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> inlined_statement;
49 std::set<Node *> dependencies;
50 std::string 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> 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(MemberAccess &);
92 virtual void visit(FunctionCall &);
93 virtual void visit(ExpressionStatement &);
94 virtual void visit(VariableDeclaration &);
95 virtual void visit(FunctionDeclaration &);
96 virtual void visit(Return &);
99 /** Removes conditional statements and loops where the condition can be
100 determined as constant at compile time. */
101 class ConstantConditionEliminator: private TraversingVisitor
105 ExpressionEvaluator::ValueMap variable_values;
106 NodeList<Statement>::iterator insert_point;
107 std::set<Node *> nodes_to_remove;
110 ConstantConditionEliminator();
115 virtual void visit(Block &);
116 virtual void visit(UnaryExpression &);
117 virtual void visit(Assignment &);
118 virtual void visit(VariableDeclaration &);
119 virtual void visit(Conditional &);
120 virtual void visit(Iteration &);
123 /** Removes variable declarations with no references to them. Assignment
124 statements where the result is not used are also removed. */
125 class UnusedVariableRemover: private TraversingVisitor
131 std::vector<Node *> assignments;
132 bool conditionally_assigned;
138 typedef std::map<VariableDeclaration *, VariableInfo> BlockVariableMap;
140 std::set<Node *> unused_nodes;
141 std::map<VariableDeclaration *, Node *> aggregates;
143 std::vector<BlockVariableMap> variables;
144 Assignment *assignment;
145 bool assignment_target;
146 bool assign_to_subscript;
150 UnusedVariableRemover();
155 virtual void visit(VariableReference &);
156 virtual void visit(InterfaceBlockReference &);
157 virtual void visit(MemberAccess &);
158 virtual void visit(UnaryExpression &);
159 virtual void visit(BinaryExpression &);
160 virtual void visit(Assignment &);
161 void record_assignment(VariableDeclaration &, Node &, bool);
162 void clear_assignments(VariableInfo &, bool);
163 virtual void visit(FunctionCall &);
164 virtual void visit(ExpressionStatement &);
165 virtual void visit(StructDeclaration &);
166 virtual void visit(VariableDeclaration &);
167 virtual void visit(InterfaceBlock &);
168 virtual void visit(FunctionDeclaration &);
169 void merge_down_variables();
170 virtual void visit(Conditional &);
171 virtual void visit(Iteration &);
174 /** Removes function declarations with no references to them. */
175 class UnusedFunctionRemover: private TraversingVisitor
178 std::set<Node *> unused_nodes;
179 std::set<FunctionDeclaration *> used_definitions;
182 bool apply(Stage &s);
185 virtual void visit(FunctionCall &);
186 virtual void visit(FunctionDeclaration &);