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      1 /*
      2  * Copyright 2017, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef VISITOR_H
     18 #define VISITOR_H
     19 
     20 #include <functional>
     21 
     22 namespace android {
     23 namespace spirit {
     24 
     25 class Entity;
     26 class Module;
     27 class EntryPointDefinition;
     28 class DebugInfoSection;
     29 class AnnotationSection;
     30 class GlobalSection;
     31 class FunctionDeclaration;
     32 class Block;
     33 class FunctionDefinition;
     34 class Instruction;
     35 #define HANDLE_INSTRUCTION(OPCODE, INST_CLASS) class INST_CLASS;
     36 #include "instruction_dispatches_generated.h"
     37 #undef HANDLE_INSTRUCTION
     38 
     39 class IVisitor {
     40 public:
     41   virtual ~IVisitor() {}
     42 
     43   virtual void visit(Entity *) = 0;
     44   virtual void visit(Module *) = 0;
     45   virtual void visit(EntryPointDefinition *) = 0;
     46   virtual void visit(DebugInfoSection *) = 0;
     47   virtual void visit(AnnotationSection *) = 0;
     48   virtual void visit(GlobalSection *) = 0;
     49   virtual void visit(FunctionDeclaration *) = 0;
     50   virtual void visit(Block *) = 0;
     51   virtual void visit(FunctionDefinition *) = 0;
     52   virtual void visit(Instruction *) = 0;
     53 #define HANDLE_INSTRUCTION(OPCODE, INST_CLASS)                                 \
     54   virtual void visit(INST_CLASS *) = 0;
     55 #include "instruction_dispatches_generated.h"
     56 #undef HANDLE_INSTRUCTION
     57 };
     58 
     59 class DoNothingVisitor : public IVisitor {
     60 public:
     61   virtual ~DoNothingVisitor() {}
     62 
     63   virtual void visit(Entity *e);
     64   virtual void visit(Module *m);
     65   virtual void visit(EntryPointDefinition *);
     66   virtual void visit(DebugInfoSection *dinfo);
     67   virtual void visit(AnnotationSection *a);
     68   virtual void visit(GlobalSection *g);
     69   virtual void visit(FunctionDeclaration *fdecl);
     70   virtual void visit(Block *b);
     71   virtual void visit(FunctionDefinition *fdef);
     72   // This visit(Instruction *) necessary?
     73   virtual void visit(Instruction *inst);
     74 #define HANDLE_INSTRUCTION(OPCODE, INST_CLASS) virtual void visit(INST_CLASS *);
     75 #include "instruction_dispatches_generated.h"
     76 #undef HANDLE_INSTRUCTION
     77 };
     78 
     79 template <typename T> class InstructionVisitor : public DoNothingVisitor {
     80 public:
     81   InstructionVisitor(T action) : mAction(action) {}
     82 
     83   virtual ~InstructionVisitor() {}
     84 
     85 #define HANDLE_INSTRUCTION(OPCODE, INST_CLASS)                                 \
     86   void visit(INST_CLASS *inst) override { mAction((Instruction *)inst); }
     87 #include "instruction_dispatches_generated.h"
     88 #undef HANDLE_INSTRUCTION
     89 
     90 private:
     91   T mAction;
     92 };
     93 
     94 template <typename T> static IVisitor *CreateInstructionVisitor(T action) {
     95   return new InstructionVisitor<decltype(action)>(action);
     96 }
     97 
     98 } // namespace spirit
     99 } // namespace android
    100 
    101 #endif // VISITOR_H
    102