source/glsl/validate.cpp

   1 #include <cstring>
   2 #include <msp/core/algorithm.h>
   3 #include <msp/core/raii.h>
   4 #include <msp/strings/format.h>
   5 #include <msp/strings/utils.h>
   6 #include "reflect.h"
   7 #include "validate.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13 namespace SL {
  14
  15 void Validator::diagnose(Node &node, Node &provoking_node, Diagnostic::Severity severity, const string &message)
  16 {
  17         Diagnostic diag;
  18         diag.severity = severity;
  19         diag.source = node.source;
  20         diag.line = node.line;
  21         diag.provoking_source = provoking_node.source;
  22         diag.provoking_line = provoking_node.line;
  23         diag.message = message;
  24         stage->diagnostics.push_back(diag);
  25
  26         last_provoker = &provoking_node;
  27 }
  28
  29 void Validator::add_info(Node &node, const string &message)
  30 {
  31         if(!last_provoker)
  32                 throw logic_error("Tried to add info without a previous provoker");
  33         diagnose(node, *last_provoker, Diagnostic::INFO, message);
  34 }
  35
  36
  37 void DeclarationValidator::apply(Stage &s, const Features &f)
  38 {
  39         stage = &s;
  40         features = f;
  41         s.content.visit(*this);
  42 }
  43
  44 const char *DeclarationValidator::describe_variable(ScopeType scope)
  45 {
  46         switch(scope)
  47         {
  48         case GLOBAL: return "global variable";
  49         case STRUCT: return "struct member";
  50         case INTERFACE_BLOCK: return "interface block member";
  51         case FUNCTION_PARAM: return "function parameter";
  52         case FUNCTION: return "local variable";
  53         default: return "variable";
  54         }
  55 }
  56
  57 void DeclarationValidator::visit(Layout &layout)
  58 {
  59         bool push_constant = false;
  60         bool binding = false;
  61         for(const Layout::Qualifier &q: layout.qualifiers)
  62         {
  63                 bool allowed = false;
  64                 string err_descr;
  65                 bool value = true;
  66                 if(q.name=="location")
  67                         allowed = (variable && scope==GLOBAL);
  68                 else if(q.name=="binding" || q.name=="set")
  69                 {
  70                         binding = true;
  71
  72                         if(q.name=="set" && features.target_api!=VULKAN)
  73                         {
  74                                 error(layout, "Layout qualifier 'set' not allowed when targeting OpenGL");
  75                                 continue;
  76                         }
  77
  78                         if(variable)
  79                         {
  80                                 const TypeDeclaration *base_type = get_ultimate_base_type(variable->type_declaration);
  81                                 bool uniform = (variable->interface=="uniform");
  82                                 allowed = (scope==GLOBAL && uniform && dynamic_cast<const ImageTypeDeclaration *>(base_type));
  83                                 err_descr = (uniform ? "variable of non-opaque type" : "non-uniform variable");
  84                         }
  85                         else if(iface_block)
  86                         {
  87                                 allowed = (iface_block->interface=="uniform");
  88                                 err_descr = "non-uniform interface block";
  89                         }
  90                 }
  91                 else if(q.name=="constant_id")
  92                 {
  93                         allowed = (variable && scope==GLOBAL);
  94                         if(allowed)
  95                         {
  96                                 if(!variable->constant)
  97                                 {
  98                                         allowed = false;
  99                                         err_descr = "non-constant variable";
 100                                 }
 101                                 else
 102                                 {
 103                                         BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(variable->type_declaration);
 104                                         if(!basic || basic->kind<BasicTypeDeclaration::BOOL || basic->kind>BasicTypeDeclaration::INT)
 105                                         {
 106                                                 allowed = false;
 107                                                 err_descr = format("variable of type '%s'",
 108                                                         (variable->type_declaration ? variable->type_declaration->name : variable->type));
 109                                         }
 110                                 }
 111                         }
 112                 }
 113                 else if(q.name=="offset")
 114                         allowed = (variable && scope==INTERFACE_BLOCK && iface_block->interface=="uniform");
 115                 else if(q.name=="align")
 116                         allowed = (scope==INTERFACE_BLOCK && iface_block->interface=="uniform");
 117                 else if(q.name=="points")
 118                 {
 119                         allowed = (stage->type==Stage::GEOMETRY && iface_layout && (iface_layout->interface=="in" || iface_layout->interface=="out"));
 120                         value = false;
 121                 }
 122                 else if(q.name=="lines" || q.name=="lines_adjacency" || q.name=="triangles" || q.name=="triangles_adjacency")
 123                 {
