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/* 
|| This file is part of Pike. For copyright information see COPYRIGHT. 
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING 
|| for more information. 
*/ 
 
#ifndef MEMORY_H 
#define MEMORY_H 
 
#include "global.h" 
#include "stralloc.h" 
 
#ifdef USE_VALGRIND 
 
#define HAVE_VALGRIND_MACROS 
/* Assume that any of the following header files have the macros we 
 * need. Haven't checked if it's true or not. */ 
 
#ifdef HAVE_MEMCHECK_H 
#include <memcheck.h> 
#elif defined(HAVE_VALGRIND_MEMCHECK_H) 
#include <valgrind/memcheck.h> 
#elif defined(HAVE_VALGRIND_H) 
#include <valgrind.h> 
#else 
#undef HAVE_VALGRIND_MACROS 
#endif 
 
#endif        /* USE_VALGRIND */ 
 
#ifdef HAVE_VALGRIND_MACROS 
 
#ifndef VALGRIND_MAKE_MEM_NOACCESS 
#define VALGRIND_MAKE_MEM_NOACCESS VALGRIND_MAKE_NOACCESS 
#define VALGRIND_MAKE_MEM_UNDEFINED VALGRIND_MAKE_WRITABLE 
#define VALGRIND_MAKE_MEM_DEFINED VALGRIND_MAKE_READABLE 
#endif 
 
/* No Access */ 
#define PIKE_MEM_NA(lvalue) do {                                      \ 
    PIKE_MEM_NA_RANGE(&(lvalue), sizeof (lvalue));                      \ 
  } while (0) 
#define PIKE_MEM_NA_RANGE(addr, bytes) do {                         \ 
    VALGRIND_DISCARD(VALGRIND_MAKE_MEM_NOACCESS(addr, bytes));          \ 
  } while (0) 
 
/* Write Only -- Will become RW when having been written to */ 
#define PIKE_MEM_WO(lvalue) do {                                      \ 
    PIKE_MEM_WO_RANGE(&(lvalue), sizeof (lvalue));                      \ 
  } while (0) 
#define PIKE_MEM_WO_RANGE(addr, bytes) do {                         \ 
    VALGRIND_DISCARD(VALGRIND_MAKE_MEM_UNDEFINED(addr, bytes));         \ 
  } while (0) 
 
/* Read/Write */ 
#define PIKE_MEM_RW(lvalue) do {                                      \ 
    PIKE_MEM_RW_RANGE(&(lvalue), sizeof (lvalue));                      \ 
  } while (0) 
#define PIKE_MEM_RW_RANGE(addr, bytes) do {                         \ 
    VALGRIND_DISCARD(VALGRIND_MAKE_MEM_DEFINED(addr, bytes));           \ 
  } while (0) 
 
/* Read Only -- Not currently supported by valgrind */ 
#define PIKE_MEM_RO(lvalue) do {                                      \ 
    PIKE_MEM_RO_RANGE(&(lvalue), sizeof (lvalue));                      \ 
  } while (0) 
#define PIKE_MEM_RO_RANGE(addr, bytes) do {                         \ 
    VALGRIND_DISCARD(VALGRIND_MAKE_MEM_DEFINED(addr, bytes));           \ 
  } while (0) 
 
/* Return true if a memchecker is in use. */ 
#define PIKE_MEM_CHECKER() RUNNING_ON_VALGRIND 
 
/* Return true if a memchecker reports the memory to not be 
 * addressable (might also print debug messages etc). */ 
#define PIKE_MEM_NOT_ADDR(lvalue)                                     \ 
  PIKE_MEM_NOT_ADDR_RANGE(&(lvalue), sizeof (lvalue)) 
#define PIKE_MEM_NOT_ADDR_RANGE(addr, bytes)                                \ 
  VALGRIND_CHECK_MEM_IS_ADDRESSABLE(addr, bytes) 
 
