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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 "ir.h"
  31. #include "glsl_symbol_table.h"
  32.  
  33. /**
  34.  * Visitor used to import function prototypes
  35.  *
  36.  * Normally the \c clone method of either \c ir_function or
  37.  * \c ir_function_signature could be used.  However, we don't want a complete
  38.  * clone of the \c ir_function_signature.  We want everything \b except the
  39.  * body of the function.
  40.  */
  41. class import_prototype_visitor : public ir_hierarchical_visitor {
  42. public:
  43.    /**
  44.     */
  45.    import_prototype_visitor(exec_list *list, glsl_symbol_table *symbols,
  46.                             void *mem_ctx)
  47.    {
  48.       this->mem_ctx = mem_ctx;
  49.       this->list = list;
  50.       this->symbols = symbols;
  51.       this->function = NULL;
  52.    }
  53.  
  54.    virtual ir_visitor_status visit_enter(ir_function *ir)
  55.    {
  56.       assert(this->function == NULL);
  57.  
  58.       this->function = this->symbols->get_function(ir->name);
  59.       if (!this->function) {
  60.          this->function = new(this->mem_ctx) ir_function(ir->name);
  61.  
  62.          list->push_tail(this->function);
  63.  
  64.          /* Add the new function to the symbol table.
  65.           */
  66.          this->symbols->add_function(this->function);
  67.       }
  68.       return visit_continue;
  69.    }
  70.  
  71.    virtual ir_visitor_status visit_leave(ir_function *ir)
  72.    {
  73.       (void) ir;
  74.       assert(this->function != NULL);
  75.  
  76.       this->function = NULL;
  77.       return visit_continue;
  78.    }
  79.  
  80.    ir_visitor_status visit_enter(ir_function_signature *ir)
  81.    {
  82.       assert(this->function != NULL);
  83.  
  84.       ir_function_signature *copy = ir->clone_prototype(mem_ctx, NULL);
  85.  
  86.       this->function->add_signature(copy);
  87.  
  88.       /* Do not process child nodes of the ir_function_signature.  There can
  89.        * never be any nodes inside the ir_function_signature that we care
  90.        * about.  Instead continue with the next sibling.
  91.        */
  92.       return visit_continue_with_parent;
  93.    }
  94.  
  95. private:
  96.    exec_list *list;
  97.    ir_function *function;
  98.    glsl_symbol_table *symbols;
  99.    void *mem_ctx;
  100. };
  101.  
  102.  
  103. /**
  104.  * Import function prototypes from one IR tree into another
  105.  *
  106.  * \param source   Source instruction stream containing functions whose
  107.  *                 prototypes are to be imported
  108.  * \param dest     Destination instruction stream where new \c ir_function and
  109.  *                 \c ir_function_signature nodes will be stored
  110.  * \param symbols  Symbol table where new functions will be stored
  111.  * \param mem_ctx  ralloc memory context used for new allocations
  112.  */
  113. void
  114. import_prototypes(const exec_list *source, exec_list *dest,
  115.                   glsl_symbol_table *symbols, void *mem_ctx)
  116. {
  117.    import_prototype_visitor v(dest, symbols, mem_ctx);
  118.  
  119.    /* Making source be const is just extra documentation.
  120.     */
  121.    v.run(const_cast<exec_list *>(source));
  122. }
  123.