Fix and Free

Added the ability to free data from a zone. Also made some fixes to make
sure that our numbers format properly in print statements.

.gitignore

@@ -54,3 +54,6 @@ dkms.conf
 
 # Ignore /build directory from cmake
 build/
+
+# Ignore the .cache/ directory that clangd gernates
+.cache/

CMakeLists.txt

@@ -4,6 +4,7 @@ project(quantum-utils)
 
 set(quantum-src "./quantum/src/")
 set(test_stuff-src "./test_stuff/src/")
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 add_library(quantum SHARED ${quantum-src}memory/zone.c)
 add_executable(test_stuff ${test_stuff-src}main.c)

quantum/src/defines.h

@@ -1,7 +1,7 @@
 #pragma once
 
-#include <inttypes.h>
 #include <assert.h>
+#include <inttypes.h>
 
 typedef int16_t i16;
 typedef uint16_t u16;
@@ -12,12 +12,11 @@ typedef uint64_t u64;
 typedef float f32;
 typedef double f64;
 
-static_assert(sizeof(i16) == 2);
+static_assert(sizeof(i16) == 2, "");
-static_assert(sizeof(u16) == 2);
+static_assert(sizeof(u16) == 2, "");
-static_assert(sizeof(i32) == 4);
+static_assert(sizeof(i32) == 4, "");
-static_assert(sizeof(u32) == 4);
+static_assert(sizeof(u32) == 4, "");
-static_assert(sizeof(i64) == 8);
+static_assert(sizeof(i64) == 8, "");
-static_assert(sizeof(u64) == 8);
+static_assert(sizeof(u64) == 8, "");
-static_assert(sizeof(f32) == 4);
+static_assert(sizeof(f32) == 4, "");
-static_assert(sizeof(f64) == 8);
+static_assert(sizeof(f64) == 8, "");
-

quantum/src/memory/zone.c

@@ -1,5 +1,6 @@
+#include <stdio.h>  // printf()
 #include <stdlib.h> // malloc() free()
-#include <stdio.h> // printf()
+#include <string.h>
 
 #include "../defines.h"
 #include "zone.h"
@@ -9,7 +10,7 @@ typedef struct ZoneHeader {
   u64 cur_size;
 } ZoneHeader;
 
-Zone * zoneCreate(size_t sizeBytes) {
+Zone *zoneCreate(size_t sizeBytes) {
   // First we need to get a block of memory from the OS
   // This block needs to include the size of what we want to store
   // plus the size of our ZoneHeader
@@ -27,7 +28,7 @@ Zone * zoneCreate(size_t sizeBytes) {
   return zone_addr;
 }
 
-void * zoneAlloc(Zone *zone, size_t sizeBytes) {
+void *zoneAlloc(Zone *zone, size_t sizeBytes) {
   ZoneHeader *zone_header = (ZoneHeader *)zone - sizeof(ZoneHeader);
 
   if (zone_header->cur_size + sizeBytes > zone_header->capacity) {
@@ -40,20 +41,38 @@ void * zoneAlloc(Zone *zone, size_t sizeBytes) {
   zone_header->cur_size += sizeBytes;
 
   printf("Zone Header Information:\n");
-  printf("Current Size: %u\n", zone_header->cur_size);
+  printf("Current Size: %" PRIu64 "\n", zone_header->cur_size);
-  printf("Total Capacity: %u\n", zone_header->capacity);
+  printf("Total Capacity: %" PRIu64 "\n", zone_header->capacity);
 
   return new_mem;
 }
 
+void zoneFree(void *data, size_t dataSize) {
+  // TODO: We want to eventually pass in a pointer to the zone so we can track
+  // our free blocks
+
+  // Lets first check to make sure we weren't given a NULL pointer
+  if (data == NULL)
+    return;
+
+  // First we need to set the memory starting at `data` and going to `dataSize`
+  // to 0
+  memset(data, 0, dataSize);
+
+  // Now we need to null the pointer
+  data = NULL;
+
+  // TODO: Add logic to alert that this space can now be used
+}
+
 void zoneClear(Zone *zone) {
   ZoneHeader *zone_header = (ZoneHeader *)zone - sizeof(ZoneHeader);
 
