Source

mino-pypy / pypy / translator / c / src / mem.h

/************************************************************/
/***  C header subsection: operations on LowLevelTypes    ***/

#include <string.h>

/* used by pypy.rlib.rstack, but also by asmgcc */
#define OP_STACK_CURRENT(r)  r = (Signed)&r


#define RAW_MALLOC_ZERO_FILLED 0

#if RAW_MALLOC_ZERO_FILLED

#define OP_RAW_MALLOC(size, r, restype)  {				\
	r = (restype) PyObject_Malloc(size);				\
	if (r != NULL) {						\
	    memset((void*)r, 0, size);					\
	    COUNT_MALLOC;						\
	}								\
    }

#else

#define OP_RAW_MALLOC(size, r, restype)  {				\
	r = (restype) PyObject_Malloc(size);				\
	if (r != NULL) {						\
	    COUNT_MALLOC;						\
	}								\
    }

#endif

#define OP_RAW_FREE(p, r) PyObject_Free(p); COUNT_FREE;

#define OP_RAW_MEMCLEAR(p, size, r) memset((void*)p, 0, size)

#define OP_RAW_MALLOC_USAGE(size, r) r = size

#ifdef MS_WINDOWS
#define alloca  _alloca
#endif

#define OP_STACK_MALLOC(size,r,restype)                                 \
    r = (restype) alloca(size);                                         \
    if (r != NULL) memset((void*) r, 0, size);
    
#define OP_RAW_MEMCOPY(x,y,size,r) memcpy(y,x,size);
#define OP_RAW_MEMMOVE(x,y,size,r) memmove(y,x,size);

/************************************************************/

#define OP_FREE(p)	OP_RAW_FREE(p, do_not_use)

#ifndef COUNT_OP_MALLOCS

#define COUNT_MALLOC	/* nothing */
#define COUNT_FREE	/* nothing */
#define pypy_malloc_counters_results()  /* nothing */

#else /* COUNT_OP_MALLOCS */

static int count_mallocs=0, count_frees=0;

#define COUNT_MALLOC	count_mallocs++
#define COUNT_FREE	count_frees++

#define pypy_malloc_counters_results()  \
    printf("MALLOC COUNTERS: %d %d\n", count_mallocs, count_frees)

#endif /* COUNT_OP_MALLOCS */


/*** tracking raw mallocs and frees for debugging ***/

#ifndef RPY_ASSERT

#  define OP_TRACK_ALLOC_START(addr, r)   /* nothing */
#  define OP_TRACK_ALLOC_STOP(addr, r)    /* nothing */
#  define pypy_debug_alloc_results() /* nothing */

#else /* RPY_ASSERT */

#  define OP_TRACK_ALLOC_START(addr, r)  pypy_debug_alloc_start(addr, \
                                                                __FUNCTION__)
#  define OP_TRACK_ALLOC_STOP(addr, r)   pypy_debug_alloc_stop(addr)

void pypy_debug_alloc_start(void*, const char*);
void pypy_debug_alloc_stop(void*);
void pypy_debug_alloc_results(void);

#endif /* RPY_ASSERT */

/* for Boehm GC */

#ifdef PYPY_USING_BOEHM_GC

#define BOEHM_MALLOC_0_0   GC_MALLOC
#define BOEHM_MALLOC_1_0   GC_MALLOC_ATOMIC
#define BOEHM_MALLOC_0_1   GC_MALLOC
#define BOEHM_MALLOC_1_1   GC_MALLOC_ATOMIC
/* #define BOEHM_MALLOC_0_1   GC_MALLOC_IGNORE_OFF_PAGE */
/* #define BOEHM_MALLOC_1_1   GC_MALLOC_ATOMIC_IGNORE_OFF_PAGE */

#define OP_BOEHM_ZERO_MALLOC(size, r, restype, is_atomic, is_varsize) { \
	r = (restype) BOEHM_MALLOC_ ## is_atomic ## _ ## is_varsize (size); \
	if (r && is_atomic)  /* the non-atomic versions return cleared memory */ \
	    memset((void*) r, 0, size);					\
    }

#define OP_BOEHM_DISAPPEARING_LINK(link, obj, r)			\
    if (GC_base(obj) == NULL)						\
	; /* 'obj' is probably a prebuilt object - it makes no */	\
    /* sense to register it then, and it crashes Boehm in */		\
    /* quite obscure ways */						\
    else								\
	GC_GENERAL_REGISTER_DISAPPEARING_LINK(link, obj)

extern int boehm_gc_finalizer_lock;
void boehm_gc_startup_code(void);
void boehm_gc_finalizer_notifier(void);

#define OP_GC__DISABLE_FINALIZERS(r)  boehm_gc_finalizer_lock++
#define OP_GC__ENABLE_FINALIZERS(r)  (boehm_gc_finalizer_lock--,	\
				      boehm_gc_finalizer_notifier())

