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third_party_littlefs/lfs_util.h
Christopher Haster f42e007709 Created initial implementation of revamped test.py 
This is the start of reworking littlefs's testing framework based on
lessons learned from the initial testing framework.

1. The testing framework needs to be _flexible_. It was hacky, which by
   itself isn't a downside, but it wasn't _flexible_. This limited what
   could be done with the tests and there ended up being many
   workarounds just to reproduce bugs.

   The idea behind this revamped framework is to separate the
   description of tests (tests/test_dirs.toml) and the running of tests
   (scripts/test.py).

   Now, with the logic moved entirely to python, it's possible to run
   the test under varying environments. In addition to the "just don't
   assert" run, I'm also looking to run the tests in valgrind for memory
   checking, and an environment with simulated power-loss.

   The test description can also contain abstract attributes that help
   control how tests can be ran, such as "leaky" to identify tests where
   memory leaks are expected. This keeps test limitations at a minimum
   without limiting how the tests can be ran.

2. Multi-stage-process tests didn't really add value and limited what
   the testing environment.

   Unmounting + mounting can be done in a single process to test the
   same logic. It would be really difficult to make this fail only
   when memory is zeroed, though that can still be caught by
   power-resilient tests.

   Requiring every test to be a single process adds several options
   for test execution, such as using a RAM-backed block device for
   speed, or even running the tests on a device.

3. Added fancy assert interception. This wasn't really a requirement,
   but something I've been wanting to experiment with for a while.

   During testing, scripts/explode_asserts.py is added to the build
   process. This is a custom C-preprocessor that parses out assert
   statements and replaces them with _very_ verbose asserts that
   wouldn't normally be possible with just C macros.

   It even goes as far as to report the arguments to strcmp, since the
   lack of visibility here was very annoying.

   tests_/test_dirs.toml:186:assert: assert failed with "..", expected eq "..."
       assert(strcmp(info.name, "...") == 0);

   One downside is that simply parsing C in python is slower than the
   entire rest of the compilation, but fortunately this can be
   alleviated by parallelizing the test builds through make.

Other neat bits:
- All generated files are a suffix of the test description, this helps
  cleanup and means it's (theoretically) possible to parallelize the
  tests.
- The generated test.c is shoved base64 into an ad-hoc Makefile, this
  means it doesn't force a rebuild of tests all the time.
- Test parameterizing is now easier.
- Hopefully this framework can be repurposed also for benchmarks in the
  future.
2019-12-28 23:43:02 -06:00

