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 void visit_and_inline(RefPtr<Expression> &);
88 virtual void visit(Block &);
89 virtual void visit(UnaryExpression &);
90 virtual void visit(BinaryExpression &);
91 virtual void visit(Assignment &a) { visit(static_cast<BinaryExpression &>(a)); }
92 virtual void visit(MemberAccess &);
93 virtual void visit(FunctionCall &);
94 virtual void visit(ExpressionStatement &);
95 virtual void visit(VariableDeclaration &);
96 virtual void visit(FunctionDeclaration &);
97 virtual void visit(Conditional &);
98 virtual void visit(Iteration &);
99 virtual void visit(Return &);
102 /** Inlines variables into expressions. Variables with trivial values (those
103 consisting of a single literal or variable reference) are always inlined.
104 Variables which are only referenced once are also inlined. */
105 class ExpressionInliner: private TraversingVisitor
108 struct ExpressionInfo
110 Expression *expression;
112 RefPtr<Expression> *inline_point;
113 const Operator *inner_oper;
114 const Operator *outer_oper;
122 std::map<VariableDeclaration *, ExpressionInfo> expressions;
123 ExpressionInfo *r_ref_info;
128 Block *iteration_body;
129 const Operator *r_oper;
137 void visit_and_record(RefPtr<Expression> &, const Operator *, bool);
138 void inline_expression(Expression &, RefPtr<Expression> &, const Operator *, const Operator *, bool);
139 virtual void visit(Block &);
140 virtual void visit(VariableReference &);
141 virtual void visit(MemberAccess &);
142 virtual void visit(UnaryExpression &);
143 virtual void visit(BinaryExpression &);
144 virtual void visit(Assignment &);
145 virtual void visit(FunctionCall &);
146 virtual void visit(VariableDeclaration &);
147 virtual void visit(Conditional &);
148 virtual void visit(Iteration &);
149 virtual void visit(Return &);
152 /** Removes conditional statements and loops where the condition can be
153 determined as constant at compile time. */
154 class ConstantConditionEliminator: private TraversingVisitor
157 NodeList<Statement>::iterator insert_point;
158 std::set<Node *> nodes_to_remove;
164 virtual void visit(Block &);
165 virtual void visit(Conditional &);
166 virtual void visit(Iteration &);
169 /** Removes types which are not used anywhere. */
170 class UnusedTypeRemover: private TraversingVisitor
173 std::set<Node *> unused_nodes;
179 virtual void visit(Literal &);
180 virtual void visit(UnaryExpression &);
181 virtual void visit(BinaryExpression &);
182 virtual void visit(FunctionCall &);
183 virtual void visit(BasicTypeDeclaration &);
184 virtual void visit(ImageTypeDeclaration &);
185 virtual void visit(StructDeclaration &);
186 virtual void visit(VariableDeclaration &);
187 virtual void visit(InterfaceBlock &);
188 virtual void visit(FunctionDeclaration &);
191 /** Removes variable declarations with no references to them. Assignment
192 statements where the result is not used are also removed. */
193 class UnusedVariableRemover: private TraversingVisitor
199 std::vector<Node *> assignments;
200 bool conditionally_assigned;
206 typedef std::map<VariableDeclaration *, VariableInfo> BlockVariableMap;
208 std::set<Node *> unused_nodes;
209 std::map<VariableDeclaration *, Node *> aggregates;
211 std::vector<BlockVariableMap> variables;
212 Assignment *r_assignment;
213 bool assignment_target;
214 bool r_assign_to_subfield;
218 UnusedVariableRemover();
223 virtual void visit(VariableReference &);
224 virtual void visit(InterfaceBlockReference &);
225 virtual void visit(MemberAccess &);
226 virtual void visit(UnaryExpression &);
227 virtual void visit(BinaryExpression &);
228 virtual void visit(Assignment &);
229 void record_assignment(VariableDeclaration &, Node &, bool);
230 void clear_assignments(VariableInfo &, bool);
231 virtual void visit(FunctionCall &);
232 virtual void visit(ExpressionStatement &);
233 virtual void visit(StructDeclaration &);
234 virtual void visit(VariableDeclaration &);
235 virtual void visit(InterfaceBlock &);
236 virtual void visit(FunctionDeclaration &);
237 void merge_down_variables();
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 &);