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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. 
|| $Id: interpret.h,v 1.135 2003/04/03 14:56:26 grubba Exp $ 
*/ 
 
#ifndef INTERPRET_H 
#define INTERPRET_H 
 
#include "global.h" 
#include "program.h" 
#include "pike_error.h" 
#include "bignum.h" 
 
struct Pike_interpreter { 
  /* Swapped variables */ 
  struct svalue *stack_pointer; 
  struct svalue *evaluator_stack; 
  struct svalue **mark_stack_pointer; 
  struct svalue **mark_stack; 
  struct pike_frame *frame_pointer; 
  int evaluator_stack_malloced; 
  int mark_stack_malloced; 
  JMP_BUF *recoveries; 
#ifdef PIKE_THREADS 
  struct thread_state *thread_state; 
#endif 
  char *stack_top; 
  DO_IF_SECURITY(struct object *current_creds;) 
 
  int svalue_stack_margin; 
  int c_stack_margin; 
 
#ifdef PROFILING 
#ifdef HAVE_GETHRTIME 
  long long accounted_time; 
  long long time_base; 
#endif 
  char *stack_bottom; 
#endif 
 
  int trace_level; 
}; 
 
#ifndef STRUCT_FRAME_DECLARED 
#define STRUCT_FRAME_DECLARED 
#endif 
struct pike_frame 
{ 
  INT32 refs; /* must be first */ 
  INT32 args;                       /* Actual number of arguments. */ 
  unsigned INT16 fun;               /* Function number. */ 
  INT16 num_locals;             /* Number of local variables. */ 
  INT16 num_args;               /* Number of argument variables. */ 
  unsigned INT16 flags;             /* PIKE_FRAME_* */ 
  INT16 ident; 
  struct pike_frame *next; 
  struct pike_frame *scope; 
  PIKE_OPCODE_T *pc;            /* Program counter of last/next opcode. */ 
  struct svalue *locals;    /* Start of local variables. */ 
 
  /*  This is <= locals, and this is where the 
   * return value should go. 
   */ 
  struct svalue *save_sp; 
 
  /* This tells us the current level of 
   * svalues on the stack that can be discarded once the 
   * current function is done with them 
   */ 
  struct svalue *expendible; 
  struct svalue **save_mark_sp; 
  struct svalue **mark_sp_base; 
  struct object *current_object; 
 
  DO_IF_SECURITY(struct object *current_creds;) 
#if defined(PROFILING) && defined(HAVE_GETHRTIME) 
  long long children_base; 
  long long start_time; 
  INT32 self_time_base; 
#endif 
  struct inherit context; 
  char *current_storage; 
}; 
 
#define PIKE_FRAME_RETURN_INTERNAL 1 
#define PIKE_FRAME_RETURN_POP 2 
#define PIKE_FRAME_MALLOCED_LOCALS 0x8000 
 
struct external_variable_context 
{ 
  struct object *o; 
  struct inherit *inherit; 
  int parent_identifier; 
}; 
 
#ifdef HAVE_COMPUTED_GOTO 
extern PIKE_OPCODE_T *fcode_to_opcode; 
extern struct op_2_f { 
  PIKE_OPCODE_T opcode; 
  INT32 fcode; 
} *opcode_to_fcode; 
#endif /* HAVE_COMPUTED_GOTO */ 
 
#ifdef PIKE_DEBUG 
PMOD_EXPORT extern const char msg_stack_error[]; 
#define debug_check_stack() do{if(Pike_sp<Pike_interpreter.evaluator_stack)Pike_fatal(msg_stack_error);}while(0) 
#define check__positive(X,Y) if((X)<0) Pike_fatal Y 
#include "pike_error.h" 
#else 
#define check__positive(X,Y) 
#define debug_check_stack()  
#endif 
 
#define low_stack_check(X) \ 
  (Pike_sp - Pike_interpreter.evaluator_stack + \ 
   Pike_interpreter.svalue_stack_margin + (X) >= Pike_stack_size) 
 
PMOD_EXPORT extern const char Pike_check_stack_errmsg[]; 
 
