X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a308bb217e5abbd93413e23cb59776c3f6d1d8db..f43bc484f697666583ba779d3adb325f1eee498b:/src/xbt/mmalloc/mm_legacy.c diff --git a/src/xbt/mmalloc/mm_legacy.c b/src/xbt/mmalloc/mm_legacy.c index 94aa3d1ac9..2c1a0d5d9d 100644 --- a/src/xbt/mmalloc/mm_legacy.c +++ b/src/xbt/mmalloc/mm_legacy.c @@ -5,13 +5,29 @@ * under the terms of the license (GNU LGPL) which comes with this package. */ /* Redefine the classical malloc/free/realloc functions so that they fit well in the mmalloc framework */ +#define _GNU_SOURCE +#include + +#include + +#include "../../mc/mc_base.h" #include "mmprivate.h" #include "xbt_modinter.h" #include "internal_config.h" #include +#include "../mc/mc_protocol.h" -//#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */ +/* ***** Whether to use `mmalloc` of the undrlying 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 @@ -19,194 +35,224 @@ 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 -#ifdef HAVE_GNU_LD - -#undef _GNU_SOURCE -#define _GNU_SOURCE 1 -#include -static void * (*real_malloc) (size_t) = NULL; -static void * (*real_realloc) (void*,size_t) = NULL; -static void * (*real_free) (void*) = NULL; +/* ***** Temporary allocator + * + * This is used before we have found the real malloc implementation with dlsym. + */ -static void mm_gnuld_legacy_init(void) { /* This function is called from mmalloc_preinit(); it works even if it's static because all mm is in mm.c */ - real_malloc = (void * (*) (size_t)) dlsym(RTLD_NEXT, "malloc"); - real_realloc = (void * (*) (void*,size_t)) dlsym(RTLD_NEXT, "realloc"); - real_free = (void * (*) (void*)) dlsym(RTLD_NEXT, "free"); - __mmalloc_current_heap = __mmalloc_default_mdp; -} +#define BUFFER_SIZE 32 +static size_t fake_alloc_index; +static uint64_t buffer[BUFFER_SIZE]; -/* Hello pimple! - * DL needs some memory while resolving the malloc symbol, that is somehow problematic - * To that extend, we have a little area here living in .BSS that we return if asked for memory before the malloc is resolved. +/* Fake implementations, they are used to fool dlsym: + * dlsym used calloc and falls back to some other mechanism + * if this fails. */ -static int allocated_junk = 0; /* keep track of many blocks of our little area was already given to someone */ -#define JUNK_SIZE 8 -#define MAX_JUNK_AREAS (3*4096/JUNK_SIZE) -static char junkareas[MAX_JUNK_AREAS][JUNK_SIZE]; - -/* This version use mmalloc if there is a current heap, or the legacy implem if not */ -static void *malloc_or_calloc(size_t n, int setzero) { - xbt_mheap_t mdp = __mmalloc_current_heap; - void *ret; -#ifdef MM_LEGACY_VERBOSE - static int warned_raw = 0; - static int warned_mmalloc = 0; -#endif - - if (mdp) { - LOCK(mdp); - ret = mmalloc(mdp, n); - UNLOCK(mdp); - // This was already done by mmalloc: - if (mdp->options & XBT_MHEAP_OPTION_MEMSET) { - setzero = 0; - } -#ifdef MM_LEGACY_VERBOSE - if (!warned_mmalloc) { - fprintf(stderr,"Using mmalloc; enabling the model-checker in cmake may have a bad impact on your simulation performance\n"); - warned_mmalloc = 1; - } -#endif - } else if (!real_malloc) { - size_t needed_areas = n / JUNK_SIZE; - if(needed_areas * JUNK_SIZE != n) needed_areas++; - if (allocated_junk+needed_areas>=MAX_JUNK_AREAS) { - fprintf(stderr, - "Panic: real malloc symbol not resolved yet, and I already gave my little private memory chunk away.