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#include "mem.h"
#include <GLFW/glfw3.h>
#include "common.h"
#include "dyn_arr.h"
// Array to track temp allocations.
void **temp_allocations;
#ifdef UE_DEBUG
#include <execinfo.h>
#define BACKTRACE_SIZE 16
struct alloc {
void *ptr;
size_t size;
int backtrace_len;
char **backtrace;
};
int allocations_cap;
int allocations_len;
struct alloc *allocations;
#endif // UE_DEBUG
static
void *glfw_alloc(size_t size, void *user)
{
(void)user;
return mem_alloc(size);
}
static
void *glfw_realloc(void *block, size_t size, void *user)
{
(void)user;
return mem_realloc(block, size);
}
static
void glfw_dealloc(void *block, void *user)
{
(void)user;
mem_free(block);
}
void init_mem(void)
{
#ifdef UE_DEBUG
allocations_len = 0;
allocations_cap = 8;
allocations = malloc(sizeof(struct alloc) * 8);
if (!allocations)
log_fatal(ERR_MEM, "(%s) (track) ran out of memory", __func__);
#endif // UE_DEBUG
GLFWallocator glfw_allocator;
glfw_allocator.allocate = glfw_alloc;
glfw_allocator.reallocate = glfw_realloc;
glfw_allocator.deallocate = glfw_dealloc;
glfwInitAllocator(&glfw_allocator);
temp_allocations = da_create(void*, 0);
}
void deinit_mem(void)
{
da_free(temp_allocations);
#ifdef UE_DEBUG
fprintf(stderr, "%d allocations leaked\n", allocations_len);
for (int i = 0; i < allocations_len; i++) {
struct alloc *alloc = &allocations[i];
fprintf(
stderr,
"leaked %zu bytes at %p\n",
alloc->size,
alloc->ptr
);
for (int j = 0; j < alloc->backtrace_len; j++) {
fprintf(stderr, "\t%s\n", alloc->backtrace[j]);
}
putc('\n', stderr);
free(alloc->backtrace);
}
free(allocations);
if (allocations_len > 0)
exit(ERR_MEM_LEAK);
#endif // UE_DEBUG
}
void free_temp_allocs(void)
{
for (int i = 0; i < da_len(temp_allocations); i++) {
void *temp = temp_allocations[i];
mem_free(temp);
}
da_clear(temp_allocations);
}
void *mem_alloc(size_t size)
{
void *ptr = malloc(size);
if (!ptr)
log_fatal(ERR_MEM, "(%s) ran out of memory", __func__);
#ifdef UE_DEBUG
// Log allocation
struct alloc alloc;
void *bt[BACKTRACE_SIZE];
int bt_len = backtrace(bt, BACKTRACE_SIZE);
char **symbols = backtrace_symbols(bt, bt_len);
alloc.ptr = ptr;
alloc.size = size;
alloc.backtrace_len = bt_len;
alloc.backtrace = symbols;
if (allocations_len + 1 > allocations_cap) {
allocations_cap *= 2;
allocations = realloc(
allocations,
sizeof(struct alloc) * allocations_cap
);
if (!allocations)
log_fatal(
ERR_MEM,
"(%s) (track) ran out of memory",
__func__
);
}
allocations[allocations_len++] = alloc;
#endif // UE_DEBUG
return ptr;
}
void *mem_realloc(void *ptr, size_t new_size)
{
if (new_size == 0) {
mem_free(ptr);
return NULL;
}
void *new_ptr = realloc(ptr, new_size);
if (!new_ptr)
log_fatal(ERR_MEM, "(%s) ran out of memory", __func__);
#ifdef UE_DEBUG
for (int i = 0; i < allocations_len; i++) {
struct alloc *alloc = &allocations[i];
if (alloc->ptr == ptr) {
alloc->ptr = new_ptr;
alloc->size = new_size;
break;
}
}
#endif // UE_DEBUG
return new_ptr;
}
void *mem_talloc(size_t size)
{
void *ptr = mem_alloc(size);
da_append(void*, &temp_allocations, ptr);
return ptr;
}
void mem_free(void *ptr)
{
free(ptr);
#ifdef UE_DEBUG
for (int i = 0; i < allocations_len; i++) {
struct alloc *alloc = &allocations[i];
if (alloc->ptr == ptr) {
free(alloc->backtrace);
*alloc = allocations[allocations_len - 1];
allocations_len--;
break;
}
}
#endif // UE_DEBUG
}
int alloc_count(void)
{
#ifdef UE_DEBUG
return allocations_len;
#else
return -1;
#endif
}
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