/* Return true if a memchecker reports the memory to not be defined 
 * (might also print debug messages etc). */ 
#define PIKE_MEM_NOT_DEF(lvalue)                                      \ 
  PIKE_MEM_NOT_DEF_RANGE(&(lvalue), sizeof (lvalue)) 
#define PIKE_MEM_NOT_DEF_RANGE(addr, bytes)                         \ 
  VALGRIND_CHECK_MEM_IS_DEFINED(addr, bytes) 
 
#ifdef VALGRIND_CREATE_MEMPOOL 
# define PIKE_MEMPOOL_CREATE(a)         VALGRIND_CREATE_MEMPOOL(a, 0, 0) 
# define PIKE_MEMPOOL_ALLOC(a, p, l)    VALGRIND_MEMPOOL_ALLOC(a, p, l) 
# define PIKE_MEMPOOL_FREE(a, p, l)     VALGRIND_MEMPOOL_FREE(a, p) 
# define PIKE_MEMPOOL_DESTROY(a)        VALGRIND_DESTROY_MEMPOOL(a) 
#else 
/* somewhat functional alternatives to mempool macros */ 
# define PIKE_MEMPOOL_CREATE(a) 
# define PIKE_MEMPOOL_ALLOC(a, p, l)    PIKE_MEM_WO_RANGE(p, l) 
# define PIKE_MEMPOOL_FREE(a, p, l)     PIKE_MEM_NA_RANGE(p, l) 
# define PIKE_MEMPOOL_DESTROY(a) 
#endif 
 
#else  /* !HAVE_VALGRIND_MACROS */ 
 
#define PIKE_MEM_NA(lvalue)           do {} while (0) 
#define PIKE_MEM_NA_RANGE(addr, bytes)      do {} while (0) 
#define PIKE_MEM_WO(lvalue)         do {} while (0) 
#define PIKE_MEM_WO_RANGE(addr, bytes)      do {} while (0) 
#define PIKE_MEM_RW(lvalue)         do {} while (0) 
#define PIKE_MEM_RW_RANGE(addr, bytes)      do {} while (0) 
#define PIKE_MEM_RO(lvalue)         do {} while (0) 
#define PIKE_MEM_RO_RANGE(addr, bytes)      do {} while (0) 
#define PIKE_MEM_CHECKER()          0 
#define PIKE_MEM_NOT_ADDR(lvalue)   0 
#define PIKE_MEM_NOT_ADDR_RANGE(addr, bytes) 0 
#define PIKE_MEM_NOT_DEF(lvalue)    0 
#define PIKE_MEM_NOT_DEF_RANGE(addr, bytes) 0 
#define PIKE_MEMPOOL_CREATE(a) 
#define PIKE_MEMPOOL_ALLOC(a, p, l) 
#define PIKE_MEMPOOL_FREE(a, p, l) 
#define PIKE_MEMPOOL_DESTROY(a) 
 
#endif        /* !HAVE_VALGRIND_MACROS */ 
 
 
#define MEMSEARCH_LINKS 512 
 
struct link 
{ 
  struct link *next; 
  INT32 key; 
  ptrdiff_t offset; 
}; 
 
enum methods { 
  no_search, 
  use_memchr, 
  memchr_and_memcmp, 
  hubbe_search, 
  boyer_moore 
}; 
 
struct mem_searcher 
{ 
  enum methods method; 
  char *needle; 
  size_t needlelen; 
  size_t hsize, max; 
  struct link links[MEMSEARCH_LINKS]; 
  struct link *set[MEMSEARCH_LINKS]; 
}; 
 
/* 
 * The purpose of this function is to avoid dead store elimination in cases when 
 * sensitive data has to be cleared from memory. 
 */ 
static INLINE void * guaranteed_memset(void * p, int c, size_t n) { 
    volatile char * _p = (char *)p; 
    while (n--) *_p++ = c; 
    return (void *)p; 
} 
 
#include "pike_search.h" 
 
#include "block_alloc_h.h" 
extern int page_size; 
 
