jdk8-mips64-public/hotspot: src/share/vm/opto/idealKit.cpp@98cb887364d3 (annotated)

src/share/vm/opto/idealKit.cpp@98cb887364d3 (annotated)

src/share/vm/opto/idealKit.cpp

Fri, 27 Feb 2009 13:27:09 -0800

author: twisti
date: Fri, 27 Feb 2009 13:27:09 -0800
changeset 1040: 98cb887364d3
parent 631: d1605aabd0a1
child 1286: fc4be448891f
permissions: -rw-r--r--

6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

 /*
  * 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.
  *
  * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_idealKit.cpp.incl"
 // Static initialization
 // This declares the position where vars are kept in the cvstate
 // For some degree of consistency we use the TypeFunc enum to
 // soak up spots in the inputs even though we only use early Control
 // and Memory slots. (So far.)
 const uint IdealKit::first_var = TypeFunc::Parms + 1;
 //----------------------------IdealKit-----------------------------------------
 IdealKit::IdealKit(PhaseGVN &gvn, Node* control, Node* mem, bool delay_all_transforms) :
   _gvn(gvn), C(gvn.C) {
   _initial_ctrl = control;
   _initial_memory = mem;
   _delay_all_transforms = delay_all_transforms;
   _var_ct = 0;
   _cvstate = NULL;
   // We can go memory state free or else we need the entire memory state
   assert(mem == NULL || mem->Opcode() == Op_MergeMem, "memory must be pre-split");
   int init_size = 5;
   _pending_cvstates = new (C->node_arena()) GrowableArray<Node*>(C->node_arena(), init_size, 0, 0);
   _delay_transform  = new (C->node_arena()) GrowableArray<Node*>(C->node_arena(), init_size, 0, 0);
   DEBUG_ONLY(_state = new (C->node_arena()) GrowableArray<int>(C->node_arena(), init_size, 0, 0));
 }
 //-------------------------------if_then-------------------------------------
 // Create:  if(left relop right)
 //          /  \
 //   iffalse    iftrue
 // Push the iffalse cvstate onto the stack. The iftrue becomes the current cvstate.
 void IdealKit::if_then(Node* left, BoolTest::mask relop,
                        Node* right, float prob, float cnt, bool push_new_state) {
   assert((state() & (BlockS|LoopS|IfThenS|ElseS)), "bad state for new If");
   Node* bol;
   if (left->bottom_type()->isa_ptr() == NULL) {
     if (left->bottom_type()->isa_int() != NULL) {
       bol = Bool(CmpI(left, right), relop);
     } else {
       assert(left->bottom_type()->isa_long() != NULL, "what else?");
       bol = Bool(CmpL(left, right), relop);
     }
   } else {
     bol = Bool(CmpP(left, right), relop);
   }
   // Delay gvn.tranform on if-nodes until construction is finished
   // to prevent a constant bool input from discarding a control output.
   IfNode* iff = delay_transform(new (C, 2) IfNode(ctrl(), bol, prob, cnt))->as_If();
   Node* then  = IfTrue(iff);
   Node* elsen = IfFalse(iff);
   Node* else_cvstate = copy_cvstate();
   else_cvstate->set_req(TypeFunc::Control, elsen);
   _pending_cvstates->push(else_cvstate);
   DEBUG_ONLY(if (push_new_state) _state->push(IfThenS));
   set_ctrl(then);
 }
 //-------------------------------else_-------------------------------------
 // Pop the else cvstate off the stack, and push the (current) then cvstate.
 // The else cvstate becomes the current cvstate.
 void IdealKit::else_() {
   assert(state() == IfThenS, "bad state for new Else");
   Node* else_cvstate = _pending_cvstates->pop();
   DEBUG_ONLY(_state->pop());
   // save current (then) cvstate for later use at endif
   _pending_cvstates->push(_cvstate);
   DEBUG_ONLY(_state->push(ElseS));
   _cvstate = else_cvstate;
 }
 //-------------------------------end_if-------------------------------------
 // Merge the "then" and "else" cvstates.
