+bool VariableResolver::apply(Stage &s)
+{
+ stage = &s;
+ s.interface_blocks.clear();
+ r_any_resolved = false;
+ s.content.visit(*this);
+ for(vector<VariableDeclaration *>::const_iterator i=redeclared_builtins.begin(); i!=redeclared_builtins.end(); ++i)
+ (*i)->source = GENERATED_SOURCE;
+ NodeRemover().apply(s, nodes_to_remove);
+ return r_any_resolved;
+}
+
+void VariableResolver::enter(Block &block)
+{
+ block.variables.clear();
+}
+
+void VariableResolver::visit(RefPtr<Expression> &expr)
+{
+ r_replacement_expr = 0;
+ expr->visit(*this);
+ if(r_replacement_expr)
+ {
+ expr = r_replacement_expr;
+ /* Don't record assignment target when doing a replacement, because chain
+ information won't be correct. */
+ r_assignment_target.declaration = 0;
+ r_any_resolved = true;
+ }
+ r_replacement_expr = 0;
+}
+
+void VariableResolver::check_assignment_target(Statement *declaration)
+{
+ if(record_target)
+ {
+ if(r_assignment_target.declaration)
+ {
+ /* More than one reference found in assignment target. Unable to
+ determine what the primary target is. */
+ record_target = false;
+ r_assignment_target.declaration = 0;
+ }
+ else
+ r_assignment_target.declaration = declaration;
+ }
+ // TODO This check is overly broad and may prevent some optimizations.
+ else if(declaration && declaration==r_assignment_target.declaration)
+ r_self_referencing = true;
+}
+
+void VariableResolver::visit(VariableReference &var)
+{
+ VariableDeclaration *declaration = 0;
+
+ /* Look for variable declarations in the block hierarchy first. Interface
+ blocks are always defined in the top level so we can't accidentally skip
+ one. */
+ for(Block *block=current_block; (!declaration && block); block=block->parent)
+ {
+ map<string, VariableDeclaration *>::iterator i = block->variables.find(var.name);
+ if(i!=block->variables.end())
+ declaration = i->second;
+ }
+
+ if(!declaration)
+ {
+ const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
+ map<string, InterfaceBlock *>::const_iterator i = blocks.find("_"+var.name);
+ if(i!=blocks.end())
+ {
+ /* The name refers to an interface block with an instance name rather
+ than a variable. Prepare a new syntax tree node accordingly. */
+ InterfaceBlockReference *iface_ref = new InterfaceBlockReference;
+ iface_ref->source = var.source;
+ iface_ref->line = var.line;
+ iface_ref->name = var.name;
+ iface_ref->declaration = i->second;
+ r_replacement_expr = iface_ref;
+ }
+ else
+ {
+ // Look for the variable in anonymous interface blocks.
+ for(i=blocks.begin(); (!declaration && i!=blocks.end()); ++i)
+ if(i->second->instance_name.empty() && i->second->struct_declaration)
+ {
+ const map<string, VariableDeclaration *> &iface_vars = i->second->struct_declaration->members.variables;
+ map<string, VariableDeclaration *>::const_iterator j = iface_vars.find(var.name);
+ if(j!=iface_vars.end())
+ declaration = j->second;
+ }
+ }
+ }
+
+ r_any_resolved |= (declaration!=var.declaration);
+ var.declaration = declaration;
+
+ check_assignment_target(var.declaration);
+}
+
+void VariableResolver::visit(InterfaceBlockReference &iface)
+{
+ map<string, InterfaceBlock *>::iterator i = stage->interface_blocks.find("_"+iface.name);
+ InterfaceBlock *declaration = (i!=stage->interface_blocks.end() ? i->second : 0);
+ r_any_resolved |= (declaration!=iface.declaration);
+ iface.declaration = declaration;
+