 124                         allowed = (stage->type==Stage::GEOMETRY && iface_layout && iface_layout->interface=="in");
 125                         value = false;
 126                 }
 127                 else if(q.name=="line_strip" || q.name=="triangle_strip")
 128                 {
 129                         allowed = (stage->type==Stage::GEOMETRY && iface_layout && iface_layout->interface=="out");
 130                         value = false;
 131                 }
 132                 else if(q.name=="invocations")
 133                         allowed = (stage->type==Stage::GEOMETRY && iface_layout && iface_layout->interface=="in");
 134                 else if(q.name=="max_vertices")
 135                         allowed = (stage->type==Stage::GEOMETRY && iface_layout && iface_layout->interface=="out");
 136                 else if(q.name=="std140" || q.name=="std430")
 137                 {
 138                         allowed = (iface_block && !variable && iface_block->interface=="uniform");
 139                         value = false;
 140                 }
 141                 else if(q.name=="column_major" || q.name=="row_major")
 142                 {
 143                         allowed = (variable && scope==INTERFACE_BLOCK);
 144                         if(allowed)
 145                         {
 146                                 BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(variable->type_declaration);
 147                                 while(basic && basic->kind==BasicTypeDeclaration::ARRAY)
 148                                         basic = dynamic_cast<BasicTypeDeclaration *>(basic->base_type);
 149                                 allowed = (basic && basic->kind==BasicTypeDeclaration::MATRIX);
 150                                 err_descr = "non-matrix variable";
 151                         }
 152                 }
 153                 else if(q.name=="push_constant")
 154                 {
 155                         push_constant = true;
 156                         allowed = (iface_block && !variable && iface_block->interface=="uniform");
 157                         value = false;
 158                 }
 159
 160                 if(!allowed)
 161                 {
 162                         if(err_descr.empty())
 163                         {
 164                                 if(variable)
 165                                         err_descr = describe_variable(scope);
 166                                 else if(iface_block)
 167                                         err_descr = "interface block";
 168                                 else if(iface_layout)
 169                                         err_descr = format("interface '%s'", iface_layout->interface);
 170                                 else
 171                                         err_descr = "unknown declaration";
 172                         }
 173                         error(layout, format("Layout qualifier '%s' not allowed on %s", q.name, err_descr));
 174                 }
 175                 else if(value && !q.has_value)
 176                         error(layout, format("Layout qualifier '%s' requires a value", q.name));
 177                 else if(!value && q.has_value)
 178                         error(layout, format("Layout qualifier '%s' does not allow a value", q.name));
 179         }
 180
 181         if(push_constant && binding)
 182                 error(layout, "Layout qualifier 'push_constant' not allowed together with 'binding' or 'set'");
 183 }
 184
 185 void DeclarationValidator::visit(InterfaceLayout &layout)
 186 {
 187         SetForScope<InterfaceLayout *> set_layout(iface_layout, &layout);
 188         TraversingVisitor::visit(layout);
 189 }
 190
 191 void DeclarationValidator::visit(BasicTypeDeclaration &type)
 192 {
 193         BasicTypeDeclaration *basic_base = dynamic_cast<BasicTypeDeclaration *>(type.base_type);
 194         BasicTypeDeclaration::Kind base_kind = (basic_base ? basic_base->kind : BasicTypeDeclaration::VOID);
 195
 196         if(type.kind==BasicTypeDeclaration::VECTOR && (base_kind<BasicTypeDeclaration::BOOL || base_kind>BasicTypeDeclaration::FLOAT))
 197                 error(type, format("Invalid base type '%s' for vector type '%s'", type.base, type.name));
 198         else if(type.kind==BasicTypeDeclaration::MATRIX && base_kind!=BasicTypeDeclaration::VECTOR)
 199                 error(type, format("Invalid base type '%s' for matrix type '%s'", type.base, type.name));
 200         else if(type.kind==BasicTypeDeclaration::ARRAY && basic_base && base_kind==BasicTypeDeclaration::VOID)
 201                 error(type, format("Invalid base type '%s' for array type '%s'", type.base, type.name));
 202 }
 203
 204 void DeclarationValidator::visit(ImageTypeDeclaration &type)
 205 {
 206         BasicTypeDeclaration::Kind base_kind = BasicTypeDeclaration::VOID;
 207         if(BasicTypeDeclaration *basic_base = dynamic_cast<BasicTypeDeclaration *>(type.base_type))
 208                 base_kind = basic_base->kind;
 209         if(base_kind!=BasicTypeDeclaration::INT && base_kind!=BasicTypeDeclaration::FLOAT)
 210                 error(type, format("Invalid base type '%s' for image type '%s'", type.base, type.name));
 211 }
 212
 213 void DeclarationValidator::visit(StructDeclaration &strct)
 214 {
 215         SetForScope<ScopeType> set_scope(scope, (scope!=INTERFACE_BLOCK ? STRUCT : scope));
 216         TraversingVisitor::visit(strct);
 217 }
 218
 219 void DeclarationValidator::visit(VariableDeclaration &var)
 220 {
 221         SetForScope<VariableDeclaration *> set_var(variable, &var);
 222
