source/glsl/resolve.cpp

   1 #include <msp/core/algorithm.h>
   2 #include <msp/core/raii.h>
   3 #include <msp/strings/utils.h>
   4 #include "reflect.h"
   5 #include "resolve.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11 namespace SL {
  12
  13 void BlockHierarchyResolver::enter(Block &block)
  14 {
  15         r_any_resolved |= (current_block!=block.parent);
  16         block.parent = current_block;
  17 }
  18
  19
  20 bool TypeResolver::apply(Stage &s)
  21 {
  22         stage = &s;
  23         s.types.clear();
  24         r_any_resolved = false;
  25         s.content.visit(*this);
  26         return r_any_resolved;
  27 }
  28
  29 TypeDeclaration *TypeResolver::get_or_create_array_type(TypeDeclaration &type)
  30 {
  31         auto i = array_types.find(&type);
  32         if(i!=array_types.end())
  33                 return i->second;
  34
  35         BasicTypeDeclaration *array = new BasicTypeDeclaration;
  36         array->source = INTERNAL_SOURCE;
  37         array->name = type.name+"[]";
  38         array->kind = BasicTypeDeclaration::ARRAY;
  39         array->base = type.name;
  40         array->base_type = &type;
  41         stage->content.body.insert(type_insert_point, array);
  42         array_types[&type] = array;
  43         return array;
  44 }
  45
  46 void TypeResolver::resolve_type(TypeDeclaration *&type, const string &name, bool array)
  47 {
  48         TypeDeclaration *resolved = 0;
  49         auto i = stage->types.find(name);
  50         if(i!=stage->types.end())
  51         {
  52                 auto j = alias_map.find(i->second);
  53                 resolved = (j!=alias_map.end() ? j->second : i->second);
  54         }
  55
  56         if(resolved && array)
  57                 resolved = get_or_create_array_type(*resolved);
  58
  59         r_any_resolved |= (resolved!=type);
  60         type=resolved;
  61 }
  62
  63 void TypeResolver::visit(Block &block)
  64 {
  65         for(auto i=block.body.begin(); i!=block.body.end(); ++i)
  66         {
  67                 if(!block.parent)
  68                         type_insert_point = i;
  69                 (*i)->visit(*this);
  70         }
  71 }
  72
  73 void TypeResolver::visit(BasicTypeDeclaration &type)
  74 {
  75         resolve_type(type.base_type, type.base, false);
  76
  77         if(type.kind==BasicTypeDeclaration::VECTOR && type.base_type)
  78                 if(BasicTypeDeclaration *basic_base = dynamic_cast<BasicTypeDeclaration *>(type.base_type))
  79                         if(basic_base->kind==BasicTypeDeclaration::VECTOR)
  80                         {
  81                                 type.kind = BasicTypeDeclaration::MATRIX;
  82                                 /* A matrix's base type is its column vector type.  This will put
  83                                 the column vector's size, i.e. the matrix's row count, in the high
  84                                 half of the size. */
  85                                 type.size |= basic_base->size<<16;
  86                         }
  87
  88         if(type.kind==BasicTypeDeclaration::ALIAS && type.base_type)
  89                 alias_map[&type] = type.base_type;
  90         else if(type.kind==BasicTypeDeclaration::ARRAY && type.base_type)
  91                 array_types[type.base_type] = &type;
  92
  93         stage->types.insert(make_pair(type.name, &type));
  94 }
  95
  96 void TypeResolver::visit(ImageTypeDeclaration &type)
  97 {
  98         resolve_type(type.base_type, type.base, false);
  99         stage->types.insert(make_pair(type.name, &type));
 100 }
 101
 102 void TypeResolver::visit(StructDeclaration &strct)
 103 {
 104         stage->types.insert(make_pair(strct.name, &strct));
 105         TraversingVisitor::visit(strct);
 106 }
 107
 108 void TypeResolver::visit(VariableDeclaration &var)
 109 {
 110         resolve_type(var.type_declaration, var.type, var.array);
 111         if(iface_block && var.interface==iface_block->interface)
 112                 var.interface.clear();
 113 }
 114
 115 void TypeResolver::visit(InterfaceBlock &iface)
 116 {
 117         if(iface.members)
 118         {
 119                 SetForScope<InterfaceBlock *> set_iface(iface_block, &iface);
 120                 iface.members->visit(*this);
 121
 122                 StructDeclaration *strct = new StructDeclaration;
 123                 strct->source = INTERNAL_SOURCE;
 124                 strct->name = format("_%s_%s", iface.interface, iface.block_name);
 125                 strct->members.body.splice(strct->members.body.begin(), iface.members->body);
 126                 stage->content.body.insert(type_insert_point, strct);
 127                 stage->types.insert(make_pair(strct->name, strct));
 128
 129                 iface.members = 0;
 130                 strct->interface_block = &iface;
 131                 iface.struct_declaration = strct;
 132         }
 133
 134         TypeDeclaration *type = iface.struct_declaration;
 135         if(type && iface.array)
 136                 type = get_or_create_array_type(*type);
 137         r_any_resolved = (type!=iface.type_declaration);
 138         iface.type_declaration = type;
 139 }
 140
 141 void TypeResolver::visit(FunctionDeclaration &func)
 142 {
 143         resolve_type(func.return_type_declaration, func.return_type, false);
 144         TraversingVisitor::visit(func);
 145 }
 146
 147
 148 bool VariableResolver::apply(Stage &s)
 149 {
 150         stage = &s;
 151         s.interface_blocks.clear();
 152         r_any_resolved = false;
 153         s.content.visit(*this);
 154         for(Statement *b: redeclared_builtins)
 155                 b->source = GENERATED_SOURCE;
 156         NodeRemover().apply(s, nodes_to_remove);
 157         return r_any_resolved;
 158 }
 159
 160 void VariableResolver::enter(Block &block)
 161 {
 162         block.variables.clear();
 163 }
 164
 165 void VariableResolver::visit(RefPtr<Expression> &expr)
 166 {
 167         r_replacement_expr = 0;
 168         expr->visit(*this);
 169         if(r_replacement_expr)
 170         {
 171                 expr = r_replacement_expr;
 172                 /* Don't record assignment target when doing a replacement, because chain
 173                 information won't be correct. */
 174                 r_assignment_target.declaration = 0;
 175                 r_any_resolved = true;
 176         }
 177         r_replacement_expr = 0;
 178 }
 179
 180 void VariableResolver::check_assignment_target(Statement *declaration)
 181 {
 182         if(record_target)
 183         {
 184                 if(r_assignment_target.declaration)
 185                 {
 186                         /* More than one reference found in assignment target.  Unable to
 187                         determine what the primary target is. */
 188                         record_target = false;
 189                         r_assignment_target.declaration = 0;
 190                 }
 191                 else
 192                         r_assignment_target.declaration = declaration;
 193         }
 194         // TODO This check is overly broad and may prevent some optimizations.