\n"); - exit(1); - } else { - size_t i = allocated_junk; - allocated_junk += needed_areas; - ret = junkareas[i]; - } - } - else { -#ifdef MM_LEGACY_VERBOSE - if (!warned_raw) { - fprintf(stderr,"Using system malloc after interception; you seem to be currently model-checking\n"); - warned_raw = 1; - } -#endif - ret = real_malloc(n); - } - if (ret && setzero) { - memset(ret, 0, n); - } - return ret; +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 availabel 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; } -void *malloc(size_t n) +static void* mm_fake_calloc(size_t nmemb, size_t size) { - return malloc_or_calloc(n, 0); + // This is fresh .bss data, we don't need to clear it: + size_t n = nmemb * size; + return mm_fake_malloc(n); } -void *calloc(size_t nmemb, size_t size) +static void* mm_fake_realloc(void *p, size_t s) { - return malloc_or_calloc(nmemb*size, 1); + return mm_fake_malloc(s); } -void *realloc(void *p, size_t s) +static void mm_fake_free(void *p) { - xbt_mheap_t mdp = __mmalloc_current_heap; - void *ret; +} - if (mdp) { - LOCK(mdp); - ret = mrealloc(mdp, p, s); - UNLOCK(mdp); - } else { - ret = real_realloc(p,s); - } +/* Function signatures for the main malloc functions: */ +typedef void* (*mm_malloc_t)(size_t size); +typedef void (*mm_free_t)(void*); +typedef void* (*mm_calloc_t)(size_t nmemb, size_t size); +typedef void* (*mm_realloc_t)(void *ptr, size_t size); - return ret; -} +/* Function pointers to the real/next implementations: */ +static mm_malloc_t mm_real_malloc; +static mm_free_t mm_real_free; +static mm_calloc_t mm_real_calloc; +static mm_realloc_t mm_real_realloc; -void free(void *p) +static int mm_initializing; +static int mm_initialized; + +/** Constructor functions used to initialize the malloc implementation + */ +static void __attribute__((constructor(101))) mm_legacy_constructor() { - if (p==NULL) + if (mm_initialized) return; - if (p<=(void*)junkareas || p>(void*)(junkareas[MAX_JUNK_AREAS]) ) { - xbt_mheap_t mdp = __mmalloc_current_heap; - - if (mdp) { - LOCK(mdp); - mfree(mdp, p); - UNLOCK(mdp); - } else { - real_free(p); - } - } else if(allocated_junk && p==junkareas[allocated_junk-1]) { - allocated_junk--; + mm_initializing = 1; + __malloc_use_mmalloc = getenv(MC_ENV_VARIABLE) ? 1 : 0; + if (__malloc_use_mmalloc) { + __mmalloc_current_heap = mmalloc_preinit(); } else { - // Leaked memory. + 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"); } + mm_initializing = 0; + mm_initialized = 1; } +/* ***** 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 (!mm_initialized) { + if (mm_initializing) + return mm_fake_malloc(n); + mm_legacy_constructor(); + } + + 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; +} -#else /* NO GNU_LD */ void *malloc(size_t n) { - xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit(); + if (!mm_initialized) { + if (mm_initializing) + return mm_fake_malloc(n); + mm_legacy_constructor(); + } + + if (!__malloc_use_mmalloc) { + return mm_real_malloc(n); + } + + xbt_mheap_t mdp = GET_HEAP(); + if (!mdp) + return NULL; LOCK(mdp); void *ret = mmalloc(mdp, n); UNLOCK(mdp); - return ret; } void *calloc(size_t nmemb, size_t size) { - xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit(); + 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); + } + + xbt_mheap_t mdp = GET_HEAP(); + if (!mdp) + return NULL; LOCK(mdp); void *ret = mmalloc(mdp, nmemb*size); UNLOCK(mdp); - memset(ret, 0, nmemb * size); - - + // This was already done in the callee: + if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) { + memset(ret, 0, nmemb * size); + } return ret; } void *realloc(void *p, size_t s) { - void *ret = NULL; - xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit(); + 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); + } + + xbt_mheap_t mdp = GET_HEAP(); + if (!mdp) + return NULL; LOCK(mdp); - ret = mrealloc(mdp, p, s); + void* ret = mrealloc(mdp, p, s); UNLOCK(mdp); - return ret; } void free(void *p) { - if (p != NULL) { - xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit(); + if (!mm_initialized) { + if (mm_initializing) + return mm_fake_free(p); + mm_legacy_constructor(); + } - LOCK(mdp); - mfree(mdp, p); - UNLOCK(mdp); + if (!__malloc_use_mmalloc) { + mm_real_free(p); + return; } -} -#endif /* NO GNU_LD */ -#endif /* WANT_MALLOC_OVERRIDE */ + if (!p) + return; + xbt_mheap_t mdp = GET_HEAP(); + LOCK(mdp); + mfree(mdp, p); + UNLOCK(mdp); +} +#endif /* WANT_MALLOC_OVERRIDE */