 223         const char *descr = describe_variable(scope);
 224
 225         if(var.layout)
 226         {
 227                 if(scope!=GLOBAL && scope!=INTERFACE_BLOCK)
 228                         error(var, format("Layout qualifier not allowed on %s", descr));
 229                 else
 230                         var.layout->visit(*this);
 231         }
 232
 233         if(var.constant)
 234         {
 235                 if(scope==STRUCT || scope==INTERFACE_BLOCK)
 236                         error(var, format("Constant qualifier not allowed on %s", descr));
 237                 if(!var.init_expression)
 238                         error(var, "Constant variable must have an initializer");
 239         }
 240
 241         if(!var.interpolation.empty() || !var.sampling.empty())
 242         {
 243                 if(var.interface!="in" && stage->type==Stage::VERTEX)
 244                         error(var, "Interpolation qualifier not allowed on vertex input");
 245                 else if(var.interface!="out" && stage->type==Stage::FRAGMENT)
 246                         error(var, "Interpolation qualifier not allowed on fragment output");
 247                 else if((var.interface!="in" && var.interface!="out") || (scope==FUNCTION_PARAM || scope==FUNCTION))
 248                         error(var, "Interpolation qualifier not allowed on non-interpolated variable");
 249         }
 250
 251         if(!var.interface.empty())
 252         {
 253                 if(iface_block && var.interface!=iface_block->interface)
 254                         error(var, format("Mismatched interface qualifier '%s' inside '%s' block", var.interface, iface_block->interface));
 255                 else if(scope==STRUCT || scope==FUNCTION)
 256                         error(var, format("Interface qualifier not allowed on %s", descr));
 257                 else if(scope==GLOBAL && variable->interface=="uniform" && features.target_api==VULKAN)
 258                 {
 259                         if(!dynamic_cast<const ImageTypeDeclaration *>(get_ultimate_base_type(variable->type_declaration)))
 260                                 error(var, "Interface qualifier 'uniform' not allowed on non-opaque variable in global scope");
 261                 }
 262         }
 263
 264         TypeDeclaration *type = var.type_declaration;
 265         BasicTypeDeclaration::Kind kind = BasicTypeDeclaration::ALIAS;
 266         while(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(type))
 267         {
 268                 kind = basic->kind;
 269                 type = basic->base_type;
 270         }
 271         if(dynamic_cast<ImageTypeDeclaration *>(type))
 272         {
 273                 if(scope!=GLOBAL && scope!=FUNCTION_PARAM)
 274                         error(var, format("Type '%s' not allowed on %s", type->name, descr));
 275                 else if(scope==GLOBAL && var.interface!="uniform")
 276                         error(var, format("Type '%s' only allowed with uniform interface", type->name));
 277         }
 278         else if(kind==BasicTypeDeclaration::VOID)
 279                 error(var, "Type 'void' not allowed on variable");
 280         else if(kind==BasicTypeDeclaration::BOOL && var.source!=BUILTIN_SOURCE)
 281         {
 282                 if(scope==INTERFACE_BLOCK)
 283                         error(var, "Type 'bool' not allowed in an interface block");
 284                 else if(!var.interface.empty())
 285                         error(var, "Type 'bool' not allowed on interface variable");
 286         }
 287
 288         if(var.init_expression)
 289         {
 290                 if(scope==GLOBAL && !var.constant)
 291                         error(var, format("Initializer not allowed on non-constant %s", descr));
 292                 else if(scope!=GLOBAL && scope!=FUNCTION)
 293                         error(var, format("Initializer not allowed on %s", descr));
 294                 else
 295                         var.init_expression->visit(*this);
 296         }
 297 }
 298
 299 void DeclarationValidator::visit(InterfaceBlock &iface)
 300 {
 301         SetForScope<ScopeType> set_scope(scope, INTERFACE_BLOCK);
 302         SetForScope<InterfaceBlock *> set_iface(iface_block, &iface);
 303
 304         if(stage->type==Stage::VERTEX && iface.interface=="in")
 305                 error(iface, "Interface block not allowed on vertex shader input");
 306         else if(stage->type==Stage::FRAGMENT && iface.interface=="out")
 307                 error(iface, "Interface block not allowed on fragment shader output");
 308
 309         TraversingVisitor::visit(iface);
 310         if(iface.struct_declaration)
 311                 iface.struct_declaration->visit(*this);
 312 }
 313
 314 void DeclarationValidator::visit(FunctionDeclaration &func)
 315 {
 316         SetForScope<ScopeType> set_scope(scope, FUNCTION_PARAM);
 317         for(const RefPtr<VariableDeclaration> &p: func.parameters)
 318                 p->visit(*this);
 319         scope = FUNCTION;
 320         func.body.visit(*this);
 321 }
 322
 323
 324 void IdentifierValidator::multiple_definition(const string &name, Statement &statement, Statement &previous)
 325 {
 326         error(statement, format("Multiple definition of %s", name));
 327         add_info(previous, "Previous definition is here");
 328 }
 329
 330 Statement *IdentifierValidator::find_definition(const string &name)
 331 {
 332         BlockDeclarationMap *decls = &declarations[current_block];
 333         auto i = decls->find(name);
 334         if(i==decls->end() && anonymous_block)
 335         {
 336                 decls = &declarations[current_block->parent];
