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arena allocator
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This commit is contained in:
Evan Burkey 2024-07-16 10:49:08 -07:00
parent 0c97ba45b1
commit 59fee5094b
15 changed files with 270 additions and 123 deletions
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8
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flint

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1
CMakeLists.txt
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@ -22,6 +22,7 @@ set(SOURCES
src/crypto.c
src/parsing.c
src/network.c
src/memory.c
)
if ((${CMAKE_SYSTEM_NAME} STREQUAL "Darwin"))

8
docs/math.md
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@ -57,3 +57,11 @@ Works the same as `bresenham()` but uses the `Point` struct instead of `int`
```c
Point *bresenham_p(Point p1, Point p2, size_t *sz);
```
## is_power_of_two
Returns `1` if `i` is a power of two, otherwise returns `1`.
```c
int is_power_of_two(int i);
```

99
docs/memory.md Normal file
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@ -0,0 +1,99 @@
# memory
Custom allocators and memory functions
# Arena Allocator
A simple arena-style allocator
## Structs
### ArenaAllocator
Represents an arena allocator. `ArenaAllocator` holds its own buffer, but managing its size is left to the user. Like
most structs in `libflint`, it must be malloced first before being passed to `arena_init()`.
```c
typedef struct {
unsigned char* buf;
size_t buf_sz;
size_t offset_cur;
size_t offset_prev;
} ArenaAllocator;
```
## Functions
### arena_init
Initializes the `ArenaAllocator`. The struct must first be created by the user using `malloc()`, see the example below.
`buf_sz` is the size of the underlying buffer in bytes.
```c
void arena_init(ArenaAllocator *allocator, size_t buf_sz);
/* Usage */
ArenaAllocator *a = malloc(sizeof(ArenaAllocator));
arena_init(a, 1024);
```
### arena_free
Frees `allocator` and its underlying buffer. Users should set `allocator` to `NULL` after calling `arena_free()`.
```c
void arena_free(ArenaAllocator *allocator);
/* Usage */
arena_free(allocator);
allocator = NULL;
```
### arena_clear
Resets the offset markers of the arena to `0`, but does not wipe the underlying buffer. Technically, any assigned pointers
will still work and
```c
void arena_clear(ArenaAllocator *allocator);
```
### *arena_malloc
Request memory of `size` bytes in length from the arena. Returns `NULL` if the assignment failed.
```c
void *arena_malloc(ArenaAllocator* allocator, size_t size);
```
### arena_resize_buf
Reallocates the underlying buffer in the arena to `new_sz`. You can grow or shrink the arena using this function. Any
pointers allocated out of the arena are invalid after using this function.
```c
void arena_resize_buf(ArenaAllocator *allocator, size_t new_sz);
```
### *arena_resize
Resize an allocated pointer from the arena. See the example below for a simple use case
```c
void *arena_resize(ArenaAllocator *allocator, void *mem, size_t old_sz, size_t new_sz);
/* Usage */
int *i = arena_malloc(a, sizeof(int));
*i = 1;
long *l = arena_resize(a, i1, sizeof(int), sizeof(long));
assert(*l == 1);
```
## Macros
### arena_sz
Convenience macro for getting the size of the arena's buffer
```c
#define arena_sz(a) (a)->buf_sz
```

4
include/lfmath.h
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@ -1,6 +1,8 @@
#ifndef LIBFLINT_H_MATH
#define LIBFLINT_H_MATH
#include <stddef.h>
#include "lfutility.h"
int max_int(int a, int b);
@ -11,6 +13,8 @@ int clamp_int(int i, int low, int high);
int binstr_to_int(const char *s);
int is_power_of_two(int i);
Point *bresenham(int x0, int y0, int x1, int y1, size_t *sz);
Point *bresenham_p(Point p1, Point p2, size_t *sz);

20
include/lfmemory.h Normal file
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@ -0,0 +1,20 @@
#ifndef LIBFLINT_H_MEMORY
#define LIBFLINT_H_MEMORY
#include <stddef.h>
typedef struct {
unsigned char* buf;
size_t buf_sz;
size_t offset_cur;
size_t offset_prev;
} ArenaAllocator;
void arena_init(ArenaAllocator *allocator, size_t buf_sz);
void arena_free(ArenaAllocator *allocator);
void *arena_malloc(ArenaAllocator* allocator, size_t size);
void arena_resize_buf(ArenaAllocator *allocator, size_t new_sz);
void *arena_resize(ArenaAllocator *allocator, void *mem, size_t old_sz, size_t new_sz);
void arena_clear(ArenaAllocator *allocator);
#endif // LIBFLINT_H_MEMORY

3
src/math.c
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@ -77,3 +77,6 @@ Point *bresenham_p(Point p1, Point p2, size_t *sz) {
return bresenham(p1.x, p1.y, p2.x, p2.y, sz);
}
int is_power_of_two(int i) {
return (i & (i - 1)) == 0;
}