#define check_stack(X) do { \ 
  if(low_stack_check(X)) \ 
    ((void (*)(const char *, ...))Pike_error)( \ 
               Pike_check_stack_errmsg, \ 
               PTRDIFF_T_TO_LONG(Pike_sp - Pike_interpreter.evaluator_stack), \ 
               PTRDIFF_T_TO_LONG(Pike_stack_size), \ 
               PTRDIFF_T_TO_LONG(X)); \ 
  }while(0) 
 
PMOD_EXPORT extern const char Pike_check_mark_stack_errmsg[]; 
 
#define check_mark_stack(X) do {              \ 
  if(Pike_mark_sp - Pike_interpreter.mark_stack + (X) >= Pike_stack_size) \ 
    ((void (*)(const char*, ...))Pike_error)(Pike_check_mark_stack_errmsg); \ 
  }while(0) 
 
PMOD_EXPORT extern const char Pike_check_c_stack_errmsg[]; 
 
#define check_c_stack(X) do {                                         \ 
  ptrdiff_t x_= ((char *)&x_) +                                         \ 
    STACK_DIRECTION * (Pike_interpreter.c_stack_margin + (X)) -         \ 
    Pike_interpreter.stack_top ;                                        \ 
  x_*=STACK_DIRECTION;                                                  \ 
  if(x_>0)                                                              \ 
    ((void (*)(const char*, ...))low_error)(Pike_check_c_stack_errmsg); \ 
  }while(0) 
 
#define fatal_check_c_stack(X) do {                   \ 
    ptrdiff_t x_=                                       \ 
      ((char *)&x_) + STACK_DIRECTION * (X) - Pike_interpreter.stack_top ; \ 
    x_*=STACK_DIRECTION;                                                \ 
    if(x_>0) {                                                          \ 
      ((void (*)(const char*, ...))Pike_fatal)(Pike_check_c_stack_errmsg);      \ 
    }                                                                   \ 
  }while(0) 
 
 
#ifdef PIKE_DEBUG 
#define STACK_LEVEL_START(depth)    \ 
  do { \ 
    struct svalue *save_stack_level = (Pike_sp - (depth)) 
 
#define STACK_LEVEL_DONE(depth)               \ 
    STACK_LEVEL_CHECK(depth);           \ 
  } while(0) 
 
#define STACK_LEVEL_CHECK(depth)                                      \ 
  do {                                                                  \ 
    if (Pike_sp != save_stack_level + (depth)) {                        \ 
      Pike_fatal("Unexpected stack level! "                             \ 
                 "Actual: %d, expected: %d\n",                          \ 
                 DO_NOT_WARN((int)(Pike_sp - save_stack_level)),        \ 
                 (depth));                                              \ 
    }                                                                   \ 
  } while(0) 
#else /* !PIKE_DEBUG */ 
#define STACK_LEVEL_START(depth)    do { 
#define STACK_LEVEL_DONE(depth)             } while(0) 
#define STACK_LEVEL_CHECK(depth) 
#endif /* PIKE_DEBUG */ 
 
#define pop_stack() do{ free_svalue(--Pike_sp); debug_check_stack(); }while(0) 
#define pop_2_elems() do { pop_stack(); pop_stack(); }while(0) 
 
#ifdef __ECL 
#define MAYBE_CAST_TO_LONG(X)       (X) 
#else /* !__ECL */ 
#define MAYBE_CAST_TO_LONG(X)       ((long)(X)) 
#endif /* __ECL */ 
 
PMOD_EXPORT extern const char msg_pop_neg[]; 
#define pop_n_elems(X)                                                        \ 
 do { ptrdiff_t x_=(X); if(x_) {                                        \ 
   check__positive(x_, (msg_pop_neg, x_));                              \ 
   Pike_sp -= x_; debug_check_stack();                                  \ 
   free_mixed_svalues(Pike_sp, x_);                                     \ 
 } } while (0) 
 
#define stack_pop_n_elems_keep_top(X) \ 
 do { struct svalue s=Pike_sp[-1]; Pike_sp[-1]=Pike_sp[-1-(X)]; Pike_sp[-1-(X)]=s; \ 
      pop_n_elems(X); } while (0) 
 