+ check_assignment_target(iface.declaration);
+}
+
+void VariableResolver::add_to_chain(Assignment::Target::ChainType type, unsigned index)
+{
+ if(r_assignment_target.chain_len<7)
+ r_assignment_target.chain[r_assignment_target.chain_len] = type | min<unsigned>(index, 0x3F);
+ ++r_assignment_target.chain_len;
+}
+
+void VariableResolver::visit(MemberAccess &memacc)
+{
+ TraversingVisitor::visit(memacc);
+
+ VariableDeclaration *declaration = 0;
+ if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(memacc.left->type))
+ {
+ map<string, VariableDeclaration *>::iterator i = strct->members.variables.find(memacc.member);
+ if(i!=strct->members.variables.end())
+ {
+ declaration = i->second;
+
+ if(record_target)
+ {
+ unsigned index = 0;
+ for(NodeList<Statement>::const_iterator j=strct->members.body.begin(); (j!=strct->members.body.end() && j->get()!=i->second); ++j)
+ ++index;
+
+ add_to_chain(Assignment::Target::MEMBER, index);
+ }
+ }
+ }
+ else if(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(memacc.left->type))
+ {
+ bool scalar_swizzle = ((basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT) && memacc.member.size()==1);
+ bool vector_swizzle = (basic->kind==BasicTypeDeclaration::VECTOR && memacc.member.size()<=4);
+ if(scalar_swizzle || vector_swizzle)
+ {
+ static const char component_names[] = { 'x', 'r', 's', 'y', 'g', 't', 'z', 'b', 'p', 'w', 'a', 'q' };
+
+ bool ok = true;
+ UInt8 components[4] = { };
+ for(unsigned i=0; (ok && i<memacc.member.size()); ++i)
+ ok = ((components[i] = (find(component_names, component_names+12, memacc.member[i])-component_names)/3) < 4);
+
+ if(ok)
+ {
+ Swizzle *swizzle = new Swizzle;
+ swizzle->source = memacc.source;
+ swizzle->line = memacc.line;
+ swizzle->oper = memacc.oper;
+ swizzle->left = memacc.left;
+ swizzle->component_group = memacc.member;
+ swizzle->count = memacc.member.size();
+ copy(components, components+memacc.member.size(), swizzle->components);
+ r_replacement_expr = swizzle;
+ }
+ }
+ }
+
+ r_any_resolved |= (declaration!=memacc.declaration);
+ memacc.declaration = declaration;
+}
+
+void VariableResolver::visit(Swizzle &swizzle)
+{
+ TraversingVisitor::visit(swizzle);
+
+ if(record_target)
+ {
+ unsigned mask = 0;
+ for(unsigned i=0; i<swizzle.count; ++i)
+ mask |= 1<<swizzle.components[i];
+ add_to_chain(Assignment::Target::SWIZZLE, mask);
+ }
+}
+
+void VariableResolver::visit(BinaryExpression &binary)
+{
+ if(binary.oper->token[0]=='[')
+ {
+ {
+ /* The subscript expression is not a part of the primary assignment
+ target. */
+ SetFlag set(record_target, false);
+ visit(binary.right);
+ }
+ visit(binary.left);
+
+ if(record_target)
+ {
+ unsigned index = 0x3F;
+ if(Literal *literal_subscript = dynamic_cast<Literal *>(binary.right.get()))
+ if(literal_subscript->value.check_type<int>())
+ index = literal_subscript->value.value<int>();
+ add_to_chain(Assignment::Target::ARRAY, index);
+ }
+ }
+ else
+ TraversingVisitor::visit(binary);
+}
+
+void VariableResolver::visit(Assignment &assign)
+{
+ {
+ SetFlag set(record_target);
+ r_assignment_target = Assignment::Target();
+ visit(assign.left);
+ r_any_resolved |= (r_assignment_target<assign.target || assign.target<r_assignment_target);
+ assign.target = r_assignment_target;
+ }
+
+ r_self_referencing = false;
+ visit(assign.right);
+ assign.self_referencing = (r_self_referencing || assign.oper->token[0]!='=');
