/** Finds functions which are candidates for inlining. Currently this means
functions which have no flow control statements, no more than one return
-statement, and are only called once. */
+statement, and are either builtins or only called once. */
class InlineableFunctionLocator: private TraversingVisitor
{
private:
virtual void visit(Iteration &);
};
+class UnreachableCodeRemover: private TraversingVisitor
+{
+private:
+ bool reachable;
+ std::set<Node *> unreachable_nodes;
+
+public:
+ UnreachableCodeRemover();
+
+ virtual bool apply(Stage &);
+
+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; }
+};
+
/** Removes types which are not used anywhere. */
class UnusedTypeRemover: private TraversingVisitor
{
Assignment *r_assignment;
bool assignment_target;
bool r_side_effects;
+ bool in_struct;
+ bool composite_reference;
+ Assignment::Target r_reference;
std::set<Node *> unused_nodes;
public:
void referenced(const Assignment::Target &, Node &);
virtual void visit(VariableReference &);
virtual void visit(InterfaceBlockReference &);
+ void visit_composite(Expression &);
+ virtual void visit(MemberAccess &);
+ virtual void visit(Swizzle &);
virtual void visit(UnaryExpression &);
virtual void visit(BinaryExpression &);
virtual void visit(Assignment &);
+ virtual void visit(TernaryExpression &);
virtual void visit(FunctionCall &);
void record_assignment(const Assignment::Target &, Node &);
virtual void visit(ExpressionStatement &);
- // Ignore structs because their members can't be accessed directly.
- virtual void visit(StructDeclaration &) { }
+ virtual void visit(StructDeclaration &);
virtual void visit(VariableDeclaration &);
virtual void visit(InterfaceBlock &);
void merge_variables(const BlockVariableMap &);