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/*

 * Copyright © 2012 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 *

 * Authors:

 *    Eric Anholt 

 *

 */

#pragma once

#ifndef BRW_CFG_H

#define BRW_CFG_H

#include "brw_shader.h"

struct bblock_t;

struct bblock_link {

#ifdef __cplusplus

   DECLARE_RALLOC_CXX_OPERATORS(bblock_link)

   bblock_link(bblock_t *block)

      : block(block)

   {

   }

#endif

   struct exec_node link;

   struct bblock_t *block;

};

struct backend_instruction;

struct bblock_t {

#ifdef __cplusplus

   DECLARE_RALLOC_CXX_OPERATORS(bblock_t)

   explicit bblock_t(cfg_t *cfg);

   void add_successor(void *mem_ctx, bblock_t *successor);

   bool is_predecessor_of(const bblock_t *block) const;

   bool is_successor_of(const bblock_t *block) const;

   bool can_combine_with(const bblock_t *that) const;

   void combine_with(bblock_t *that);

   void dump(backend_visitor *v) const;

   backend_instruction *start();

   const backend_instruction *start() const;

   backend_instruction *end();

   const backend_instruction *end() const;

   bblock_t *next();

   const bblock_t *next() const;

   bblock_t *prev();

   const bblock_t *prev() const;

   bool starts_with_control_flow() const;

   bool ends_with_control_flow() const;

   backend_instruction *first_non_control_flow_inst();

   backend_instruction *last_non_control_flow_inst();

#endif

   struct exec_node link;

   struct cfg_t *cfg;

   struct bblock_t *idom;

   int start_ip;

   int end_ip;

   struct exec_list instructions;

   struct exec_list parents;

   struct exec_list children;

   int num;

};

static inline struct backend_instruction *

bblock_start(struct bblock_t *block)

{

   return (struct backend_instruction *)exec_list_get_head(&block->instructions);

}

static inline const struct backend_instruction *

bblock_start_const(const struct bblock_t *block)

{

   return (const struct backend_instruction *)exec_list_get_head_const(&block->instructions);

}

static inline struct backend_instruction *

bblock_end(struct bblock_t *block)

{

   return (struct backend_instruction *)exec_list_get_tail(&block->instructions);

}

static inline const struct backend_instruction *

bblock_end_const(const struct bblock_t *block)

{

   return (const struct backend_instruction *)exec_list_get_tail_const(&block->instructions);

}

static inline struct bblock_t *

bblock_next(struct bblock_t *block)

{

   return (struct bblock_t *)block->link.next;

}

static inline const struct bblock_t *

bblock_next_const(const struct bblock_t *block)

{

   return (const struct bblock_t *)block->link.next;

}

static inline struct bblock_t *

bblock_prev(struct bblock_t *block)

{

   return (struct bblock_t *)block->link.prev;

}

static inline const struct bblock_t *

bblock_prev_const(const struct bblock_t *block)

{

   return (const struct bblock_t *)block->link.prev;

}

static inline bool

bblock_starts_with_control_flow(const struct bblock_t *block)

{

   enum opcode op = bblock_start_const(block)->opcode;

   return op == BRW_OPCODE_DO || op == BRW_OPCODE_ENDIF;

}

static inline bool

bblock_ends_with_control_flow(const struct bblock_t *block)

{

   enum opcode op = bblock_end_const(block)->opcode;

   return op == BRW_OPCODE_IF ||

          op == BRW_OPCODE_ELSE ||

          op == BRW_OPCODE_WHILE ||

          op == BRW_OPCODE_BREAK ||

          op == BRW_OPCODE_CONTINUE;

}

static inline struct backend_instruction *

bblock_first_non_control_flow_inst(struct bblock_t *block)

{

   struct backend_instruction *inst = bblock_start(block);

   if (bblock_starts_with_control_flow(block))

#ifdef __cplusplus

      inst = (struct backend_instruction *)inst->next;

#else

      inst = (struct backend_instruction *)inst->link.next;

#endif

   return inst;

}

static inline struct backend_instruction *

bblock_last_non_control_flow_inst(struct bblock_t *block)

{

   struct backend_instruction *inst = bblock_end(block);

   if (bblock_ends_with_control_flow(block))

#ifdef __cplusplus

      inst = (struct backend_instruction *)inst->prev;

#else

      inst = (struct backend_instruction *)inst->link.prev;

#endif

   return inst;