 195         else if(declaration && declaration==r_assignment_target.declaration)
 196                 r_self_referencing = true;
 197 }
 198
 199 void VariableResolver::visit(VariableReference &var)
 200 {
 201         VariableDeclaration *declaration = 0;
 202
 203         /* Look for variable declarations in the block hierarchy first.  Interface
 204         blocks are always defined in the top level so we can't accidentally skip
 205         one. */
 206         for(Block *block=current_block; (!declaration && block); block=block->parent)
 207         {
 208                 auto i = block->variables.find(var.name);
 209                 if(i!=block->variables.end())
 210                         declaration = i->second;
 211         }
 212
 213         if(!declaration)
 214         {
 215                 const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
 216                 auto i = blocks.find(var.name);
 217                 if(i==blocks.end())
 218                 {
 219                         // Look for the variable in anonymous interface blocks.
 220                         for(i=blocks.begin(); i!=blocks.end(); ++i)
 221                                 if(i->second->instance_name.empty() && i->second->struct_declaration)
 222                                         if(i->second->struct_declaration->members.variables.count(var.name))
 223                                                 break;
 224                 }
 225
 226                 if(i!=blocks.end())
 227                 {
 228                         /* The name refers to either an interface block with an instance name
 229                         or a variable declared inside an anonymous interface block.  Prepare
 230                         new syntax tree nodes accordingly. */
 231                         InterfaceBlockReference *iface_ref = new InterfaceBlockReference;
 232                         iface_ref->source = var.source;
 233                         iface_ref->line = var.line;
 234                         iface_ref->declaration = i->second;
 235
 236                         if(i->second->instance_name.empty())
 237                         {
 238                                 iface_ref->name = format("%s %s", i->second->interface, i->second->block_name);
 239
 240                                 MemberAccess *memacc = new MemberAccess;
 241                                 memacc->source = var.source;
 242                                 memacc->line = var.line;
 243                                 memacc->left = iface_ref;
 244                                 memacc->member = var.name;
 245
 246                                 r_replacement_expr = memacc;
 247                         }
 248                         else
 249                         {
 250                                 iface_ref->name = var.name;
 251                                 r_replacement_expr = iface_ref;
 252                         }
 253                 }
 254         }
 255
 256         r_any_resolved |= (declaration!=var.declaration);
 257         var.declaration = declaration;
 258
 259         check_assignment_target(var.declaration);
 260 }
 261
 262 void VariableResolver::visit(InterfaceBlockReference &iface)
 263 {
 264         auto i = stage->interface_blocks.find(iface.name);
 265         InterfaceBlock *declaration = (i!=stage->interface_blocks.end() ? i->second : 0);
 266         r_any_resolved |= (declaration!=iface.declaration);
 267         iface.declaration = declaration;
 268
 269         check_assignment_target(iface.declaration);
 270 }
 271
 272 void VariableResolver::visit(MemberAccess &memacc)
 273 {
 274         TraversingVisitor::visit(memacc);
 275
 276         VariableDeclaration *declaration = 0;
 277         int index = -1;
 278         if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(memacc.left->type))
 279         {
 280                 auto i = strct->members.variables.find(memacc.member);
 281                 if(i!=strct->members.variables.end())
 282                 {
 283                         declaration = i->second;
 284                         index = 0;
 285                         for(auto j=strct->members.body.begin(); (j!=strct->members.body.end() && j->get()!=i->second); ++j)
 286                                 ++index;
 287
 288                         if(record_target)
 289                                 add_to_chain(r_assignment_target, Assignment::Target::MEMBER, index);
 290                 }
 291         }
 292         else if(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(memacc.left->type))
 293         {
 294                 bool scalar_swizzle = ((basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT) && memacc.member.size()==1);
 295                 bool vector_swizzle = (basic->kind==BasicTypeDeclaration::VECTOR && memacc.member.size()<=4);
 296                 if(scalar_swizzle || vector_swizzle)
 297                 {
 298                         static const char component_names[] = { 'x', 'r', 's', 'y', 'g', 't', 'z', 'b', 'p', 'w', 'a', 'q' };
 299
 300                         bool ok = true;
 301                         uint8_t components[4] = { };
 302                         for(unsigned i=0; (ok && i<memacc.member.size()); ++i)
 303                                 ok = ((components[i] = (std::find(component_names, component_names+12, memacc.member[i])-component_names)/3) < 4);
 304
 305                         if(ok)
 306                         {
 307                                 Swizzle *swizzle = new Swizzle;
 308                                 swizzle->source = memacc.source;
 309                                 swizzle->line = memacc.line;
 310                                 swizzle->oper = memacc.oper;
 311                                 swizzle->left = memacc.left;
 312                                 swizzle->component_group = memacc.member;
 313                                 swizzle->count = memacc.member.size();
 314                                 copy(components, components+memacc.member.size(), swizzle->components);
 315                                 r_replacement_expr = swizzle;
 316                         }
 317                 }
 318         }
 319
 320         r_any_resolved |= (declaration!=memacc.declaration || index!=memacc.index);
 321         memacc.declaration = declaration;
 322         memacc.index = index;
 323 }
 324
 325 void VariableResolver::visit(Swizzle &swizzle)
 326 {
 327         TraversingVisitor::visit(swizzle);
 328
 329         if(record_target)
 330         {
 331                 unsigned mask = 0;
 332                 for(unsigned i=0; i<swizzle.count; ++i)
 333                         mask |= 1<<swizzle.components[i];
 334                 add_to_chain(r_assignment_target, Assignment::Target::SWIZZLE, mask);
 335         }
 336 }
 337
 338 void VariableResolver::visit(BinaryExpression &binary)
 339 {
 340         if(binary.oper->token[0]=='[')
 341         {
