-/* Copyright (c) 2010-2014. The SimGrid Team.
+/* Copyright (c) 2010-2018. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
#include <dlfcn.h>
#include "mmprivate.h"
-#include "xbt_modinter.h"
-#include "internal_config.h"
+#include "src/internal_config.h"
+#include "src/mc/mc_base.h"
+#include "src/mc/remote/mc_protocol.h"
+#include "src/xbt_modinter.h"
#include <math.h>
-//#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
+/* ***** Whether to use `mmalloc` of the underlying malloc ***** */
+
+static int __malloc_use_mmalloc;
+
+int malloc_use_mmalloc(void)
+{
+ return __malloc_use_mmalloc;
+}
+
+/* ***** Current heap ***** */
/* The mmalloc() package can use a single implicit malloc descriptor
for mmalloc/mrealloc/mfree operations which do not supply an explicit
backwards compatibility with the non-mmap'd version. */
xbt_mheap_t __mmalloc_default_mdp = NULL;
-
-static xbt_mheap_t __mmalloc_current_heap = NULL; /* The heap we are currently using. */
+/* The heap we are currently using. */
+static xbt_mheap_t __mmalloc_current_heap = NULL;
xbt_mheap_t mmalloc_get_current_heap(void)
{
return __mmalloc_current_heap;
}
-void mmalloc_set_current_heap(xbt_mheap_t new_heap)
+xbt_mheap_t mmalloc_set_current_heap(xbt_mheap_t new_heap)
{
+ xbt_mheap_t heap = __mmalloc_current_heap;
__mmalloc_current_heap = new_heap;
+ return heap;
}
-#ifdef MMALLOC_WANT_OVERRIDE_LEGACY
+/* Override the malloc-like functions if MC is activated at compile time */
+#if SIMGRID_HAVE_MC
+
+/* ***** Temporary allocator
+ *
+ * This is used before we have found the real malloc implementation with dlsym.
+ */
+
+#ifdef __FreeBSD__ /* FreeBSD require more memory, other might */
+# define BUFFER_SIZE 256
+#else /* Valid on: Linux */
+# define BUFFER_SIZE 32
+#endif
+static size_t fake_alloc_index;
+static uint64_t buffer[BUFFER_SIZE];
/* Fake implementations, they are used to fool dlsym:
* dlsym used calloc and falls back to some other mechanism
* if this fails.
*/
-static void* mm_fake_calloc(size_t nmemb, size_t size) { return NULL; }
-static void* mm_fake_malloc(size_t n) { return NULL; }
-static void* mm_fake_realloc(void *p, size_t s) { return NULL; }
+static void* mm_fake_malloc(size_t n)
+{
+ // How many uint64_t do w need?
+ size_t count = n / sizeof(uint64_t);
+ if (n % sizeof(uint64_t))
+ count++;
+ // Check that we have enough available memory:
+ if (fake_alloc_index + count >= BUFFER_SIZE)
+ exit(127);
+ // Allocate it:
+ uint64_t* res = buffer + fake_alloc_index;
+ fake_alloc_index += count;
+ return res;
+}
+
+static void* mm_fake_calloc(size_t nmemb, size_t size)
+{
+ // This is fresh .bss data, we don't need to clear it:
+ size_t n = nmemb * size;
+ return mm_fake_malloc(n);
+}
+
+static void* mm_fake_realloc(XBT_ATTRIB_UNUSED void* p, size_t s)
+{
+ return mm_fake_malloc(s);
+}
+
+static void mm_fake_free(XBT_ATTRIB_UNUSED void* p)
+{
+ // Nothing to do
+}
/* Function signatures for the main malloc functions: */
typedef void* (*mm_malloc_t)(size_t size);
typedef void* (*mm_realloc_t)(void *ptr, size_t size);
/* Function pointers to the real/next implementations: */
-static mm_malloc_t mm_real_malloc = mm_fake_malloc;
+static mm_malloc_t mm_real_malloc;
static mm_free_t mm_real_free;
-static mm_calloc_t mm_real_calloc = mm_fake_calloc;
-static mm_realloc_t mm_real_realloc = mm_fake_realloc;
-
-#define GET_HEAP() __mmalloc_current_heap
+static mm_calloc_t mm_real_calloc;
+static mm_realloc_t mm_real_realloc;
-static const char* env_name = "SIMGRID_MALLOC_USE_MM";
+static int mm_initializing;
+static int mm_initialized;
-int mmalloc_exec_using_mm(int argc, const char** argv)
