+ enum DeclarationKind
+ {
+ NO_DECLARATION,
+ LAYOUT,
+ STRUCT,
+ VARIABLE,
+ FUNCTION
+ };
+
+ DeclarationKind kind;
+
+ DeclarationReorderer();
+
+ using Visitor::visit;
+ virtual void visit(ProgramSyntax::Block &);
+ virtual void visit(ProgramSyntax::InterfaceLayout &) { kind = LAYOUT; }
+ virtual void visit(ProgramSyntax::StructDeclaration &) { kind = STRUCT; }
+ virtual void visit(ProgramSyntax::VariableDeclaration &) { kind = VARIABLE; }
+ virtual void visit(ProgramSyntax::InterfaceBlock &) { kind = VARIABLE; }
+ virtual void visit(ProgramSyntax::FunctionDeclaration &) { kind = FUNCTION; }
+ };
+
+ struct InlineableFunctionLocator: Visitor
+ {
+ typedef std::set<ProgramSyntax::FunctionDeclaration *> ResultType;
+
+ std::map<ProgramSyntax::FunctionDeclaration *, unsigned> refcounts;
+ std::set<ProgramSyntax::FunctionDeclaration *> inlineable;
+ ProgramSyntax::FunctionDeclaration *in_function;
+
+ InlineableFunctionLocator();
+
+ const ResultType &get_result() const { return inlineable; }
+ using Visitor::visit;
+ virtual void visit(ProgramSyntax::FunctionCall &);
+ virtual void visit(ProgramSyntax::FunctionDeclaration &);
+ };
+
+ struct FunctionInliner: Visitor
+ {
+ std::set<ProgramSyntax::FunctionDeclaration *> inlineable;
+ unsigned extract_result;
+ RefPtr<ProgramSyntax::Expression> inline_result;
+
+ FunctionInliner();
+ FunctionInliner(const std::set<ProgramSyntax::FunctionDeclaration *> &);
+
+ void visit_and_inline(RefPtr<ProgramSyntax::Expression> &);
+ using Visitor::visit;
+ virtual void visit(ProgramSyntax::Block &);
+ virtual void visit(ProgramSyntax::UnaryExpression &);
+ virtual void visit(ProgramSyntax::BinaryExpression &);
+ virtual void visit(ProgramSyntax::FunctionCall &);
+ virtual void visit(ProgramSyntax::Return &);
+ };
+
+ struct ExpressionEvaluator: ProgramSyntax::NodeVisitor
+ {
+ typedef std::map<ProgramSyntax::VariableDeclaration *, ProgramSyntax::Expression *> ValueMap;
+
+ const ValueMap *variable_values;
+ float result;
+ bool result_valid;
+
+ ExpressionEvaluator();
+ ExpressionEvaluator(const ValueMap &);
+
+ using ProgramSyntax::NodeVisitor::visit;
+ virtual void visit(ProgramSyntax::Literal &);
+ virtual void visit(ProgramSyntax::ParenthesizedExpression &);
+ virtual void visit(ProgramSyntax::VariableReference &);
+ virtual void visit(ProgramSyntax::UnaryExpression &);
+ virtual void visit(ProgramSyntax::BinaryExpression &);
+ };
+
+ struct ConstantConditionEliminator: BlockModifier
+ {
+ unsigned scope_level;
+ ExpressionEvaluator::ValueMap variable_values;
+
+ ConstantConditionEliminator();
+
+ using Visitor::visit;
+ virtual void visit(ProgramSyntax::Block &);
+ virtual void visit(ProgramSyntax::Assignment &);
+ virtual void visit(ProgramSyntax::VariableDeclaration &);
+ virtual void visit(ProgramSyntax::Conditional &);
+ virtual void visit(ProgramSyntax::Iteration &);
+ };
+
+ struct UnusedVariableLocator: Visitor
+ {
+ struct VariableInfo
+ {
+ bool local;
+ std::vector<ProgramSyntax::Node *> assignments;
+ bool conditionally_assigned;
+ bool referenced;
+
+ VariableInfo();
+ };
+
+ typedef std::set<ProgramSyntax::Node *> ResultType;
+ typedef std::map<ProgramSyntax::VariableDeclaration *, VariableInfo> BlockVariableMap;
+