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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. namespace {
  34.  
  35. /**
  36.  * Visitor used to import function prototypes
  37.  *
  38.  * Normally the \c clone method of either \c ir_function or
  39.  * \c ir_function_signature could be used.  However, we don't want a complete
  40.  * clone of the \c ir_function_signature.  We want everything \b except the
  41.  * body of the function.
  42.  */
  43. class import_prototype_visitor : public ir_hierarchical_visitor {
  44. public:
  45.    /**
  46.     */
  47.    import_prototype_visitor(exec_list *list, glsl_symbol_table *symbols,
  48.                             void *mem_ctx)
  49.    {
  50.       this->mem_ctx = mem_ctx;
  51.       this->list = list;
  52.       this->symbols = symbols;
  53.       this->function = NULL;
  54.    }
  55.  
  56.    virtual ir_visitor_status visit_enter(ir_function *ir)
  57.    {
  58.       assert(this->function == NULL);
  59.  
  60.       this->function = this->symbols->get_function(ir->name);
  61.       if (!this->function) {
  62.          this->function = new(this->mem_ctx) ir_function(ir->name);
  63.  
  64.          list->push_tail(this->function);
  65.  
  66.          /* Add the new function to the symbol table.
  67.           */
  68.          this->symbols->add_function(this->function);
  69.       }
  70.       return visit_continue;
  71.    }
  72.  
  73.    virtual ir_visitor_status visit_leave(ir_function *ir)
  74.    {
  75.       (void) ir;
  76.       assert(this->function != NULL);
  77.  
  78.       this->function = NULL;
  79.       return visit_continue;
  80.    }
  81.  
  82.    ir_visitor_status visit_enter(ir_function_signature *ir)
  83.    {
  84.       assert(this->function != NULL);
  85.  
  86.       ir_function_signature *copy = ir->clone_prototype(mem_ctx, NULL);
  87.  
  88.       this->function->add_signature(copy);
  89.  
  90.       /* Do not process child nodes of the ir_function_signature.  There can
  91.        * never be any nodes inside the ir_function_signature that we care
  92.        * about.  Instead continue with the next sibling.
  93.        */
  94.       return visit_continue_with_parent;
  95.    }
  96.  
  97. private:
  98.    exec_list *list;
  99.    ir_function *function;
  100.    glsl_symbol_table *symbols;
  101.    void *mem_ctx;
  102. };
  103.  
  104. } /* anonymous namespace */
  105.  
  106. /**
  107.  * Import function prototypes from one IR tree into another
  108.  *
  109.  * \param source   Source instruction stream containing functions whose
  110.  *                 prototypes are to be imported
  111.  * \param dest     Destination instruction stream where new \c ir_function and
  112.  *                 \c ir_function_signature nodes will be stored
  113.  * \param symbols  Symbol table where new functions will be stored
  114.  * \param mem_ctx  ralloc memory context used for new allocations
  115.  */
  116. void
  117. import_prototypes(const exec_list *source, exec_list *dest,
  118.                   glsl_symbol_table *symbols, void *mem_ctx)
  119. {
  120.    import_prototype_visitor v(dest, symbols, mem_ctx);
  121.  
  122.    /* Making source be const is just extra documentation.
  123.     */
  124.    v.run(const_cast<exec_list *>(source));
  125. }
  126.