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/*
* Copyright (c) 2009, 2010, 2011, 2012 Nicira, 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 COVERAGE_H
#define COVERAGE_H 1
/* This file implements a simple form of coverage instrumentation. Points in
* source code that are of interest must be explicitly annotated with
* COVERAGE_INC. The coverage counters may be logged at any time with
* coverage_log().
*
* This form of coverage instrumentation is intended to be so lightweight that
* it can be enabled in production builds. It is obviously not a substitute
* for traditional coverage instrumentation with e.g. "gcov", but it is still
* a useful debugging tool. */
#include "vlog.h"
/* A coverage counter. */
struct coverage_counter {
const char *name; /* Textual name. */
unsigned int count; /* Count within the current epoch. */
unsigned long long int total; /* Total count over all epochs. */
};
/* Defines COUNTER. There must be exactly one such definition at file scope
* within a program. */
#if USE_LINKER_SECTIONS
#define COVERAGE_DEFINE(COUNTER) \
COVERAGE_DEFINE__(COUNTER); \
extern struct coverage_counter *counter_ptr_##COUNTER; \
struct coverage_counter *counter_ptr_##COUNTER \
__attribute__((section("coverage"))) = &counter_##COUNTER
#else
#define COVERAGE_DEFINE(MODULE) \
extern struct coverage_counter counter_##MODULE
#endif
/* Adds 1 to COUNTER. */
#define COVERAGE_INC(COUNTER) counter_##COUNTER.count++;
/* Adds AMOUNT to COUNTER. */
#define COVERAGE_ADD(COUNTER, AMOUNT) counter_##COUNTER.count += (AMOUNT);
void coverage_init(void);
void coverage_log(void);
void coverage_clear(void);
/* Implementation detail. */
#define COVERAGE_DEFINE__(COUNTER) \
extern struct coverage_counter counter_##COUNTER; \
struct coverage_counter counter_##COUNTER = { #COUNTER, 0, 0 }
#endif /* coverage.h */
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