source/glsl/validate.cpp

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