
+ old_phi->init_req(1, old);
+ new_phi->init_req(1, new_mark);
+
+ transform_later(rebiased_region);
+ transform_later(old_phi);
+ transform_later(new_phi);
+
+ // Try to acquire the bias of the object using an atomic operation.
+ // If this fails we will go in to the runtime to revoke the object's bias.
+ cas = new (C, 5) StoreXConditionalNode(rebiased_region, mem, adr,
+ new_phi, old_phi);
+ transform_later(cas);
+ proj = transform_later( new (C, 1) SCMemProjNode(cas));
+
+ // Get slow path - Failed to CAS.
+ not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0);
+ mem_phi->init_req(4, proj);
+ // region->in(4) is set to fast path - the object is rebiased to the current thread.
+
+ // Failed to CAS.
+ slow_path = new (C, 3) RegionNode(3);
+ Node *slow_mem = new (C, 3) PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM);
+
+ slow_path->init_req(1, not_biased_ctrl); // Capture slow-control
+ slow_mem->init_req(1, proj);
+
+ // Call CAS-based locking scheme (FastLock node).
+
+ transform_later(fast_lock_region);
+ transform_later(fast_lock_mem_phi);
+
+ // Get slow path - FastLock failed to lock the object.
+ ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0);
+ mem_phi->init_req(2, fast_lock_mem_phi);
+ // region->in(2) is set to fast path - the object is locked to the current thread.
+
+ slow_path->init_req(2, ctrl); // Capture slow-control
+ slow_mem->init_req(2, fast_lock_mem_phi);
+
+ transform_later(slow_path);
+ transform_later(slow_mem);
+ // Reset lock's memory edge.
+ lock->set_req(TypeFunc::Memory, slow_mem);
+
+ } else {
+ region = new (C, 3) RegionNode(3);
+ // create a Phi for the memory state
+ mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
- Node *bol = transform_later(new (C, 2) BoolNode(flock,BoolTest::ne));
- Node *iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
// Optimize test; set region slot 2
- Node *slow_path = opt_iff(region,iff);
+ slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0);
+ mem_phi->init_req(2, mem);
+ }
// Make slow path call
CallNode *call = make_slow_call( (CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(), OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path, obj, box );
extract_call_projections(call);
@@ -884,47 +1869,53 @@
region->init_req(1, slow_ctrl);
// region inputs are now complete
transform_later(region);
_igvn.subsume_node(_fallthroughproj, region);
- // create a Phi for the memory state
- Node *mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
- Node *memproj = transform_later( new (C, 1) ProjNode(call, TypeFunc::Memory) );
+ Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) );
mem_phi->init_req(1, memproj );
- mem_phi->init_req(2, mem);
transform_later(mem_phi);
_igvn.hash_delete(_memproj_fallthrough);
_igvn.subsume_node(_memproj_fallthrough, mem_phi);
-
-
}
//------------------------------expand_unlock_node----------------------
void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
- Node *ctrl = unlock->in(TypeFunc::Control);
+ Node* ctrl = unlock->in(TypeFunc::Control);
Node* mem = unlock->in(TypeFunc::Memory);
Node* obj = unlock->obj_node();
Node* box = unlock->box_node();
-
- if (unlock->is_eliminated()) {
- eliminate_locking_node(unlock);
- return;
- }
-
// No need for a null check on unlock
// Make the merge point
- RegionNode *region = new (C, 3) RegionNode(3);
+ Node *region;
+ Node *mem_phi;
+
+ if (UseOptoBiasInlining) {
+ // Check for biased locking unlock case, which is a no-op.
+ // See the full descrition in MacroAssembler::biased_locking_exit().
