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/*

 * Copyright © 2010 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.

 */

/**

 * \file opt_function_inlining.cpp

 *

 * Replaces calls to functions with the body of the function.

 */

#include "ir.h"

#include "ir_visitor.h"

#include "ir_function_inlining.h"

#include "ir_expression_flattening.h"

#include "glsl_types.h"

#include "program/hash_table.h"

static void

do_sampler_replacement(exec_list *instructions,

		       ir_variable *sampler,

		       ir_dereference *deref);

namespace {

class ir_function_inlining_visitor : public ir_hierarchical_visitor {

public:

   ir_function_inlining_visitor()

   {

      progress = false;

   }

   virtual ~ir_function_inlining_visitor()

   {

      /* empty */

   }

   virtual ir_visitor_status visit_enter(ir_expression *);

   virtual ir_visitor_status visit_enter(ir_call *);

   virtual ir_visitor_status visit_enter(ir_return *);

   virtual ir_visitor_status visit_enter(ir_texture *);

   virtual ir_visitor_status visit_enter(ir_swizzle *);

   bool progress;

};

} /* unnamed namespace */

bool

do_function_inlining(exec_list *instructions)

{

   ir_function_inlining_visitor v;

   v.run(instructions);

   return v.progress;

}

static void

replace_return_with_assignment(ir_instruction *ir, void *data)

{

   void *ctx = ralloc_parent(ir);

   ir_dereference *orig_deref = (ir_dereference *) data;

   ir_return *ret = ir->as_return();

   if (ret) {

      if (ret->value) {

	 ir_rvalue *lhs = orig_deref->clone(ctx, NULL);

	 ret->replace_with(new(ctx) ir_assignment(lhs, ret->value, NULL));

      } else {

	 /* un-valued return has to be the last return, or we shouldn't

	  * have reached here. (see can_inline()).

	  */

	 assert(ret->next->is_tail_sentinel());

	 ret->remove();

      }

   }

}

void

ir_call::generate_inline(ir_instruction *next_ir)

{

   void *ctx = ralloc_parent(this);

   ir_variable **parameters;

   int num_parameters;

   int i;

   struct hash_table *ht;

   ht = hash_table_ctor(0, hash_table_pointer_hash, hash_table_pointer_compare);

   num_parameters = 0;

   foreach_iter(exec_list_iterator, iter_sig, this->callee->parameters)

      num_parameters++;

   parameters = new ir_variable *[num_parameters];

   /* Generate the declarations for the parameters to our inlined code,

    * and set up the mapping of real function body variables to ours.

    */

   i = 0;

   exec_list_iterator sig_param_iter = this->callee->parameters.iterator();

   exec_list_iterator param_iter = this->actual_parameters.iterator();

   for (i = 0; i < num_parameters; i++) {

      ir_variable *sig_param = (ir_variable *) sig_param_iter.get();

      ir_rvalue *param = (ir_rvalue *) param_iter.get();

      /* Generate a new variable for the parameter. */

      if (sig_param->type->base_type == GLSL_TYPE_SAMPLER) {

	 /* For samplers, we want the inlined sampler references

	  * referencing the passed in sampler variable, since that

	  * will have the location information, which an assignment of

	  * a sampler wouldn't.  Fix it up below.

	  */

	 parameters[i] = NULL;

      } else {

	 parameters[i] = sig_param->clone(ctx, ht);

	 parameters[i]->mode = ir_var_auto;

	 /* Remove the read-only decoration becuase we're going to write

	  * directly to this variable.  If the cloned variable is left

	  * read-only and the inlined function is inside a loop, the loop

	  * analysis code will get confused.

	  */

	 parameters[i]->read_only = false;

	 next_ir->insert_before(parameters[i]);

      }

      /* Move the actual param into our param variable if it's an 'in' type. */

      if (parameters[i] && (sig_param->mode == ir_var_function_in ||

			    sig_param->mode == ir_var_const_in ||

			    sig_param->mode == ir_var_function_inout)) {

	 ir_assignment *assign;

	 assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(parameters[i]),

					 param, NULL);

	 next_ir->insert_before(assign);

      }

      sig_param_iter.next();

      param_iter.next();

   }

   exec_list new_instructions;

   /* Generate the inlined body of the function to a new list */

   foreach_iter(exec_list_iterator, iter, callee->body) {

      ir_instruction *ir = (ir_instruction *)iter.get();

      ir_instruction *new_ir = ir->clone(ctx, ht);

      new_instructions.push_tail(new_ir);

      visit_tree(new_ir, replace_return_with_assignment, this->return_deref);

   }

   /* If any samplers were passed in, replace any deref of the sampler

    * with a deref of the sampler argument.

    */

   param_iter = this->actual_parameters.iterator();

   sig_param_iter = this->callee->parameters.iterator();

   for (i = 0; i < num_parameters; i++) {

      ir_instruction *const param = (ir_instruction *) param_iter.get();

      ir_variable *sig_param = (ir_variable *) sig_param_iter.get();

      if (sig_param->type->base_type == GLSL_TYPE_SAMPLER) {

	 ir_dereference *deref = param->as_dereference();

	 assert(deref);

	 do_sampler_replacement(&new_instructions, sig_param, deref);

      }

      param_iter.next();

      sig_param_iter.next();

   }

   /* Now push those new instructions in. */

   next_ir->insert_before(&new_instructions);

   /* Copy back the value of any 'out' parameters from the function body

    * variables to our own.