 //
 // The if_then() pushed the current state for later use
 // as the initial state for a future "else" clause.  The
 // current state then became the initial state for the
 // then clause.  If an "else" clause was encountered, it will
 // pop the top state and use it for it's initial state.
 // It will also push the current state (the state at the end of
 // the "then" clause) for latter use at the end_if.
 //
 // At the endif, the states are:
 // 1) else exists a) current state is end of "else" clause
 //                b) top stack state is end of "then" clause
 //
 // 2) no else:    a) current state is end of "then" clause
 //                b) top stack state is from the "if_then" which
 //                   would have been the initial state of the else.
 //
 // Merging the states is accomplished by:
 //   1) make a label for the merge
 //   2) terminate the current state with a goto to the label
 //   3) pop the top state from the stack and make it the
 //        current state
 //   4) bind the label at the current state.  Binding a label
 //        terminates the current state with a goto to the
 //        label and makes the label's state the current state.
 //
 void IdealKit::end_if() {
   assert(state() & (IfThenS|ElseS), "bad state for new Endif");
   Node* lab = make_label(1);
   // Node* join_state = _pending_cvstates->pop();
                   /* merging, join */
   goto_(lab);
   _cvstate = _pending_cvstates->pop();
   bind(lab);
   DEBUG_ONLY(_state->pop());
 }
 //-------------------------------loop-------------------------------------
 // Create the loop head portion (*) of:
 //  *     iv = init
 //  *  top: (region node)
 //  *     if (iv relop limit) {
 //           loop body
 //           i = i + 1
 //           goto top
 //  *     } else // exits loop
 //
 // Pushes the loop top cvstate first, then the else (loop exit) cvstate
 // onto the stack.
 void IdealKit::loop(IdealVariable& iv, Node* init, BoolTest::mask relop, Node* limit, float prob, float cnt) {
   assert((state() & (BlockS|LoopS|IfThenS|ElseS)), "bad state for new loop");
   set(iv, init);
   Node* head = make_label(1);
   bind(head);
   _pending_cvstates->push(head); // push for use at end_loop
   _cvstate = copy_cvstate();
   if_then(value(iv), relop, limit, prob, cnt, false /* no new state */);
   DEBUG_ONLY(_state->push(LoopS));
   assert(ctrl()->is_IfTrue(), "true branch stays in loop");
   assert(_pending_cvstates->top()->in(TypeFunc::Control)->is_IfFalse(), "false branch exits loop");
 }
 //-------------------------------end_loop-------------------------------------
 // Creates the goto top label.
 // Expects the else (loop exit) cvstate to be on top of the
 // stack, and the loop top cvstate to be 2nd.
 void IdealKit::end_loop() {
   assert((state() == LoopS), "bad state for new end_loop");
   Node* exit = _pending_cvstates->pop();
   Node* head = _pending_cvstates->pop();
   goto_(head);
   clear(head);
   DEBUG_ONLY(_state->pop());
   _cvstate = exit;
 }
 //-------------------------------make_label-------------------------------------
 // Creates a label.  The number of goto's
 // must be specified (which should be 1 less than
 // the number of precedessors.)
 Node* IdealKit::make_label(int goto_ct) {
   assert(_cvstate != NULL, "must declare variables before labels");
   Node* lab = new_cvstate();
   int sz = 1 + goto_ct + 1 /* fall thru */;
   Node* reg = delay_transform(new (C, sz) RegionNode(sz));
   lab->init_req(TypeFunc::Control, reg);
   return lab;
 }
 //-------------------------------bind-------------------------------------
 // Bind a label at the current cvstate by simulating
 // a goto to the label.
