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Rewrote allocator/allocation interface to track individual allocations and sizes

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This commit is contained in:
Justin R. Cutler 2016-04-03 20:52:32 -04:00
parent 682d8484e0
commit 2777a2d44e
9 changed files with 228 additions and 130 deletions
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4
CMakeLists.txt
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@ -2,8 +2,12 @@ cmake_minimum_required(VERSION 3.5)
set(CMAKE_C_FLAGS "-Wall -Wextra -pedantic -Werror -std=c99")
add_library (allocation src/allocation.c)
target_include_directories (allocation PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
add_library (coroutine src/coroutine.c)
target_include_directories (coroutine PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries (coroutine LINK_PUBLIC allocation)
add_executable (test-coroutine test/coroutine.c src/default_allocator.c)
target_include_directories (coroutine PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

42
src/allocation.c Normal file
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@ -0,0 +1,42 @@
/* threadless.io
* Copyright (c) 2016 Justin R. Cutler
* Licensed under the MIT License. See LICENSE file in the project root for
* full license information.
*/
/** @file
* allocation interface implementation
* @author Justin R. Cutler <justin.r.cutler@gmail.com>
*/
/* errno, ENOMEM */
#include <errno.h>
/* size_t, NULL */
#include <stddef.h>
/* ... */
#include <threadless/allocation.h>
#ifndef SIZE_MAX
# define SIZE_MAX ((size_t)-1)
#endif
#define SQRT_SIZE_MAX_PLUS_1 ((size_t)1 << (sizeof(size_t) * 4))
int allocation_realloc_array(allocation_t *allocation, size_t nmemb,
size_t size)
{
/* test for multiplication overflow */
if (((nmemb >= SQRT_SIZE_MAX_PLUS_1) || (size >= SQRT_SIZE_MAX_PLUS_1)) &&
(nmemb != 0) && ((SIZE_MAX / nmemb) < size)) {
/* overflow detected */
errno = ENOMEM;
return -1;
}
size_t alloc_size = nmemb * size;
/* perform allocator action */
return allocation->allocator->allocate(allocation, alloc_size);
}

25
src/coroutine.c
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@ -19,6 +19,8 @@
/* ucontext_t, getcontext, makecontext, swapcontext */
#include <ucontext.h>
/* allocator_t allocation_t, allocation_init, allocation_realloc_array */
#include <threadless/allocation.h>
/* ... */
#include <threadless/coroutine.h>
@ -29,11 +31,11 @@ enum {
struct coroutine {
allocator_t *allocator;
ucontext_t context;
ucontext_t caller;
void *data;
int status;
allocation_t allocation;
ucontext_t context;
ucontext_t caller;
void *data;
int status;
};
@ -67,13 +69,15 @@ coroutine_t *coroutine_create(allocator_t *allocator,
goto fail;
}
coro = allocator_malloc(allocator, alloc_size);
if (NULL == coro) {
allocation_t allocation;
allocation_init(&allocation, allocator);
if (allocation_realloc_array(&allocation, 1, alloc_size)) {
goto fail;
}
coro = allocation.memory;
memset(coro, 0, alloc_size);
coro->allocator = allocator;
coro->allocation = allocation;
(void) getcontext(&coro->context);
coro->context.uc_stack.ss_sp = coro + 1;
coro->context.uc_stack.ss_size = stack_size;
@ -92,8 +96,9 @@ fail:
void coroutine_destroy(coroutine_t *coro)
{
if (NULL != coro && NULL != coro->allocator) {
allocator_free(coro->allocator, coro);
if (NULL != coro) {
allocation_t allocation = coro->allocation;
allocation_free(&allocation);
}
}