 342                 {
 343                         /* The subscript expression is not a part of the primary assignment
 344                         target. */
 345                         SetFlag set(record_target, false);
 346                         visit(binary.right);
 347                 }
 348                 visit(binary.left);
 349
 350                 if(record_target)
 351                 {
 352                         unsigned index = 0x3F;
 353                         if(Literal *literal_subscript = dynamic_cast<Literal *>(binary.right.get()))
 354                                 if(literal_subscript->value.check_type<int>())
 355                                         index = literal_subscript->value.value<int>();
 356                         add_to_chain(r_assignment_target, Assignment::Target::ARRAY, index);
 357                 }
 358         }
 359         else
 360                 TraversingVisitor::visit(binary);
 361 }
 362
 363 void VariableResolver::visit(Assignment &assign)
 364 {
 365         {
 366                 SetFlag set(record_target);
 367                 r_assignment_target = Assignment::Target();
 368                 visit(assign.left);
 369                 r_any_resolved |= (r_assignment_target<assign.target || assign.target<r_assignment_target);
 370                 assign.target = r_assignment_target;
 371         }
 372
 373         r_self_referencing = false;
 374         visit(assign.right);
 375         assign.self_referencing = (r_self_referencing || assign.oper->token[0]!='=');
 376 }
 377
 378 void VariableResolver::merge_layouts(Layout &to_layout, const Layout &from_layout)
 379 {
 380         for(const Layout::Qualifier &q: from_layout.qualifiers)
 381         {
 382                 auto i = find_member(to_layout.qualifiers, q.name, &Layout::Qualifier::name);
 383                 if(i!=to_layout.qualifiers.end())
 384                 {
 385                         i->has_value = q.value;
 386                         i->value = q.value;
 387                 }
 388                 else
 389                         to_layout.qualifiers.push_back(q);
 390         }
 391 }
 392
 393 void VariableResolver::redeclare_builtin(VariableDeclaration &existing, VariableDeclaration &var)
 394 {
 395         if(var.layout)
 396         {
 397                 if(existing.layout)
 398                         merge_layouts(*existing.layout, *var.layout);
 399                 else
 400                         existing.layout = var.layout;
 401         }
 402         if(var.array_size)
 403                 existing.array_size = var.array_size;
 404
 405         redeclared_builtins.push_back(&existing);
 406 }
 407
 408 void VariableResolver::visit(VariableDeclaration &var)
 409 {
 410         TraversingVisitor::visit(var);
 411
 412         auto i = current_block->variables.find(var.name);
 413         VariableDeclaration *existing = 0;
 414         InterfaceBlock *block = 0;
 415         if(i!=current_block->variables.end())
 416                 existing = i->second;
 417         else if(!current_block->parent)
 418         {
 419                 const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
 420                 for(auto j=blocks.begin(); j!=blocks.end(); ++j)
 421                         if(j->second->instance_name.empty() && j->second->struct_declaration)
 422                         {
 423                                 map<string, VariableDeclaration *> &block_vars = j->second->struct_declaration->members.variables;
 424                                 i = block_vars.find(var.name);
 425                                 if(i!=block_vars.end())
 426                                 {
 427                                         existing = i->second;
 428                                         block = j->second;
 429                                         break;
 430                                 }
 431                         }
 432         }
 433
 434         if(!existing)
 435                 current_block->variables.insert(make_pair(var.name, &var));
 436         else if(!current_block->parent && (block ? block->interface : existing->interface)==var.interface && existing->type==var.type && existing->array==var.array)
 437         {
 438                 if(existing->source==BUILTIN_SOURCE)
 439                 {
 440                         redeclare_builtin(*existing, var);
 441
 442                         if(block)
 443                         {
 444                                 redeclared_builtins.push_back(block);
 445                                 for(const auto &kvp: block->struct_declaration->members.variables)
 446                                         redeclared_builtins.push_back(kvp.second);
 447                         }
 448
 449                         nodes_to_remove.insert(&var);
 450                         r_any_resolved = true;
 451                 }
 452                 else if(existing->array && !existing->array_size && !var.layout && !var.init_expression)
 453                 {
 454                         existing->array_size = var.array_size;
 455                         nodes_to_remove.insert(&var);
 456                         r_any_resolved = true;
 457                 }
 458         }
 459 }
 460
 461 void VariableResolver::visit(InterfaceBlock &iface)
 462 {
 463         string key = format("%s %s", iface.interface, iface.block_name);
 464         auto i = stage->interface_blocks.find(key);
 465         if(i!=stage->interface_blocks.end())
 466         {
 467                 if(i->second->source==BUILTIN_SOURCE && iface.struct_declaration && i->second->struct_declaration)
 468                 {
 469                         const map<string, VariableDeclaration *> &vars = iface.struct_declaration->members.variables;
 470                         const map<string, VariableDeclaration *> &existing_vars = i->second->struct_declaration->members.variables;
 471
 472                         bool found_all = true;
 473                         for(const auto &kvp: vars)
 474                         {
 475                                 auto j = existing_vars.find(kvp.first);
 476                                 if(j!=existing_vars.end() && j->second->type==kvp.second->type && j->second->array==kvp.second->array)
 477                                         redeclare_builtin(*j->second, *kvp.second);
 478                                 else
 479                                         found_all = false;
 480                         }
 481
 482                         if(found_all)
 483                         {
 484                                 redeclared_builtins.push_back(i->second);
 485                                 nodes_to_remove.insert(&iface);
 486                                 nodes_to_remove.insert(iface.struct_declaration);
 487                         }
 488                 }
 489         }
 490         else
 491         {
 492                 /* Block names can be reused in different interfaces.  Prepend the interface