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/*
* lfs utility functions
*
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef LFS_UTIL_H
#define LFS_UTIL_H
// Users can override lfs_util.h with their own configuration by defining
// LFS_CONFIG as a header file to include (-DLFS_CONFIG=lfs_config.h).
//
// If LFS_CONFIG is used, none of the default utils will be emitted and must be
// provided by the config file. To start, I would suggest copying lfs_util.h
// and modifying as needed.
#ifdef LFS_CONFIG
#define LFS_STRINGIZE(x) LFS_STRINGIZE2(x)
#define LFS_STRINGIZE2(x) #x
#include LFS_STRINGIZE(LFS_CONFIG)
#else
// System includes
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <inttypes.h>
#ifndef LFS_NO_MALLOC
#include <stdlib.h>
#endif
#ifndef LFS_NO_ASSERT
#include <assert.h>
#endif
#if !defined(LFS_NO_DEBUG) || \
!defined(LFS_NO_WARN) || \
!defined(LFS_NO_ERROR) || \
defined(LFS_YES_TRACE)
#include <stdio.h>
#endif
#ifdef __cplusplus
extern "C"
{
#endif
// Macros, may be replaced by system specific wrappers. Arguments to these
// macros must not have side-effects as the macros can be removed for a smaller
// code footprint
// Logging functions
#ifdef LFS_YES_TRACE
#define LFS_TRACE(fmt, ...) \
printf("%s:%d:trace: " fmt "\n", __FILE__, __LINE__, __VA_ARGS__)
#else
#define LFS_TRACE(fmt, ...)
#endif
#ifndef LFS_NO_DEBUG
#define LFS_DEBUG(fmt, ...) \
printf("%s:%d:debug: " fmt "\n", __FILE__, __LINE__, __VA_ARGS__)
#else
#define LFS_DEBUG(fmt, ...)
#endif
#ifndef LFS_NO_WARN
#define LFS_WARN(fmt, ...) \
printf("%s:%d:warn: " fmt "\n", __FILE__, __LINE__, __VA_ARGS__)
#else
#define LFS_WARN(fmt, ...)
#endif
#ifndef LFS_NO_ERROR
#define LFS_ERROR(fmt, ...) \
printf("%s:%d:error: " fmt "\n", __FILE__, __LINE__, __VA_ARGS__)
#else
#define LFS_ERROR(fmt, ...)
#endif
// Runtime assertions
#ifndef LFS_NO_ASSERT
#define LFS_ASSERT(test) assert(test)
#else
#define LFS_ASSERT(test)
#endif
// Builtin functions, these may be replaced by more efficient
// toolchain-specific implementations. LFS_NO_INTRINSICS falls back to a more
// expensive basic C implementation for debugging purposes
// Min/max functions for unsigned 32-bit numbers
static inline uint32_t lfs_max(uint32_t a, uint32_t b) {
return (a > b) ? a : b;
}
static inline uint32_t lfs_min(uint32_t a, uint32_t b) {
return (a < b) ? a : b;
}
// Align to nearest multiple of a size
static inline uint32_t lfs_aligndown(uint32_t a, uint32_t alignment) {
return a - (a % alignment);
}
static inline uint32_t lfs_alignup(uint32_t a, uint32_t alignment) {
return lfs_aligndown(a + alignment-1, alignment);
}
// Find the next smallest power of 2 less than or equal to a
static inline uint32_t lfs_npw2(uint32_t a) {
#if !defined(LFS_NO_INTRINSICS) && (defined(__GNUC__) || defined(__CC_ARM))
return 32 - __builtin_clz(a-1);
#else
uint32_t r = 0;
uint32_t s;
a -= 1;
s = (a > 0xffff) << 4; a >>= s; r |= s;
s = (a > 0xff ) << 3; a >>= s; r |= s;
s = (a > 0xf ) << 2; a >>= s; r |= s;
s = (a > 0x3 ) << 1; a >>= s; r |= s;
return (r | (a >> 1)) + 1;
#endif
}
// Count the number of trailing binary zeros in a
// lfs_ctz(0) may be undefined
static inline uint32_t lfs_ctz(uint32_t a) {
#if !defined(LFS_NO_INTRINSICS) && defined(__GNUC__)
return __builtin_ctz(a);
#else
return lfs_npw2((a & -a) + 1) - 1;
#endif
}
// Count the number of binary ones in a
static inline uint32_t lfs_popc(uint32_t a) {
#if !defined(LFS_NO_INTRINSICS) && (defined(__GNUC__) || defined(__CC_ARM))
return __builtin_popcount(a);
#else
a = a - ((a >> 1) & 0x55555555);
a = (a & 0x33333333) + ((a >> 2) & 0x33333333);
return (((a + (a >> 4)) & 0xf0f0f0f) * 0x1010101) >> 24;
#endif
}
// Find the sequence comparison of a and b, this is the distance
// between a and b ignoring overflow
static inline int lfs_scmp(uint32_t a, uint32_t b) {
return (int)(unsigned)(a - b);
}
// Convert between 32-bit little-endian and native order
static inline uint32_t lfs_fromle32(uint32_t a) {
#if !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && defined( ORDER_LITTLE_ENDIAN ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
(defined(__BYTE_ORDER ) && defined(__ORDER_LITTLE_ENDIAN ) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN ) || \
(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
return a;
#elif !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && defined( ORDER_BIG_ENDIAN ) && BYTE_ORDER == ORDER_BIG_ENDIAN ) || \
(defined(__BYTE_ORDER ) && defined(__ORDER_BIG_ENDIAN ) && __BYTE_ORDER == __ORDER_BIG_ENDIAN ) || \
(defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
return __builtin_bswap32(a);
#else
return (((uint8_t*)&a)[0] << 0) |
(((uint8_t*)&a)[1] << 8) |
(((uint8_t*)&a)[2] << 16) |
(((uint8_t*)&a)[3] << 24);
#endif
}
static inline uint32_t lfs_tole32(uint32_t a) {
return lfs_fromle32(a);
}
// Convert between 32-bit big-endian and native order
static inline uint32_t lfs_frombe32(uint32_t a) {
#if !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && defined( ORDER_LITTLE_ENDIAN ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
(defined(__BYTE_ORDER ) && defined(__ORDER_LITTLE_ENDIAN ) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN ) || \
(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
return __builtin_bswap32(a);
#elif !defined(LFS_NO_INTRINSICS) && ( \
(defined( BYTE_ORDER ) && defined( ORDER_BIG_ENDIAN ) && BYTE_ORDER == ORDER_BIG_ENDIAN ) || \
(defined(__BYTE_ORDER ) && defined(__ORDER_BIG_ENDIAN ) && __BYTE_ORDER == __ORDER_BIG_ENDIAN ) || \
(defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
return a;
#else
return (((uint8_t*)&a)[0] << 24) |
(((uint8_t*)&a)[1] << 16) |
(((uint8_t*)&a)[2] << 8) |
(((uint8_t*)&a)[3] << 0);
#endif
}
static inline uint32_t lfs_tobe32(uint32_t a) {
return lfs_frombe32(a);
}
// Calculate CRC-32 with polynomial = 0x04c11db7
uint32_t lfs_crc(uint32_t crc, const void *buffer, size_t size);
// Allocate memory, only used if buffers are not provided to littlefs
// Note, memory must be 64-bit aligned
static inline void *lfs_malloc(size_t size) {
#ifndef LFS_NO_MALLOC
return malloc(size);
#else
(void)size;
return NULL;
#endif
}
// Deallocate memory, only used if buffers are not provided to littlefs
static inline void lfs_free(void *p) {
#ifndef LFS_NO_MALLOC
free(p);
#else
(void)p;
#endif
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
#endif
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