1 #ifndef MSP_GL_SL_OPTIMIZE_H_
2 #define MSP_GL_SL_OPTIMIZE_H_
13 /** Finds functions which are candidates for inlining. Currently this means
14 functions which have no parameters, contain no more than one return statement,
15 and are only called once. */
16 class InlineableFunctionLocator: private TraversingVisitor
19 std::map<FunctionDeclaration *, unsigned> refcounts;
20 std::set<FunctionDeclaration *> inlineable;
21 FunctionDeclaration *current_function;
22 unsigned return_count;
25 InlineableFunctionLocator();
27 const std::set<FunctionDeclaration *> &apply(Stage &s) { s.content.visit(*this); return inlineable; }
30 virtual void visit(FunctionCall &);
31 virtual void visit(FunctionDeclaration &);
32 virtual void visit(Conditional &);
33 virtual void visit(Iteration &);
34 virtual void visit(Return &);
37 /** Injects statements from one function into another. Local variables are
38 renamed to avoid conflicts. After inlining, uses NodeReorderer to cause
39 dependencies of the inlined statements to appear before the target function. */
40 class InlineContentInjector: private TraversingVisitor
43 FunctionDeclaration *source_func;
45 std::map<std::string, VariableDeclaration *> variable_map;
48 RefPtr<Statement> r_inlined_statement;
49 std::set<Node *> dependencies;
50 std::string r_result_name;
53 InlineContentInjector();
55 const std::string &apply(Stage &, FunctionDeclaration &, Block &, const NodeList<Statement>::iterator &, FunctionDeclaration &);
58 std::string create_unused_name(const std::string &, bool);
60 virtual void visit(VariableReference &);
61 virtual void visit(InterfaceBlockReference &);
62 virtual void visit(FunctionCall &);
63 virtual void visit(VariableDeclaration &);
64 virtual void visit(Return &);
67 /** Inlines functions. Internally uses InlineableFunctionLocator to find
68 candidate functions. Only functions which consist of a single return statement
70 class FunctionInliner: private TraversingVisitor
74 std::set<FunctionDeclaration *> inlineable;
75 FunctionDeclaration *current_function;
76 NodeList<Statement>::iterator insert_point;
77 RefPtr<Expression> r_inline_result;
86 virtual void visit(RefPtr<Expression> &);
87 virtual void visit(Block &);
88 virtual void visit(FunctionCall &);
89 virtual void visit(FunctionDeclaration &);
90 virtual void visit(Iteration &);
93 /** Inlines variables into expressions. Variables with trivial values (those
94 consisting of a single literal or variable reference) are always inlined.
95 Variables which are only referenced once are also inlined. */
96 class ExpressionInliner: private TraversingVisitor
101 Expression *expression;
103 RefPtr<Expression> *inline_point;
110 std::map<Assignment::Target, ExpressionInfo> expressions;
111 ExpressionInfo *r_ref_info;
116 Block *iteration_body;
117 const Operator *r_oper;
125 void visit_and_record(RefPtr<Expression> &);
126 void inline_expression(Expression &, RefPtr<Expression> &);
127 virtual void visit(Block &);
128 virtual void visit(RefPtr<Expression> &);
129 virtual void visit(VariableReference &);
130 virtual void visit(MemberAccess &);
131 virtual void visit(Swizzle &);
132 virtual void visit(UnaryExpression &);
133 virtual void visit(BinaryExpression &);
134 virtual void visit(Assignment &);
135 virtual void visit(TernaryExpression &);
136 virtual void visit(FunctionCall &);
137 virtual void visit(VariableDeclaration &);
138 virtual void visit(Iteration &);
141 /** Removes conditional statements and loops where the condition can be
142 determined as constant at compile time. */
143 class ConstantConditionEliminator: private TraversingVisitor
146 NodeList<Statement>::iterator insert_point;
147 std::set<Node *> nodes_to_remove;
153 virtual void visit(Block &);
154 virtual void visit(Conditional &);
155 virtual void visit(Iteration &);
158 /** Removes types which are not used anywhere. */
159 class UnusedTypeRemover: private TraversingVisitor
162 std::set<Node *> unused_nodes;
168 virtual void visit(Literal &);
169 virtual void visit(UnaryExpression &);
170 virtual void visit(BinaryExpression &);
171 virtual void visit(TernaryExpression &);
172 virtual void visit(FunctionCall &);
173 virtual void visit(BasicTypeDeclaration &);
174 virtual void visit(ImageTypeDeclaration &);
175 virtual void visit(StructDeclaration &);
176 virtual void visit(VariableDeclaration &);
177 virtual void visit(InterfaceBlock &);
178 virtual void visit(FunctionDeclaration &);
181 /** Removes variable declarations with no references to them. Assignment
182 statements where the result is not used are also removed. */
183 class UnusedVariableRemover: private TraversingVisitor
186 struct AssignmentInfo
189 Assignment::Target target;
190 std::vector<Node *> used_by;
192 AssignmentInfo(): node(0) { }
197 InterfaceBlock *interface_block;
198 std::vector<AssignmentInfo *> assignments;
203 VariableInfo(): interface_block(0), initialized(false), output(false), referenced(false) { }
206 typedef std::map<Statement *, VariableInfo> BlockVariableMap;
209 BlockVariableMap variables;
210 std::list<AssignmentInfo> assignments;
211 InterfaceBlock *interface_block;
212 Assignment *r_assignment;
213 bool assignment_target;
215 std::set<Node *> unused_nodes;
218 UnusedVariableRemover();
223 void referenced(const Assignment::Target &, Node &);
224 virtual void visit(VariableReference &);
225 virtual void visit(InterfaceBlockReference &);
226 virtual void visit(UnaryExpression &);
227 virtual void visit(BinaryExpression &);
228 virtual void visit(Assignment &);
229 virtual void visit(FunctionCall &);
230 void record_assignment(const Assignment::Target &, Node &);
231 virtual void visit(ExpressionStatement &);
232 // Ignore structs because their members can't be accessed directly.
233 virtual void visit(StructDeclaration &) { }
234 virtual void visit(VariableDeclaration &);
235 virtual void visit(InterfaceBlock &);
236 void merge_variables(const BlockVariableMap &);
237 virtual void visit(FunctionDeclaration &);
238 virtual void visit(Conditional &);
239 virtual void visit(Iteration &);
242 /** Removes function declarations with no references to them. */
243 class UnusedFunctionRemover: private TraversingVisitor
246 std::set<Node *> unused_nodes;
247 std::set<FunctionDeclaration *> used_definitions;
250 bool apply(Stage &s);
253 virtual void visit(FunctionCall &);
254 virtual void visit(FunctionDeclaration &);