 493                 to the name to avoid conflicts. */
 494                 stage->interface_blocks.insert(make_pair(key, &iface));
 495                 if(!iface.instance_name.empty())
 496                         stage->interface_blocks.insert(make_pair(iface.instance_name, &iface));
 497         }
 498
 499         TraversingVisitor::visit(iface);
 500 }
 501
 502
 503 bool ExpressionResolver::apply(Stage &s)
 504 {
 505         stage = &s;
 506         r_any_resolved = false;
 507         s.content.visit(*this);
 508         return r_any_resolved;
 509 }
 510
 511 ExpressionResolver::Compatibility ExpressionResolver::get_compatibility(BasicTypeDeclaration &left, BasicTypeDeclaration &right)
 512 {
 513         if(&left==&right)
 514                 return SAME_TYPE;
 515         else if(can_convert(left, right))
 516                 return LEFT_CONVERTIBLE;
 517         else if(can_convert(right, left))
 518                 return RIGHT_CONVERTIBLE;
 519         else
 520                 return NOT_COMPATIBLE;
 521 }
 522
 523 BasicTypeDeclaration *ExpressionResolver::find_type(BasicTypeDeclaration::Kind kind, unsigned size, bool sign)
 524 {
 525         auto i = find_if(basic_types,
 526                 [kind, size, sign](const BasicTypeDeclaration *t){ return t->kind==kind && t->size==size && t->sign==sign; });
 527         return (i!=basic_types.end() ? *i : 0);
 528 }
 529
 530 BasicTypeDeclaration *ExpressionResolver::find_type(BasicTypeDeclaration &elem_type, BasicTypeDeclaration::Kind kind, unsigned size)
 531 {
 532         auto i = find_if(basic_types,
 533                 [&elem_type, kind, size](BasicTypeDeclaration *t){ return get_element_type(*t)==&elem_type && t->kind==kind && t->size==size; });
 534         return (i!=basic_types.end() ? *i : 0);
 535 }
 536
 537 void ExpressionResolver::convert_to(RefPtr<Expression> &expr, BasicTypeDeclaration &type)
 538 {
 539         RefPtr<FunctionCall> call = new FunctionCall;
 540         call->name = type.name;
 541         call->constructor = true;
 542         call->arguments.push_back_nocopy(expr);
 543         call->type = &type;
 544         expr = call;
 545 }
 546
 547 bool ExpressionResolver::convert_to_element(RefPtr<Expression> &expr, BasicTypeDeclaration &elem_type)
 548 {
 549         if(BasicTypeDeclaration *expr_basic = dynamic_cast<BasicTypeDeclaration *>(expr->type))
 550         {
 551                 BasicTypeDeclaration *to_type = &elem_type;
 552                 if(is_vector_or_matrix(*expr_basic))
 553                         to_type = find_type(elem_type, expr_basic->kind, expr_basic->size);
 554                 if(to_type)
 555                 {
 556                         convert_to(expr, *to_type);
 557                         return true;
 558                 }
 559         }
 560
 561         return false;
 562 }
 563
 564 bool ExpressionResolver::truncate_vector(RefPtr<Expression> &expr, unsigned size)
 565 {
 566         if(BasicTypeDeclaration *expr_basic = dynamic_cast<BasicTypeDeclaration *>(expr->type))
 567                 if(BasicTypeDeclaration *expr_elem = get_element_type(*expr_basic))
 568                 {
 569                         RefPtr<Swizzle> swizzle = new Swizzle;
 570                         swizzle->left = expr;
 571                         swizzle->oper = &Operator::get_operator(".", Operator::POSTFIX);
 572                         swizzle->component_group = string("xyzw", size);
 573                         swizzle->count = size;
 574                         for(unsigned i=0; i<size; ++i)
 575                                 swizzle->components[i] = i;
 576                         if(size==1)
 577                                 swizzle->type = expr_elem;
 578                         else
 579                                 swizzle->type = find_type(*expr_elem, BasicTypeDeclaration::VECTOR, size);
 580                         expr = swizzle;
 581
 582                         return true;
 583                 }
 584
 585         return false;
 586 }
 587
 588 void ExpressionResolver::resolve(Expression &expr, TypeDeclaration *type, bool lvalue)
 589 {
 590         r_any_resolved |= (type!=expr.type || lvalue!=expr.lvalue);
 591         expr.type = type;
 592         expr.lvalue = lvalue;
 593 }
 594
 595 void ExpressionResolver::visit(Block &block)
 596 {
 597         SetForScope<Block *> set_block(current_block, &block);
 598         for(auto i=block.body.begin(); i!=block.body.end(); ++i)
 599         {
 600                 insert_point = i;
 601                 (*i)->visit(*this);
 602         }
 603 }
 604
 605 void ExpressionResolver::visit(Literal &literal)
 606 {
 607         if(literal.value.check_type<bool>())
 608                 resolve(literal, find_type(BasicTypeDeclaration::BOOL, 1), false);
 609         else if(literal.value.check_type<int>())
 610                 resolve(literal, find_type(BasicTypeDeclaration::INT, 32, true), false);
 611         else if(literal.value.check_type<unsigned>())
 612                 resolve(literal, find_type(BasicTypeDeclaration::INT, 32, false), false);
 613         else if(literal.value.check_type<float>())
 614                 resolve(literal, find_type(BasicTypeDeclaration::FLOAT, 32), false);
 615 }
 616
 617 void ExpressionResolver::visit(VariableReference &var)
 618 {
 619         if(var.declaration)
 620                 resolve(var, var.declaration->type_declaration, true);
 621 }
 622
 623 void ExpressionResolver::visit(InterfaceBlockReference &iface)
 624 {
 625         if(iface.declaration)
 626                 resolve(iface, iface.declaration->type_declaration, true);
 627 }
 628
 629 void ExpressionResolver::visit(MemberAccess &memacc)
 630 {
 631         TraversingVisitor::visit(memacc);
 632
 633         if(memacc.declaration)
 634                 resolve(memacc, memacc.declaration->type_declaration, memacc.left->lvalue);
 635 }
 636
 637 void ExpressionResolver::visit(Swizzle &swizzle)
 638 {
 639         TraversingVisitor::visit(swizzle);
 640
 641         if(BasicTypeDeclaration *left_basic = dynamic_cast<BasicTypeDeclaration *>(swizzle.left->type))
 642         {
 643                 BasicTypeDeclaration *left_elem = get_element_type(*left_basic);
 644                 if(swizzle.count==1)
 645                         resolve(swizzle, left_elem, swizzle.left->lvalue);
 646                 else if(left_basic->kind==BasicTypeDeclaration::VECTOR && left_elem)
 647                         resolve(swizzle, find_type(*left_elem, left_basic->kind, swizzle.count), swizzle.left->lvalue);
 648         }
 649 }
 650
 651 void ExpressionResolver::visit(UnaryExpression &unary)
 652 {
 653         TraversingVisitor::visit(unary);
 654
 655         BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(unary.expression->type);
 656         if(!basic)
 657                 return;
 658
 659         char oper = unary.oper->token[0];
 660         if(oper=='!')
