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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef GAPIR_FUNCTION_TABLE_H
#define GAPIR_FUNCTION_TABLE_H
#include <stdint.h>
#include <functional>
#include <unordered_map>
namespace gapir {
class Stack;
// FunctionTable provides a mapping of function id to a VM function.
class FunctionTable {
public:
// General signature for functions callable by the interpreter with a function call
// instruction. The first argument is a pointer to the stack of the Virtual Machine and the
// second argument is true if the caller expect the return value of the function to be pushed
// to the stack. The function should return true if the function call was successful, false
// otherwise.
typedef std::function<bool(Stack*, bool)> Function;
// The function identifier. These are part of the protocol between the server and the replay
// system, and so must remain consistent.
typedef uint16_t Id;
// Inserts a function into the table.
inline void insert(Id id, Function func);
// Returns a function from the table, or nullptr if there is no function with the specified
// identifier.
inline Function* lookup(Id id);
private:
// Map of the supported function ids to the actual function implementations
std::unordered_map<Id, Function> mFunctions;
};
inline FunctionTable::Function* FunctionTable::lookup(Id id) {
auto func = mFunctions.find(id);
if (func == mFunctions.end()) {
return nullptr;
}
return &func->second;
}
inline void FunctionTable::insert(Id id, Function func) {
mFunctions[id] = func;
}
} // namespace gapir
#endif // GAPIR_FUNCTION_TABLE_H