src/glsl/glsl_symbol_table.cpp

   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright © 2010 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "glsl_symbol_table.h"
  26
  27 class symbol_table_entry {
  28 public:
  29    DECLARE_RALLOC_CXX_OPERATORS(symbol_table_entry);
  30
  31    bool add_interface(const glsl_type *i, enum ir_variable_mode mode)
  32    {
  33       const glsl_type **dest;
  34
  35       switch (mode) {
  36       case ir_var_uniform:
  37          dest = &ibu;
  38          break;
  39       case ir_var_shader_in:
  40          dest = &ibi;
  41          break;
  42       case ir_var_shader_out:
  43          dest = &ibo;
  44          break;
  45       default:
  46          assert(!"Unsupported interface variable mode!");
  47          return false;
  48       }
  49
  50       if (*dest != NULL) {
  51          return false;
  52       } else {
  53          *dest = i;
  54          return true;
  55       }
  56    }
  57
  58    const glsl_type *get_interface(enum ir_variable_mode mode)
  59    {
  60       switch (mode) {
  61       case ir_var_uniform:
  62          return ibu;
  63       case ir_var_shader_in:
  64          return ibi;
  65       case ir_var_shader_out:
  66          return ibo;
  67       default:
  68          assert(!"Unsupported interface variable mode!");
  69          return NULL;
  70       }
  71    }
  72
  73    symbol_table_entry(ir_variable *v)               :
  74       v(v), f(0), t(0), ibu(0), ibi(0), ibo(0), a(0) {}
  75    symbol_table_entry(ir_function *f)               :
  76       v(0), f(f), t(0), ibu(0), ibi(0), ibo(0), a(0) {}
  77    symbol_table_entry(const glsl_type *t)           :
  78       v(0), f(0), t(t), ibu(0), ibi(0), ibo(0), a(0) {}
  79    symbol_table_entry(const glsl_type *t, enum ir_variable_mode mode) :
  80       v(0), f(0), t(0), ibu(0), ibi(0), ibo(0), a(0)
  81    {
  82       assert(t->is_interface());
  83       add_interface(t, mode);
  84    }
  85    symbol_table_entry(const class ast_type_specifier *a):
  86       v(0), f(0), t(0), ibu(0), ibi(0), ibo(0), a(a) {}
  87
  88    ir_variable *v;
  89    ir_function *f;
  90    const glsl_type *t;
  91    const glsl_type *ibu;
  92    const glsl_type *ibi;
  93    const glsl_type *ibo;
  94    const class ast_type_specifier *a;
  95 };
  96
  97 glsl_symbol_table::glsl_symbol_table()
  98 {
  99    this->separate_function_namespace = false;
 100    this->table = _mesa_symbol_table_ctor();
 101    this->mem_ctx = ralloc_context(NULL);
 102 }
 103
 104 glsl_symbol_table::~glsl_symbol_table()
 105 {
 106    _mesa_symbol_table_dtor(table);
 107    ralloc_free(mem_ctx);
 108 }
 109
 110 void glsl_symbol_table::push_scope()
 111 {
 112    _mesa_symbol_table_push_scope(table);
 113 }
 114
 115 void glsl_symbol_table::pop_scope()
 116 {
 117    _mesa_symbol_table_pop_scope(table);
 118 }
 119
 120 bool glsl_symbol_table::name_declared_this_scope(const char *name)
 121 {
 122    return _mesa_symbol_table_symbol_scope(table, -1, name) == 0;
 123 }
 124
 125 bool glsl_symbol_table::add_variable(ir_variable *v)
 126 {
 127    if (this->separate_function_namespace) {
 128       /* In 1.10, functions and variables have separate namespaces. */
 129       symbol_table_entry *existing = get_entry(v->name);
 130       if (name_declared_this_scope(v->name)) {
 131          /* If there's already an existing function (not a constructor!) in
 132           * the current scope, just update the existing entry to include 'v'.