    */

   i = 0;

   param_iter = this->actual_parameters.iterator();

   sig_param_iter = this->callee->parameters.iterator();

   for (i = 0; i < num_parameters; i++) {

      ir_instruction *const param = (ir_instruction *) param_iter.get();

      const ir_variable *const sig_param = (ir_variable *) sig_param_iter.get();

      /* Move our param variable into the actual param if it's an 'out' type. */

      if (parameters[i] && (sig_param->mode == ir_var_function_out ||

			    sig_param->mode == ir_var_function_inout)) {

	 ir_assignment *assign;

	 assign = new(ctx) ir_assignment(param->clone(ctx, NULL)->as_rvalue(),

					 new(ctx) ir_dereference_variable(parameters[i]),

					 NULL);

	 next_ir->insert_before(assign);

      }

      param_iter.next();

      sig_param_iter.next();

   }

   delete [] parameters;

   hash_table_dtor(ht);

}

ir_visitor_status

ir_function_inlining_visitor::visit_enter(ir_expression *ir)

{

   (void) ir;

   return visit_continue_with_parent;

}

ir_visitor_status

ir_function_inlining_visitor::visit_enter(ir_return *ir)

{

   (void) ir;

   return visit_continue_with_parent;

}

ir_visitor_status

ir_function_inlining_visitor::visit_enter(ir_texture *ir)

{

   (void) ir;

   return visit_continue_with_parent;

}

ir_visitor_status

ir_function_inlining_visitor::visit_enter(ir_swizzle *ir)

{

   (void) ir;

   return visit_continue_with_parent;

}

ir_visitor_status

ir_function_inlining_visitor::visit_enter(ir_call *ir)

{

   if (can_inline(ir)) {

      ir->generate_inline(ir);

      ir->remove();

      this->progress = true;

   }

   return visit_continue;

}

/**

 * Replaces references to the "sampler" variable with a clone of "deref."

 *

 * From the spec, samplers can appear in the tree as function

 * (non-out) parameters and as the result of array indexing and

 * structure field selection.  In our builtin implementation, they

 * also appear in the sampler field of an ir_tex instruction.

 */

class ir_sampler_replacement_visitor : public ir_hierarchical_visitor {

public:

   ir_sampler_replacement_visitor(ir_variable *sampler, ir_dereference *deref)

   {

      this->sampler = sampler;

      this->deref = deref;

   }

   virtual ~ir_sampler_replacement_visitor()

   {

   }

   virtual ir_visitor_status visit_leave(ir_call *);

   virtual ir_visitor_status visit_leave(ir_dereference_array *);

   virtual ir_visitor_status visit_leave(ir_dereference_record *);

   virtual ir_visitor_status visit_leave(ir_texture *);

   void replace_deref(ir_dereference **deref);

   void replace_rvalue(ir_rvalue **rvalue);

   ir_variable *sampler;

   ir_dereference *deref;

};

void

ir_sampler_replacement_visitor::replace_deref(ir_dereference **deref)

{

   ir_dereference_variable *deref_var = (*deref)->as_dereference_variable();

   if (deref_var && deref_var->var == this->sampler) {

      *deref = this->deref->clone(ralloc_parent(*deref), NULL);

   }

}

void

ir_sampler_replacement_visitor::replace_rvalue(ir_rvalue **rvalue)

{

   if (!*rvalue)

      return;

   ir_dereference *deref = (*rvalue)->as_dereference();

   if (!deref)

      return;

   replace_deref(&deref);

   *rvalue = deref;

}

ir_visitor_status

ir_sampler_replacement_visitor::visit_leave(ir_texture *ir)

{

   replace_deref(&ir->sampler);

   return visit_continue;

}

ir_visitor_status

ir_sampler_replacement_visitor::visit_leave(ir_dereference_array *ir)

{

   replace_rvalue(&ir->array);

   return visit_continue;

}

ir_visitor_status

ir_sampler_replacement_visitor::visit_leave(ir_dereference_record *ir)

{

   replace_rvalue(&ir->record);

   return visit_continue;

}

ir_visitor_status

ir_sampler_replacement_visitor::visit_leave(ir_call *ir)

{

   foreach_iter(exec_list_iterator, iter, *ir) {

      ir_rvalue *param = (ir_rvalue *)iter.get();

      ir_rvalue *new_param = param;

      replace_rvalue(&new_param);

      if (new_param != param) {

	 param->replace_with(new_param);

      }

   }

   return visit_continue;

}

static void

do_sampler_replacement(exec_list *instructions,

		       ir_variable *sampler,

		       ir_dereference *deref)

{

   ir_sampler_replacement_visitor v(sampler, deref);

   visit_list_elements(&v, instructions);

}