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/* -*- c++ -*- */

/*

 * 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.

 */

#include "glsl_symbol_table.h"

class symbol_table_entry {

public:

   DECLARE_RALLOC_CXX_OPERATORS(symbol_table_entry);

   bool add_interface(const glsl_type *i, enum ir_variable_mode mode)

   {

      const glsl_type **dest;

      switch (mode) {

      case ir_var_uniform:

         dest = &ibu;

         break;

      case ir_var_shader_in:

         dest = &ibi;

         break;

      case ir_var_shader_out:

         dest = &ibo;

         break;

      default:

         assert(!"Unsupported interface variable mode!");

         return false;

      }

      if (*dest != NULL) {

         return false;

      } else {

         *dest = i;

         return true;

      }

   }

   const glsl_type *get_interface(enum ir_variable_mode mode)

   {

      switch (mode) {

      case ir_var_uniform:

         return ibu;

      case ir_var_shader_in:

         return ibi;

      case ir_var_shader_out:

         return ibo;

      default:

         assert(!"Unsupported interface variable mode!");

         return NULL;

      }

   }

   symbol_table_entry(ir_variable *v)               :

      v(v), f(0), t(0), ibu(0), ibi(0), ibo(0), a(0) {}

   symbol_table_entry(ir_function *f)               :

      v(0), f(f), t(0), ibu(0), ibi(0), ibo(0), a(0) {}

   symbol_table_entry(const glsl_type *t)           :

      v(0), f(0), t(t), ibu(0), ibi(0), ibo(0), a(0) {}

   symbol_table_entry(const glsl_type *t, enum ir_variable_mode mode) :

      v(0), f(0), t(0), ibu(0), ibi(0), ibo(0), a(0)

   {

      assert(t->is_interface());

      add_interface(t, mode);

   }

   symbol_table_entry(const class ast_type_specifier *a):

      v(0), f(0), t(0), ibu(0), ibi(0), ibo(0), a(a) {}

   ir_variable *v;

   ir_function *f;

   const glsl_type *t;

   const glsl_type *ibu;

   const glsl_type *ibi;

   const glsl_type *ibo;

   const class ast_type_specifier *a;

};

glsl_symbol_table::glsl_symbol_table()

{

   this->separate_function_namespace = false;

   this->table = _mesa_symbol_table_ctor();

   this->mem_ctx = ralloc_context(NULL);

}

glsl_symbol_table::~glsl_symbol_table()

{

   _mesa_symbol_table_dtor(table);

   ralloc_free(mem_ctx);

}

void glsl_symbol_table::push_scope()

{

   _mesa_symbol_table_push_scope(table);

}

void glsl_symbol_table::pop_scope()

{

   _mesa_symbol_table_pop_scope(table);

}

bool glsl_symbol_table::name_declared_this_scope(const char *name)

{

   return _mesa_symbol_table_symbol_scope(table, -1, name) == 0;

}

bool glsl_symbol_table::add_variable(ir_variable *v)

{

   assert(v->data.mode != ir_var_temporary);

   if (this->separate_function_namespace) {

      /* In 1.10, functions and variables have separate namespaces. */

      symbol_table_entry *existing = get_entry(v->name);

      if (name_declared_this_scope(v->name)) {

	 /* If there's already an existing function (not a constructor!) in

	  * the current scope, just update the existing entry to include 'v'.

	  */

	 if (existing->v == NULL && existing->t == NULL) {

	    existing->v = v;

	    return true;

	 }

      } else {

	 /* If not declared at this scope, add a new entry.  But if an existing

	  * entry includes a function, propagate that to this block - otherwise

	  * the new variable declaration would shadow the function.

	  */

	 symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v);

	 if (existing != NULL)

	    entry->f = existing->f;

	 int added = _mesa_symbol_table_add_symbol(table, -1, v->name, entry);

	 assert(added == 0);

	 (void)added;

	 return true;

      }

      return false;

   }

   /* 1.20+ rules: */

   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v);

   return _mesa_symbol_table_add_symbol(table, -1, v->name, entry) == 0;

}

bool glsl_symbol_table::add_type(const char *name, const glsl_type *t)

{

   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(t);

   return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;

}

bool glsl_symbol_table::add_interface(const char *name, const glsl_type *i,

                                      enum ir_variable_mode mode)

{

   assert(i->is_interface());

   symbol_table_entry *entry = get_entry(name);

   if (entry == NULL) {

      symbol_table_entry *entry =

         new(mem_ctx) symbol_table_entry(i, mode);

      bool add_interface_symbol_result =

         _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;

      assert(add_interface_symbol_result);

      return add_interface_symbol_result;

   } else {

      return entry->add_interface(i, mode);

   }

}

bool glsl_symbol_table::add_function(ir_function *f)

{

   if (this->separate_function_namespace && name_declared_this_scope(f->name)) {

      /* In 1.10, functions and variables have separate namespaces. */

      symbol_table_entry *existing = get_entry(f->name);

      if ((existing->f == NULL) && (existing->t == NULL)) {

	 existing->f = f;

	 return true;

      }

   }

   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f);

   return _mesa_symbol_table_add_symbol(table, -1, f->name, entry) == 0;

}

void glsl_symbol_table::add_global_function(ir_function *f)

{

   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f);

   int added = _mesa_symbol_table_add_global_symbol(table, -1, f->name, entry);

   assert(added == 0);

   (void)added;

}

ir_variable *glsl_symbol_table::get_variable(const char *name)

{

   symbol_table_entry *entry = get_entry(name);

   return entry != NULL ? entry->v : NULL;

}

const glsl_type *glsl_symbol_table::get_type(const char *name)

{

   symbol_table_entry *entry = get_entry(name);

   return entry != NULL ? entry->t : NULL;

}

const glsl_type *glsl_symbol_table::get_interface(const char *name,

                                                  enum ir_variable_mode mode)

{

   symbol_table_entry *entry = get_entry(name);

   return entry != NULL ? entry->get_interface(mode) : NULL;

}

ir_function *glsl_symbol_table::get_function(const char *name)

{

   symbol_table_entry *entry = get_entry(name);

   return entry != NULL ? entry->f : NULL;

}

symbol_table_entry *glsl_symbol_table::get_entry(const char *name)

{

   return (symbol_table_entry *)

      _mesa_symbol_table_find_symbol(table, -1, name);

}

void

glsl_symbol_table::disable_variable(const char *name)

{

   /* Ideally we would remove the variable's entry from the symbol table, but

    * that would be difficult.  Fortunately, since this is only used for

    * built-in variables, it won't be possible for the shader to re-introduce

    * the variable later, so all we really need to do is to make sure that

    * further attempts to access it using get_variable() will return NULL.

    */

   symbol_table_entry *entry = get_entry(name);

   if (entry != NULL) {

      entry->v = NULL;

   }

}