 661         {
 662                 if(basic->kind!=BasicTypeDeclaration::BOOL)
 663                         return;
 664         }
 665         else if(oper=='~')
 666         {
 667                 if(basic->kind!=BasicTypeDeclaration::INT)
 668                         return;
 669         }
 670         else if(oper=='+' || oper=='-')
 671         {
 672                 BasicTypeDeclaration *elem = get_element_type(*basic);
 673                 if(!elem || !is_scalar(*elem))
 674                         return;
 675         }
 676         resolve(unary, basic, unary.expression->lvalue);
 677 }
 678
 679 void ExpressionResolver::visit(BinaryExpression &binary, bool assign)
 680 {
 681         /* Binary operators are only defined for basic types (not for image or
 682         structure types). */
 683         BasicTypeDeclaration *basic_left = dynamic_cast<BasicTypeDeclaration *>(binary.left->type);
 684         BasicTypeDeclaration *basic_right = dynamic_cast<BasicTypeDeclaration *>(binary.right->type);
 685         if(!basic_left || !basic_right)
 686                 return;
 687
 688         char oper = binary.oper->token[0];
 689         if(oper=='[')
 690         {
 691                 /* Subscripting operates on vectors, matrices and arrays, and the right
 692                 operand must be an integer. */
 693                 if((!is_vector_or_matrix(*basic_left) && basic_left->kind!=BasicTypeDeclaration::ARRAY) || basic_right->kind!=BasicTypeDeclaration::INT)
 694                         return;
 695
 696                 resolve(binary, basic_left->base_type, binary.left->lvalue);
 697                 return;
 698         }
 699         else if(basic_left->kind==BasicTypeDeclaration::ARRAY || basic_right->kind==BasicTypeDeclaration::ARRAY)
 700                 // No other binary operator can be used with arrays.
 701                 return;
 702
 703         BasicTypeDeclaration *elem_left = get_element_type(*basic_left);
 704         BasicTypeDeclaration *elem_right = get_element_type(*basic_right);
 705         if(!elem_left || !elem_right)
 706                 return;
 707
 708         Compatibility compat = get_compatibility(*basic_left, *basic_right);
 709         Compatibility elem_compat = get_compatibility(*elem_left, *elem_right);
 710         if(elem_compat==NOT_COMPATIBLE)
 711                 return;
 712         if(assign && (compat==LEFT_CONVERTIBLE || elem_compat==LEFT_CONVERTIBLE))
 713                 return;
 714
 715         TypeDeclaration *type = 0;
 716         char oper2 = binary.oper->token[1];
 717         if((oper=='<' && oper2!='<') || (oper=='>' && oper2!='>'))
 718         {
 719                 /* Relational operators compare two scalar integer or floating-point
 720                 values. */
 721                 if(!is_scalar(*elem_left) || !is_scalar(*elem_right) || compat==NOT_COMPATIBLE)
 722                         return;
 723
 724                 type = find_type(BasicTypeDeclaration::BOOL, 1);
 725         }
 726         else if((oper=='=' || oper=='!') && oper2=='=')
 727         {
 728                 // Equality comparison can be done on any compatible types.
 729                 if(compat==NOT_COMPATIBLE)
 730                         return;
 731
 732                 type = find_type(BasicTypeDeclaration::BOOL, 1);
 733         }
 734         else if(oper2=='&' || oper2=='|' || oper2=='^')
 735         {
 736                 // Logical operators can only be applied to booleans.
 737                 if(basic_left->kind!=BasicTypeDeclaration::BOOL || basic_right->kind!=BasicTypeDeclaration::BOOL)
 738                         return;
 739
 740                 type = basic_left;
 741         }
 742         else if((oper=='&' || oper=='|' || oper=='^' || oper=='%') && !oper2)
 743         {
 744                 // Bitwise operators and modulo can only be applied to integers.
 745                 if(basic_left->kind!=BasicTypeDeclaration::INT || basic_right->kind!=BasicTypeDeclaration::INT)
 746                         return;
 747
 748                 type = (compat==LEFT_CONVERTIBLE ? basic_right : basic_left);
 749         }
 750         else if((oper=='<' || oper=='>') && oper2==oper)
 751         {
 752                 // Shifts apply to integer scalars and vectors, with some restrictions.
 753                 if(elem_left->kind!=BasicTypeDeclaration::INT || elem_right->kind!=BasicTypeDeclaration::INT)
 754                         return;
 755                 unsigned left_size = (basic_left->kind==BasicTypeDeclaration::INT ? 1 : basic_left->kind==BasicTypeDeclaration::VECTOR ? basic_left->size : 0);
 756                 unsigned right_size = (basic_right->kind==BasicTypeDeclaration::INT ? 1 : basic_right->kind==BasicTypeDeclaration::VECTOR ? basic_right->size : 0);
 757                 if(!left_size || (left_size==1 && right_size!=1) || (left_size>1 && right_size!=1 && right_size!=left_size))
 758                         return;
 759
 760                 /* If the left operand is a vector and right is scalar, convert the right
 761                 operand to a vector too. */
 762                 if(left_size>1 && right_size==1)
 763                 {
 764                         BasicTypeDeclaration *vec_right = find_type(*elem_right, basic_left->kind, basic_left->size);
 765                         if(!vec_right)
 766                                 return;
 767
 768                         convert_to(binary.right, *vec_right);
 769                 }
 770
 771                 type = basic_left;
 772                 // Don't perform conversion even if the operands are of different sizes.
 773                 compat = SAME_TYPE;
 774         }
 775         else if(oper=='+' || oper=='-' || oper=='*' || oper=='/')
 776         {
 777                 // Arithmetic operators require scalar elements.
 778                 if(!is_scalar(*elem_left) || !is_scalar(*elem_right))
 779                         return;
 780
 781                 if(oper=='*' && is_vector_or_matrix(*basic_left) && is_vector_or_matrix(*basic_right) &&
 782                         (basic_left->kind==BasicTypeDeclaration::MATRIX || basic_right->kind==BasicTypeDeclaration::MATRIX))
 783                 {
 784                         /* Multiplication has special rules when at least one operand is a
 785                         matrix and the other is a vector or a matrix. */
 786                         unsigned left_columns = basic_left->size&0xFFFF;
 787                         unsigned right_rows = basic_right->size;
 788                         if(basic_right->kind==BasicTypeDeclaration::MATRIX)
 789                                 right_rows >>= 16;
 790                         if(left_columns!=right_rows)
 791                                 return;
 792
 793                         BasicTypeDeclaration *elem_result = (elem_compat==LEFT_CONVERTIBLE ? elem_right : elem_left);
 794
 795                         if(basic_left->kind==BasicTypeDeclaration::VECTOR)
 796                                 type = find_type(*elem_result, BasicTypeDeclaration::VECTOR, basic_right->size&0xFFFF);
 797                         else if(basic_right->kind==BasicTypeDeclaration::VECTOR)
 798                                 type = find_type(*elem_result, BasicTypeDeclaration::VECTOR, basic_left->size>>16);
 799                         else
 800                                 type = find_type(*elem_result, BasicTypeDeclaration::MATRIX, (basic_left->size&0xFFFF0000)|(basic_right->size&0xFFFF));
 801                 }
 802                 else if(compat==NOT_COMPATIBLE)
 803                 {
 804                         // Arithmetic between scalars and matrices or vectors is supported.