#define push_program(P) do{ struct program *_=(P); debug_malloc_touch(_); Pike_sp->u.program=_; Pike_sp++->type=PIKE_T_PROGRAM; }while(0) 
#define push_int(I) do{ INT_TYPE _=(I); Pike_sp->u.integer=_;Pike_sp->type=PIKE_T_INT;Pike_sp++->subtype=NUMBER_NUMBER; }while(0) 
#define push_undefined() do{  Pike_sp->u.integer=0; Pike_sp->type=PIKE_T_INT; Pike_sp++->subtype=NUMBER_UNDEFINED; }while(0) 
#define push_mapping(M) do{ struct mapping *_=(M); debug_malloc_touch(_); Pike_sp->u.mapping=_; Pike_sp++->type=PIKE_T_MAPPING; }while(0) 
#define push_array(A) do{ struct array *_=(A); debug_malloc_touch(_); Pike_sp->u.array=_ ;Pike_sp++->type=PIKE_T_ARRAY; }while(0) 
#define push_multiset(L) do{ struct multiset *_=(L); debug_malloc_touch(_); Pike_sp->u.multiset=_; Pike_sp++->type=PIKE_T_MULTISET; }while(0) 
#define push_string(S) do{ struct pike_string *_=(S); debug_malloc_touch(_); Pike_sp->subtype=0; Pike_sp->u.string=_; Pike_sp++->type=PIKE_T_STRING; }while(0) 
#define push_type_value(S) do{ struct pike_type *_=(S); debug_malloc_touch(_); Pike_sp->u.type=_; Pike_sp++->type=PIKE_T_TYPE; }while(0) 
#define push_object(O) do{ struct object  *_=(O); debug_malloc_touch(_); Pike_sp->u.object=_; Pike_sp++->type=PIKE_T_OBJECT; }while(0) 
#define push_float(F) do{ FLOAT_TYPE _=(F); Pike_sp->u.float_number=_; Pike_sp++->type=PIKE_T_FLOAT; }while(0) 
#define push_text(T) push_string(make_shared_string((T))) 
#define push_constant_text(T) do{ Pike_sp->subtype=0; REF_MAKE_CONST_STRING(Pike_sp->u.string,T); Pike_sp++->type=PIKE_T_STRING; }while(0) 
#define push_function(OBJ, FUN) do {struct object *_=(OBJ); debug_malloc_touch(_); Pike_sp->u.object=_; Pike_sp->subtype=(FUN); Pike_sp++->type=PIKE_T_FUNCTION;} while (0) 
 
#define ref_push_program(P) do{ struct program *_=(P); add_ref(_); Pike_sp->u.program=_; Pike_sp++->type=PIKE_T_PROGRAM; }while(0) 
#define ref_push_mapping(M) do{ struct mapping *_=(M); add_ref(_); Pike_sp->u.mapping=_; Pike_sp++->type=PIKE_T_MAPPING; }while(0) 
#define ref_push_array(A) do{ struct array *_=(A); add_ref(_); Pike_sp->u.array=_ ;Pike_sp++->type=PIKE_T_ARRAY; }while(0) 
#define ref_push_multiset(L) do{ struct multiset *_=(L); add_ref(_); Pike_sp->u.multiset=_; Pike_sp++->type=PIKE_T_MULTISET; }while(0) 
#define ref_push_string(S) do{ struct pike_string *_=(S); add_ref(_); Pike_sp->subtype=0; Pike_sp->u.string=_; Pike_sp++->type=PIKE_T_STRING; }while(0) 
#define ref_push_type_value(S) do{ struct pike_type *_=(S); add_ref(_); Pike_sp->u.type=_; Pike_sp++->type=PIKE_T_TYPE; }while(0) 
#define ref_push_object(O) do{ struct object  *_=(O); add_ref(_); Pike_sp->u.object=_; Pike_sp++->type=PIKE_T_OBJECT; }while(0) 
#define ref_push_function(OBJ, FUN) do {struct object *_=(OBJ); add_ref(_); Pike_sp->u.object=_; Pike_sp->subtype=(FUN); Pike_sp++->type=PIKE_T_FUNCTION;} while (0) 
 
#define push_svalue(S) do { const struct svalue *_=(S); assign_svalue_no_free(Pike_sp,_); Pike_sp++; }while(0) 
 
#define stack_dup() push_svalue(Pike_sp-1) 
#define stack_swap() do { struct svalue _=Pike_sp[-1]; Pike_sp[-1]=Pike_sp[-2]; Pike_sp[-2]=_; } while(0) 
 