 void IdealKit::bind(Node* lab) {
   goto_(lab, true /* bind */);
   _cvstate = lab;
 }
 //-------------------------------goto_-------------------------------------
 // Make the current cvstate a predecessor of the label,
 // creating phi's to merge values.  If bind is true and
 // this is not the last control edge, then ensure that
 // all live values have phis created. Used to create phis
 // at loop-top regions.
 void IdealKit::goto_(Node* lab, bool bind) {
   Node* reg = lab->in(TypeFunc::Control);
   // find next empty slot in region
   uint slot = 1;
   while (slot < reg->req() && reg->in(slot) != NULL) slot++;
   assert(slot < reg->req(), "too many gotos");
   // If this is last predecessor, then don't force phi creation
   if (slot == reg->req() - 1) bind = false;
   reg->init_req(slot, ctrl());
   assert(first_var + _var_ct == _cvstate->req(), "bad _cvstate size");
   for (uint i = first_var; i < _cvstate->req(); i++) {
     // l is the value of var reaching the label. Could be a single value
     // reaching the label, or a phi that merges multiples values reaching
     // the label.  The latter is true if the label's input: in(..) is
     // a phi whose control input is the region node for the label.
     Node* l = lab->in(i);
     // Get the current value of the var
     Node* m = _cvstate->in(i);
     // If the var went unused no need for a phi
     if (m == NULL) {
       continue;
     } else if (l == NULL || m == l) {
       // Only one unique value "m" is known to reach this label so a phi
       // is not yet necessary unless:
       //    the label is being bound and all predecessors have not been seen,
       //    in which case "bind" will be true.
       if (bind) {
         m = promote_to_phi(m, reg);
       }
       // Record the phi/value used for this var in the label's cvstate
       lab->set_req(i, m);
     } else {
       // More than one value for the variable reaches this label so
       // a create a phi if one does not already exist.
       if (!was_promoted_to_phi(l, reg)) {
         l = promote_to_phi(l, reg);
         lab->set_req(i, l);
       }
       // Record in the phi, the var's value from the current state
       l->set_req(slot, m);
     }
   }
   do_memory_merge(_cvstate, lab);
   stop();
 }
 //-----------------------------promote_to_phi-----------------------------------
 Node* IdealKit::promote_to_phi(Node* n, Node* reg) {
   assert(!was_promoted_to_phi(n, reg), "n already promoted to phi on this region");
   // Get a conservative type for the phi
   const BasicType bt = n->bottom_type()->basic_type();
   const Type* ct = Type::get_const_basic_type(bt);
   return delay_transform(PhiNode::make(reg, n, ct));
 }
 //-----------------------------declares_done-----------------------------------
 void IdealKit::declares_done() {
   _cvstate = new_cvstate();   // initialize current cvstate
   set_ctrl(_initial_ctrl);    // initialize control in current cvstate
   set_all_memory(_initial_memory);// initialize memory in current cvstate
   DEBUG_ONLY(_state->push(BlockS));
 }
 //-----------------------------transform-----------------------------------
 Node* IdealKit::transform(Node* n) {
   if (_delay_all_transforms) {
     return delay_transform(n);
   } else {
     return gvn().transform(n);
   }
 }
 //-----------------------------delay_transform-----------------------------------
 Node* IdealKit::delay_transform(Node* n) {
   gvn().set_type(n, n->bottom_type());
   _delay_transform->push(n);
   return n;
 }
 //-----------------------------new_cvstate-----------------------------------
 Node* IdealKit::new_cvstate() {
   uint sz = _var_ct + first_var;
   return new (C, sz) Node(sz);
 }
 //-----------------------------copy_cvstate-----------------------------------
 Node* IdealKit::copy_cvstate() {
   Node* ns = new_cvstate();
   for (uint i = 0; i < ns->req(); i++) ns->init_req(i, _cvstate->in(i));
   // We must clone memory since it will be updated as we do stores.