39
src/default_allocator.c
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@ -7,36 +7,31 @@
* default allocator implementation
* @author Justin R. Cutler <justin.r.cutler@gmail.com>
*/
/* errno, ENOMEM */
#include <errno.h>
/* realloc */
#include <stdlib.h>
/* ... */
#include <threadless/allocator.h>
#include <threadless/default_allocator.h>
#ifndef SIZE_MAX
# define SIZE_MAX ((size_t)-1)
#endif
#define SQRT_SIZE_MAX_PLUS_1 ((size_t)1 << (sizeof(size_t) * 4))
static void *default_allocate(allocator_t *allocator, void *ptr, size_t nmemb,
size_t size)
static int default_allocate(allocation_t *allocation, size_t size)
{
/* ignore allocator */
(void) allocator;
/* test for multiplication overflow */
if (((nmemb >= SQRT_SIZE_MAX_PLUS_1) || (size >= SQRT_SIZE_MAX_PLUS_1)) &&
(nmemb != 0) && ((SIZE_MAX / nmemb) < size)) {
/* overflow detected */
errno = ENOMEM;
return NULL;
}
void *new_memory;
/* perform allocator action */
return realloc(ptr, size * nmemb);
new_memory = realloc(allocation->memory, size);
if ((NULL == new_memory) && (size != 0)) {
/* realloc failed */
return -1;
}
/* update allocation */
allocation->memory = new_memory;
allocation->size = size;
return 0;
}

2
test/coroutine.c
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@ -14,7 +14,7 @@
#include <stdlib.h>
/* allocator_t, allocator_get_default, allocator_destroy */
#include <threadless/allocator.h>
#include <threadless/default_allocator.h>
/* ... */
#include <threadless/coroutine.h>

119
threadless/allocation.h Normal file
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@ -0,0 +1,119 @@
/* threadless.io
* Copyright (c) 2016 Justin R. Cutler
* Licensed under the MIT License. See LICENSE file in the project root for
* full license information.
*/
/** @file
* allocation interface definition
* @author Justin R. Cutler <justin.r.cutler@gmail.com>
*/
#ifndef THREADLESS_ALLOCATION_H
#define THREADLESS_ALLOCATION_H
/* size_t, NULL */
#include <stddef.h>
/** Memory allocator instance */
typedef struct allocator allocator_t;
/** Memory allocation handle */
typedef struct {
/** allocator used to manage this memory */
allocator_t *allocator;
/** pointer to allocated memory */
void *memory;
/** current size of allocated memory */
size_t size;
} allocation_t;
/** Memory allocator function
* @param[in,out] allocation memory allocation handle
* @param size minimum new size of memory (or 0 to free)
* @retval 0 success
* @retval -1 error
* @pre @p allocation must be initialized
* @pre If @p allocation->memory is @c NULL and @p allocation->size is
* non-zero, function shall allocate new memory
* @pre If @p size is 0, function shall free allocated memory
* @post Upon success, @p allocation has been updated to reflect changes
* @post Upon failure, @p allocation has not been changed
*/
typedef int (allocator_function_t)(allocation_t *allocation, size_t size);
/** Memory allocator destructor function
* @param[in,out] allocator allocator instance
* @post @p allocator may no longer be used
*/
typedef void (allocator_destroy_function_t)(allocator_t *allocator);
/** Memory allocator instance structure */
struct allocator {
/** Memory (re)allocator function */
allocator_function_t *const allocate;
/** Memory allocator instance destructor */
allocator_destroy_function_t *const destroy;
};
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** Initialize an allocation handle
* @param[out] allocation allocation
* @param allocator allocator instance
* @pre @p allocation must be initialized
* @post @p allocation->allocator has been set to @p allocator,
* @p allocation->memory has been set to @c NULL, and @p allocation->size
* has been set to 0
*/
static inline void allocation_init(allocation_t *allocation,
allocator_t *allocator)
{
allocation->allocator = allocator;
allocation->memory = NULL;
allocation->size = 0;
}
/** @c realloc_array() helper function
* @param[in,out] allocation memory allocation handle
* @param nmemb number of elements to allocate (or 0 to free)
* @param size size of each element to allocate (or 0 to free)
* @retval 0 success
* @retval -1 error
* @pre @p allocation must point to an initialized, valid allocation
* @pre If @p allocation->memory is @c NULL, function shall allocate new
* memory
* @pre If @p nmemb or @p size is 0, function shall free allocated memory
* @post Upon success, @p allocation->memory and @p allocation->size have been
* updated to reflect changes
* @post Upon failure, @p allocation has not been changed
* @note Upon detection of integer overflow, this function shall return
* @c NULL (like @c calloc(3) and FreeBSD's @c realloc_array(3))
*/
int allocation_realloc_array(allocation_t *allocation, size_t nmemb,
size_t size);
/** @c free() helper function
* @param[in,out] allocation memory allocation handle
* @pre @p allocation must point to an initialized, valid allocation
* @post @p allocation->memory is set to @c NULL and @p allocation->size is set
* to 0
*/
static inline void allocation_free(allocation_t *allocation)
{
(void) allocation_realloc_array(allocation, 0, 0);
}
/** Memory allocator destructor helper function
* @copydetails allocator_destroy_function_t
*/
static inline void allocator_destroy(allocator_t *allocator)
{
allocator->destroy(allocator);
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* THREADLESS_ALLOCATOR_H */

