diff options
Diffstat (limited to 'test/manual/etags/c-src/emacs/src/gmalloc.c')
| -rw-r--r-- | test/manual/etags/c-src/emacs/src/gmalloc.c | 2040 |
1 files changed, 2040 insertions, 0 deletions
diff --git a/test/manual/etags/c-src/emacs/src/gmalloc.c b/test/manual/etags/c-src/emacs/src/gmalloc.c new file mode 100644 index 00000000000..79b2040e321 --- /dev/null +++ b/test/manual/etags/c-src/emacs/src/gmalloc.c @@ -0,0 +1,2040 @@ +/* Declarations for `malloc' and friends. + Copyright (C) 1990-1993, 1995-1996, 1999, 2002-2007, 2013-2017 Free + Software Foundation, Inc. + Written May 1989 by Mike Haertel. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + +#include <config.h> + +#if defined HAVE_PTHREAD && !defined HYBRID_MALLOC +#define USE_PTHREAD +#endif + +#include <string.h> +#include <limits.h> +#include <stdint.h> + +#ifdef HYBRID_GET_CURRENT_DIR_NAME +#undef get_current_dir_name +#endif + +#include <unistd.h> + +#ifdef USE_PTHREAD +#include <pthread.h> +#endif + +#ifdef WINDOWSNT +#include <w32heap.h> /* for sbrk */ +#endif + +#ifdef emacs +extern void emacs_abort (void); +#endif + +/* If HYBRID_MALLOC is defined, then temacs will use malloc, + realloc... as defined in this file (and renamed gmalloc, + grealloc... via the macros that follow). The dumped emacs, + however, will use the system malloc, realloc.... In other source + files, malloc, realloc... are renamed hybrid_malloc, + hybrid_realloc... via macros in conf_post.h. hybrid_malloc and + friends are wrapper functions defined later in this file. + aligned_alloc is defined as a macro only in alloc.c. + + As of this writing (August 2014), Cygwin is the only platform on + which HYBRID_MACRO is defined. Any other platform that wants to + define it will have to define the macros DUMPED and + ALLOCATED_BEFORE_DUMPING, defined below for Cygwin. */ +#ifdef HYBRID_MALLOC +#undef malloc +#undef realloc +#undef calloc +#undef free +#define malloc gmalloc +#define realloc grealloc +#define calloc gcalloc +#define aligned_alloc galigned_alloc +#define free gfree +#endif /* HYBRID_MALLOC */ + +#ifdef CYGWIN +extern void *bss_sbrk (ptrdiff_t size); +extern int bss_sbrk_did_unexec; +extern char bss_sbrk_buffer[]; +extern void *bss_sbrk_buffer_end; +#define DUMPED bss_sbrk_did_unexec +#define ALLOCATED_BEFORE_DUMPING(P) \ + ((P) < bss_sbrk_buffer_end && (P) >= (void *) bss_sbrk_buffer) +#endif + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include <stddef.h> + + +/* Allocate SIZE bytes of memory. */ +extern void *malloc (size_t size) ATTRIBUTE_MALLOC_SIZE ((1)); +/* Re-allocate the previously allocated block + in ptr, making the new block SIZE bytes long. */ +extern void *realloc (void *ptr, size_t size) ATTRIBUTE_ALLOC_SIZE ((2)); +/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */ +extern void *calloc (size_t nmemb, size_t size) ATTRIBUTE_MALLOC_SIZE ((1,2)); +/* Free a block allocated by `malloc', `realloc' or `calloc'. */ +extern void free (void *ptr); + +/* Allocate SIZE bytes allocated to ALIGNMENT bytes. */ +#ifdef MSDOS +extern void *aligned_alloc (size_t, size_t); +extern void *memalign (size_t, size_t); +extern int posix_memalign (void **, size_t, size_t); +#endif + +#ifdef USE_PTHREAD +/* Set up mutexes and make malloc etc. thread-safe. */ +extern void malloc_enable_thread (void); +#endif + +#ifdef emacs +extern void emacs_abort (void); +#endif + +/* The allocator divides the heap into blocks of fixed size; large + requests receive one or more whole blocks, and small requests + receive a fragment of a block. Fragment sizes are powers of two, + and all fragments of a block are the same size. When all the + fragments in a block have been freed, the block itself is freed. */ +#define INT_BIT (CHAR_BIT * sizeof (int)) +#define BLOCKLOG (INT_BIT > 16 ? 12 : 9) +#define BLOCKSIZE (1 << BLOCKLOG) +#define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE) + +/* Determine the amount of memory spanned by the initial heap table + (not an absolute limit). */ +#define HEAP (INT_BIT > 16 ? 4194304 : 65536) + +/* Number of contiguous free blocks allowed to build up at the end of + memory before they will be returned to the system. */ +#define FINAL_FREE_BLOCKS 8 + +/* Data structure giving per-block information. */ +typedef union + { + /* Heap information for a busy block. */ + struct + { + /* Zero for a large (multiblock) object, or positive giving the + logarithm to the base two of the fragment size. */ + int type; + union + { + struct + { + size_t nfree; /* Free frags in a fragmented block. */ + size_t first; /* First free fragment of the block. */ + } frag; + /* For a large object, in its first block, this has the number + of blocks in the object. In the other blocks, this has a + negative number which says how far back the first block is. */ + ptrdiff_t size; + } info; + } busy; + /* Heap information for a free block + (that may be the first of a free cluster). */ + struct + { + size_t size; /* Size (in blocks) of a free cluster. */ + size_t next; /* Index of next free cluster. */ + size_t prev; /* Index of previous free cluster. */ + } free; + } malloc_info; + +/* Pointer to first block of the heap. */ +extern char *_heapbase; + +/* Table indexed by block number giving per-block information. */ +extern malloc_info *_heapinfo; + +/* Address to block number and vice versa. */ +#define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1) +#define ADDRESS(B) ((void *) (((B) - 1) * BLOCKSIZE + _heapbase)) + +/* Current search index for the heap table. */ +extern size_t _heapindex; + +/* Limit of valid info table indices. */ +extern size_t _heaplimit; + +/* Doubly linked lists of free fragments. */ +struct list + { + struct list *next; + struct list *prev; + }; + +/* Free list headers for each fragment size. */ +extern struct list _fraghead[]; + +/* List of blocks allocated with aligned_alloc and friends. */ +struct alignlist + { + struct alignlist *next; + void *aligned; /* The address that aligned_alloc returned. */ + void *exact; /* The address that malloc returned. */ + }; +extern struct alignlist *_aligned_blocks; + +/* Instrumentation. */ +extern size_t _chunks_used; +extern size_t _bytes_used; +extern size_t _chunks_free; +extern size_t _bytes_free; + +/* Internal versions of `malloc', `realloc', and `free' + used when these functions need to call each other. + They are the same but don't call the hooks. */ +extern void *_malloc_internal (size_t); +extern void *_realloc_internal (void *, size_t); +extern void _free_internal (void *); +extern void *_malloc_internal_nolock (size_t); +extern void *_realloc_internal_nolock (void *, size_t); +extern void _free_internal_nolock (void *); + +#ifdef USE_PTHREAD +extern pthread_mutex_t _malloc_mutex, _aligned_blocks_mutex; +extern int _malloc_thread_enabled_p; +#define LOCK() \ + do { \ + if (_malloc_thread_enabled_p) \ + pthread_mutex_lock (&_malloc_mutex); \ + } while (0) +#define UNLOCK() \ + do { \ + if (_malloc_thread_enabled_p) \ + pthread_mutex_unlock (&_malloc_mutex); \ + } while (0) +#define LOCK_ALIGNED_BLOCKS() \ + do { \ + if (_malloc_thread_enabled_p) \ + pthread_mutex_lock (&_aligned_blocks_mutex); \ + } while (0) +#define UNLOCK_ALIGNED_BLOCKS() \ + do { \ + if (_malloc_thread_enabled_p) \ + pthread_mutex_unlock (&_aligned_blocks_mutex); \ + } while (0) +#else +#define LOCK() +#define UNLOCK() +#define LOCK_ALIGNED_BLOCKS() +#define UNLOCK_ALIGNED_BLOCKS() +#endif + +/* Given an address in the middle of a malloc'd object, + return the address of the beginning of the object. */ +extern void *malloc_find_object_address (void *ptr); + +/* Underlying allocation function; successive calls should + return contiguous pieces of memory. */ +extern void *(*__morecore) (ptrdiff_t size); + +/* Default value of `__morecore'. */ +extern void *__default_morecore (ptrdiff_t size); + +/* If not NULL, this function is called after each time + `__morecore' is called to increase the data size. */ +extern void (*__after_morecore_hook) (void); + +/* Number of extra blocks to get each time we ask for more core. + This reduces the frequency of calling `(*__morecore)'. */ +extern size_t __malloc_extra_blocks; + +/* Nonzero if `malloc' has been called and done its initialization. */ +extern int __malloc_initialized; +/* Function called to initialize malloc data structures. */ +extern int __malloc_initialize (void); + +/* Hooks for debugging versions. */ +extern void (*__malloc_initialize_hook) (void); +extern void (*__free_hook) (void *ptr); +extern void *(*__malloc_hook) (size_t size); +extern void *(*__realloc_hook) (void *ptr, size_t size); +extern void *(*__memalign_hook) (size_t size, size_t alignment); + +/* Return values for `mprobe': these are the kinds of inconsistencies that + `mcheck' enables detection of. */ +enum mcheck_status + { + MCHECK_DISABLED = -1, /* Consistency checking is not turned on. */ + MCHECK_OK, /* Block is fine. */ + MCHECK_FREE, /* Block freed twice. */ + MCHECK_HEAD, /* Memory before the block was clobbered. */ + MCHECK_TAIL /* Memory after the block was clobbered. */ + }; + +/* Activate a standard collection of debugging hooks. This must be called + before `malloc' is ever called. ABORTFUNC is called with an error code + (see enum above) when an inconsistency is detected. If ABORTFUNC is + null, the standard function prints on stderr and then calls `abort'. */ +extern int mcheck (void (*abortfunc) (enum mcheck_status)); + +/* Check for aberrations in a particular malloc'd block. You must have + called `mcheck' already. These are the same checks that `mcheck' does + when you free or reallocate a block. */ +extern enum mcheck_status mprobe (void *ptr); + +/* Activate a standard collection of tracing hooks. */ +extern void mtrace (void); +extern void muntrace (void); + +/* Statistics available to the user. */ +struct mstats + { + size_t bytes_total; /* Total size of the heap. */ + size_t chunks_used; /* Chunks allocated by the user. */ + size_t bytes_used; /* Byte total of user-allocated chunks. */ + size_t chunks_free; /* Chunks in the free list. */ + size_t bytes_free; /* Byte total of chunks in the free list. */ + }; + +/* Pick up the current statistics. */ +extern struct mstats mstats (void); + +/* Call WARNFUN with a warning message when memory usage is high. */ +extern void memory_warnings (void *start, void (*warnfun) (const char *)); + +#ifdef __cplusplus +} +#endif + +/* Memory allocator `malloc'. + Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. + Written May 1989 by Mike Haertel. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + +#include <errno.h> + +void *(*__morecore) (ptrdiff_t size) = __default_morecore; + +/* Debugging hook for `malloc'. */ +void *(*__malloc_hook) (size_t size); + +/* Pointer to the base of the first block. */ +char *_heapbase; + +/* Block information table. Allocated with align/__free (not malloc/free). */ +malloc_info *_heapinfo; + +/* Number of info entries. */ +static size_t heapsize; + +/* Search index in the info table. */ +size_t _heapindex; + +/* Limit of valid info table indices. */ +size_t _heaplimit; + +/* Free lists for each fragment size. */ +struct list _fraghead[BLOCKLOG]; + +/* Instrumentation. */ +size_t _chunks_used; +size_t _bytes_used; +size_t _chunks_free; +size_t _bytes_free; + +/* Are you experienced? */ +int __malloc_initialized; + +size_t __malloc_extra_blocks; + +void (*__malloc_initialize_hook) (void); +void (*__after_morecore_hook) (void); + +#if defined GC_MALLOC_CHECK && defined GC_PROTECT_MALLOC_STATE + +/* Some code for hunting a bug writing into _heapinfo. + + Call this macro with argument PROT non-zero to protect internal + malloc state against writing to it, call it with a zero argument to + make it readable and writable. + + Note that this only works if BLOCKSIZE == page size, which is + the case on the i386. */ + +#include <sys/types.h> +#include <sys/mman.h> + +static int state_protected_p; +static size_t last_state_size; +static malloc_info *last_heapinfo; + +void +protect_malloc_state (int protect_p) +{ + /* If _heapinfo has been relocated, make sure its old location + isn't left read-only; it will be reused by malloc. */ + if (_heapinfo != last_heapinfo + && last_heapinfo + && state_protected_p) + mprotect (last_heapinfo, last_state_size, PROT_READ | PROT_WRITE); + + last_state_size = _heaplimit * sizeof *_heapinfo; + last_heapinfo = _heapinfo; + + if (protect_p != state_protected_p) + { + state_protected_p = protect_p; + if (mprotect (_heapinfo, last_state_size, + protect_p ? PROT_READ : PROT_READ | PROT_WRITE) != 0) + abort (); + } +} + +#define PROTECT_MALLOC_STATE(PROT) protect_malloc_state (PROT) + +#else +#define PROTECT_MALLOC_STATE(PROT) /* empty */ +#endif + + +/* Aligned allocation. */ +static void * +align (size_t size) +{ + void *result; + ptrdiff_t adj; + + /* align accepts an unsigned argument, but __morecore accepts a + signed one. This could lead to trouble if SIZE overflows the + ptrdiff_t type accepted by __morecore. We just punt in that + case, since they are requesting a ludicrous amount anyway. */ + if (PTRDIFF_MAX < size) + result = 0; + else + result = (*__morecore) (size); + adj = (uintptr_t) result % BLOCKSIZE; + if (adj != 0) + { + adj = BLOCKSIZE - adj; + (*__morecore) (adj); + result = (char *) result + adj; + } + + if (__after_morecore_hook) + (*__after_morecore_hook) (); + + return result; +} + +/* Get SIZE bytes, if we can get them starting at END. + Return the address of the space we got. + If we cannot get space at END, fail and return 0. */ +static void * +get_contiguous_space (ptrdiff_t size, void *position) +{ + void *before; + void *after; + + before = (*__morecore) (0); + /* If we can tell in advance that the break is at the wrong place, + fail now. */ + if (before != position) + return 0; + + /* Allocate SIZE bytes and get the address of them. */ + after = (*__morecore) (size); + if (!after) + return 0; + + /* It was not contiguous--reject it. */ + if (after != position) + { + (*__morecore) (- size); + return 0; + } + + return after; +} + + +/* This is called when `_heapinfo' and `heapsize' have just + been set to describe a new info table. Set up the table + to describe itself and account for it in the statistics. */ +static void +register_heapinfo (void) +{ + size_t block, blocks; + + block = BLOCK (_heapinfo); + blocks = BLOCKIFY (heapsize * sizeof (malloc_info)); + + /* Account for the _heapinfo block itself in the statistics. */ + _bytes_used += blocks * BLOCKSIZE; + ++_chunks_used; + + /* Describe the heapinfo block itself in the heapinfo. */ + _heapinfo[block].busy.type = 0; + _heapinfo[block].busy.info.size = blocks; + /* Leave back-pointers for malloc_find_address. */ + while (--blocks > 0) + _heapinfo[block + blocks].busy.info.size = -blocks; +} + +#ifdef USE_PTHREAD +pthread_mutex_t _malloc_mutex = PTHREAD_MUTEX_INITIALIZER; +pthread_mutex_t _aligned_blocks_mutex = PTHREAD_MUTEX_INITIALIZER; +int _malloc_thread_enabled_p; + +static void +malloc_atfork_handler_prepare (void) +{ + LOCK (); + LOCK_ALIGNED_BLOCKS (); +} + +static void +malloc_atfork_handler_parent (void) +{ + UNLOCK_ALIGNED_BLOCKS (); + UNLOCK (); +} + +static void +malloc_atfork_handler_child (void) +{ + UNLOCK_ALIGNED_BLOCKS (); + UNLOCK (); +} + +/* Set up mutexes and make malloc etc. thread-safe. */ +void +malloc_enable_thread (void) +{ + if (_malloc_thread_enabled_p) + return; + + /* Some pthread implementations call malloc for statically + initialized mutexes when they are used first. To avoid such a + situation, we initialize mutexes here while their use is + disabled in malloc etc. */ + pthread_mutex_init (&_malloc_mutex, NULL); + pthread_mutex_init (&_aligned_blocks_mutex, NULL); + pthread_atfork (malloc_atfork_handler_prepare, + malloc_atfork_handler_parent, + malloc_atfork_handler_child); + _malloc_thread_enabled_p = 1; +} +#endif /* USE_PTHREAD */ + +static void +malloc_initialize_1 (void) +{ +#ifdef GC_MCHECK + mcheck (NULL); +#endif + + if (__malloc_initialize_hook) + (*__malloc_initialize_hook) (); + + heapsize = HEAP / BLOCKSIZE; + _heapinfo = align (heapsize * sizeof (malloc_info)); + if (_heapinfo == NULL) + return; + memset (_heapinfo, 0, heapsize * sizeof (malloc_info)); + _heapinfo[0].free.size = 0; + _heapinfo[0].free.next = _heapinfo[0].free.prev = 0; + _heapindex = 0; + _heapbase = (char *) _heapinfo; + _heaplimit = BLOCK (_heapbase + heapsize * sizeof (malloc_info)); + + register_heapinfo (); + + __malloc_initialized = 1; + PROTECT_MALLOC_STATE (1); + return; +} + +/* Set everything up and remember that we have. + main will call malloc which calls this function. That is before any threads + or signal handlers has been set up, so we don't need thread protection. */ +int +__malloc_initialize (void) +{ + if (__malloc_initialized) + return 0; + + malloc_initialize_1 (); + + return __malloc_initialized; +} + +static int morecore_recursing; + +/* Get neatly aligned memory, initializing or + growing the heap info table as necessary. */ +static void * +morecore_nolock (size_t size) +{ + void *result; + malloc_info *newinfo, *oldinfo; + size_t newsize; + + if (morecore_recursing) + /* Avoid recursion. The caller will know how to handle a null return. */ + return NULL; + + result = align (size); + if (result == NULL) + return NULL; + + PROTECT_MALLOC_STATE (0); + + /* Check if we need to grow the info table. */ + if ((size_t) BLOCK ((char *) result + size) > heapsize) + { + /* Calculate the new _heapinfo table size. We do not account for the + added blocks in the table itself, as we hope to place them in + existing free space, which is already covered by part of the + existing table. */ + newsize = heapsize; + do + newsize *= 2; + while ((size_t) BLOCK ((char *) result + size) > newsize); + + /* We must not reuse existing core for the new info table when called + from realloc in the case of growing a large block, because the + block being grown is momentarily marked as free. In this case + _heaplimit is zero so we know not to reuse space for internal + allocation. */ + if (_heaplimit != 0) + { + /* First try to allocate the new info table in core we already + have, in the usual way using realloc. If realloc cannot + extend it in place or relocate it to existing sufficient core, + we will get called again, and the code above will notice the + `morecore_recursing' flag and return null. */ + int save = errno; /* Don't want to clobber errno with ENOMEM. */ + morecore_recursing = 1; + newinfo = _realloc_internal_nolock (_heapinfo, + newsize * sizeof (malloc_info)); + morecore_recursing = 0; + if (newinfo == NULL) + errno = save; + else + { + /* We found some space in core, and realloc has put the old + table's blocks on the free list. Now zero the new part + of the table and install the new table location. */ + memset (&newinfo[heapsize], 0, + (newsize - heapsize) * sizeof (malloc_info)); + _heapinfo = newinfo; + heapsize = newsize; + goto got_heap; + } + } + + /* Allocate new space for the malloc info table. */ + while (1) + { + newinfo = align (newsize * sizeof (malloc_info)); + + /* Did it fail? */ + if (newinfo == NULL) + { + (*__morecore) (-size); + return NULL; + } + + /* Is it big enough to record status for its own space? + If so, we win. */ + if ((size_t) BLOCK ((char *) newinfo + + newsize * sizeof (malloc_info)) + < newsize) + break; + + /* Must try again. First give back most of what we just got. */ + (*__morecore) (- newsize * sizeof (malloc_info)); + newsize *= 2; + } + + /* Copy the old table to the beginning