 337                 i = decls->find(name);
 338         }
 339         return (i!=decls->end() ? i->second : 0);
 340 }
 341
 342 void IdentifierValidator::check_definition(const string &name, Statement &statement)
 343 {
 344         if(Statement *previous = find_definition(name))
 345                 multiple_definition(format("'%s'", name), statement, *previous);
 346         else
 347                 record_definition(name, statement);
 348 }
 349
 350 void IdentifierValidator::record_definition(const string &name, Statement &statement)
 351 {
 352         declarations[current_block].insert(make_pair(name, &statement));
 353         if(anonymous_block)
 354                 declarations[current_block->parent].insert(make_pair(name, &statement));
 355 }
 356
 357 void IdentifierValidator::visit(TypeDeclaration &type)
 358 {
 359         check_definition(type.name, type);
 360 }
 361
 362 void IdentifierValidator::visit(StructDeclaration &strct)
 363 {
 364         check_definition(strct.name, strct);
 365         TraversingVisitor::visit(strct);
 366 }
 367
 368 void IdentifierValidator::visit(VariableDeclaration &var)
 369 {
 370         check_definition(var.name, var);
 371         TraversingVisitor::visit(var);
 372 }
 373
 374 void IdentifierValidator::visit(InterfaceBlock &iface)
 375 {
 376         string key = format("%s %s", iface.interface, iface.block_name);
 377         auto i = interface_blocks.find(key);
 378         if(i!=interface_blocks.end())
 379                 multiple_definition(format("interface block '%s %s'", iface.interface, iface.block_name), iface, *i->second);
 380         else
 381                 interface_blocks.insert(make_pair(key, &iface));
 382
 383         if(Statement *previous = find_definition(iface.block_name))
 384         {
 385                 if(!dynamic_cast<InterfaceBlock *>(previous))
 386                         multiple_definition(format("'%s'", iface.block_name), iface, *previous);
 387         }
 388         else
 389                 record_definition(iface.block_name, iface);
 390
 391         if(!iface.instance_name.empty())
 392                 check_definition(iface.instance_name, iface);
 393
 394         if(iface.instance_name.empty() && iface.struct_declaration)
 395         {
 396                 // Inject anonymous interface block members into the global scope
 397                 for(const auto &kvp: iface.struct_declaration->members.variables)
 398                         check_definition(kvp.first, *kvp.second);
 399         }
 400 }
 401
 402 void IdentifierValidator::visit(FunctionDeclaration &func)
 403 {
 404         string key = func.name+func.signature;
 405         auto i = overloaded_functions.find(key);
 406         if(i==overloaded_functions.end())
 407                 overloaded_functions.insert(make_pair(key, &func));
 408         else if(func.return_type_declaration && i->second->return_type_declaration!=func.return_type_declaration)
 409         {
 410                 error(func, format("Conflicting return type '%s' for function '%s'", func.return_type_declaration->name, func.name));
 411                 if(i->second->return_type_declaration)
 412                         add_info(*i->second, format("Previously declared as returning '%s'", i->second->return_type_declaration->name));
 413         }
 414
 415         if(Statement *previous = find_definition(func.name))
 416         {
 417                 if(!dynamic_cast<FunctionDeclaration *>(previous))
 418                         multiple_definition(format("'%s'", func.name), func, *previous);
 419         }
 420         else
 421                 record_definition(func.name, func);
 422
 423         if(func.definition==&func)
 424                 check_definition(func.name+func.signature, func);
 425
 426         TraversingVisitor::visit(func);
 427 }
 428
 429
 430 void ReferenceValidator::visit(BasicTypeDeclaration &type)
 431 {
 432         if(!type.base.empty() && !type.base_type)
 433                 error(type, format("Use of undeclared type '%s'", type.base));
 434 }
 435
 436 void ReferenceValidator::visit(ImageTypeDeclaration &type)
 437 {
 438         if(!type.base.empty() && !type.base_type)
 439                 error(type, format("Use of undeclared type '%s'", type.base));
 440 }
 441
 442 void ReferenceValidator::visit(VariableReference &var)
 443 {
 444         if(!var.declaration)
 445                 error(var, format("Use of undeclared variable '%s'", var.name));
 446         else if(stage->type!=Stage::VERTEX && var.declaration->interface=="in" && var.name.compare(0, 3, "gl_") && !var.declaration->linked_declaration)
 447                 error(var, format("Use of unlinked input variable '%s'", var.name));
 448 }
 449
 450 void ReferenceValidator::visit(MemberAccess &memacc)
 451 {
 452         if(memacc.left->type && !memacc.declaration)
 453                 error(memacc, format("Use of undeclared member '%s'", memacc.member));
 454         TraversingVisitor::visit(memacc);
 455 }
 456
 457 void ReferenceValidator::visit(InterfaceBlockReference &iface)
 458 {
 459         /* An interface block reference without a declaration should be impossible
 460         since references are generated based on existing declarations. */
 461         if(!iface.declaration)
 462                 error(iface, format("Use of undeclared interface block '%s'", iface.name));
 463         else if(stage->type!=Stage::VERTEX && iface.declaration->interface=="in" && !iface.declaration->linked_block)
 464                 error(iface, format("Use of unlinked input block '%s'", iface.name));
 465 }
 466