#endif /* PYPY_USING_BOEHM_GC */


#ifdef PYPY_USING_NO_GC_AT_ALL
#define OP_BOEHM_ZERO_MALLOC(size, r, restype, is_atomic, is_varsize)	\
    r = (restype) calloc(1, size);
#define OP_BOEHM_DISAPPEARING_LINK(link, obj, r)  /* nothing */
#define OP_GC__DISABLE_FINALIZERS(r)  /* nothing */
#define OP_GC__ENABLE_FINALIZERS(r)  /* nothing */
#endif

/************************************************************/
/* weakref support */

#define OP_CAST_PTR_TO_WEAKREFPTR(x, r)  r = x
#define OP_CAST_WEAKREFPTR_TO_PTR(x, r)  r = x

/************************************************************/
/* dummy version of these operations, e.g. with Boehm */

#define OP_GC_GET_RPY_ROOTS(r)           r = 0
#define OP_GC_GET_RPY_REFERENTS(x, r)    r = 0
#define OP_GC_GET_RPY_MEMORY_USAGE(x, r) r = -1
#define OP_GC_GET_RPY_TYPE_INDEX(x, r)   r = -1
#define OP_GC_IS_RPY_INSTANCE(x, r)      r = 0
#define OP_GC_DUMP_RPY_HEAP(fd, r)       r = 0

/****************************/
/* The "asmgcc" root finder */
/****************************/

#ifndef _MSC_VER
/* Implementation for Linux */
extern char __gcmapstart;
extern char __gcmapend;
extern char __gccallshapes;
extern long pypy_asm_stackwalk(void*, void*);
#define __gcnoreorderhack __gcmapend

/* The following pseudo-instruction is used by --gcrootfinder=asmgcc
   just after a call to tell gcc to put a GCROOT mark on each gc-pointer
   local variable.  All such local variables need to go through a "v =
   pypy_asm_gcroot(v)".  The old value should not be used any more by
   the C code; this prevents the following case from occurring: gcc
   could make two copies of the local variable (e.g. one in the stack
   and one in a register), pass one to GCROOT, and later use the other
   one.  In practice the pypy_asm_gcroot() is often a no-op in the final
   machine code and doesn't prevent most optimizations. */

/* With gcc, getting the asm() right was tricky, though.  The asm() is
   not volatile so that gcc is free to delete it if the output variable
   is not used at all.  We need to prevent gcc from moving the asm()
   *before* the call that could cause a collection; this is the purpose
   of the (unused) __gcnoreorderhack input argument.  Any memory input
   argument would have this effect: as far as gcc knows the call
   instruction can modify arbitrary memory, thus creating the order
   dependency that we want. */

#define pypy_asm_gcroot(p) ({void*_r; \
	    asm ("/* GCROOT %0 */" : "=g" (_r) :       \
		 "0" (p), "m" (__gcnoreorderhack));    \
	    _r; })

#define pypy_asm_gc_nocollect(f) asm volatile ("/* GC_NOCOLLECT " #f " */" \
                                               : : )

#define pypy_asm_keepalive(v)  asm volatile ("/* keepalive %0 */" : : \
                                             "g" (v))

/* marker for trackgcroot.py, and inhibits tail calls */
#define pypy_asm_stack_bottom()  asm volatile ("/* GC_STACK_BOTTOM */" : : : \
                                               "memory")

#define OP_GC_ASMGCROOT_STATIC(i, r)   r =	       \
	i == 0 ? (void*)&__gcmapstart :		       \
	i == 1 ? (void*)&__gcmapend :		       \
	i == 2 ? (void*)&__gccallshapes :	       \
	NULL

#else
/* implementation of asmgcroot for Windows */
extern void* __gcmapstart;
extern void* __gcmapend;
extern char* __gccallshapes;
extern Signed pypy_asm_stackwalk(void*, void*);

/* With the msvc Microsoft Compiler, the optimizer seems free to move
   any code (even asm) that involves local memory (registers and stack).
   The _ReadWriteBarrier function has an effect only where the content
   of a global variable is *really* used.  trackgcroot.py will remove
   the extra instructions: the access to _constant_always_one_ is
   removed, and the multiplication is replaced with a simple move. */

static __forceinline void*
pypy_asm_gcroot(void* _r1)
{
    static volatile int _constant_always_one_ = 1;
    (Signed)_r1 *= _constant_always_one_;
    _ReadWriteBarrier();
    return _r1;
}

#define pypy_asm_gc_nocollect(f) "/* GC_NOCOLLECT " #f " */"

#ifndef _WIN64
#  define pypy_asm_keepalive(v)    __asm { }
#else
   /* is there something cheaper? */
#  define pypy_asm_keepalive(v)    _ReadWriteBarrier();
#endif

static __declspec(noinline) void pypy_asm_stack_bottom() { }

#define OP_GC_ASMGCROOT_STATIC(i, r)		       \
    r =	i == 0 ? (void*)__gcmapstart :		       \
	i == 1 ? (void*)__gcmapend :		       \
	i == 2 ? (void*)&__gccallshapes :	       \
	NULL

#endif
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