}

#ifdef __cplusplus

inline backend_instruction *

bblock_t::start()

{

   return bblock_start(this);

}

inline const backend_instruction *

bblock_t::start() const

{

   return bblock_start_const(this);

}

inline backend_instruction *

bblock_t::end()

{

   return bblock_end(this);

}

inline const backend_instruction *

bblock_t::end() const

{

   return bblock_end_const(this);

}

inline bblock_t *

bblock_t::next()

{

   return bblock_next(this);

}

inline const bblock_t *

bblock_t::next() const

{

   return bblock_next_const(this);

}

inline bblock_t *

bblock_t::prev()

{

   return bblock_prev(this);

}

inline const bblock_t *

bblock_t::prev() const

{

   return bblock_prev_const(this);

}

inline bool

bblock_t::starts_with_control_flow() const

{

   return bblock_starts_with_control_flow(this);

}

inline bool

bblock_t::ends_with_control_flow() const

{

   return bblock_ends_with_control_flow(this);

}

inline backend_instruction *

bblock_t::first_non_control_flow_inst()

{

   return bblock_first_non_control_flow_inst(this);

}

inline backend_instruction *

bblock_t::last_non_control_flow_inst()

{

   return bblock_last_non_control_flow_inst(this);

}

#endif

struct cfg_t {

#ifdef __cplusplus

   DECLARE_RALLOC_CXX_OPERATORS(cfg_t)

   cfg_t(exec_list *instructions);

   ~cfg_t();

   void remove_block(bblock_t *block);

   bblock_t *new_block();

   void set_next_block(bblock_t **cur, bblock_t *block, int ip);

   void make_block_array();

   void calculate_idom();

   static bblock_t *intersect(bblock_t *b1, bblock_t *b2);

   void dump(backend_visitor *v);

   void dump_cfg();

   void dump_domtree();

#endif

   void *mem_ctx;

   /** Ordered list (by ip) of basic blocks */

   struct exec_list block_list;

   struct bblock_t **blocks;

   int num_blocks;

   bool idom_dirty;

};

/* Note that this is implemented with a double for loop -- break will

 * break from the inner loop only!

 */

#define foreach_block_and_inst(__block, __type, __inst, __cfg) \

   foreach_block (__block, __cfg)                              \

      foreach_inst_in_block (__type, __inst, __block)

/* Note that this is implemented with a double for loop -- break will

 * break from the inner loop only!

 */

#define foreach_block_and_inst_safe(__block, __type, __inst, __cfg) \

   foreach_block_safe (__block, __cfg)                              \

      foreach_inst_in_block_safe (__type, __inst, __block)

#define foreach_block(__block, __cfg)                          \

   foreach_list_typed (bblock_t, __block, link, &(__cfg)->block_list)

#define foreach_block_reverse(__block, __cfg)                  \

   foreach_list_typed_reverse (bblock_t, __block, link, &(__cfg)->block_list)

#define foreach_block_safe(__block, __cfg)                     \

   foreach_list_typed_safe (bblock_t, __block, link, &(__cfg)->block_list)

#define foreach_inst_in_block(__type, __inst, __block)         \

   foreach_in_list(__type, __inst, &(__block)->instructions)

#define foreach_inst_in_block_safe(__type, __inst, __block)    \

   for (__type *__inst = (__type *)__block->instructions.head, \

               *__next = (__type *)__inst->next,               \

               *__end = (__type *)__block->instructions.tail;  \

        __next != __end;                                       \

        __inst = __next,                                       \

        __next = (__type *)__next->next)

#define foreach_inst_in_block_reverse(__type, __inst, __block) \

   foreach_in_list_reverse(__type, __inst, &(__block)->instructions)

#define foreach_inst_in_block_reverse_safe(__type, __inst, __block) \

   foreach_in_list_reverse_safe(__type, __inst, &(__block)->instructions)

#define foreach_inst_in_block_starting_from(__type, __scan_inst, __inst, __block) \

   for (__type *__scan_inst = (__type *)__inst->next;          \

        !__scan_inst->is_tail_sentinel();                      \

        __scan_inst = (__type *)__scan_inst->next)

#define foreach_inst_in_block_reverse_starting_from(__type, __scan_inst, __inst, __block) \

   for (__type *__scan_inst = (__type *)__inst->prev;          \

        !__scan_inst->is_head_sentinel();                      \

        __scan_inst = (__type *)__scan_inst->prev)

#endif /* BRW_CFG_H */