 467 void ReferenceValidator::visit(FunctionCall &call)
 468 {
 469         if((!call.constructor && !call.declaration) || (call.constructor && !call.type))
 470         {
 471                 bool have_declaration = call.constructor;
 472                 if(!call.constructor)
 473                 {
 474                         auto i = stage->functions.lower_bound(call.name);
 475                         have_declaration = (i!=stage->functions.end() && i->second->name==call.name);
 476                 }
 477
 478                 if(have_declaration)
 479                 {
 480                         bool valid_types = true;
 481                         string signature;
 482                         for(auto j=call.arguments.begin(); (valid_types && j!=call.arguments.end()); ++j)
 483                         {
 484                                 if((*j)->type)
 485                                         append(signature, ", ", (*j)->type->name);
 486                                 else
 487                                         valid_types = false;
 488                         }
 489
 490                         if(valid_types)
 491                                 error(call, format("No matching %s found for '%s(%s)'", (call.constructor ? "constructor" : "overload"), call.name, signature));
 492                 }
 493                 else
 494                         error(call, format("Call to undeclared function '%s'", call.name));
 495         }
 496         TraversingVisitor::visit(call);
 497 }
 498
 499 void ReferenceValidator::visit(VariableDeclaration &var)
 500 {
 501         if(!var.type_declaration)
 502                 error(var, format("Use of undeclared type '%s'", var.type));
 503         TraversingVisitor::visit(var);
 504 }
 505
 506 void ReferenceValidator::visit(InterfaceBlock &iface)
 507 {
 508         if(!iface.struct_declaration)
 509                 error(iface, format("Interface block '%s %s' lacks a struct declaration", iface.interface, iface.block_name));
 510         TraversingVisitor::visit(iface);
 511 }
 512
 513 void ReferenceValidator::visit(FunctionDeclaration &func)
 514 {
 515         if(!func.return_type_declaration)
 516                 error(func, format("Use of undeclared type '%s'", func.return_type));
 517         TraversingVisitor::visit(func);
 518 }
 519
 520
 521 void ExpressionValidator::visit(VariableReference &var)
 522 {
 523         if(var.declaration && constant_expression)
 524         {
 525                 if(!var.declaration->constant)
 526                         error(var, format("Reference to non-constant variable '%s' in a constant expression", var.name));
 527                 else if(var.declaration->layout && constant_expression==FIXED_CONSTANT)
 528                 {
 529                         if(has_layout_qualifier(var.declaration->layout.get(), "constant_id"))
 530                                 error(var, format("Reference to specialization constant '%s' in a fixed constant expression", var.name));
 531                 }
 532         }
 533 }
 534
 535 void ExpressionValidator::visit(InterfaceBlockReference &iface)
 536 {
 537         if(constant_expression)
 538                 error(iface, format("Reference to interface block '%s' in a constant expression", iface.name));
 539 }
 540
 541 void ExpressionValidator::visit(Swizzle &swizzle)
 542 {
 543         unsigned size = 0;
 544         if(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(swizzle.left->type))
 545         {
 546                 if(basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT)
 547                         size = 1;
 548                 else if(basic->kind==BasicTypeDeclaration::VECTOR)
 549                         size = basic->size;
 550         }
 551
 552         if(size)
 553         {
 554                 static const char component_names[] = { 'x', 'y', 'z', 'w', 'r', 'g', 'b', 'a', 's', 't', 'p', 'q' };
 555                 int flavour = -1;
 556                 for(unsigned i=0; i<swizzle.count; ++i)
 557                 {
 558                         unsigned component_flavour = (std::find(component_names, component_names+12, swizzle.component_group[i])-component_names)/4;
 559                         if(flavour==-1)
 560                                 flavour = component_flavour;
 561                         else if(flavour>=0 && component_flavour!=static_cast<unsigned>(flavour))
 562                         {
 563                                 error(swizzle, format("Flavour of swizzle component '%c' is inconsistent with '%c'",
 564                                         swizzle.component_group[i], swizzle.component_group[0]));
 565                                 flavour = -2;
 566                         }
 567
 568                         if(swizzle.components[i]>=size)
 569                                 error(swizzle, format("Access to component '%c' which is not present in '%s'",
 570                                         swizzle.component_group[i], swizzle.left->type->name));
 571                 }
 572         }
 573         else if(swizzle.left->type)
 574                 error(swizzle, format("Swizzle applied to '%s' which is neither a scalar nor a vector", swizzle.left->type->name));
 575
 576         TraversingVisitor::visit(swizzle);
 577 }
 578
 579 void ExpressionValidator::visit(UnaryExpression &unary)
 580 {
 581         if(unary.expression->type)
 582         {
 583                 if(!unary.type)
 584                         error(unary, format("No matching operator '%s' found for '%s'", unary.oper->token, unary.expression->type->name));
