X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fglsl%2Foptimize.h;h=eae90399542d3130ba38e08c24d87f6f13a7ff50;hb=518f751d385b733adbf43fe4056403740709edec;hp=2e28d48a0dcbfe711057572cc7f5e1574dbe8789;hpb=1fa69bb8eec3070f5da296d6dd0bd67aea62d3bf;p=libs%2Fgl.git

diff --git a/source/glsl/optimize.h b/source/glsl/optimize.h
index 2e28d48a..eae90399 100644
--- a/source/glsl/optimize.h
+++ b/source/glsl/optimize.h
@@ -10,7 +10,9 @@ namespace Msp {
 namespace GL {
 namespace SL {
 
-class InlineableFunctionLocator: public TraversingVisitor
+/** Finds functions which are candidates for inlining.  Currently this means
+functions which have no parameters and are only called once. */
+class InlineableFunctionLocator: private TraversingVisitor
 {
 private:
 	std::map<FunctionDeclaration *, unsigned> refcounts;
@@ -20,52 +22,76 @@ private:
 public:
 	InlineableFunctionLocator();
 
-	const std::set<FunctionDeclaration *> &apply(Stage &s) { visit(s.content); return inlineable; }
+	const std::set<FunctionDeclaration *> &apply(Stage &s) { s.content.visit(*this); return inlineable; }
 
-	using TraversingVisitor::visit;
+private:
 	virtual void visit(FunctionCall &);
 	virtual void visit(FunctionDeclaration &);
 };
 
-class FunctionInliner: public TraversingVisitor
+/** Collects declarations referenced by a function. */
+class InlineDependencyCollector: private TraversingVisitor
+{
+private:
+	std::set<Node *> dependencies;
+
+public:
+	const std::set<Node *> &apply(FunctionDeclaration &f) { f.visit(*this); return dependencies; }
+
+private:
+	virtual void visit(VariableReference &);
+	virtual void visit(InterfaceBlockReference &);
+	virtual void visit(FunctionCall &);
+	virtual void visit(VariableDeclaration &);
+};
+
+/** Inlines functions.  Internally uses InlineableFunctionLocator to find
+candidate functions.  Only functions which consist of a single return statement
+are inlined. */
+class FunctionInliner: private TraversingVisitor
 {
 private:
+	Stage *stage;
 	std::set<FunctionDeclaration *> inlineable;
+	FunctionDeclaration *current_function;
 	unsigned extract_result;
 	RefPtr<Expression> inline_result;
+	bool any_inlined;
 
 public:
 	FunctionInliner();
-	FunctionInliner(const std::set<FunctionDeclaration *> &);
 
-	void apply(Stage &s) { visit(s.content); }
+	bool apply(Stage &);
 
 private:
 	void visit_and_inline(RefPtr<Expression> &);
-public:
-	using TraversingVisitor::visit;
+
 	virtual void visit(Block &);
 	virtual void visit(UnaryExpression &);
 	virtual void visit(BinaryExpression &);
 	virtual void visit(MemberAccess &);
 	virtual void visit(FunctionCall &);
 	virtual void visit(VariableDeclaration &);
+	virtual void visit(FunctionDeclaration &);
 	virtual void visit(Return &);
 };
 
-class ConstantConditionEliminator: public BlockModifier
+/** Removes conditional statements and loops where the condition can be
+determined as constant at compile time. */
+class ConstantConditionEliminator: private TraversingVisitor
 {
 private:
-	unsigned scope_level;
 	bool record_only;
 	ExpressionEvaluator::ValueMap variable_values;
+	NodeList<Statement>::iterator insert_point;
+	std::set<Node *> nodes_to_remove;
 
 public:
 	ConstantConditionEliminator();
 
-	void apply(Stage &s) { visit(s.content); }
+	void apply(Stage &);
 
-	using BlockModifier::visit;
+private:
 	virtual void visit(Block &);
 	virtual void visit(UnaryExpression &);
 	virtual void visit(Assignment &);
@@ -74,7 +100,9 @@ public:
 	virtual void visit(Iteration &);
 };
 
-class UnusedVariableLocator: public TraversingVisitor
+/** Removes variable declarations with no references to them.  Assignment
+statements where the result is not used are also removed. */
+class UnusedVariableRemover: private TraversingVisitor
 {
 private:
 	struct VariableInfo
@@ -96,44 +124,41 @@ private:
 	Assignment *assignment;
 	bool assignment_target;
 	bool assign_to_subscript;
-	bool global_scope;
 
 public:
-	UnusedVariableLocator();
+	UnusedVariableRemover();
 
-	const std::set<Node *> &apply(Stage &);
+	bool apply(Stage &);
 
-	using TraversingVisitor::visit;
+private:
 	virtual void visit(VariableReference &);
+	virtual void visit(InterfaceBlockReference &);
 	virtual void visit(MemberAccess &);
 	virtual void visit(BinaryExpression &);
 	virtual void visit(Assignment &);
-private:
 	void record_assignment(VariableDeclaration &, Node &, bool);
 	void clear_assignments(VariableInfo &, bool);
-public:
 	virtual void visit(ExpressionStatement &);
 	virtual void visit(StructDeclaration &);
 	virtual void visit(VariableDeclaration &);
 	virtual void visit(InterfaceBlock &);
 	virtual void visit(FunctionDeclaration &);
-private:
 	void merge_down_variables();
-public:
 	virtual void visit(Conditional &);
 	virtual void visit(Iteration &);
 };
 
-class UnusedFunctionLocator: public TraversingVisitor
+/** Removes function declarations with no references to them. */
+class UnusedFunctionRemover: private TraversingVisitor
 {
 private:
 	std::set<Node *> unused_nodes;
 	std::set<FunctionDeclaration *> used_definitions;
 
 public:
-	const std::set<Node *> &apply(Stage &s) { visit(s.content); return unused_nodes; }
+	bool apply(Stage &s);
 
-	using TraversingVisitor::visit;
+private:
 	virtual void visit(FunctionCall &);
 	virtual void visit(FunctionDeclaration &);
 };