+}
+
+void VariableResolver::merge_layouts(Layout &to_layout, const Layout &from_layout)
+{
+ for(vector<Layout::Qualifier>::const_iterator i=from_layout.qualifiers.begin(); i!=from_layout.qualifiers.end(); ++i)
+ {
+ bool found = false;
+ for(vector<Layout::Qualifier>::iterator j=to_layout.qualifiers.begin(); (!found && j!=to_layout.qualifiers.end()); ++j)
+ if(j->name==i->name)
+ {
+ j->has_value = i->value;
+ j->value = i->value;
+ found = true;
+ }
+
+ if(!found)
+ to_layout.qualifiers.push_back(*i);
+ }
+}
+
+void VariableResolver::visit(VariableDeclaration &var)
+{
+ TraversingVisitor::visit(var);
+ VariableDeclaration *&ptr = current_block->variables[var.name];
+ if(!ptr)
+ ptr = &var;
+ else if(!current_block->parent && ptr->interface==var.interface && ptr->type==var.type)
+ {
+ if(ptr->source==BUILTIN_SOURCE)
+ redeclared_builtins.push_back(&var);
+ else
+ stage->diagnostics.push_back(Diagnostic(Diagnostic::WARN, var.source, var.line,
+ format("Redeclaring non-builtin variable '%s' is deprecated", var.name)));
+
+ if(var.init_expression)
+ ptr->init_expression = var.init_expression;
+ if(var.layout)
+ {
+ if(ptr->layout)
+ merge_layouts(*ptr->layout, *var.layout);
+ else
+ ptr->layout = var.layout;
+ }
+ nodes_to_remove.insert(&var);
+
+ r_any_resolved = true;
+ }
+}
+
+void VariableResolver::visit(InterfaceBlock &iface)
+{
+ /* Block names can be reused in different interfaces. Prefix the name with
+ the first character of the interface to avoid conflicts. */
+ stage->interface_blocks.insert(make_pair(iface.interface+iface.name, &iface));
+ if(!iface.instance_name.empty())
+ stage->interface_blocks.insert(make_pair("_"+iface.instance_name, &iface));
+
+ TraversingVisitor::visit(iface);
+}
+
+
+ExpressionResolver::ExpressionResolver():
+ stage(0),
+ r_any_resolved(false)
+{ }
+
+bool ExpressionResolver::apply(Stage &s)
+{
+ stage = &s;
+ r_any_resolved = false;
+ s.content.visit(*this);
+ return r_any_resolved;
+}
+
+bool ExpressionResolver::is_scalar(BasicTypeDeclaration &type)
+{
+ return (type.kind==BasicTypeDeclaration::INT || type.kind==BasicTypeDeclaration::FLOAT);
+}
+
+bool ExpressionResolver::is_vector_or_matrix(BasicTypeDeclaration &type)
+{
+ return (type.kind==BasicTypeDeclaration::VECTOR || type.kind==BasicTypeDeclaration::MATRIX);
+}
+
+BasicTypeDeclaration *ExpressionResolver::get_element_type(BasicTypeDeclaration &type)
+{
+ if(is_vector_or_matrix(type) || type.kind==BasicTypeDeclaration::ARRAY)
+ {
+ BasicTypeDeclaration *basic_base = dynamic_cast<BasicTypeDeclaration *>(type.base_type);
+ return (basic_base ? get_element_type(*basic_base) : 0);
+ }
+ else
+ return &type;
+}
+
+bool ExpressionResolver::can_convert(BasicTypeDeclaration &from, BasicTypeDeclaration &to)
+{
+ if(from.kind==BasicTypeDeclaration::INT && to.kind==BasicTypeDeclaration::FLOAT)
+ return from.size<=to.size;
+ else if(from.kind!=to.kind)
+ return false;
+ else if((from.kind==BasicTypeDeclaration::VECTOR || from.kind==BasicTypeDeclaration::MATRIX) && from.size==to.size)
+ {
+ BasicTypeDeclaration *from_base = dynamic_cast<BasicTypeDeclaration *>(from.base_type);
+ BasicTypeDeclaration *to_base = dynamic_cast<BasicTypeDeclaration *>(to.base_type);
+ return (from_base && to_base && can_convert(*from_base, *to_base));
+ }
+ else
+ return false;
+}
+
+ExpressionResolver::Compatibility ExpressionResolver::get_compatibility(BasicTypeDeclaration &left, BasicTypeDeclaration &right)