of the new, + and zero the rest of the new table. */ + memcpy (newinfo, _heapinfo, heapsize * sizeof (malloc_info)); + memset (&newinfo[heapsize], 0, + (newsize - heapsize) * sizeof (malloc_info)); + oldinfo = _heapinfo; + _heapinfo = newinfo; + heapsize = newsize; + + register_heapinfo (); + + /* Reset _heaplimit so _free_internal never decides + it can relocate or resize the info table. */ + _heaplimit = 0; + _free_internal_nolock (oldinfo); + PROTECT_MALLOC_STATE (0); + + /* The new heap limit includes the new table just allocated. */ + _heaplimit = BLOCK ((char *) newinfo + heapsize * sizeof (malloc_info)); + return result; + } + + got_heap: + _heaplimit = BLOCK ((char *) result + size); + return result; +} + +/* Allocate memory from the heap. */ +void * +_malloc_internal_nolock (size_t size) +{ + void *result; + size_t block, blocks, lastblocks, start; + register size_t i; + struct list *next; + + /* ANSI C allows `malloc (0)' to either return NULL, or to return a + valid address you can realloc and free (though not dereference). + + It turns out that some extant code (sunrpc, at least Ultrix's version) + expects `malloc (0)' to return non-NULL and breaks otherwise. + Be compatible. */ + +#if 0 + if (size == 0) + return NULL; +#endif + + PROTECT_MALLOC_STATE (0); + + if (size < sizeof (struct list)) + size = sizeof (struct list); + + /* Determine the allocation policy based on the request size. */ + if (size <= BLOCKSIZE / 2) + { + /* Small allocation to receive a fragment of a block. + Determine the logarithm to base two of the fragment size. */ + register size_t log = 1; + --size; + while ((size /= 2) != 0) + ++log; + + /* Look in the fragment lists for a + free fragment of the desired size. */ + next = _fraghead[log].next; + if (next != NULL) + { + /* There are free fragments of this size. + Pop a fragment out of the fragment list and return it. + Update the block's nfree and first counters. */ + result = next; + next->prev->next = next->next; + if (next->next != NULL) + next->next->prev = next->prev; + block = BLOCK (result); + if (--_heapinfo[block].busy.info.frag.nfree != 0) + _heapinfo[block].busy.info.frag.first = + (uintptr_t) next->next % BLOCKSIZE >> log; + + /* Update the statistics. */ + ++_chunks_used; + _bytes_used += 1 << log; + --_chunks_free; + _bytes_free -= 1 << log; + } + else + { + /* No free fragments of the desired size, so get a new block + and break it into fragments, returning the first. */ +#ifdef GC_MALLOC_CHECK + result = _malloc_internal_nolock (BLOCKSIZE); + PROTECT_MALLOC_STATE (0); +#elif defined (USE_PTHREAD) + result = _malloc_internal_nolock (BLOCKSIZE); +#else + result = malloc (BLOCKSIZE); +#endif + if (result == NULL) + { + PROTECT_MALLOC_STATE (1); + goto out; + } + + /* Link all fragments but the first into the free list. */ + next = (struct list *) ((char *) result + (1 << log)); + next->next = NULL; + next->prev = &_fraghead[log]; + _fraghead[log].next = next; + + for (i = 2; i < (size_t) (BLOCKSIZE >> log); ++i) + { + next = (struct list *) ((char *) result + (i << log)); + next->next = _fraghead[log].next; + next->prev = &_fraghead[log]; + next->prev->next = next; + next->next->prev = next; + } + + /* Initialize the nfree and first counters for this block. */ + block = BLOCK (result); + _heapinfo[block].busy.type = log; + _heapinfo[block].busy.info.frag.nfree = i - 1; + _heapinfo[block].busy.info.frag.first = i - 1; + + _chunks_free += (BLOCKSIZE >> log) - 1; + _bytes_free += BLOCKSIZE - (1 << log); + _bytes_used -= BLOCKSIZE - (1 << log); + } + } + else + { + /* Large allocation to receive one or more blocks. + Search the free list in a circle starting at the last place visited. + If we loop completely around without finding a large enough + space we will have to get more memory from the system. */ + blocks = BLOCKIFY (size); + start = block = _heapindex; + while (_heapinfo[block].free.size < blocks) + { + block = _heapinfo[block].free.next; + if (block == start) + { + /* Need to get more from the system. Get a little extra. */ + size_t wantblocks = blocks + __malloc_extra_blocks; + block = _heapinfo[0].free.prev; + lastblocks = _heapinfo[block].free.size; + /* Check to see if the new core will be contiguous with the + final free block; if so we don't need to get as much. */ + if (_heaplimit != 0 && block + lastblocks == _heaplimit && + /* We can't do this if we will have to make the heap info + table bigger to accommodate the new space. */ + block + wantblocks <= heapsize && + get_contiguous_space ((wantblocks - lastblocks) * BLOCKSIZE, + ADDRESS (block + lastblocks))) + { + /* We got it contiguously. Which block we are extending + (the `final free block' referred to above) might have + changed, if it got combined with a freed info table. */ + block = _heapinfo[0].free.prev; + _heapinfo[block].free.size += (wantblocks - lastblocks); + _bytes_free += (wantblocks - lastblocks) * BLOCKSIZE; + _heaplimit += wantblocks - lastblocks; + continue; + } + result = morecore_nolock (wantblocks * BLOCKSIZE); + if (result == NULL) + goto out; + block = BLOCK (result); + /* Put the new block at the end of the free list. */ + _heapinfo[block].free.size = wantblocks; + _heapinfo[block].free.prev = _heapinfo[0].free.prev; + _heapinfo[block].free.next = 0; + _heapinfo[0].free.prev = block; + _heapinfo[_heapinfo[block].free.prev].free.next = block; + ++_chunks_free; + /* Now loop to use some of that block for this allocation. */ + } + } + + /* At this point we have found a suitable free list entry. + Figure out how to remove what we need from the list. */ + result = ADDRESS (block); + if (_heapinfo[block].free.size > blocks) + { + /* The block we found has a bit left over, + so relink the tail end back into the free list. */ + _heapinfo[block + blocks].free.size + = _heapinfo[block].free.size - blocks; + _heapinfo[block + blocks].free.next + = _heapinfo[block].free.next; + _heapinfo[block + blocks].free.prev + = _heapinfo[block].free.prev; + _heapinfo[_heapinfo[block].free.prev].free.next + = _heapinfo[_heapinfo[block].free.next].free.prev + = _heapindex = block + blocks; + } + else + { + /* The block exactly matches our requirements, + so just remove it from the list. */ + _heapinfo[_heapinfo[block].free.next].free.prev + = _heapinfo[block].free.prev; + _heapinfo[_heapinfo[block].free.prev].free.next + = _heapindex = _heapinfo[block].free.next; + --_chunks_free; + } + + _heapinfo[block].busy.type = 0; + _heapinfo[block].busy.info.size = blocks; + ++_chunks_used; + _bytes_used += blocks * BLOCKSIZE; + _bytes_free -= blocks * BLOCKSIZE; + + /* Mark all the blocks of the object just allocated except for the + first with a negative number so you can find the first block by + adding that adjustment. */ + while (--blocks > 0) + _heapinfo[block + blocks].busy.info.size = -blocks; + } + + PROTECT_MALLOC_STATE (1); + out: + return result; +} + +void * +_malloc_internal (size_t size) +{ + void *result; + + LOCK (); + result = _malloc_internal_nolock (size); + UNLOCK (); + + return result; +} + +void * +malloc (size_t size) +{ + void *(*hook) (size_t); + + if (!