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 /*

  * Copyright (c) 2000, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #ifndef SHARE_VM_OPTO_OUTPUT_HPP

 #define SHARE_VM_OPTO_OUTPUT_HPP

 #include "opto/block.hpp"

 #include "opto/node.hpp"

 #if defined AD_MD_HPP

 # include AD_MD_HPP

 #elif defined TARGET_ARCH_MODEL_x86_32

 # include "adfiles/ad_x86_32.hpp"

 #elif defined TARGET_ARCH_MODEL_x86_64

 # include "adfiles/ad_x86_64.hpp"

 #elif defined TARGET_ARCH_MODEL_sparc

 # include "adfiles/ad_sparc.hpp"

 #elif defined TARGET_ARCH_MODEL_zero

 # include "adfiles/ad_zero.hpp"

 #elif defined TARGET_ARCH_MODEL_ppc_64

 # include "adfiles/ad_ppc_64.hpp"

 #endif

 class Arena;

 class Bundle;

 class Block;

 class Block_Array;

 class Node;

 class Node_Array;

 class Node_List;

 class PhaseCFG;

 class PhaseChaitin;

 class Pipeline_Use_Element;

 class Pipeline_Use;

 #ifndef PRODUCT

 #define DEBUG_ARG(x) , x

 #else

 #define DEBUG_ARG(x)

 #endif

 // Define the initial sizes for allocation of the resizable code buffer

 enum {

   initial_code_capacity  =  16 * 1024,

   initial_stub_capacity  =   4 * 1024,

   initial_const_capacity =   4 * 1024,

   initial_locs_capacity  =   3 * 1024

 };

 //------------------------------Scheduling----------------------------------

 // This class contains all the information necessary to implement instruction

 // scheduling and bundling.

 class Scheduling {

 private:

   // Arena to use

   Arena *_arena;

   // Control-Flow Graph info

   PhaseCFG *_cfg;

   // Register Allocation info

   PhaseRegAlloc *_regalloc;

   // Number of nodes in the method

   uint _node_bundling_limit;

   // List of scheduled nodes. Generated in reverse order

   Node_List _scheduled;

   // List of nodes currently available for choosing for scheduling

   Node_List _available;

   // For each instruction beginning a bundle, the number of following

   // nodes to be bundled with it.

   Bundle *_node_bundling_base;

   // Mapping from register to Node

   Node_List _reg_node;

   // Free list for pinch nodes.

   Node_List _pinch_free_list;

   // Latency from the beginning of the containing basic block (base 1)

   // for each node.

   unsigned short *_node_latency;

   // Number of uses of this node within the containing basic block.

   short *_uses;

   // Schedulable portion of current block.  Skips Region/Phi/CreateEx up

   // front, branch+proj at end.  Also skips Catch/CProj (same as

   // branch-at-end), plus just-prior exception-throwing call.

   uint _bb_start, _bb_end;

   // Latency from the end of the basic block as scheduled

   unsigned short *_current_latency;

   // Remember the next node

   Node *_next_node;

   // Use this for an unconditional branch delay slot

   Node *_unconditional_delay_slot;

   // Pointer to a Nop

   MachNopNode *_nop;

   // Length of the current bundle, in instructions

   uint _bundle_instr_count;

   // Current Cycle number, for computing latencies and bundling

   uint _bundle_cycle_number;

   // Bundle information

   Pipeline_Use_Element _bundle_use_elements[resource_count];

   Pipeline_Use         _bundle_use;

   // Dump the available list

   void dump_available() const;

 public:

   Scheduling(Arena *arena, Compile &compile);

   // Destructor

   NOT_PRODUCT( ~Scheduling(); )

   // Step ahead "i" cycles

   void step(uint i);

   // Step ahead 1 cycle, and clear the bundle state (for example,

   // at a branch target)

   void step_and_clear();

   Bundle* node_bundling(const Node *n) {

     assert(valid_bundle_info(n), "oob");

     return (&_node_bundling_base[n->_idx]);

   }

   bool valid_bundle_info(const Node *n) const {

     return (_node_bundling_limit > n->_idx);

   }

   bool starts_bundle(const Node *n) const {

     return (_node_bundling_limit > n->_idx && _node_bundling_base[n->_idx].starts_bundle());

   }

   // Do the scheduling

   void DoScheduling();

   // Compute the local latencies walking forward over the list of

   // nodes for a basic block

   void ComputeLocalLatenciesForward(const Block *bb);

   // Compute the register antidependencies within a basic block

   void ComputeRegisterAntidependencies(Block *bb);

   void verify_do_def( Node *n, OptoReg::Name def, const char *msg );

   void verify_good_schedule( Block *b, const char *msg );

   void anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def );

   void anti_do_use( Block *b, Node *use, OptoReg::Name use_reg );

   // Add a node to the current bundle

   void AddNodeToBundle(Node *n, const Block *bb);

   // Add a node to the list of available nodes

   void AddNodeToAvailableList(Node *n);

   // Compute the local use count for the nodes in a block, and compute

   // the list of instructions with no uses in the block as available

   void ComputeUseCount(const Block *bb);

   // Choose an instruction from the available list to add to the bundle

   Node * ChooseNodeToBundle();

   // See if this Node fits into the currently accumulating bundle

   bool NodeFitsInBundle(Node *n);

   // Decrement the use count for a node

  void DecrementUseCounts(Node *n, const Block *bb);

   // Garbage collect pinch nodes for reuse by other blocks.

   void garbage_collect_pinch_nodes();

   // Clean up a pinch node for reuse (helper for above).

   void cleanup_pinch( Node *pinch );

   // Information for statistics gathering

 #ifndef PRODUCT

 private:

   // Gather information on size of nops relative to total

   uint _branches, _unconditional_delays;

   static uint _total_nop_size, _total_method_size;

   static uint _total_branches, _total_unconditional_delays;

   static uint _total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];

 public:

   static void print_statistics();

   static void increment_instructions_per_bundle(uint i) {

     _total_instructions_per_bundle[i]++;

   }

   static void increment_nop_size(uint s) {

     _total_nop_size += s;

   }

   static void increment_method_size(uint s) {

     _total_method_size += s;

   }

 #endif

 };

 #endif // SHARE_VM_OPTO_OUTPUT_HPP