update V8 to TOT snapshot branch
diff --git a/src/data-flow.h b/src/data-flow.h
index 7c16d5d..2331944 100644
--- a/src/data-flow.h
+++ b/src/data-flow.h
@@ -62,6 +62,56 @@
};
+class VarUseMap : public HashMap {
+ public:
+ VarUseMap() : HashMap(VarMatch) {}
+
+ ZoneList<Expression*>* Lookup(Variable* var);
+
+ private:
+ static bool VarMatch(void* key1, void* key2) { return key1 == key2; }
+};
+
+
+class DefinitionInfo : public ZoneObject {
+ public:
+ explicit DefinitionInfo() : last_use_(NULL) {}
+
+ Expression* last_use() { return last_use_; }
+ void set_last_use(Expression* expr) { last_use_ = expr; }
+
+ private:
+ Expression* last_use_;
+ Register location_;
+};
+
+
+class LivenessAnalyzer : public AstVisitor {
+ public:
+ LivenessAnalyzer() {}
+
+ void Analyze(FunctionLiteral* fun);
+
+ private:
+ void VisitStatements(ZoneList<Statement*>* stmts);
+
+ void RecordUse(Variable* var, Expression* expr);
+ void RecordDef(Variable* var, Expression* expr);
+
+
+ // AST node visit functions.
+#define DECLARE_VISIT(type) virtual void Visit##type(type* node);
+ AST_NODE_LIST(DECLARE_VISIT)
+#undef DECLARE_VISIT
+
+ // Map for tracking the live variables.
+ VarUseMap live_vars_;
+
+ DISALLOW_COPY_AND_ASSIGN(LivenessAnalyzer);
+};
+
+
} } // namespace v8::internal
+
#endif // V8_DATAFLOW_H_