__malloc_initialized && !__malloc_initialize ()) + return NULL; + + /* Copy the value of __malloc_hook to an automatic variable in case + __malloc_hook is modified in another thread between its + NULL-check and the use. + + Note: Strictly speaking, this is not a right solution. We should + use mutexes to access non-read-only variables that are shared + among multiple threads. We just leave it for compatibility with + glibc malloc (i.e., assignments to __malloc_hook) for now. */ + hook = __malloc_hook; + return (hook != NULL ? *hook : _malloc_internal) (size); +} + +#ifndef _LIBC + +/* On some ANSI C systems, some libc functions call _malloc, _free + and _realloc. Make them use the GNU functions. */ + +extern void *_malloc (size_t); +extern void _free (void *); +extern void *_realloc (void *, size_t); + +void * +_malloc (size_t size) +{ + return malloc (size); +} + +void +_free (void *ptr) +{ + free (ptr); +} + +void * +_realloc (void *ptr, size_t size) +{ + return realloc (ptr, size); +} + +#endif +/* Free a block of memory allocated by `malloc'. + Copyright 1990, 1991, 1992, 1994, 1995 Free Software Foundation, Inc. + Written May 1989 by Mike Haertel. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + + +/* Debugging hook for free. */ +void (*__free_hook) (void *__ptr); + +/* List of blocks allocated by aligned_alloc. */ +struct alignlist *_aligned_blocks = NULL; + +/* Return memory to the heap. + Like `_free_internal' but don't lock mutex. */ +void +_free_internal_nolock (void *ptr) +{ + int type; + size_t block, blocks; + register size_t i; + struct list *prev, *next; + void *curbrk; + const size_t lesscore_threshold + /* Threshold of free space at which we will return some to the system. */ + = FINAL_FREE_BLOCKS + 2 * __malloc_extra_blocks; + + register struct alignlist *l; + + if (ptr == NULL) + return; + + PROTECT_MALLOC_STATE (0); + + LOCK_ALIGNED_BLOCKS (); + for (l = _aligned_blocks; l != NULL; l = l->next) + if (l->aligned == ptr) + { + l->aligned = NULL; /* Mark the slot in the list as free. */ + ptr = l->exact; + break; + } + UNLOCK_ALIGNED_BLOCKS (); + + block = BLOCK (ptr); + + type = _heapinfo[block].busy.type; + switch (type) + { + case 0: + /* Get as many statistics as early as we can. */ + --_chunks_used; + _bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE; + _bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE; + + /* Find the free cluster previous to this one in the free list. + Start searching at the last block referenced; this may benefit + programs with locality of allocation. */ + i = _heapindex; + if (i > block) + while (i > block) + i = _heapinfo[i].free.prev; + else + { + do + i = _heapinfo[i].free.next; + while (i > 0 && i < block); + i = _heapinfo[i].free.prev; + } + + /* Determine how to link this block into the free list. */ + if (block == i + _heapinfo[i].free.size) + { + /* Coalesce this block with its predecessor. */ + _heapinfo[i].free.size += _heapinfo[block].busy.info.size; + block = i; + } + else + { + /* Really link this block back into the free list. */ + _heapinfo[block].free.size = _heapinfo[block].busy.info.size; + _heapinfo[block].free.next = _heapinfo[i].free.next; + _heapinfo[block].free.prev = i; + _heapinfo[i].free.next = block; + _heapinfo[_heapinfo[block].free.next].free.prev = block; + ++_chunks_free; + } + + /* Now that the block is linked in, see if we can coalesce it + with its successor (by deleting its successor from the list + and adding in its size). */ + if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) + { + _heapinfo[block].free.size + += _heapinfo[_heapinfo[block].free.next].free.size; + _heapinfo[block].free.next + = _heapinfo[_heapinfo[block].free.next].free.next; + _heapinfo[_heapinfo[block].free.next].free.prev = block; + --_chunks_free; + } + + /* How many trailing free blocks are there now? */ + blocks = _heapinfo[block].free.size; + + /* Where is the current end of accessible core? */ + curbrk = (*__morecore) (0); + + if (_heaplimit != 0 && curbrk == ADDRESS (_heaplimit)) + { + /* The end of the malloc heap is at the end of accessible core. + It's possible that moving _heapinfo will allow us to + return some space to the system. */ + + size_t info_block = BLOCK (_heapinfo); + size_t info_blocks = _heapinfo[info_block].busy.info.size; + size_t prev_block = _heapinfo[block].free.prev; + size_t prev_blocks = _heapinfo[prev_block].free.size; + size_t next_block = _heapinfo[block].free.next; + size_t next_blocks = _heapinfo[next_block].free.size; + + if (/* Win if this block being freed is last in core, the info table + is just before it, the previous free block is just before the + info table, and the two free blocks together form a useful + amount to return to the system. */ + (block + blocks == _heaplimit && + info_block + info_blocks == block && + prev_block != 0 && prev_block + prev_blocks == info_block && + blocks + prev_blocks >= lesscore_threshold) || + /* Nope, not the case. We can also win if this block being + freed is just before the info table, and the table extends + to the end of core or is followed only by a free block, + and the total free space is worth returning to the system. */ + (block + blocks == info_block && + ((info_block + info_blocks == _heaplimit && + blocks >= lesscore_threshold) || + (info_block + info_blocks == next_block && + next_block + next_blocks == _heaplimit && + blocks + next_blocks >= lesscore_threshold))) + ) + { + malloc_info *newinfo; + size_t oldlimit = _heaplimit; + + /* Free the old info table, clearing _heaplimit to avoid + recursion into this code. We don't want to return the + table's blocks to the system before we have copied them to + the new location. */ + _heaplimit = 0; + _free_internal_nolock (_heapinfo); + _heaplimit = oldlimit; + + /* Tell malloc to search from the beginning of the heap for + free blocks, so it doesn't reuse the ones just freed. */ + _heapindex = 0; + + /* Allocate new space for the info table and move its data. */ + newinfo = _malloc_internal_nolock (info_blocks * BLOCKSIZE); + PROTECT_MALLOC_STATE (0); + memmove (newinfo, _heapinfo, info_blocks * BLOCKSIZE); + _heapinfo = newinfo; + + /* We should now have coalesced the free block with the + blocks freed from the old info table. Examine the entire + trailing free block to decide below whether to return some + to the system. */ + block = _heapinfo[0].free.prev; + blocks = _heapinfo[block].free.size; + } + + /* Now see if we can return stuff to the system. */ + if (block + blocks == _heaplimit && blocks >= lesscore_threshold) + { + register size_t bytes = blocks * BLOCKSIZE; + _heaplimit -= blocks; + (*__morecore) (-bytes); + _heapinfo[_heapinfo[block].free.prev].free.next + = _heapinfo[block].free.next; + _heapinfo[_heapinfo[block].free.next].free.prev + = _heapinfo[block].free.prev; + block = _heapinfo[block].free.prev; + --_chunks_free; + _bytes_free -= bytes; + } + } + + /* Set the next search to begin at this block. */ + _heapindex = block; + break; + + default: + /* Do some of the statistics. */ + --_chunks_used; + _bytes_used -= 1 << type; + ++_chunks_free; + _bytes_free += 1 << type; + + /* Get the address of the first free fragment in this block. */ + prev = (struct list *) ((char *) ADDRESS (block) + + (_heapinfo[block].busy.info.frag.first << type)); + + if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1) + { + /* If all fragments of this block are free, remove them + from the fragment list and free the whole block. */ + next = prev; + for (i = 1; i < (size_t) (BLOCKSIZE >> type); ++i) + next = next->next; + prev->prev->next = next; + if (next != NULL) + next->prev = prev->prev; + _heapinfo[block].busy.type = 0; + _heapinfo[block].busy.info.size = 1; + + /* Keep the statistics accurate. */ + ++_chunks_used; + _bytes_used += BLOCKSIZE; + _chunks_free -= BLOCKSIZE >> type; + _bytes_free -= BLOCKSIZE; + +#if defined (GC_MALLOC_CHECK) || defined (USE_PTHREAD) + _free_internal_nolock (ADDRESS (block)); +#else + free (ADDRESS (block)); +#endif + } + else if (_heapinfo[block].busy.info.frag.nfree != 0) + { + /* If some fragments of this block are free, link this + fragment into the fragment list after the first free + fragment of this block. */ + next = ptr; + next->next = prev->next; + next->prev = prev; + prev->next = next; + if (next->next != NULL) + next->next->prev = next; + ++_heapinfo[block].busy.info.frag.nfree; + } + else + { + /* No fragments of this block are free, so link this + fragment into the fragment list and announce that + it is the first free fragment of this block. */ + prev = ptr; + _heapinfo[block].busy.info.frag.nfree = 1; + _heapinfo[block].busy.info.frag.first = + (uintptr_t) ptr % BLOCKSIZE >> type; + prev->next = _fraghead[type].next; + prev->prev = &_fraghead[type]; + prev->prev->next = prev; + if (prev->next != NULL) + prev->next->prev = prev; + } + break; + } + + PROTECT_MALLOC_STATE (1); +} + +/* Return memory to the heap. + Like `free' but don't call a __free_hook if there is one. */ +void +_free_internal (void *ptr) +{ + LOCK (); + _free_internal_nolock (ptr); + UNLOCK (); +} + +/* Return memory to the heap. */ + +void +free (void *ptr) +{ + void (*hook) (void *) = __free_hook; + + if (hook != NULL) + (*hook) (ptr); + else + _free_internal (ptr); +} + +/* Define the `cfree' alias for `free'. */ +#ifdef weak_alias +weak_alias (free, cfree) +#else +void +cfree (void *ptr) +{ + free (ptr); +} +#endif +/* Change the size of a block allocated by `malloc'. + Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. + Written May 1989 by Mike Haertel. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + +#ifndef min +#define min(a, b) ((a) < (b) ? (a) : (b)) +#endif + +/* Debugging hook for realloc. */ +void *(*__realloc_hook) (void *ptr, size_t size); + +/* Resize the given region to the new size, returning a pointer + to the (possibly moved) region. This is optimized for speed; + some benchmarks seem to indicate that greater compactness is + achieved by unconditionally allocating and copying to a + new region. This module has incestuous knowledge of the + internals of both free and malloc. */ +void * +_realloc_internal_nolock (void *ptr, size_t size) +{ + void *result; + int type; + size_t block, blocks, oldlimit; + + if (size == 0) + { + _free_internal_nolock (ptr); + return _malloc_internal_nolock (0); + } + else if (ptr == NULL) + return _malloc_internal_nolock (size); + + block = BLOCK (ptr); + + PROTECT_MALLOC_STATE (0); + + type = _heapinfo[block].busy.type; + switch (type) + { + case 0: + /* Maybe reallocate a large block to a small fragment. */ + if (size <= BLOCKSIZE / 2) + { + result = _malloc_internal_nolock (size); + if (result != NULL) + { + memcpy (result, ptr, size); + _free_internal_nolock (ptr); + goto out; + } + } + + /* The new size is a large allocation as well; + see if we can hold it in place. */ + blocks = BLOCKIFY (size); + if (blocks < _heapinfo[block].busy.info.size) + { + /* The new size is smaller; return + excess memory to the free list. */ + _heapinfo[block + blocks].busy.type = 0; + _heapinfo[block + blocks].busy.info.size + = _heapinfo[block].busy.info.size - blocks; + _heapinfo[block].busy.info.size = blocks; + /* We have just created a new chunk by splitting a chunk in two. + Now we will free this chunk; increment the statistics counter + so it doesn't become wrong when _free_internal decrements it. */ + ++_chunks_used; + _free_internal_nolock (ADDRESS (block + blocks)); + result = ptr; + } + else if (blocks == _heapinfo[block].busy.info.size) + /* No size change necessary. */ + result = ptr; + else + { + /* Won't fit, so allocate a new region that will. + Free the old region first in case there is sufficient + adjacent free space to grow without moving. */ + blocks = _heapinfo[block].busy.info.size; + /* Prevent free from actually returning memory to the system. */ + oldlimit = _heaplimit; + _heaplimit = 0; + _free_internal_nolock (ptr); + result = _malloc_internal_nolock (size); + PROTECT_MALLOC_STATE (0); + if (_heaplimit == 0) + _heaplimit = oldlimit; + if (result == NULL) + { + /* Now we're really in trouble. We have to unfree + the thing we just freed. Unfortunately it might + have been coalesced with its neighbors. */ + if (_heapindex == block) + (void) _malloc_internal_nolock (blocks * BLOCKSIZE); + else + { + void *previous + = _malloc_internal_nolock ((block - _heapindex) * BLOCKSIZE); + (void) _malloc_internal_nolock (blocks * BLOCKSIZE); + _free_internal_nolock (previous); + } + goto out; + } + if (ptr != result) + memmove (result, ptr, blocks * BLOCKSIZE); + } + break; + + default: + /* Old size is a fragment; type is logarithm + to base two of the fragment size. */ + if (size > (size_t) (1 << (type - 1)) && + size <= (size_t) (1 << type)) + /* The new size is the same kind of fragment. */ + result = ptr; + else + { + /* The new size is different; allocate a new space, + and copy the lesser of the new size and the old. */ + result = _malloc_internal_nolock (size); + if (result == NULL) + goto out; + memcpy (result, ptr, min (size, (size_t) 1 << type)); + _free_internal_nolock (ptr); + } + break; + } + + PROTECT_MALLOC_STATE (1); + out: + return result; +} + +void * +_realloc_internal (void *ptr, size_t size) +{ + void *result; + + LOCK (); + result = _realloc_internal_nolock (ptr, size); + UNLOCK (); + + return result; +} + +void * +realloc (void *ptr, size_t size) +{ + void *(*hook) (void *, size_t); + + if (!__malloc_initialized && !__malloc_initialize ()) + return NULL; + + hook = __realloc_hook; + return (hook != NULL ? *hook : _realloc_internal) (ptr, size); +} +/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + +/* Allocate an array of NMEMB elements each SIZE bytes long. + The entire array is initialized to zeros. */ +void * +calloc (size_t nmemb, size_t size) +{ + void *result; + size_t bytes = nmemb * size; + + if (size != 0 && bytes / size != nmemb) + { + errno = ENOMEM; + return NULL; + } + + result = malloc (bytes); + if (result) + return memset (result, 0, bytes); + return result; +} +/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ + +/* uClibc defines __GNU_LIBRARY__, but it is not completely + compatible. */ +#if !defined (__GNU_LIBRARY__) || defined (__UCLIBC__) +#define __sbrk sbrk +#else /* __GNU_LIBRARY__ && ! defined (__UCLIBC__) */ +/* It is best not to declare this and cast its result on foreign operating + systems with potentially hostile include files. */ + +extern void *__sbrk (ptrdiff_t increment); +#endif /* __GNU_LIBRARY__ && ! defined (__UCLIBC__) */ + +/* Allocate INCREMENT more bytes of data space, + and return the start of data space, or NULL on errors. + If INCREMENT is negative, shrink data space. */ +void * +__default_morecore (ptrdiff_t increment) +{ + void *result; +#if defined (CYGWIN) + if (!DUMPED) + { + return bss_sbrk (increment); + } +#endif + result = (void *) __sbrk (increment); + if (result == (void *) -1) + return NULL; + return result; +} +/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. */ + +void *(*__memalign_hook) (size_t size, size_t alignment); + +void * +aligned_alloc (size_t alignment, size_t size) +{ + void *result; + size_t adj, lastadj; + void *(*hook) (size_t, size_t) = __memalign_hook; + + if (hook) + return (*hook) (alignment, size); + + /* Allocate a block with enough extra space to pad the block with up to + (ALIGNMENT - 1) bytes if necessary. */ + if (- size < alignment) + { + errno = ENOMEM; + return NULL; + } + result = malloc (size + alignment - 1); + if (result == NULL) + return NULL; + + /* Figure out how much we will need to pad this particular block + to achieve the required alignment. */ + adj = alignment - (uintptr_t) result % alignment; + if (adj == alignment) + adj = 0; + + if (adj != alignment - 1) + { + do + { + /* Reallocate the block with only as much excess as it + needs. */ + free (result); + result = malloc (size + adj); + if (result == NULL) /* Impossible unless interrupted. */ + return NULL; + + lastadj = adj; + adj = alignment - (uintptr_t) result % alignment; + if (adj == alignment) + adj = 0; + /* It's conceivable we might have been so unlucky as to get + a different block with weaker alignment. If so, this + block is too short to contain SIZE after alignment + correction. So we must try again and get another block, + slightly larger. */ + } while (adj > lastadj); + } + + if (adj != 0) + { + /* Record this block in the list of aligned blocks, so that `free' + can identify the pointer it is passed, which will be in the middle + of an allocated block. */ + + struct alignlist *l; + LOCK_ALIGNED_BLOCKS (); + for (l = _aligned_blocks; l != NULL; l = l->next) + if (l->aligned == NULL) + /* This slot is free. Use it. */ + break; + if (l == NULL) + { + l = malloc (sizeof *l); + if (l != NULL) + { + l->next = _aligned_blocks; + _aligned_blocks = l; + } + } + if (l != NULL) + { + l->exact = result; + result = l->aligned = (char *) result + adj; + } + UNLOCK_ALIGNED_BLOCKS (); + if (l == NULL) + { + free (result); + result = NULL; + } + } + + return result; +} + +/* An obsolete alias for aligned_alloc, for any old libraries that use + this alias. */ + +void * +memalign (size_t alignment, size_t size) +{ + return aligned_alloc (alignment, size); +} + +/* If HYBRID_MALLOC is defined, we may want to use the system + posix_memalign below. */ +#ifndef HYBRID_MALLOC +int +posix_memalign (void **memptr, size_t alignment, size_t size) +{ + void *mem; + + if (alignment == 0 + || alignment % sizeof (void *) != 0 + || (alignment & (alignment - 1)) != 0) + return EINVAL; + + mem = aligned_alloc (alignment, size); + if (mem == NULL) + return ENOMEM; + + *memptr = mem; + + return 0; +} +#endif + +/* Allocate memory on a page boundary. + Copyright (C) 1991, 92, 93, 94, 96 Free Software Foundation, Inc. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + +/* Allocate SIZE bytes on a page boundary. */ +extern void *valloc (size_t); + +#if defined _SC_PAGESIZE || !defined HAVE_GETPAGESIZE +# include "getpagesize.h" +#elif !defined getpagesize +extern int getpagesize (void); +#endif + +static size_t pagesize; + +void * +valloc (size_t size) +{ + if (pagesize == 0) + pagesize = getpagesize (); + + return aligned_alloc (pagesize, size); +} + +#ifdef HYBRID_MALLOC +#undef malloc +#undef realloc +#undef calloc +#undef aligned_alloc +#undef free + +/* Declare system malloc and friends. */ +extern void *malloc (size_t size); +extern void *realloc (void *ptr, size_t size); +extern void *calloc (size_t nmemb, size_t size); +extern void free (void *ptr); +#ifdef HAVE_ALIGNED_ALLOC +extern void *aligned_alloc (size_t alignment, size_t size); +#elif defined HAVE_POSIX_MEMALIGN +extern int posix_memalign (void **memptr, size_t alignment, size_t size); +#endif + +/* See the comments near the beginning of this file for explanations + of the following functions. */ + +void * +hybrid_malloc (size_t size) +{ + if (DUMPED) + return malloc (size); + return gmalloc (size); +} + +void * +hybrid_calloc (size_t nmemb, size_t size) +{ + if (DUMPED) + return calloc (nmemb, size); + return gcalloc (nmemb, size); +} + +void +hybrid_free (void *ptr) +{ + if (!DUMPED) + gfree (ptr); + else if (!ALLOCATED_BEFORE_DUMPING (ptr)) + free (ptr); + /* Otherwise the dumped emacs is trying to free something allocated + before dumping; do nothing. */ + return; +} + +#if defined HAVE_ALIGNED_ALLOC || defined HAVE_POSIX_MEMALIGN +void * +hybrid_aligned_alloc (size_t alignment, size_t size) +{ + if (!DUMPED) + return galigned_alloc (alignment, size); + /* The following is copied from alloc.c */ +#ifdef HAVE_ALIGNED_ALLOC + return aligned_alloc (alignment, size); +#else /* HAVE_POSIX_MEMALIGN */ + void *p; + return posix_memalign (&p, alignment, size) == 0 ? p : 0; +#endif +} +#endif + +void * +hybrid_realloc (void *ptr, size_t size) +{ + void *result; + int type; + size_t block, oldsize; + + if (!DUMPED) + return grealloc (ptr, size); + if (!ALLOCATED_BEFORE_DUMPING (ptr)) + return realloc (ptr, size); + + /* The dumped emacs is trying to realloc storage allocated before + dumping. We just malloc new space and copy the data. */ + if (size == 0 || ptr == NULL) + return malloc (size); + block = ((char *) ptr - _heapbase) / BLOCKSIZE + 1; + type = _heapinfo[block].busy.type; + oldsize = + type == 0 ? _heapinfo[block].busy.info.size * BLOCKSIZE + : (size_t) 1 << type; + result = malloc (size); + if (result) + return memcpy (result, ptr, min (oldsize, size)); + return result; +} + +#ifdef HYBRID_GET_CURRENT_DIR_NAME +/* Defined in sysdep.c. */ +char *gget_current_dir_name (void); + +char * +hybrid_get_current_dir_name (void) +{ + if (DUMPED) + return get_current_dir_name (); + return gget_current_dir_name (); +} +#endif + +#endif /* HYBRID_MALLOC */ + +#ifdef GC_MCHECK + +/* Standard debugging hooks for `malloc'. + Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc. + Written May 1989 by Mike Haertel. + +This library is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public +License along with this library. If not, see <http://www.gnu.org/licenses/>. + + The author may be reached (Email) at the address mike@ai.mit.edu, + or (US mail) as Mike Haertel c/o Free Software Foundation. */ + +#include <stdio.h> + +/* Old hook values. */ +static void (*old_free_hook) (void *ptr); +static void *(*old_malloc_hook) (size_t size); +static void *(*old_realloc_hook) (void *ptr, size_t size); + +/* Function to call when something awful happens. */ +static void (*abortfunc) (enum mcheck_status); + +/* Arbitrary magical numbers. */ +#define MAGICWORD (SIZE_MAX / 11 ^ SIZE_MAX / 13 << 3) +#define MAGICFREE (SIZE_MAX / 17 ^ SIZE_MAX / 19 << 4) +#define MAGICBYTE ((char) 0xd7) +#define MALLOCFLOOD ((char) 0x93) +#define FREEFLOOD ((char) 0x95) + +struct hdr + { + size_t size; /* Exact size requested by user. */ + size_t magic; /* Magic number to check header integrity. */ + }; + +static enum mcheck_status +checkhdr (const struct hdr *hdr) +{ + enum mcheck_status status; + switch (hdr->magic) + { + default: + status = MCHECK_HEAD; + break; + case MAGICFREE: + status = MCHECK_FREE; + break; + case MAGICWORD: + if (((char *) &hdr[1])[hdr->size] != MAGICBYTE) + status = MCHECK_TAIL; + else + status = MCHECK_OK; + break; + } + if (status != MCHECK_OK) + (*abortfunc) (status); + return status; +} + +static void +freehook (void *ptr) +{ + struct hdr *hdr; + + if (ptr) + { + struct alignlist *l; + + /* If the block was allocated by aligned_alloc, its real pointer + to free is recorded in _aligned_blocks; find that. */ + PROTECT_MALLOC_STATE (0); + LOCK_ALIGNED_BLOCKS (); + for (l = _aligned_blocks; l != NULL; l = l->next) + if (l->aligned == ptr) + { + l->aligned = NULL; /* Mark the slot in the list as free. */ + ptr = l->exact; + break; + } + UNLOCK_ALIGNED_BLOCKS (); + PROTECT_MALLOC_STATE (1); + + hdr = ((struct hdr *) ptr) - 1; + checkhdr (hdr); + hdr->magic = MAGICFREE; + memset (ptr, FREEFLOOD, hdr->size); + } + else + hdr = NULL; + + __free_hook = old_free_hook; + free (hdr); + __free_hook = freehook; +} + +static void * +mallochook (size_t size) +{ + struct hdr *hdr; + + __malloc_hook = old_malloc_hook; + hdr = malloc (sizeof *hdr + size + 1); + __malloc_hook = mallochook; + if (hdr == NULL) + return NULL; + + hdr->size = size; + hdr->magic = MAGICWORD; + ((char *) &hdr[1])[size] = MAGICBYTE; + return memset (hdr + 1, MALLOCFLOOD, size); +} + +static void * +reallochook (void *ptr, size_t size) +{ + struct hdr *hdr = NULL; + size_t osize = 0; + + if (ptr) + { + hdr = ((struct hdr *) ptr) - 1; + osize = hdr->size; + + checkhdr (hdr); + if (size < osize) + memset ((char *) ptr + size, FREEFLOOD, osize - size); + } + + __free_hook = old_free_hook; + __malloc_hook = old_malloc_hook; + __realloc_hook = old_realloc_hook; + hdr = realloc (hdr, sizeof *hdr + size + 1); + __free_hook = freehook; + __malloc_hook = mallochook; + __realloc_hook = reallochook; + if (hdr == NULL) + return NULL; + + hdr->size = size; + hdr->magic = MAGICWORD; + ((char *) &hdr[1])[size] = MAGICBYTE; + if (size > osize) + memset ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize); + return hdr + 1; +} + +static void +mabort (enum mcheck_status status) +{ + const char *msg; + switch (status) + { + case MCHECK_OK: + msg = "memory is consistent, library is buggy"; + break; + case MCHECK_HEAD: + msg = "memory clobbered before allocated block"; + break; + case MCHECK_TAIL: + msg = "memory clobbered past end of allocated block"; + break; + case MCHECK_FREE: + msg = "block freed twice"; + break; + default: + msg = "bogus mcheck_status, library is buggy"; + break; + } +#ifdef __GNU_LIBRARY__ + __libc_fatal (msg); +#else + fprintf (stderr, "mcheck: %s\n", msg); + fflush (stderr); +# ifdef emacs + emacs_abort (); +# else + abort (); +# endif +#endif +} + +static int mcheck_used = 0; + +int +mcheck (void (*func) (enum mcheck_status)) +{ + abortfunc = (func != NULL) ? func : &mabort; + + /* These hooks may not be safely inserted if malloc is already in use. */ + if (!__malloc_initialized && !mcheck_used) + { + old_free_hook = __free_hook; + __free_hook = freehook; + old_malloc_hook = __malloc_hook; + __malloc_hook = mallochook; + old_realloc_hook = __realloc_hook; + __realloc_hook = reallochook; + mcheck_used = 1; + } + + return mcheck_used ? 0 : -1; +} + +enum mcheck_status +mprobe (void *ptr) +{ + return mcheck_used ? checkhdr (ptr) : MCHECK_DISABLED; +} + +#endif /* GC_MCHECK */ |