96
threadless/allocator.h
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@ -1,96 +0,0 @@
/* threadless.io
* Copyright (c) 2016 Justin R. Cutler
* Licensed under the MIT License. See LICENSE file in the project root for
* full license information.
*/
/** @file
* allocator interface definition
* @author Justin R. Cutler <justin.r.cutler@gmail.com>
*/
#ifndef THREADLESS_ALLOCATOR_H
#define THREADLESS_ALLOCATOR_H
/* size_t, NULL */
#include <stddef.h>
/** Memory allocator instance */
typedef struct allocator allocator_t;
/** Memory allocator function
* @param[in,out] allocator allocator instance
* @param[in,out] ptr memory to reallocate/free (or @c NULL to allocate)
* @param nmemb number of elements to allocate (or 0 to free)
* @param size size of each element to allocate (or 0 to free)
* @retval non-NULL successful allocation/reallocation
* @retval NULL successful free (@p nmemb or @p size was 0) or error
* @note Upon detection of integer overflow, this function shall return
* @c NULL (like @c calloc(3) and FreeBSD's @c realloc_array(3))
*/
typedef void *(allocator_function_t)(allocator_t *allocator, void *ptr,
size_t nmemb, size_t size);
/** Memory allocator destructor function
* @param[in,out] allocator allocator instance
* @post @p allocator may no longer be used
*/
typedef void (allocator_destroy_function_t)(allocator_t *allocator);
/** Memory allocator instance structure */
struct allocator {
/** Memory allocator function */
allocator_function_t *const allocate;
/** Memory allocator instance destructor */
allocator_destroy_function_t *const destroy;
};
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** Get default allocator instance
* @returns default allocator
*/
allocator_t *allocator_get_default(void);
/** @c malloc() helper function
* @param[in,out] allocator allocator
* @param size size to allocate
* @retval Non-NULL allocated memory
* @retval NULL error
*/
static inline void *allocator_malloc(allocator_t *allocator, size_t size)
{
return allocator->allocate(allocator, NULL, 1, size);
}
/** @c realloc_array() helper function
* @copydetails allocator_function_t
*/
static inline void *allocator_realloc_array(allocator_t *allocator, void *ptr,
size_t nmemb, size_t size)
{
return allocator->allocate(allocator, ptr, nmemb, size);
}
/** @c free() helper function
* @param[in,out] allocator allocator
* @param ptr memory to free
*/
static inline void allocator_free(allocator_t *allocator, void *ptr)
{
(void) allocator->allocate(allocator, ptr, 0, 0);
}
/** Memory allocator destructor helper function
* @copydetails allocator_destroy_function_t
*/
static inline void allocator_destroy(allocator_t *allocator)
{
allocator->destroy(allocator);
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* THREADLESS_ALLOCATOR_H */

2
threadless/coroutine.h
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@ -16,7 +16,7 @@
#include <stddef.h>
/* allocator_t */
#include <threadless/allocator.h>
#include <threadless/allocation.h>
/** Opaque coroutine type */
typedef struct coroutine coroutine_t;

29
threadless/default_allocator.h Normal file
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@ -0,0 +1,29 @@
/* threadless.io
* Copyright (c) 2016 Justin R. Cutler
* Licensed under the MIT License. See LICENSE file in the project root for
* full license information.
*/
/** @file
* allocator interface definition
* @author Justin R. Cutler <justin.r.cutler@gmail.com>
*/
#ifndef THREADLESS_DEFAULT_ALLOCATOR_H
#define THREADLESS_DEFAULT_ALLOCATOR_H
/* allocator_t */
#include <threadless/allocation.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** Get default allocator instance
* @returns default allocator
*/
allocator_t *allocator_get_default(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* THREADLESS_DEFAULT_ALLOCATOR_H */