#define push_zeroes(N) do{                    \ 
    struct svalue *s_=Pike_sp;                  \ 
    ptrdiff_t num_= (N);                        \ 
    for(;num_-- > 0;s_++)                       \ 
    {                                           \ 
      s_->type=PIKE_T_INT;                      \ 
      s_->subtype=NUMBER_NUMBER;                \ 
      s_->u.integer=0;                          \ 
    }                                           \ 
    Pike_sp=s_;                                 \ 
}while(0) 
 
#define push_undefines(N) do{                 \ 
    struct svalue *s_=Pike_sp;                  \ 
    ptrdiff_t num_= (N);                        \ 
    for(;num_-- > 0;s_++)                       \ 
    {                                           \ 
      s_->type=PIKE_T_INT;                      \ 
      s_->subtype=NUMBER_UNDEFINED;             \ 
      s_->u.integer=0;                          \ 
    }                                           \ 
    Pike_sp=s_;                                 \ 
}while(0) 
 
#define stack_pop_to_no_free(X) move_svalue(X, --Pike_sp) 
#define stack_pop_to(X) do { struct svalue *_=(X); free_svalue(_); stack_pop_to_no_free(_); }while(0) 
 
/* This pops a number of arguments from the stack but keeps the top 
 * element on top. Used for popping the arguments while keeping the 
 * return value. 
 */ 
#define stack_unlink(X) do { if(X) { free_svalue(Pike_sp-(X)-1); Pike_sp[-(X)-1]=Pike_sp[-1]; Pike_sp--; pop_n_elems(X-1); } }while(0) 
 
#define free_pike_frame(F) do{ struct pike_frame *f_=(F); if(!sub_ref(f_)) really_free_pike_frame(f_); }while(0) 
 
/* A scope is any frame which may have malloced locals */ 
#define free_pike_scope(F) do{ struct pike_frame *f_=(F); if(!sub_ref(f_)) really_free_pike_scope(f_); }while(0) 
 
#define POP_PIKE_FRAME() do {                                         \ 
  struct pike_frame *tmp_=Pike_fp->next;                                \ 
  if(!sub_ref(Pike_fp))                                                 \ 
  {                                                                     \ 
    really_free_pike_frame(Pike_fp);                                    \ 
  }else{                                                                \ 
    DO_IF_DEBUG(                                                        \ 
      if( (Pike_fp->locals + Pike_fp->num_locals > Pike_sp) ||          \ 
          (Pike_sp < Pike_fp->expendible))                              \ 
        Pike_fatal("Stack failure in POP_PIKE_FRAME %p+%d=%p %p %p!\n", \ 
                   Pike_fp->locals, Pike_fp->num_locals,                \ 
                   Pike_fp->locals+Pike_fp->num_locals,                 \ 
                   Pike_sp,Pike_fp->expendible));                       \ 
    debug_malloc_touch(Pike_fp);                                        \ 
    if(Pike_fp->num_locals)                                             \ 
    {                                                                   \ 
      struct svalue *s=(struct svalue *)xalloc(sizeof(struct svalue)*   \ 
                                               Pike_fp->num_locals);    \ 
      assign_svalues_no_free(s, Pike_fp->locals, Pike_fp->num_locals,   \ 
                             BIT_MIXED);                                \ 
      Pike_fp->locals=s;                                                \ 
      Pike_fp->flags|=PIKE_FRAME_MALLOCED_LOCALS;                       \ 
    }else{                                                              \ 
      Pike_fp->locals=0;                                                \ 
    }                                                                   \ 
    Pike_fp->next=0;                                                    \ 
  }                                                                     \ 
  Pike_fp=tmp_;                                                         \ 
 }while(0) 
 
 
enum apply_type 
{ 
  APPLY_STACK, /* The function is the first argument */ 
  APPLY_SVALUE, /* arg1 points to an svalue containing the function */ 
  APPLY_SVALUE_STRICT, /* Like APPLY_SVALUE, but does not return values for void functions */ 
   APPLY_LOW    /* arg1 is the object pointer,(int)arg2 the function */ 
}; 
 