   ns->set_req(TypeFunc::Memory, MergeMemNode::make(C, ns->in(TypeFunc::Memory)));
   return ns;
 }
 //-----------------------------clear-----------------------------------
 void IdealKit::clear(Node* m) {
   for (uint i = 0; i < m->req(); i++) m->set_req(i, NULL);
 }
 //-----------------------------drain_delay_transform----------------------------
 void IdealKit::drain_delay_transform() {
   while (_delay_transform->length() > 0) {
     Node* n = _delay_transform->pop();
     gvn().transform(n);
     if (!gvn().is_IterGVN()) {
       C->record_for_igvn(n);
     }
   }
 }
 //-----------------------------IdealVariable----------------------------
 IdealVariable::IdealVariable(IdealKit &k) {
   k.declare(this);
 }
 Node* IdealKit::memory(uint alias_idx) {
   MergeMemNode* mem = merged_memory();
   Node* p = mem->memory_at(alias_idx);
   _gvn.set_type(p, Type::MEMORY);  // must be mapped
   return p;
 }
 void IdealKit::set_memory(Node* mem, uint alias_idx) {
   merged_memory()->set_memory_at(alias_idx, mem);
 }
 //----------------------------- make_load ----------------------------
 Node* IdealKit::load(Node* ctl,
                      Node* adr,
                      const Type* t,
                      BasicType bt,
                      int adr_idx,
                      bool require_atomic_access) {
   assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" );
   const TypePtr* adr_type = NULL; // debug-mode-only argument
   debug_only(adr_type = C->get_adr_type(adr_idx));
   Node* mem = memory(adr_idx);
   Node* ld;
   if (require_atomic_access && bt == T_LONG) {
     ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t);
   } else {
     ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt);
   }
   return transform(ld);
 }
 Node* IdealKit::store(Node* ctl, Node* adr, Node *val, BasicType bt,
                                 int adr_idx,
                                 bool require_atomic_access) {
   assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" );
   const TypePtr* adr_type = NULL;
   debug_only(adr_type = C->get_adr_type(adr_idx));
   Node *mem = memory(adr_idx);
   Node* st;
   if (require_atomic_access && bt == T_LONG) {
     st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val);
   } else {
     st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt);
   }
   st = transform(st);
   set_memory(st, adr_idx);
   return st;
 }
 // Card mark store. Must be ordered so that it will come after the store of
 // the oop.
 Node* IdealKit::storeCM(Node* ctl, Node* adr, Node *val, Node* oop_store,
                         BasicType bt,
                         int adr_idx) {
   assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" );
   const TypePtr* adr_type = NULL;
   debug_only(adr_type = C->get_adr_type(adr_idx));
   Node *mem = memory(adr_idx);
   // Add required edge to oop_store, optimizer does not support precedence edges.
   // Convert required edge to precedence edge before allocation.
   Node* st = new (C, 5) StoreCMNode(ctl, mem, adr, adr_type, val, oop_store);
   st = transform(st);
   set_memory(st, adr_idx);
   return st;
 }
 //---------------------------- do_memory_merge --------------------------------
 // The memory from one merging cvstate needs to be merged with the memory for another
 // join cvstate. If the join cvstate doesn't have a merged memory yet then we
 // can just copy the state from the merging cvstate
 // Merge one slow path into the rest of memory.
 void IdealKit::do_memory_merge(Node* merging, Node* join) {
   // Get the region for the join state
   Node* join_region = join->in(TypeFunc::Control);
   assert(join_region != NULL, "join region must exist");
   if (join->in(TypeFunc::Memory) == NULL ) {
     join->set_req(TypeFunc::Memory,  merging->in(TypeFunc::Memory));
     return;
   }
   // The control flow for merging must have already been attached to the join region
   // we need its index for the phis.
   uint slot;
   for (slot = 1; slot < join_region->req() ; slot ++ ) {
     if (join_region->in(slot) == merging->in(TypeFunc::Control)) break;
   }
   assert(slot !=  join_region->req(), "edge must already exist");
   MergeMemNode* join_m    = join->in(TypeFunc::Memory)->as_MergeMem();
   MergeMemNode* merging_m = merging->in(TypeFunc::Memory)->as_MergeMem();
   // join_m should be an ancestor mergemem of merging
   // Slow path memory comes from the current map (which is from a slow call)
   // Fast path/null path memory comes from the call's input
   // Merge the other fast-memory inputs with the new slow-default memory.