+ region = new (C, 4) RegionNode(4);
+ // create a Phi for the memory state
+ mem_phi = new (C, 4) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
+ mem_phi->init_req(3, mem);
+
+ Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type());
+ ctrl = opt_bits_test(ctrl, region, 3, mark_node,
+ markOopDesc::biased_lock_mask_in_place,
+ markOopDesc::biased_lock_pattern);
+ } else {
+ region = new (C, 3) RegionNode(3);
+ // create a Phi for the memory state
+ mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
+ }
FastUnlockNode *funlock = new (C, 3) FastUnlockNode( ctrl, obj, box );
funlock = transform_later( funlock )->as_FastUnlock();
- Node *bol = transform_later(new (C, 2) BoolNode(funlock,BoolTest::ne));
- Node *iff = new (C, 2) IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
// Optimize test; set region slot 2
- Node *slow_path = opt_iff(region,iff);
+ Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0);
CallNode *call = make_slow_call( (CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), "complete_monitor_unlocking_C", slow_path, obj, box );
extract_call_projections(call);
@@ -942,35 +1933,78 @@
region->init_req(1, slow_ctrl);
// region inputs are now complete
transform_later(region);
_igvn.subsume_node(_fallthroughproj, region);
- // create a Phi for the memory state
- Node *mem_phi = new (C, 3) PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
Node *memproj = transform_later( new(C, 1) ProjNode(call, TypeFunc::Memory) );
mem_phi->init_req(1, memproj );
mem_phi->init_req(2, mem);
transform_later(mem_phi);
_igvn.hash_delete(_memproj_fallthrough);
_igvn.subsume_node(_memproj_fallthrough, mem_phi);
-
-
}
//------------------------------expand_macro_nodes----------------------
// Returns true if a failure occurred.
bool PhaseMacroExpand::expand_macro_nodes() {
if (C->macro_count() == 0)
return false;
- // Make sure expansion will not cause node limit to be exceeded. Worst case is a
- // macro node gets expanded into about 50 nodes. Allow 50% more for optimization
+ // First, attempt to eliminate locks
+ bool progress = true;
+ while (progress) {
+ progress = false;
+ for (int i = C->macro_count(); i > 0; i--) {
+ Node * n = C->macro_node(i-1);
+ bool success = false;
+ debug_only(int old_macro_count = C->macro_count(););
+ if (n->is_AbstractLock()) {
+ success = eliminate_locking_node(n->as_AbstractLock());
+ } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) {
+ _igvn.add_users_to_worklist(n);
+ _igvn.hash_delete(n);
+ _igvn.subsume_node(n, n->in(1));
+ success = true;
+ }
+ assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
+ progress = progress || success;
+ }
+ }
+ // Next, attempt to eliminate allocations
+ progress = true;
+ while (progress) {
+ progress = false;
+ for (int i = C->macro_count(); i > 0; i--) {
+ Node * n = C->macro_node(i-1);
+ bool success = false;
+ debug_only(int old_macro_count = C->macro_count(););
+ switch (n->class_id()) {
+ case Node::Class_Allocate:
+ case Node::Class_AllocateArray:
+ success = eliminate_allocate_node(n->as_Allocate());
+ break;
+ case Node::Class_Lock:
+ case Node::Class_Unlock:
+ assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
+ break;
+ default:
+ assert(false, "unknown node type in macro list");
+ }
+ assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
+ progress = progress || success;
+ }
+ }
+ // Make sure expansion will not cause node limit to be exceeded.
+ // Worst case is a macro node gets expanded into about 50 nodes.
+ // Allow 50% more for optimization.
if (C->check_node_count(C->macro_count() * 75, "out of nodes before macro expansion" ) )
return true;
+
// expand "macro" nodes
// nodes are removed from the macro list as they are processed
while (C->macro_count() > 0) {
- Node * n = C->macro_node(0);
+ int macro_count = C->macro_count();
+ Node * n = C->macro_node(macro_count-1);
assert(n->is_macro(), "only macro nodes expected here");
if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) {
// node is unreachable, so don't try to expand it
C->remove_macro_node(n);
continue;
@@ -989,11 +2023,14 @@
expand_unlock_node(n->as_Unlock());
break;
default:
assert(false, "unknown node type in macro list");
}
+ assert(C->macro_count() < macro_count, "must have deleted a node from macro list");
if (C->failing()) return true;
}
+
+ _igvn.set_delay_transform(false);
_igvn.optimize();
return false;
}