 805                         if(is_scalar(*basic_left) && is_vector_or_matrix(*basic_right))
 806                                 type = (elem_compat==RIGHT_CONVERTIBLE ? find_type(*elem_left, basic_right->kind, basic_right->size) : basic_right);
 807                         else if(is_vector_or_matrix(*basic_left) && is_scalar(*basic_right))
 808                                 type = (elem_compat==LEFT_CONVERTIBLE ? find_type(*elem_right, basic_left->kind, basic_left->size) : basic_left);
 809                         else
 810                                 return;
 811                 }
 812                 else if(compat==LEFT_CONVERTIBLE)
 813                         type = basic_right;
 814                 else
 815                         type = basic_left;
 816         }
 817         else
 818                 return;
 819
 820         if(assign && type!=basic_left)
 821                 return;
 822
 823         bool converted = true;
 824         if(compat==LEFT_CONVERTIBLE)
 825                 convert_to(binary.left, *basic_right);
 826         else if(compat==RIGHT_CONVERTIBLE)
 827                 convert_to(binary.right, *basic_left);
 828         else if(elem_compat==LEFT_CONVERTIBLE)
 829                 converted = convert_to_element(binary.left, *elem_right);
 830         else if(elem_compat==RIGHT_CONVERTIBLE)
 831                 converted = convert_to_element(binary.right, *elem_left);
 832
 833         if(!converted)
 834                 type = 0;
 835
 836         resolve(binary, type, assign);
 837 }
 838
 839 void ExpressionResolver::visit(BinaryExpression &binary)
 840 {
 841         TraversingVisitor::visit(binary);
 842         visit(binary, false);
 843 }
 844
 845 void ExpressionResolver::visit(Assignment &assign)
 846 {
 847         TraversingVisitor::visit(assign);
 848
 849         if(assign.oper->token[0]!='=')
 850                 return visit(assign, true);
 851         else if(assign.left->type!=assign.right->type)
 852         {
 853                 BasicTypeDeclaration *basic_left = dynamic_cast<BasicTypeDeclaration *>(assign.left->type);
 854                 BasicTypeDeclaration *basic_right = dynamic_cast<BasicTypeDeclaration *>(assign.right->type);
 855                 if(!basic_left || !basic_right)
 856                         return;
 857
 858                 Compatibility compat = get_compatibility(*basic_left, *basic_right);
 859                 if(compat==RIGHT_CONVERTIBLE)
 860                         convert_to(assign.right, *basic_left);
 861                 else if(compat!=SAME_TYPE)
 862                         return;
 863         }
 864
 865         resolve(assign, assign.left->type, true);
 866 }
 867
 868 void ExpressionResolver::visit(TernaryExpression &ternary)
 869 {
 870         TraversingVisitor::visit(ternary);
 871
 872         BasicTypeDeclaration *basic_cond = dynamic_cast<BasicTypeDeclaration *>(ternary.condition->type);
 873         if(!basic_cond || basic_cond->kind!=BasicTypeDeclaration::BOOL)
 874                 return;
 875
 876         TypeDeclaration *type = 0;
 877         if(ternary.true_expr->type==ternary.false_expr->type)
 878                 type = ternary.true_expr->type;
 879         else
 880         {
 881                 BasicTypeDeclaration *basic_true = dynamic_cast<BasicTypeDeclaration *>(ternary.true_expr->type);
 882                 BasicTypeDeclaration *basic_false = dynamic_cast<BasicTypeDeclaration *>(ternary.false_expr->type);
 883                 if(!basic_true || !basic_false)
 884                         return;
 885
 886                 Compatibility compat = get_compatibility(*basic_true, *basic_false);
 887                 if(compat==NOT_COMPATIBLE)
 888                         return;
 889
 890                 type = (compat==LEFT_CONVERTIBLE ? basic_true : basic_false);
 891
 892                 if(compat==LEFT_CONVERTIBLE)
 893                         convert_to(ternary.true_expr, *basic_false);
 894                 else if(compat==RIGHT_CONVERTIBLE)
 895                         convert_to(ternary.false_expr, *basic_true);
 896         }
 897
 898         resolve(ternary, type, false);
 899 }
 900
 901 void ExpressionResolver::visit_constructor(FunctionCall &call)
 902 {
 903         if(call.arguments.empty())
 904                 return;
 905
 906         auto i = stage->types.find(call.name);
 907         if(i==stage->types.end())
 908                 return;
 909         else if(call.arguments.size()==1 && i->second==call.arguments[0]->type)
 910                 ;
 911         else if(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(i->second))
 912         {
 913                 BasicTypeDeclaration *elem = get_element_type(*basic);
 914                 if(!elem)
 915                         return;
 916
 917                 vector<ArgumentInfo> args;
 918                 args.reserve(call.arguments.size());
 919                 unsigned arg_component_total = 0;
 920                 bool has_matrices = false;
 921                 for(const RefPtr<Expression> &a: call.arguments)
 922                 {
 923                         ArgumentInfo info;
 924                         if(!(info.type=dynamic_cast<BasicTypeDeclaration *>(a->type)))
 925                                 return;
 926                         if(is_scalar(*info.type) || info.type->kind==BasicTypeDeclaration::BOOL)
 927                                 info.component_count = 1;
 928                         else if(info.type->kind==BasicTypeDeclaration::VECTOR)
 929                                 info.component_count = info.type->size;
 930                         else if(info.type->kind==BasicTypeDeclaration::MATRIX)
 931                         {
 932                                 info.component_count = (info.type->size>>16)*(info.type->size&0xFFFF);
 933                                 has_matrices = true;
 934                         }
 935                         else
 936                                 return;
 937                         arg_component_total += info.component_count;
 938                         args.push_back(info);
 939                 }
 940
 941                 bool convert_args = false;
 942                 if((is_scalar(*basic) || basic->kind==BasicTypeDeclaration::BOOL) && call.arguments.size()==1 && !has_matrices)
 943                 {
 944                         if(arg_component_total>1)
 945                                 truncate_vector(call.arguments.front(), 1);
 946
 947                         /* Single-element type constructors never need to convert their
 948                         arguments because the constructor *is* the conversion. */
 949                 }
 950                 else if(basic->kind==BasicTypeDeclaration::VECTOR && !has_matrices)
 951                 {
 952                         /* Vector constructors need either a single scalar argument or
 953                         enough components to fill out the vector. */
 954                         if(arg_component_total!=1 && arg_component_total<basic->size)
 955                                 return;
 956
 957                         /* A vector of same size can be converted directly.  For other
 958                         combinations the individual arguments need to be converted. */
 959                         if(call.arguments.size()==1)
 960                         {
 961                                 if(arg_component_total==1)
 962                                         convert_args = true;
 963                                 else if(arg_component_total>basic->size)
 964                                         truncate_vector(call.arguments.front(), basic->size);
 965                         }
 966                         else if(arg_component_total==basic->size)
 967                                 convert_args = true;
 968                         else