 585                 else if(unary.oper->token[1]=='+' || unary.oper->token[1]=='-')
 586                 {
 587                         if(constant_expression)
 588                                 error(unary, format("Use of '%s' in a constant expression", unary.oper->token));
 589                         else if(!unary.expression->lvalue)
 590                                 error(unary, format("Operand of '%s' is not an lvalue", unary.oper->token));
 591                 }
 592         }
 593         TraversingVisitor::visit(unary);
 594 }
 595
 596 void ExpressionValidator::visit(BinaryExpression &binary)
 597 {
 598         if(!binary.type && binary.left->type && binary.right->type)
 599         {
 600                 if(binary.oper->token[0]=='[')
 601                         error(binary, format("Can't index element of '%s' with '%s'",
 602                                 binary.left->type->name, binary.right->type->name));
 603                 else
 604                         error(binary, format("No matching operator '%s' found for '%s' and '%s'",
 605                                 binary.oper->token, binary.left->type->name, binary.right->type->name));
 606         }
 607         TraversingVisitor::visit(binary);
 608 }
 609
 610 void ExpressionValidator::visit(Assignment &assign)
 611 {
 612         if(assign.left->type)
 613         {
 614                 if(constant_expression)
 615                         error(assign, "Assignment in constant expression");
 616                 else if(!assign.left->lvalue)
 617                         error(assign, "Target of assignment is not an lvalue");
 618                 if(assign.right->type)
 619                 {
 620                         if(assign.oper->token[0]!='=')
 621                         {
 622                                 if(!assign.type)
 623                                         error(assign, format("No matching operator '%s' found for '%s' and '%s'",
 624                                                 string(assign.oper->token, strlen(assign.oper->token)-1), assign.left->type->name, assign.right->type->name));
 625                         }
 626                         else if(assign.left->type!=assign.right->type)
 627                                 error(assign, format("Assignment to variable of type '%s' from expression of incompatible type '%s'",
 628                                         assign.left->type->name, assign.right->type->name));
 629                 }
 630         }
 631         TraversingVisitor::visit(assign);
 632 }
 633
 634 void ExpressionValidator::visit(TernaryExpression &ternary)
 635 {
 636         if(ternary.condition->type)
 637         {
 638                 BasicTypeDeclaration *basic_cond = dynamic_cast<BasicTypeDeclaration *>(ternary.condition->type);
 639                 if(!basic_cond || basic_cond->kind!=BasicTypeDeclaration::BOOL)
 640                         error(ternary, "Ternary operator condition is not a boolean");
 641                 else if(!ternary.type && ternary.true_expr->type && ternary.false_expr->type)
 642                         error(ternary, format("Ternary operator has incompatible types '%s' and '%s'",
 643                                 ternary.true_expr->type->name, ternary.false_expr->type->name));
 644         }
 645         TraversingVisitor::visit(ternary);
 646 }
 647
 648 void ExpressionValidator::visit(StructDeclaration &strct)
 649 {
 650         SetFlag set_struct(in_struct);
 651         TraversingVisitor::visit(strct);
 652 }
 653
 654 void ExpressionValidator::visit(VariableDeclaration &var)
 655 {
 656         if(var.init_expression && var.init_expression->type && var.type_declaration && var.init_expression->type!=var.type_declaration)
 657                 error(var, format("Initializing a variable of type '%s' with an expression of incompatible type '%s'",
 658                         var.type_declaration->name, var.init_expression->type->name));
 659
 660         if(var.layout)
 661                 var.layout->visit(*this);
 662         if(var.init_expression)
 663         {
 664                 ConstantKind const_kind = (!var.constant ? NOT_CONSTANT :
 665                         has_layout_qualifier(var.layout.get(), "constant_id") ? FIXED_CONSTANT : SPEC_CONSTANT);
 666
 667                 SetForScope<ConstantKind> set_const(constant_expression, const_kind);
 668                 TraversingVisitor::visit(var.init_expression);
 669         }
 670         if(var.array_size)
 671         {
 672                 SetForScope<ConstantKind> set_const(constant_expression, (in_struct || !var.interface.empty() ? FIXED_CONSTANT : SPEC_CONSTANT));
 673                 TraversingVisitor::visit(var.array_size);
 674         }
 675 }
 676
 677 void ExpressionValidator::visit(FunctionDeclaration &func)
 678 {
 679         SetForScope<FunctionDeclaration *> set_func(current_function, &func);
 680         TraversingVisitor::visit(func);
 681 }
 682
 683 void ExpressionValidator::visit(Conditional &cond)
 684 {
 685         if(cond.condition->type)
 686         {
 687                 BasicTypeDeclaration *basic_cond = dynamic_cast<BasicTypeDeclaration *>(cond.condition->type);
 688                 if(!basic_cond || basic_cond->kind!=BasicTypeDeclaration::BOOL)
 689                         error(cond, "Condition is not a boolean");
 690         }
 691         TraversingVisitor::visit(cond);
 692 }
 693
 694 void ExpressionValidator::visit(Iteration &iter)
 695 {
 696         if(iter.condition->type)
 697         {
 698                 BasicTypeDeclaration *basic_cond = dynamic_cast<BasicTypeDeclaration *>(iter.condition->type);
