src/glsl/ir_import_prototypes.cpp

   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 }