 969                                 return;
 970                 }
 971                 else if(basic->kind==BasicTypeDeclaration::MATRIX)
 972                 {
 973                         unsigned column_count = basic->size&0xFFFF;
 974                         unsigned row_count = basic->size>>16;
 975                         if(call.arguments.size()==1)
 976                         {
 977                                 /* A matrix can be constructed from a single element or another
 978                                 matrix of sufficient size. */
 979                                 if(arg_component_total==1)
 980                                         convert_args = true;
 981                                 else if(args.front().type->kind==BasicTypeDeclaration::MATRIX)
 982                                 {
 983                                         unsigned arg_columns = args.front().type->size&0xFFFF;
 984                                         unsigned arg_rows = args.front().type->size>>16;
 985                                         if(arg_columns<column_count || arg_rows<row_count)
 986                                                 return;
 987
 988                                         /* Always generate a temporary here and let the optimization
 989                                         stage inline it if that's reasonable. */
 990                                         RefPtr<VariableDeclaration> temporary = new VariableDeclaration;
 991                                         temporary->type = args.front().type->name;
 992                                         temporary->name = get_unused_variable_name(*current_block, "_temp");
 993                                         temporary->init_expression = call.arguments.front();
 994                                         current_block->body.insert(insert_point, temporary);
 995
 996                                         // Create expressions to build each column.
 997                                         vector<RefPtr<Expression> > columns;
 998                                         columns.reserve(column_count);
 999                                         for(unsigned j=0; j<column_count; ++j)
1000                                         {
1001                                                 RefPtr<VariableReference> ref = new VariableReference;
1002                                                 ref->name = temporary->name;
1003
1004                                                 RefPtr<Literal> index = new Literal;
1005                                                 index->token = lexical_cast<string>(j);
1006                                                 index->value = static_cast<int>(j);
1007
1008                                                 RefPtr<BinaryExpression> subscript = new BinaryExpression;
1009                                                 subscript->left = ref;
1010                                                 subscript->oper = &Operator::get_operator("[", Operator::BINARY);
1011                                                 subscript->right = index;
1012                                                 subscript->type = args.front().type->base_type;
1013
1014                                                 columns.push_back(subscript);
1015                                                 if(arg_rows>row_count)
1016                                                         truncate_vector(columns.back(), row_count);
1017                                         }
1018
1019                                         call.arguments.resize(column_count);
1020                                         copy(columns.begin(), columns.end(), call.arguments.begin());
1021
1022                                         /* Let VariableResolver process the new nodes and finish
1023                                         resolving the constructor on the next pass. */
1024                                         r_any_resolved = true;
1025                                         return;
1026                                 }
1027                                 else
1028                                         return;
1029                         }
1030                         else if(arg_component_total==column_count*row_count && !has_matrices)
1031                         {
1032                                 /* Construct a matrix from individual components in column-major
1033                                 order.  Arguments must align at column boundaries. */
1034                                 vector<RefPtr<Expression> > columns;
1035                                 columns.reserve(column_count);
1036
1037                                 vector<RefPtr<Expression> > column_args;
1038                                 column_args.reserve(row_count);
1039                                 unsigned column_component_count = 0;
1040
1041                                 for(unsigned j=0; j<call.arguments.size(); ++j)
1042                                 {
1043                                         const ArgumentInfo &info = args[j];
1044                                         if(!column_component_count && info.type->kind==BasicTypeDeclaration::VECTOR && info.component_count==row_count)
1045                                                 // A vector filling the entire column can be used as is.
1046                                                 columns.push_back(call.arguments[j]);
1047                                         else
1048                                         {
1049                                                 column_args.push_back(call.arguments[j]);
1050                                                 column_component_count += info.component_count;
1051                                                 if(column_component_count==row_count)
1052                                                 {
1053                                                         /* The column has filled up.  Create a vector constructor
1054                                                         for it.*/
1055                                                         RefPtr<FunctionCall> column_call = new FunctionCall;
1056                                                         column_call->name = basic->base_type->name;
1057                                                         column_call->constructor = true;
1058                                                         column_call->arguments.resize(column_args.size());
1059                                                         copy(column_args.begin(), column_args.end(), column_call->arguments.begin());
1060                                                         column_call->type = basic->base_type;
1061                                                         visit_constructor(*column_call);
1062                                                         columns.push_back(column_call);
1063
1064                                                         column_args.clear();
1065                                                         column_component_count = 0;
1066                                                 }
1067                                                 else if(column_component_count>row_count)
1068                                                         // Argument alignment mismatch.
1069                                                         return;
1070                                         }
1071                                 }
1072                         }
1073                         else
1074                                 return;
1075                 }
1076                 else
1077                         return;
1078
1079                 if(convert_args)
1080                 {
1081                         // The argument list may have changed so can't rely on args.