/* Note to self: Prototypes must be updated manually /Hubbe */ 
PMOD_EXPORT ptrdiff_t pcharp_memcmp(PCHARP a, PCHARP b, int sz) ATTRIBUTE((pure)); 
PMOD_EXPORT long pcharp_strlen(PCHARP a)  ATTRIBUTE((pure)); 
 
#define MEMCHR0 MEMCHR 
p_wchar1 *MEMCHR1(p_wchar1 *p, p_wchar2 c, ptrdiff_t e)  ATTRIBUTE((pure)); 
p_wchar2 *MEMCHR2(p_wchar2 *p, p_wchar2 c, ptrdiff_t e)  ATTRIBUTE((pure)); 
 
/* PMOD_EXPORT void swap(char *a, char *b, size_t size); */ 
PMOD_EXPORT void reverse(char *memory, size_t nitems, size_t size); 
PMOD_EXPORT void reorder(char *memory, INT32 nitems, INT32 size,INT32 *order); 
 
#if (defined(__i386__) || defined(__amd64__)) && defined(__GNUC__) 
extern PMOD_EXPORT 
#ifdef __i386__ 
__attribute__((fastcall))  
#endif 
size_t (*low_hashmem)(const void *, size_t, size_t, size_t); 
#else 
PMOD_EXPORT size_t low_hashmem(const void *, size_t len, size_t mlen, size_t key) ATTRIBUTE((pure)); 
#endif 
PMOD_EXPORT size_t hashmem(const void *, size_t len, size_t mlen) ATTRIBUTE((pure)); 
/* 
PMOD_EXPORT void memfill(char *to, 
             INT32 tolen, 
             char *from, 
             INT32 fromlen, 
             INT32 offset); 
*/ 
#define MALLOC_FUNCTION  ATTRIBUTE((malloc)) ATTRIBUTE((warn_unused_result)) 
 
PMOD_EXPORT void *debug_xalloc(size_t size) MALLOC_FUNCTION; 
PMOD_EXPORT void *debug_xmalloc(size_t s) MALLOC_FUNCTION; 
PMOD_EXPORT void debug_xfree(void *mem); 
PMOD_EXPORT void *debug_xrealloc(void *m, size_t s) MALLOC_FUNCTION; 
PMOD_EXPORT void *debug_xcalloc(size_t n, size_t s) MALLOC_FUNCTION; 
PMOD_EXPORT void *aligned_alloc(size_t size, size_t alignment) MALLOC_FUNCTION; 
 
#define PIKE_ALIGNTO(x, a)    (((x) + (a)-1) & ~((a)-1)) 
 
PMOD_EXPORT void *mexec_alloc(size_t sz) MALLOC_FUNCTION; 
PMOD_EXPORT void *mexec_realloc(void *ptr, size_t sz) MALLOC_FUNCTION; 
PMOD_EXPORT void mexec_free(void *ptr); 
void init_pike_memory (void); 
void exit_pike_memory (void); 
 
#ifdef DEBUG_MALLOC 
PMOD_EXPORT void * system_malloc(size_t) MALLOC_FUNCTION; 
PMOD_EXPORT void system_free(void *); 
#endif 
 
#undef BLOCK_ALLOC 
 
#ifdef HANDLES_UNALIGNED_MEMORY_ACCESS 
#define DO_IF_ELSE_UNALIGNED_MEMORY_ACCESS(IF, ELSE)        IF 
#else /* !HANDLES_UNALIGNED_MEMORY_ACCESS */ 
#define DO_IF_ELSE_UNALIGNED_MEMORY_ACCESS(IF, ELSE)        ELSE 
#endif /* HANDLES_UNALIGNED_MEMORY_ACCESS */ 
 
/* Determine if we should use our own heap manager for executable 
 * memory. */ 
#if defined(MEXEC_USES_MMAP) || defined (_WIN32) 
#define USE_MY_MEXEC_ALLOC 
#endif 
 
#endif