+ virtual void visit(StructDeclaration &);
+ virtual void visit(VariableDeclaration &);
+ virtual void visit(FunctionDeclaration &);
+ virtual void visit(Conditional &);
+ virtual void visit(Iteration &);
+ virtual void visit(Return &);
+};
+
+/** Verifies flow control constructs. Functions returning non-void must have
+return statements. Warnings are given about dead code. */
+class FlowControlValidator: private Validator
+{
+private:
+ bool reachable = true;
+
+public:
+ void apply(Stage &s) { stage = &s; s.content.visit(*this); }
+
+private:
+ virtual void visit(Block &);
+ virtual void visit(FunctionDeclaration &);
+ virtual void visit(Conditional &);
+ virtual void visit(Iteration &);
+ virtual void visit(Return &) { reachable = false; }
+ virtual void visit(Jump &) { reachable = false; }
+};
+
+/** Verifies that stage input and output interfaces are valid. Linked
+variables must have matching types and locations and there must not be any
+overlap in locations. */
+class StageInterfaceValidator: private Validator
+{
+private:
+ std::map<std::string, std::map<unsigned, VariableDeclaration *> > used_locations;
+
+public:
+ void apply(Stage &s) { stage = &s; s.content.visit(*this); }
+
+private:
+ virtual void visit(VariableDeclaration &);
+ virtual void visit(FunctionDeclaration &) { }
+};
+
+/** Verifies that uniform interfaces are valid across the entire module.
+Variables declared with the same binding must have the same name and type. */
+class GlobalInterfaceValidator: private Validator
+{
+private:
+ struct Uniform
+ {
+ Node *node = 0;
+ TypeDeclaration *type = 0;
+ std::string name;
+ int location = -1;
+ unsigned loc_count = 1;
+ int desc_set = 0;
+ int bind_point = -1;
+ };
+
+ std::list<Uniform> uniforms;
+ std::map<std::string, const Uniform *> used_names;
+ std::map<unsigned, const Uniform *> used_locations;
+ std::map<unsigned, std::map<unsigned, const Uniform *> > used_bindings;
+
+public:
+ void apply(Module &);
+
+private:
+ void check_uniform(const Uniform &);
+