1082                         for(RefPtr<Expression> &a: call.arguments)
1083                                 if(BasicTypeDeclaration *basic_arg = dynamic_cast<BasicTypeDeclaration *>(a->type))
1084                                 {
1085                                         BasicTypeDeclaration *elem_arg = get_element_type(*basic_arg);
1086                                         if(elem_arg!=elem)
1087                                                 convert_to_element(a, *elem);
1088                                 }
1089                 }
1090         }
1091         else if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(i->second))
1092         {
1093                 if(call.arguments.size()!=strct->members.body.size())
1094                         return;
1095
1096                 auto j = call.arguments.begin();
1097                 for(const RefPtr<Statement> &s: strct->members.body)
1098                 {
1099                         if(VariableDeclaration *var = dynamic_cast<VariableDeclaration *>(s.get()))
1100                         {
1101                                 if(!(*j)->type || (*j)->type!=var->type_declaration)
1102                                         return;
1103                         }
1104                         else
1105                                 return;
1106                         ++j;
1107                 }
1108         }
1109
1110         resolve(call, i->second, false);
1111 }
1112
1113 void ExpressionResolver::visit(FunctionCall &call)
1114 {
1115         TraversingVisitor::visit(call);
1116
1117         if(call.declaration)
1118                 resolve(call, call.declaration->return_type_declaration, false);
1119         else if(call.constructor)
1120                 visit_constructor(call);
1121 }
1122
1123 void ExpressionResolver::visit(BasicTypeDeclaration &type)
1124 {
1125         basic_types.push_back(&type);
1126 }
1127
1128 void ExpressionResolver::visit(VariableDeclaration &var)
1129 {
1130         TraversingVisitor::visit(var);
1131         if(!var.init_expression)
1132                 return;
1133
1134         BasicTypeDeclaration *var_basic = dynamic_cast<BasicTypeDeclaration *>(var.type_declaration);
1135         BasicTypeDeclaration *init_basic = dynamic_cast<BasicTypeDeclaration *>(var.init_expression->type);
1136         if(!var_basic || !init_basic)
1137                 return;
1138
1139         Compatibility compat = get_compatibility(*var_basic, *init_basic);
1140         if(compat==RIGHT_CONVERTIBLE)
1141                 convert_to(var.init_expression, *var_basic);
1142 }
1143
1144
1145 bool FunctionResolver::apply(Stage &s)
1146 {
1147         stage = &s;
1148         s.functions.clear();
1149         r_any_resolved = false;
1150         s.content.visit(*this);
1151         return r_any_resolved;
1152 }
1153
1154 bool FunctionResolver::can_convert_arguments(const FunctionCall &call, const FunctionDeclaration &decl)
1155 {
1156         if(decl.parameters.size()!=call.arguments.size())
1157                 return false;
1158
1159         for(unsigned j=0; j<call.arguments.size(); ++j)
1160         {
1161                 const TypeDeclaration *arg_type = call.arguments[j]->type;
1162                 const TypeDeclaration *param_type = decl.parameters[j]->type_declaration;
1163                 if(arg_type==param_type)
1164                         continue;
1165
1166                 const BasicTypeDeclaration *arg_basic = dynamic_cast<const BasicTypeDeclaration *>(arg_type);
1167                 const BasicTypeDeclaration *param_basic = dynamic_cast<const BasicTypeDeclaration *>(param_type);
1168                 if(arg_basic && param_basic && can_convert(*arg_basic, *param_basic))
1169                         continue;
1170
1171                 return false;
1172         }
1173
1174         return true;
1175 }
1176
1177 void FunctionResolver::visit(FunctionCall &call)
1178 {
1179         FunctionDeclaration *declaration = 0;
1180         if(stage->types.count(call.name))
1181                 call.constructor = true;
1182         else
1183         {
1184                 string arg_types;
1185                 bool has_signature = true;
1186                 for(auto i=call.arguments.begin(); (has_signature && i!=call.arguments.end()); ++i)
1187                 {
1188                         if((*i)->type)
1189                                 append(arg_types, ",", (*i)->type->name);
1190                         else
1191                                 has_signature = false;
1192                 }
1193
1194                 if(has_signature)
1195                 {
1196                         auto i = stage->functions.find(format("%s(%s)", call.name, arg_types));
1197                         declaration = (i!=stage->functions.end() ? i->second : 0);
1198
1199                         if(!declaration)
1200                         {
1201                                 for(i=stage->functions.lower_bound(call.name+"("); (i!=stage->functions.end() && i->second->name==call.name); ++i)
1202                                         if(can_convert_arguments(call, *i->second))
1203                                         {
1204                                                 if(declaration)
1205                                                 {
1206                                                         declaration = 0;
1207                                                         break;
1208                                                 }
1209                                                 else
1210                                                         declaration = i->second;
1211                                         }
1212                         }
1213                 }
1214         }
1215
1216         r_any_resolved |= (declaration!=call.declaration);
1217         call.declaration = declaration;
1218
1219         TraversingVisitor::visit(call);
1220 }
1221
1222 void FunctionResolver::visit(FunctionDeclaration &func)
1223 {
1224         if(func.signature.empty())
1225         {
1226                 string param_types;
1227                 for(const RefPtr<VariableDeclaration> &p: func.parameters)
1228                 {
1229                         if(p->type_declaration)
1230                                 append(param_types, ",", p->type_declaration->name);
1231                         else
1232                                 return;
1233                 }
1234                 func.signature = format("(%s)", param_types);
1235                 r_any_resolved = true;
1236         }
1237
1238         string key = func.name+func.signature;
1239         FunctionDeclaration *&stage_decl = stage->functions[key];
1240         vector<FunctionDeclaration *> &decls = declarations[key];
1241         if(func.definition==&func)
1242         {
1243                 if(stage_decl && stage_decl->definition)
1244                 {
1245                         if(!func.overrd)
1246                                 stage->diagnostics.push_back(Diagnostic(Diagnostic::WARN, func.source, func.line,
1247                                         format("Overriding function '%s' without the override keyword is deprecated", key)));
1248                         if(!stage_decl->definition->virtua)
1249                                 stage->diagnostics.push_back(Diagnostic(Diagnostic::WARN, func.source, func.line,
1250                                         format("Overriding function '%s' not declared as virtual is deprecated", key)));
1251                 }
1252                 stage_decl = &func;
1253
1254                 // Set all previous declarations to use this definition.
1255                 for(FunctionDeclaration *f: decls)
1256                 {
1257                         r_any_resolved |= (func.definition!=f->definition);
1258                         f->definition = func.definition;
1259                         f->body.body.clear();
1260                 }
1261         }
1262         else
1263         {
1264                 FunctionDeclaration *definition = (stage_decl ? stage_decl->definition : 0);
1265                 r_any_resolved |= (definition!=func.definition);
1266                 func.definition = definition;
1267
1268                 if(!stage_decl)
1269                         stage_decl = &func;
1270         }
1271         decls.push_back(&func);
1272
1273         TraversingVisitor::visit(func);
1274 }
1275
1276 } // namespace SL
1277 } // namespace GL
1278 } // namespace Msp