109
src/memory.c Normal file
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@ -0,0 +1,109 @@
#include <lfmath.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include "lfmemory.h"
#define arena_sz(a) (a)->buf_sz
void arena_init(ArenaAllocator *allocator, size_t buf_sz) {
if (allocator == NULL) {
return;
}
allocator->buf = malloc(sizeof(unsigned char) * buf_sz);
allocator->buf_sz = buf_sz;
allocator->offset_cur = 0;
allocator->offset_prev = 0;
}
void arena_free(ArenaAllocator *allocator) {
free(allocator->buf);
free(allocator);
}
void arena_clear(ArenaAllocator *allocator) {
allocator->offset_cur = 0;
allocator->offset_prev = 0;
}
static uintptr_t align_forward(uintptr_t ptr, size_t align) {
uintptr_t p, a, m;
if (!is_power_of_two(align)) {
// TODO: Error
}
p = ptr;
a = (uintptr_t)align;
m = p & (a - 1);
if (m != 0) {
p += a - m;
}
return p;
}
static void *arena_malloc_align(ArenaAllocator *allocator, size_t size, size_t align) {
uintptr_t cur_ptr = (uintptr_t)allocator->buf + (uintptr_t)allocator->offset_cur;
// Push forward to align, then change to relative offset
uintptr_t offset = align_forward(cur_ptr, align);
offset -= (uintptr_t)allocator->buf;
if (offset + size <= allocator->buf_sz) {
void *ptr = &allocator->buf[offset];
allocator->offset_prev = offset;
allocator->offset_cur = offset + size;
memset(ptr, 0, size);
return ptr;
}
// Arena is full
return NULL;
}
static void *arena_resize_align(ArenaAllocator *allocator, void *mem, size_t old_sz, size_t new_sz, size_t align) {
unsigned char *old_mem = (unsigned char *)mem;
if (!is_power_of_two(align)) {
// TODO: Error handling
}
if (old_mem == NULL || old_sz == 0) {
return arena_malloc_align(allocator, new_sz, align);
}
if (allocator->buf <= mem && mem < allocator->buf + allocator->buf_sz) {
if (allocator->buf + allocator->offset_prev == old_mem) {
allocator->offset_cur = allocator->offset_prev + new_sz;
if (new_sz > old_sz) {
// Zero out memory
memset(&allocator->buf[allocator->offset_cur], 0, new_sz - old_sz);
}
return old_mem;
}
void *new_mem = arena_malloc_align(allocator, new_sz, align);
size_t copy_size = old_sz < new_sz ? old_sz : new_sz;
memmove(new_mem, old_mem, copy_size);
return new_mem;
}
return NULL;
}
void arena_resize_buf(ArenaAllocator *allocator, size_t new_sz) {
allocator->buf = realloc(allocator->buf, sizeof(unsigned char) * new_sz);
}
#ifndef DEFAULT_ALIGNMENT
#define DEFAULT_ALIGNMENT (2*sizeof(void*))
#endif // DEFAULT_ALIGNMENT
void *arena_malloc(ArenaAllocator *allocator, size_t size) {
return arena_malloc_align(allocator, size, DEFAULT_ALIGNMENT);
}
void *arena_resize(ArenaAllocator *allocator, void *mem, size_t old_sz, size_t new_sz) {
return arena_resize_align(allocator, mem, old_sz, new_sz, DEFAULT_ALIGNMENT);
}

26
tests/tests.c
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@ -16,6 +16,7 @@
#include "lfcrypto.h"
#include "lfparsing.h"
#include "lfinput.h"
#include "lfmemory.h"
#if defined(__APPLE__) || defined(__MACH__)
#include "lfmacos.h"
@ -468,6 +469,30 @@ void test_macos() {
}
#endif
void test_memory() {
printf("\n--- MEMORY TEST ---\n");
ArenaAllocator *a = malloc(sizeof(ArenaAllocator));
arena_init(a, 1024);
int *i1 = arena_malloc(a, sizeof(int));
int *i2 = arena_malloc(a, sizeof(int));
*i1 = 1;
*i2 = 2;
assert(i1 < i2);
assert(*i1 < *i2);
long *l = arena_resize(a, i1, sizeof(int), sizeof(long));
assert(*l == 1);
unsigned char *c = arena_resize(a, i2, sizeof(int), sizeof(unsigned char));
assert(*c == 2);
arena_free(a);
printf("Passes all memory tests\n");
}
int main() {
test_ll();
test_set();
@ -479,6 +504,7 @@ int main() {
test_crypto();
test_parsing();
test_network();
test_memory();
#if defined(__APPLE__) || defined(__MACH__)
test_macos();