#define APPLY_MASTER(FUN,ARGS) \ 
do{ \ 
  static int fun_, master_cnt=0; \ 
  struct object *master_ob=master(); \ 
  if(master_cnt != master_ob->prog->id) \ 
  { \ 
    fun_=find_identifier(FUN,master_ob->prog); \ 
    master_cnt = master_ob->prog->id; \ 
  } \ 
  apply_low(master_ob, fun_, ARGS); \ 
}while(0) 
 
#define SAFE_APPLY_MASTER(FUN,ARGS) \ 
do{ \ 
  static int fun_, master_cnt=0; \ 
  struct object *master_ob=master(); \ 
  if(master_cnt != master_ob->prog->id) \ 
  { \ 
    fun_=find_identifier(FUN,master_ob->prog); \ 
    master_cnt = master_ob->prog->id; \ 
  } \ 
  safe_apply_low2(master_ob, fun_, ARGS, 1); \ 
}while(0) 
 
#define SAFE_APPLY_HANDLER(FUN, HANDLER, COMPAT, ARGS) do {   \ 
    static int h_fun_=-1, h_id_=0;                              \ 
    static int c_fun_=-1, c_fun_id_=0;                          \ 
    struct object *h_=(HANDLER), *c_=(COMPAT);                  \ 
    if (h_ && h_->prog) {                                       \ 
      if (h_->prog->id != h_id_) {                              \ 
        h_fun_ = find_identifier(fun, h_->prog);                \ 
        h_id_ = h_->prog->id;                                   \ 
      }                                                         \ 
      if (h_fun_ != -1) {                                       \ 
        safe_apply_low(h_, h_fun_, ARGS);                       \ 
        break;                                                  \ 
      }                                                         \ 
    }                                                           \ 
    if (c_ && c_->prog) {                                       \ 
      if (c_->prog->id != c_id_) {                              \ 
        c_fun_ = find_identifier(fun, c_->prog);                \ 
        c_id_ = c_->prog->id;                                   \ 
      }                                                         \ 
      if (c_fun_ != -1) {                                       \ 
        safe_apply_low(c_, c_fun_, ARGS);                       \ 
        break;                                                  \ 
      }                                                         \ 
    }                                                           \ 
    SAFE_APPLY_MASTER(FUN, ARGS);                               \ 
  } while(0) 
 
 
#ifdef INTERNAL_PROFILING 
PMOD_EXPORT extern unsigned long evaluator_callback_calls; 
#endif 
 
#define check_threads_etc() do { \ 
  DO_IF_INTERNAL_PROFILING (evaluator_callback_calls++); \ 
  call_callback(& evaluator_callbacks, (void *)0); \ 
}while(0)  
 
#ifdef PIKE_DEBUG 
#define fast_check_threads_etc(X) do { \ 
  static int div_; if(d_flag || !(div_++& ((1<<(X))-1))) check_threads_etc(); } while(0) 
 
#else 
#define fast_check_threads_etc(X) do { \ 
  static int div_; if(!(div_++& ((1<<(X))-1))) check_threads_etc(); } while(0) 
#endif 
 
#include "block_alloc_h.h" 
/* Prototypes begin here */ 
void push_sp_mark(void); 
ptrdiff_t pop_sp_mark(void); 
PMOD_EXPORT void init_interpreter(void); 
void lvalue_to_svalue_no_free(struct svalue *to,struct svalue *lval); 
PMOD_EXPORT void assign_lvalue(struct svalue *lval,struct svalue *from); 
PMOD_EXPORT union anything *get_pointer_if_this_type(struct svalue *lval, TYPE_T t); 
void print_return_value(void); 
void reset_evaluator(void); 
struct backlog; 
void dump_backlog(void); 
BLOCK_ALLOC(pike_frame,128) 
 
#if defined (PIKE_DEBUG) && defined (PIKE_USE_MACHINE_CODE) 
void simple_debug_instr_prologue_0 (PIKE_INSTR_T instr); 
void simple_debug_instr_prologue_1 (PIKE_INSTR_T instr, INT32 arg); 
void simple_debug_instr_prologue_2 (PIKE_INSTR_T instr, INT32 arg1, INT32 arg2); 
#endif 
 
