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  1. /*
  2.  * Copyright © 2010 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  */
  23.  
  24. /**
  25.  * \file ir_import_prototypes.cpp
  26.  * Import function prototypes from one IR tree into another.
  27.  *
  28.  * \author Ian Romanick
  29.  */
  30. #include <stdio.h>
  31. #include "ir.h"
  32. #include "glsl_symbol_table.h"
  33.  
  34. /**
  35.  * Visitor used to import function prototypes
  36.  *
  37.  * Normally the \c clone method of either \c ir_function or
  38.  * \c ir_function_signature could be used.  However, we don't want a complete
  39.  * clone of the \c ir_function_signature.  We want everything \b except the
  40.  * body of the function.
  41.  */
  42. class import_prototype_visitor : public ir_hierarchical_visitor {
  43. public:
  44.    /**
  45.     */
  46.    import_prototype_visitor(exec_list *list, glsl_symbol_table *symbols,
  47.                             void *mem_ctx)
  48.    {
  49.       this->mem_ctx = mem_ctx;
  50.       this->list = list;
  51.       this->symbols = symbols;
  52.       this->function = NULL;
  53.    }
  54.  
  55.    virtual ir_visitor_status visit_enter(ir_function *ir)
  56.    {
  57.       assert(this->function == NULL);
  58.  
  59.       this->function = this->symbols->get_function(ir->name);
  60.       if (!this->function) {
  61.          this->function = new(this->mem_ctx) ir_function(ir->name);
  62.  
  63.          list->push_tail(this->function);
  64.  
  65.          /* Add the new function to the symbol table.
  66.           */
  67.          this->symbols->add_function(this->function);
  68.       }
  69.       return visit_continue;
  70.    }
  71.  
  72.    virtual ir_visitor_status visit_leave(ir_function *ir)
  73.    {
  74.       (void) ir;
  75.       assert(this->function != NULL);
  76.  
  77.       this->function = NULL;
  78.       return visit_continue;
  79.    }
  80.  
  81.    ir_visitor_status visit_enter(ir_function_signature *ir)
  82.    {
  83.       assert(this->function != NULL);
  84.  
  85.       ir_function_signature *copy = ir->clone_prototype(mem_ctx, NULL);
  86.  
  87.       this->function->add_signature(copy);
  88.  
  89.       /* Do not process child nodes of the ir_function_signature.  There can
  90.        * never be any nodes inside the ir_function_signature that we care
  91.        * about.  Instead continue with the next sibling.
  92.        */
  93.       return visit_continue_with_parent;
  94.    }
  95.  
  96. private:
  97.    exec_list *list;
  98.    ir_function *function;
  99.    glsl_symbol_table *symbols;
  100.    void *mem_ctx;
  101. };
  102.  
  103.  
  104. /**
  105.  * Import function prototypes from one IR tree into another
  106.  *
  107.  * \param source   Source instruction stream containing functions whose
  108.  *                 prototypes are to be imported
  109.  * \param dest     Destination instruction stream where new \c ir_function and
  110.  *                 \c ir_function_signature nodes will be stored
  111.  * \param symbols  Symbol table where new functions will be stored
  112.  * \param mem_ctx  ralloc memory context used for new allocations
  113.  */
  114. void
  115. import_prototypes(const exec_list *source, exec_list *dest,
  116.                   glsl_symbol_table *symbols, void *mem_ctx)
  117. {
  118.    import_prototype_visitor v(dest, symbols, mem_ctx);
  119.  
  120.    /* Making source be const is just extra documentation.
  121.     */
  122.    v.run(const_cast<exec_list *>(source));
  123. }
  124.