   // for (MergeMemStream mms(merged_memory(), fast_mem->as_MergeMem()); mms.next_non_empty2(); ) {
   for (MergeMemStream mms(join_m, merging_m); mms.next_non_empty2(); ) {
     Node* join_slice = mms.force_memory();
     Node* merging_slice = mms.memory2();
     if (join_slice != merging_slice) {
       PhiNode* phi;
       // bool new_phi = false;
       // Is the phi for this slice one that we created for this join region or simply
       // one we copied? If it is ours then add
       if (join_slice->is_Phi() && join_slice->as_Phi()->region() == join_region) {
         phi = join_slice->as_Phi();
       } else {
         // create the phi with join_slice filling supplying memory for all of the
         // control edges to the join region
         phi = PhiNode::make(join_region, join_slice, Type::MEMORY, mms.adr_type(C));
         phi = (PhiNode*) delay_transform(phi);
         // gvn().set_type(phi, Type::MEMORY);
         // new_phi = true;
       }
       // Now update the phi with the slice for the merging slice
       phi->set_req(slot, merging_slice/* slow_path, slow_slice */);
       // this updates join_m with the phi
       mms.set_memory(phi);
     }
   }
 }
 //----------------------------- make_call  ----------------------------
 // Trivial runtime call
 void IdealKit::make_leaf_call(const TypeFunc *slow_call_type,
                               address slow_call,
                               const char *leaf_name,
                               Node* parm0,
                               Node* parm1,
                               Node* parm2) {
   // We only handle taking in RawMem and modifying RawMem
   const TypePtr* adr_type = TypeRawPtr::BOTTOM;
   uint adr_idx = C->get_alias_index(adr_type);
   // Clone initial memory
   MergeMemNode* cloned_mem =  MergeMemNode::make(C, merged_memory());
   // Slow-path leaf call
   int size = slow_call_type->domain()->cnt();
   CallNode *call =  (CallNode*)new (C, size) CallLeafNode( slow_call_type, slow_call, leaf_name, adr_type);
   // Set fixed predefined input arguments
   call->init_req( TypeFunc::Control, ctrl() );
   call->init_req( TypeFunc::I_O    , top() )     ;   // does no i/o
   // Narrow memory as only memory input
   call->init_req( TypeFunc::Memory , memory(adr_idx));
   call->init_req( TypeFunc::FramePtr, top() /* frameptr() */ );
   call->init_req( TypeFunc::ReturnAdr, top() );
   if (parm0 != NULL)  call->init_req(TypeFunc::Parms+0, parm0);
   if (parm1 != NULL)  call->init_req(TypeFunc::Parms+1, parm1);
   if (parm2 != NULL)  call->init_req(TypeFunc::Parms+2, parm2);
   // Node *c = _gvn.transform(call);
   call = (CallNode *) _gvn.transform(call);
   Node *c = call; // dbx gets confused with call call->dump()
   // Slow leaf call has no side-effects, sets few values
   set_ctrl(transform( new (C, 1) ProjNode(call,TypeFunc::Control) ));
   // Set the incoming clone of memory as current memory
   set_all_memory(cloned_mem);
   // Make memory for the call
   Node* mem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) );
   // Set the RawPtr memory state only.
   set_memory(mem, adr_idx);
   assert(C->alias_type(call->adr_type()) == C->alias_type(adr_type),
          "call node must be constructed correctly");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/idealKit.cpp@98cb887364d3 (annotated)

src/share/vm/opto/idealKit.cpp