Ditch dlmalloc in favour of custom umalloc

ulib/Makefile

@@ -10,12 +10,12 @@ SRCFILES := $(call GRABSRC, \
 							string \
 							system \
 							printf \
-							dlmalloc \
 							sync \
 							args \
 							util \
 							ubsan \
 							write \
+							umalloc \
 						)
 
 CFLAGS += -isystem $(ROOT)/share -isystem $(ROOT)/ulib -isystem $(ROOT)/std/include \

ulib/_premain.c

@@ -4,10 +4,10 @@
 #include <sysdefs/processctl.h>
 #include <sysdefs/devctl.h>
 #include <errors.h>
-#include <dlmalloc/malloc.h>
 #include <uprintf.h>
 #include <log.h>
 #include <util/util.h>
+#include <umalloc/umalloc.h>
 #include <devids.h>
 
 extern void main(void);
@@ -43,7 +43,7 @@ void _premain(void) {
   devctl(&termdev, DEVCTL_GET_HANDLE, (uint8_t *)DEV_TERMDEV, 0, 0);
 
   for (size_t i = 0; i < ARRLEN(_args); i++) {
-    _args[i] = dlmalloc(PROC_ARG_MAX);
+    _args[i] = umalloc(PROC_ARG_MAX);
   }
 
   processctl(-1, PCTL_ARGV, (uint64_t)&_argslen, (uint64_t)_args, MAX_ARGS);

ulib/dlmalloc/dlmalloc_port.inc

@@ -1,93 +0,0 @@
-// Config
-
-#include <stddef.h>
-#include <dlmalloc/malloc.h>
-#include <uprintf.h>
-#include <errors.h>
-#include <sync/spinlock.h>
-#include <string/string.h>
-#include <sysdefs/mman.h>
-#include <system/system.h>
-#include <write/write.h>
-
-#define USE_DL_PREFIX 1
-#define LACKS_SYS_TYPES_H 1
-#define NO_MALLOC_STATS 1
-#define LACKS_ERRNO_H 1
-#define LACKS_TIME_H 1
-#define LACKS_STDLIB_H 1
-#define LACKS_SYS_MMAN_H 1
-#define LACKS_FCNTL_H 1
-#define LACKS_UNISTD_H 1
-#define LACKS_SYS_PARAM_H 1
-#define LACKS_STRINGS_H 1
-#define LACKS_SCHED_H 1
-#define HAVE_MMAP 1
-#define HAVE_MORECORE 0
-#define ABORT writefmt("dlmalloc: Aborting...\n")
-#define MALLOC_FAILURE_ACTION
-#define USE_LOCKS 2
-#define malloc_getpagesize 0x1000
-#define EINVAL E_INVALIDARGUMENT
-#define ENOMEM E_NOMEMORY
-
-#define MLOCK_T SpinLock
-
-int ACQUIRE_LOCK(SpinLock *sl) {
-  spinlock_acquire(sl);
-  return 0;
-}
-
-int RELEASE_LOCK(SpinLock *sl) {
-  spinlock_release(sl);
-  return 0;
-}
-
-int INITIAL_LOCK(SpinLock *sl) {
-  spinlock_init(sl);
-  return 0;
-}
-    
-static MLOCK_T malloc_global_mutex = { 0 };
-
-#define PAGE_SIZE 0x1000
-
-static size_t _roundpage(size_t sz) {
-  return (sz + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
-}
-
-#define MAP_PRIVATE 0
-#define PROT_READ 0
-#define PROT_WRITE 0
-#define O_RDWR 0
-
-#define EMUL_DEV_ZERO_FD 123
-#define EMUL_MAP_FAILED ((void *)-1)
-
-int open(const char *path, int flags, ...) {
-  return EMUL_DEV_ZERO_FD;
-}
-
-void *mmap(void *addr, size_t len, int prot, int flags, int fd, int off) {
-  (void)off;
-  uint8_t *outaddr = NULL;
-  size_t need = _roundpage(len);
-
-  int32_t err = mman_map(NULL, need, MMAN_MAP_PF_RW, 0, &outaddr);
-  if (err != E_OK || outaddr == NULL) {
-    return EMUL_MAP_FAILED;
-  }
-
-  if (fd == EMUL_DEV_ZERO_FD) {
-    string_memset(outaddr, 0, need);
-  }
-
-  return outaddr;
-}
-
-int munmap(void *addr, size_t len) {
-  (void)len;
-  mman_unmap((uint8_t *)addr);
-  return 0;
-}
-

ulib/dlmalloc/malloc.c

@@ -1 +0,0 @@
-../../dlmalloc/malloc.c

ulib/dlmalloc/malloc.h

@@ -1 +0,0 @@
-../../dlmalloc/malloc.h

ulib/string/string.c

@@ -1,6 +1,6 @@
 #include <stddef.h>
 #include <string/string.h>
-#include <dlmalloc/malloc.h>
+#include <umalloc/umalloc.h>
 
 size_t string_len(const char *s) {
   size_t l = 0;
@@ -140,7 +140,7 @@ char *string_tokenizealloc(char *s, char *delim) {
     return NULL;
   }
 