 699                 if(!basic_cond || basic_cond->kind!=BasicTypeDeclaration::BOOL)
 700                         error(iter, "Loop condition is not a boolean");
 701         }
 702         TraversingVisitor::visit(iter);
 703 }
 704
 705 void ExpressionValidator::visit(Return &ret)
 706 {
 707         if(current_function && current_function->return_type_declaration)
 708         {
 709                 TypeDeclaration *return_type = current_function->return_type_declaration;
 710                 BasicTypeDeclaration *basic_return = dynamic_cast<BasicTypeDeclaration *>(return_type);
 711                 if(ret.expression)
 712                 {
 713                         if(ret.expression->type && ret.expression->type!=return_type)
 714                                 error(ret, format("Return expression type '%s' is incompatible with declared return type '%s'",
 715                                         ret.expression->type->name, return_type->name));
 716                 }
 717                 else if(!basic_return || basic_return->kind!=BasicTypeDeclaration::VOID)
 718                         error(ret, "Return statement without an expression in a function not returning 'void'");
 719         }
 720
 721         TraversingVisitor::visit(ret);
 722 }
 723
 724
 725 void FlowControlValidator::visit(Block &block)
 726 {
 727         for(const RefPtr<Statement> &s: block.body)
 728         {
 729                 if(!reachable)
 730                 {
 731                         diagnose(*s, Diagnostic::WARN, "Unreachable code detected");
 732                         break;
 733                 }
 734                 s->visit(*this);
 735         }
 736 }
 737
 738 void FlowControlValidator::visit(FunctionDeclaration &func)
 739 {
 740         func.body.visit(*this);
 741
 742         if(func.definition==&func && func.return_type_declaration)
 743         {
 744                 const BasicTypeDeclaration *basic_ret = dynamic_cast<const BasicTypeDeclaration *>(func.return_type_declaration);
 745                 if(reachable && (!basic_ret || basic_ret->kind!=BasicTypeDeclaration::VOID))
 746                         error(func, "Missing return statement at the end of a function not returning 'void'");
 747         }
 748         reachable = true;
 749 }
 750
 751 void FlowControlValidator::visit(Conditional &cond)
 752 {
 753         cond.body.visit(*this);
 754         bool reachable_if_true = reachable;
 755         reachable = true;
 756         cond.else_body.visit(*this);
 757         reachable |= reachable_if_true;
 758 }
 759
 760 void FlowControlValidator::visit(Iteration &iter)
 761 {
 762         iter.body.visit(*this);
 763         reachable = true;
 764 }
 765
 766
 767 void StageInterfaceValidator::visit(VariableDeclaration &var)
 768 {
 769         int location = get_layout_value(var.layout.get(), "location");
 770         if(var.interface=="in" && var.linked_declaration)
 771         {
 772                 const Layout *linked_layout = var.linked_declaration->layout.get();
 773                 int linked_location = get_layout_value(linked_layout, "location");
 774                 if(linked_location!=location)
 775                 {
 776                         error(var, format("Mismatched location %d for 'in %s'", location, var.name));
 777                         add_info(*var.linked_declaration, format("Linked to 'out %s' with location %d",
 778                                 var.linked_declaration->name, linked_location));
 779                 }
 780                 if(var.type_declaration && var.linked_declaration->type_declaration)
 781                 {
 782                         TypeDeclaration *type = var.type_declaration;
 783                         if(stage->type==Stage::GEOMETRY)
 784                         {
 785                                 if(const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(type))
 786                                         if(basic->kind==BasicTypeDeclaration::ARRAY && basic->base_type)
 787                                                 type = basic->base_type;
 788                         }
 789                         if(!TypeComparer().apply(*type, *var.linked_declaration->type_declaration))
 790                         {
 791                                 error(var, format("Mismatched type '%s' for 'in %s'", type->name, var.name));
 792                                 add_info(*var.linked_declaration, format("Linked to 'out %s' with type '%s'",
 793                                         var.linked_declaration->name, var.linked_declaration->type_declaration->name));
 794                         }
 795                 }
 796         }
 797
 798         if(location>=0 && !var.interface.empty())
 799         {
 800                 map<unsigned, VariableDeclaration *> &used = used_locations[var.interface];
 801
 802                 unsigned loc_count = LocationCounter().apply(var);
 803                 for(unsigned i=0; i<loc_count; ++i)
 804                 {
 805                         auto j = used.find(location+i);
 806                         if(j!=used.end())
 807                         {
 808                                 error(var, format("Overlapping location %d for '%s %s'", location+i, var.interface, var.name));
 809                                 add_info(*j->second, format("Previously used here for '%s %s'", j->second->interface, j->second->name));
 810                         }
 811                         else
 812                                 used[location+i] = &var;
 813                 }
 814         }
 815 }
 816
 817
 818 void GlobalInterfaceValidator::apply(Module &module)
 819 {