 133           */
 134          if (existing->v == NULL && existing->t == NULL) {
 135             existing->v = v;
 136             return true;
 137          }
 138       } else {
 139          /* If not declared at this scope, add a new entry.  But if an existing
 140           * entry includes a function, propagate that to this block - otherwise
 141           * the new variable declaration would shadow the function.
 142           */
 143          symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v);
 144          if (existing != NULL)
 145             entry->f = existing->f;
 146          int added = _mesa_symbol_table_add_symbol(table, -1, v->name, entry);
 147          assert(added == 0);
 148          (void)added;
 149          return true;
 150       }
 151       return false;
 152    }
 153
 154    /* 1.20+ rules: */
 155    symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v);
 156    return _mesa_symbol_table_add_symbol(table, -1, v->name, entry) == 0;
 157 }
 158
 159 bool glsl_symbol_table::add_type(const char *name, const glsl_type *t)
 160 {
 161    symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(t);
 162    return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;
 163 }
 164
 165 bool glsl_symbol_table::add_interface(const char *name, const glsl_type *i,
 166                                       enum ir_variable_mode mode)
 167 {
 168    assert(i->is_interface());
 169    symbol_table_entry *entry = get_entry(name);
 170    if (entry == NULL) {
 171       symbol_table_entry *entry =
 172          new(mem_ctx) symbol_table_entry(i, mode);
 173       bool add_interface_symbol_result =
 174          _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;
 175       assert(add_interface_symbol_result);
 176       return add_interface_symbol_result;
 177    } else {
 178       return entry->add_interface(i, mode);
 179    }
 180 }
 181
 182 bool glsl_symbol_table::add_function(ir_function *f)
 183 {
 184    if (this->separate_function_namespace && name_declared_this_scope(f->name)) {
 185       /* In 1.10, functions and variables have separate namespaces. */
 186       symbol_table_entry *existing = get_entry(f->name);
 187       if ((existing->f == NULL) && (existing->t == NULL)) {
 188          existing->f = f;
 189          return true;
 190       }
 191    }
 192    symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f);
 193    return _mesa_symbol_table_add_symbol(table, -1, f->name, entry) == 0;
 194 }
 195
 196 void glsl_symbol_table::add_global_function(ir_function *f)
 197 {
 198    symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f);
 199    int added = _mesa_symbol_table_add_global_symbol(table, -1, f->name, entry);
 200    assert(added == 0);
 201    (void)added;
 202 }
 203
 204 ir_variable *glsl_symbol_table::get_variable(const char *name)
 205 {
 206    symbol_table_entry *entry = get_entry(name);
 207    return entry != NULL ? entry->v : NULL;
 208 }
 209
 210 const glsl_type *glsl_symbol_table::get_type(const char *name)
 211 {
 212    symbol_table_entry *entry = get_entry(name);
 213    return entry != NULL ? entry->t : NULL;
 214 }
 215
 216 const glsl_type *glsl_symbol_table::get_interface(const char *name,
 217                                                   enum ir_variable_mode mode)
 218 {
 219    symbol_table_entry *entry = get_entry(name);
 220    return entry != NULL ? entry->get_interface(mode) : NULL;
 221 }
 222
 223 ir_function *glsl_symbol_table::get_function(const char *name)
 224 {
 225    symbol_table_entry *entry = get_entry(name);
 226    return entry != NULL ? entry->f : NULL;
 227 }
 228
 229 symbol_table_entry *glsl_symbol_table::get_entry(const char *name)
 230 {
 231    return (symbol_table_entry *)
 232       _mesa_symbol_table_find_symbol(table, -1, name);
 233 }
 234
 235 void
 236 glsl_symbol_table::disable_variable(const char *name)
 237 {
 238    /* Ideally we would remove the variable's entry from the symbol table, but
 239     * that would be difficult.  Fortunately, since this is only used for
 240     * built-in variables, it won't be possible for the shader to re-introduce
 241     * the variable later, so all we really need to do is to make sure that
 242     * further attempts to access it using get_variable() will return NULL.
 243     */
 244    symbol_table_entry *entry = get_entry(name);
 245    if (entry != NULL) {
 246       entry->v = NULL;
 247    }
 248 }