-  char *w = (char *)dlmalloc(sizeof(char) * STRING_TOKENIZEALLOC_TOK_SIZE);
+  char *w = (char *)umalloc(sizeof(char) * STRING_TOKENIZEALLOC_TOK_SIZE);
   string_memset(w, 0, sizeof(char) * STRING_TOKENIZEALLOC_TOK_SIZE);
   int i = curridx, k = 0, j = 0;
 

ulib/ulib.h

@@ -3,7 +3,6 @@
 
 #include <ansiq/all.h>
 #include <args/args.h>
-#include <dlmalloc/malloc.h>
 #include <string/string.h>
 #include <string/char.h>
 #include <sync/spinlock.h>
@@ -15,6 +14,7 @@
 #include <log.h>
 #include <assert.h>
 #include <write/write.h>
+#include <umalloc/umalloc.h>
 
 #include <errors.h>
 #include <sysdefs/ioctl.h>

ulib/umalloc/umalloc.c

@@ -0,0 +1,89 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <umalloc/umalloc.h>
+#include <sysdefs/mman.h>
+#include <system/system.h>
+#include <errors.h>
+#include <linklist.h>
+#include <string/string.h>
+#include <write/write.h>
+
+#define ARENA_SIZE (1<<20)
+
+typedef struct UmArena {
+  struct UmArena *next;
+  uintptr_t mem;
+  size_t cursor;
+  int64_t balance;
+} UmArena;
+
+static UmArena *ARENAS = NULL;
+
+UmArena *um_newarena(void) {
+  size_t arenasize = ARENA_SIZE;
+
+  uint8_t *mem = NULL;
+  int32_t err = mman_map(NULL, arenasize, MMAN_MAP_PF_RW, 0, &mem);
+  if (mem == NULL || err != E_OK) {
+    return NULL;
+  }
+  string_memset(mem, 0, arenasize);
+
+  UmArena *arena = (UmArena *)mem;
+  arena->mem = (uintptr_t)mem + sizeof(arena);
+  arena->cursor = 0;
+  LL_APPEND(ARENAS, arena);
+
+  return arena;
+}
+
+void *umalloc(size_t size) {
+  UmArena *usable = NULL;
+
+  UmArena *arena, *arenatmp;
+  LL_FOREACH_SAFE(ARENAS, arena, arenatmp) {
+    if (arena->cursor + size < ARENA_SIZE) {
+      usable = arena;
+      break;
+    }
+  }
+
+  if (usable == NULL) {
+    usable = um_newarena();
+  }
+
+  if (usable == NULL) {
+    return NULL;
+  }
+
+  uintptr_t current = usable->mem + usable->cursor;
+  usable->cursor += size;
+  usable->balance += 1;
+  return (void *)current;
+}
+
+void ufree(void *ptr_) {
+  uintptr_t ptr = (uintptr_t)ptr_;
+
+  UmArena *freeable = NULL;
+
+  UmArena *arena, *arenatmp;
+  LL_FOREACH_SAFE(ARENAS, arena, arenatmp) {
+    if (ptr >= arena->mem && ptr < arena->mem + ARENA_SIZE) {
+      freeable = arena;
+      break;
+    }
+  }
+
+  if (freeable == NULL) {
+    return;
+  }
+
+  freeable->balance -= 1;
+
+  if (freeable->balance <= 0) {
+    uintptr_t origin = (uintptr_t)freeable - sizeof(UmArena);
+    mman_unmap((void *)origin);
+  }
+}
+

ulib/umalloc/umalloc.h

@@ -0,0 +1,10 @@
+#ifndef ULIB_UMALLOC_UMALLOC_H_
+#define ULIB_UMALLOC_UMALLOC_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+void *umalloc(size_t size);
+void ufree(void *ptr_);
+
+#endif // ULIB_UMALLOC_UMALLOC_H_