compile_context.h

/*
Copyright 2013-present Barefoot Networks, Inc.
 
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 LIB_COMPILE_CONTEXT_H_
#define LIB_COMPILE_CONTEXT_H_
 
#include <typeinfo>
#include <vector>
 
#include "lib/cstring.h"
#include "lib/error_reporter.h"
 
namespace P4 {
 
class ICompileContext {
 protected:
    virtual ~ICompileContext() = 0;
};
 
struct CompileContextStack final {
    CompileContextStack() = delete;
 
    template <typename CompileContextType>
    static CompileContextType &top() {
        auto &stack = getStack();
        if (stack.empty()) reportNoContext();
        auto *current = dynamic_cast<CompileContextType *>(stack.back());
        if (!current) reportContextMismatch(typeid(CompileContextType).name());
        return *current;
    }
 
    static bool isEmpty() { return getStack().empty(); }
 
 private:
    friend struct AutoCompileContext;
 
    using StackType = std::vector<ICompileContext *>;
 
    static void reportNoContext();
    static void reportContextMismatch(const char *desiredContextType);
 
    static void push(ICompileContext *context);
    static void pop();
    static StackType &getStack();
};
 
struct AutoCompileContext {
    explicit AutoCompileContext(ICompileContext *context);
    ~AutoCompileContext();
};
 
class BaseCompileContext : public ICompileContext {
 protected:
    BaseCompileContext() = default;
    BaseCompileContext(const BaseCompileContext &other) = default;
    BaseCompileContext &operator=(const BaseCompileContext &other) = default;
 
 public:
    static BaseCompileContext &get();
 
    virtual ErrorReporter &errorReporter();
 
    virtual DiagnosticAction getDefaultInfoDiagnosticAction();
 
    virtual DiagnosticAction getDefaultWarningDiagnosticAction();
 
    virtual DiagnosticAction getDefaultErrorDiagnosticAction();
 
 private:
    ErrorReporter errorReporterInstance;
};
 
}  // namespace P4
 
#endif /* LIB_COMPILE_CONTEXT_H_ */