+{
+ if(&left==&right)
+ return SAME_TYPE;
+ else if(can_convert(left, right))
+ return LEFT_CONVERTIBLE;
+ else if(can_convert(right, left))
+ return RIGHT_CONVERTIBLE;
+ else
+ return NOT_COMPATIBLE;
+}
+
+BasicTypeDeclaration *ExpressionResolver::find_type(BasicTypeDeclaration::Kind kind, unsigned size)
+{
+ for(vector<BasicTypeDeclaration *>::const_iterator i=basic_types.begin(); i!=basic_types.end(); ++i)
+ if((*i)->kind==kind && (*i)->size==size)
+ return *i;
+ return 0;
+}
+
+BasicTypeDeclaration *ExpressionResolver::find_type(BasicTypeDeclaration &elem_type, BasicTypeDeclaration::Kind kind, unsigned size)
+{
+ for(vector<BasicTypeDeclaration *>::const_iterator i=basic_types.begin(); i!=basic_types.end(); ++i)
+ if(get_element_type(**i)==&elem_type && (*i)->kind==kind && (*i)->size==size)
+ return *i;
+ return 0;
+}
+
+void ExpressionResolver::convert_to(RefPtr<Expression> &expr, BasicTypeDeclaration &type)
+{
+ RefPtr<FunctionCall> call = new FunctionCall;
+ call->name = type.name;
+ call->constructor = true;
+ call->arguments.push_back(0);
+ call->arguments.back() = expr;
+ call->type = &type;
+ expr = call;
+}
+
+bool ExpressionResolver::convert_to_element(RefPtr<Expression> &expr, BasicTypeDeclaration &elem_type)
+{
+ if(BasicTypeDeclaration *expr_basic = dynamic_cast<BasicTypeDeclaration *>(expr->type))
+ {
+ BasicTypeDeclaration *to_type = &elem_type;
+ if(is_vector_or_matrix(*expr_basic))
+ to_type = find_type(elem_type, expr_basic->kind, expr_basic->size);
+ if(to_type)
+ {
+ convert_to(expr, *to_type);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+bool ExpressionResolver::truncate_vector(RefPtr<Expression> &expr, unsigned size)
+{
+ if(BasicTypeDeclaration *expr_basic = dynamic_cast<BasicTypeDeclaration *>(expr->type))
+ if(BasicTypeDeclaration *expr_elem = get_element_type(*expr_basic))
+ {
+ RefPtr<Swizzle> swizzle = new Swizzle;
+ swizzle->left = expr;
+ swizzle->oper = &Operator::get_operator(".", Operator::POSTFIX);
+ swizzle->component_group = string("xyzw", size);
+ swizzle->count = size;
+ for(unsigned i=0; i<size; ++i)
+ swizzle->components[i] = i;
+ if(size==1)
+ swizzle->type = expr_elem;
+ else
+ swizzle->type = find_type(*expr_elem, BasicTypeDeclaration::VECTOR, size);
+ expr = swizzle;
+
+ return true;
+ }
+
+ return false;
+}
+
+void ExpressionResolver::resolve(Expression &expr, TypeDeclaration *type, bool lvalue)
+{
+ r_any_resolved |= (type!=expr.type || lvalue!=expr.lvalue);
+ expr.type = type;
+ expr.lvalue = lvalue;
+}
+
+void ExpressionResolver::visit(Block &block)
+{
+ SetForScope<Block *> set_block(current_block, &block);
+ for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
+ {
+ insert_point = i;
+ (*i)->visit(*this);
+ }
+}
+
+void ExpressionResolver::visit(Literal &literal)
+{
+ if(literal.value.check_type<bool>())
+ resolve(literal, find_type(BasicTypeDeclaration::BOOL, 1), false);
+ else if(literal.value.check_type<int>())
+ resolve(literal, find_type(BasicTypeDeclaration::INT, 32), false);
+ else if(literal.value.check_type<float>())
+ resolve(literal, find_type(BasicTypeDeclaration::FLOAT, 32), false);
+}
+
+void ExpressionResolver::visit(VariableReference &var)
+{
+ if(var.declaration)
+ resolve(var, var.declaration->type_declaration, true);
+}
+
+void ExpressionResolver::visit(InterfaceBlockReference &iface)