   zone_header->cur_size = 0;
 
   printf("Zone Header Information:\n");
-  printf("Current Size: %u\n", zone_header->cur_size);
+  printf("Current Size: %" PRIu64 "\n", zone_header->cur_size);
-  printf("Total Capacity: %u\n", zone_header->capacity);
+  printf("Total Capacity: %" PRIu64 "\n", zone_header->capacity);
 }
 
 void zoneDestroy(Zone *zone) {

quantum/src/memory/zone.h

@@ -1,13 +1,13 @@
 #pragma once
 
-#include <stddef.h>   // size_t definition
+#include <stddef.h> // size_t definition
 
 #include "../defines.h"
 
 typedef struct _Zone Zone;
 
-Zone * zoneCreate(size_t sizeBytes);
+Zone *zoneCreate(size_t sizeBytes);
-void * zoneAlloc(Zone *zone, size_t sizeBytes);
+void *zoneAlloc(Zone *zone, size_t sizeBytes);
+void zoneFree(void *data, size_t dataSize);
 void zoneClear(Zone *zone);
 void zoneDestroy(Zone *zone);
-

test_stuff/src/main.c

@@ -3,14 +3,14 @@
 #include <stdio.h>
 
 int main() {
-  printf("Size of i16: %i\n", sizeof(i16));
+  printf("Size of i16: %" PRId16 "\n", sizeof(i16));
-  printf("Size of u16: %i\n", sizeof(u16));
+  printf("Size of u16: %" PRIu16 "\n", sizeof(u16));
-  printf("Size of i32: %i\n", sizeof(i32));
+  printf("Size of i32: %" PRId32 "\n", sizeof(i32));
-  printf("Size of u32: %i\n", sizeof(u32));
+  printf("Size of u32: %" PRIu32 "\n", sizeof(u32));
-  printf("Size of i64: %i\n", sizeof(i64));
+  printf("Size of i64: %" PRId64 "\n", sizeof(i64));
-  printf("Size of u64: %i\n", sizeof(u64));
+  printf("Size of u64: %" PRIu64 "\n", sizeof(u64));
-  printf("Size of f32: %i\n", sizeof(f32));
+  printf("Size of f32: %lu\n", sizeof(f32));
-  printf("Size of f64: %i\n", sizeof(f64));
+  printf("Size of f64: %lu\n", sizeof(f64));
 
   printf("\nCreating new zone 4K in size...\n");
   Zone *test_zone = zoneCreate(4096);
@@ -20,11 +20,29 @@ int main() {
 
   printf("Address of test_zone: %p\n", (void *)test_zone);
   printf("Address of test_alloc: %p\n", test_alloc);
-  printf("Address of test_alloc2: %p\n", test_alloc2);
+  printf("Address of test_alloc2: %p\n\n", test_alloc2);
 
   zoneClear(test_zone);
 
+  u64 *test_free = zoneAlloc(test_zone, sizeof(u64));
+
+  printf("Address of test_free: %p\n", (void *)test_free);
+  printf("Freeing test_free...\n");
+
+  zoneFree(&test_free, sizeof(u64));
+
+  printf("Is test_free NULL: %s\n\n", test_free == NULL ? "true" : "false");
+
   zoneDestroy(test_zone);
 
+  const u64 FOUR_GIGS = (u64)4 * 1024 * 1024 * 1024;
+
+  Zone *break_zone = zoneCreate(FOUR_GIGS);
+
+  while (zoneAlloc(break_zone, 1024 * 1024 * 1024) != NULL) {
+  }
+
+  zoneDestroy(break_zone);
+
   return 0;
 }