+/** Constructor functions used to initialize the malloc implementation
+ */
+XBT_ATTRIB_CONSTRUCTOR(101) static void mm_legacy_constructor()
{
- char** argv2 = (char**) malloc(sizeof(char*) * (argc+1));
- memcpy(argv2, argv, sizeof(char*) * argc);
- argv2[argc] = NULL;
- if (setenv(env_name, "1", 1) >= 0) {
- execv(argv[0], argv2);
+ if (mm_initialized)
+ return;
+ mm_initializing = 1;
+ __malloc_use_mmalloc = getenv(MC_ENV_VARIABLE) ? 1 : 0;
+ if (__malloc_use_mmalloc) {
+ __mmalloc_current_heap = mmalloc_preinit();
+ } else {
+#if HAVE_DLFUNC
+ mm_real_realloc = (void *(*)(void *, size_t))dlfunc(RTLD_NEXT, "realloc");
+ mm_real_malloc = (void *(*)(size_t))dlfunc(RTLD_NEXT, "malloc");
+ mm_real_free = (void (*)(void *))dlfunc(RTLD_NEXT, "free");
+ mm_real_calloc = (void *(*)(size_t, size_t))dlfunc(RTLD_NEXT, "calloc");
+#else
+ mm_real_realloc = dlsym(RTLD_NEXT, "realloc");
+ mm_real_malloc = dlsym(RTLD_NEXT, "malloc");
+ mm_real_free = dlsym(RTLD_NEXT, "free");
+ mm_real_calloc = dlsym(RTLD_NEXT, "calloc");
+#endif
}
- unsetenv(env_name);
- fprintf(stderr, "Could not restart with mm malloc\n");
- free(argv2);
- return -1;
+ mm_initializing = 0;
+ mm_initialized = 1;
}
-void mmalloc_ensure_using_mm(int argc, const char** argv)
+/* ***** malloc/free implementation
+ *
+ * They call either the underlying/native/RTLD_NEXT implementation (non MC mode)
+ * or the mm implementation (MC mode).
+ *
+ * If we are initializing the malloc subsystem, we call the fake/dummy `malloc`
+ * implementation. This is necessary because `dlsym` calls `malloc` and friends.
+ */
+
+#define GET_HEAP() __mmalloc_current_heap
+
+void* malloc_no_memset(size_t n)
{
- if (!__mmalloc_default_mdp) {
- mmalloc_exec_using_mm(argc, argv);
+ if (!mm_initialized) {
+ if (mm_initializing)
+ return mm_fake_malloc(n);
+ mm_legacy_constructor();
}
-}
-/** Constructor functions used to initialize the malloc implementation
- */
-static void __attribute__((constructor(101))) mm_legacy_constructor()
-{
- bool use_mm = getenv(env_name);
- if (use_mm) {
- __mmalloc_current_heap = mmalloc_preinit();
- } else {
- mm_real_realloc = (mm_realloc_t) dlsym(RTLD_NEXT, "realloc");
- mm_real_malloc = (mm_malloc_t) dlsym(RTLD_NEXT, "malloc");
- mm_real_free = (mm_free_t) dlsym(RTLD_NEXT, "free");
- mm_real_calloc = (mm_calloc_t) dlsym(RTLD_NEXT, "calloc");
+ if (!__malloc_use_mmalloc) {
+ return mm_real_malloc(n);
}
+
+ xbt_mheap_t mdp = GET_HEAP();
+ if (!mdp)
+ return NULL;
+
+ LOCK(mdp);
+ void *ret = mmalloc_no_memset(mdp, n);
+ UNLOCK(mdp);
+ return ret;
}
void *malloc(size_t n)
{
- if (!__mmalloc_current_heap) {
+ if (!mm_initialized) {
+ if (mm_initializing)
+ return mm_fake_malloc(n);
+ mm_legacy_constructor();
+ }
+
+ if (!__malloc_use_mmalloc) {
return mm_real_malloc(n);
}
void *calloc(size_t nmemb, size_t size)
{
- if (!__mmalloc_current_heap) {
+ if (!mm_initialized) {
+ if (mm_initializing)
+ return mm_fake_calloc(nmemb, size);
+ mm_legacy_constructor();
+ }
+
+ if (!__malloc_use_mmalloc) {
return mm_real_calloc(nmemb, size);
}
void *realloc(void *p, size_t s)
{
- if (!__mmalloc_current_heap) {
+ if (!mm_initialized) {
+ if (mm_initializing)
+ return mm_fake_realloc(p, s);
+ mm_legacy_constructor();
+ }
+
+ if (!__malloc_use_mmalloc) {
return mm_real_realloc(p, s);
}
void free(void *p)
{
- if (!p)
- return;
+ if (!mm_initialized) {
+ if (mm_initializing)
+ return mm_fake_free(p);
+ mm_legacy_constructor();
+ }
- if (!__mmalloc_current_heap) {
+ if (!__malloc_use_mmalloc) {
mm_real_free(p);
return;
}
+ if (!p)
+ return;
+
xbt_mheap_t mdp = GET_HEAP();
LOCK(mdp);
mfree(mdp, p);
UNLOCK(mdp);
}
-#endif /* WANT_MALLOC_OVERRIDE */
+#endif /* SIMGRID_HAVE_MC */