 820         for(Stage &s: module.stages)
 821         {
 822                 stage = &s;
 823                 s.content.visit(*this);
 824         }
 825 }
 826
 827 void GlobalInterfaceValidator::check_uniform(const Uniform &uni)
 828 {
 829         auto i = used_names.find(uni.name);
 830         if(i!=used_names.end())
 831         {
 832                 if(uni.location>=0 && i->second->location>=0 && i->second->location!=uni.location)
 833                 {
 834                         error(*uni.node, format("Mismatched location %d for uniform '%s'", uni.location, uni.name));
 835                         add_info(*i->second->node, format("Previously declared here with location %d", i->second->location));
 836                 }
 837                 if(i->second->desc_set!=uni.desc_set)
 838                 {
 839                         error(*uni.node, format("Mismatched descriptor set %d for uniform '%s'", uni.desc_set, uni.name));
 840                         add_info(*i->second->node, format("Previously declared here with descriptor set %d", i->second->desc_set));
 841                 }
 842                 if(uni.bind_point>=0 && i->second->bind_point>=0 && i->second->bind_point!=uni.bind_point)
 843                 {
 844                         error(*uni.node, format("Mismatched binding %d for uniform '%s'", uni.bind_point, uni.name));
 845                         add_info(*i->second->node, format("Previously declared here with binding %d", i->second->bind_point));
 846                 }
 847                 if(uni.type && i->second->type && !TypeComparer().apply(*uni.type, *i->second->type))
 848                 {
 849                         string type_name = (dynamic_cast<const StructDeclaration *>(uni.type) ?
 850                                 "structure" : format("type '%s'", uni.type->name));
 851                         error(*uni.node, format("Mismatched %s for uniform '%s'", type_name, uni.name));
 852
 853                         string message = "Previously declared here";
 854                         if(!dynamic_cast<const StructDeclaration *>(i->second->type))
 855                                 message += format(" with type '%s'", i->second->type->name);
 856                         add_info(*i->second->node, message);
 857                 }
 858         }
 859         else
 860                 used_names.insert(make_pair(uni.name, &uni));
 861
 862         if(uni.location>=0)
 863         {
 864                 auto j = used_locations.find(uni.location);
 865                 if(j!=used_locations.end())
 866                 {
 867                         if(j->second->name!=uni.name)
 868                         {
 869                                 error(*uni.node, format("Overlapping location %d for '%s'", uni.location, uni.name));
 870                                 add_info(*j->second->node, format("Previously used here for '%s'", j->second->name));
 871                         }
 872                 }
 873                 else
 874                 {
 875                         for(unsigned k=0; k<uni.loc_count; ++k)
 876                                 used_locations.insert(make_pair(uni.location+k, &uni));
 877                 }
 878         }
 879
 880         if(uni.bind_point>=0)
 881         {
 882                 map<unsigned, const Uniform *> &used = used_bindings[uni.desc_set];
 883                 auto j = used.find(uni.bind_point);
 884                 if(j!=used.end())
 885                 {
 886                         if(j->second->name!=uni.name)
 887                         {
 888                                 error(*uni.node, format("Overlapping binding %d for '%s'", uni.bind_point, uni.name));
 889                                 add_info(*j->second->node, format("Previously used here for '%s'", j->second->name));
 890                         }
 891                 }
 892                 else
 893                         used.insert(make_pair(uni.bind_point, &uni));
 894         }
 895 }
 896
 897 void GlobalInterfaceValidator::visit(VariableDeclaration &var)
 898 {
 899         if(var.interface=="uniform")
 900         {
 901                 Uniform uni;
 902                 uni.node = &var;
 903                 uni.type = var.type_declaration;
 904                 uni.name = var.name;
 905                 if(var.layout)
 906                 {
 907                         uni.location = get_layout_value(var.layout.get(), "location");
 908                         uni.loc_count = LocationCounter().apply(var);
 909                         uni.desc_set = get_layout_value(var.layout.get(), "set", 0);
 910                         uni.bind_point = get_layout_value(var.layout.get(), "binding");
 911                 }
 912
 913                 uniforms.push_back(uni);
 914                 check_uniform(uniforms.back());
 915         }
 916 }
 917
 918 void GlobalInterfaceValidator::visit(InterfaceBlock &iface)
 919 {
 920         if(iface.interface=="uniform")
 921         {
 922                 Uniform uni;
 923                 uni.node = &iface;
 924                 uni.type = iface.struct_declaration;
 925                 uni.name = iface.block_name;
 926                 if(iface.layout)
 927                 {
 928                         uni.desc_set = get_layout_value(iface.layout.get(), "set", 0);
 929                         uni.bind_point = get_layout_value(iface.layout.get(), "binding");
 930                 }
 931
 932                 uniforms.push_back(uni);
 933                 check_uniform(uniforms.back());
 934         }
 935 }
 936
 937 } // namespace SL
 938 } // namespace GL
 939 } // namespace Msp