PMOD_EXPORT void find_external_context(struct external_variable_context *loc, 
                                       int arg2); 
void really_free_pike_scope(struct pike_frame *scope); 
int low_mega_apply(enum apply_type type, INT32 args, void *arg1, void *arg2); 
void low_return(void); 
void low_return_pop(void); 
void unlink_previous_frame(void); 
void mega_apply(enum apply_type type, INT32 args, void *arg1, void *arg2); 
PMOD_EXPORT void f_call_function(INT32 args); 
PMOD_EXPORT void call_handle_error(void); 
PMOD_EXPORT int apply_low_safe_and_stupid(struct object *o, INT32 offset); 
PMOD_EXPORT void safe_apply_low(struct object *o,int fun,int args); 
PMOD_EXPORT void safe_apply_low2(struct object *o,int fun,int args, int handle_errors); 
PMOD_EXPORT void safe_apply(struct object *o, const char *fun ,INT32 args); 
PMOD_EXPORT int low_unsafe_apply_handler(const char *fun, 
                                         struct object *handler, 
                                         struct object *compat, 
                                         INT32 args); 
PMOD_EXPORT void low_safe_apply_handler(const char *fun, 
                                        struct object *handler, 
                                        struct object *compat, 
                                        INT32 args); 
PMOD_EXPORT int safe_apply_handler(const char *fun, 
                                   struct object *handler, 
                                   struct object *compat, 
                                   INT32 args, 
                                   TYPE_FIELD rettypes); 
PMOD_EXPORT void apply_lfun(struct object *o, int fun, int args); 
PMOD_EXPORT void apply_shared(struct object *o, 
                  struct pike_string *fun, 
                  int args); 
PMOD_EXPORT void apply(struct object *o, const char *fun, int args); 
PMOD_EXPORT void apply_svalue(struct svalue *s, INT32 args); 
PMOD_EXPORT void apply_external(int depth, int fun, INT32 args); 
PMOD_EXPORT void slow_check_stack(void); 
PMOD_EXPORT void custom_check_stack(ptrdiff_t amount, const char *fmt, ...) 
  ATTRIBUTE((format (printf, 2, 3))); 
PMOD_EXPORT void cleanup_interpret(void); 
void really_clean_up_interpret(void); 
/* Prototypes end here */ 
 
/* These need to be after the prototypes, 
 * to avoid implicit declaration of mega_apply(). 
 */ 
#ifdef __ECL 
static inline void apply_low(struct object *o, ptrdiff_t fun, INT32 args) 
{ 
  mega_apply(APPLY_LOW, args, (void*)o, (void*)fun); 
} 
 
static inline void strict_apply_svalue(struct svalue *sval, INT32 args) 
{ 
  mega_apply(APPLY_SVALUE_STRICT, args, (void*)sval, 0); 
} 
#else /* !__ECL */ 
#define apply_low(O,FUN,ARGS) \ 
  mega_apply(APPLY_LOW, (ARGS), (void*)(O),(void*)(ptrdiff_t)(FUN)) 
 
#define strict_apply_svalue(SVAL,ARGS) \ 
  mega_apply(APPLY_SVALUE, (ARGS), (void*)(SVAL),0) 
#endif /* __ECL */ 
 
#define apply_current(FUN, ARGS)                      \ 
  apply_low(Pike_fp->current_object,                    \ 
            (FUN) + Pike_fp->context.identifier_level,  \ 
            (ARGS)) 
 
PMOD_EXPORT extern int d_flag; /* really in main.c */ 
 
PMOD_EXPORT extern int Pike_stack_size; 
PMOD_EXPORT struct callback; 
PMOD_EXPORT extern struct callback_list evaluator_callbacks; 
 
/* Things to try: 
 * we could reduce thread swapping to a pointer operation if 
 * we do something like: 
 *   #define Pike_interpreter (*Pike_interpreter_pointer) 
 * 
 * Since global variables are usually accessed through indirection 
 * anyways, it might not make any speed differance. 
 * 
 * The above define could also be used to facilitate dynamic loading 
 * on Win32.. 
 */ 
PMOD_EXPORT extern struct Pike_interpreter Pike_interpreter; 
 
#define Pike_sp Pike_interpreter.stack_pointer 
#define Pike_fp Pike_interpreter.frame_pointer 
#define Pike_mark_sp Pike_interpreter.mark_stack_pointer 
 
 
#define CURRENT_STORAGE (dmalloc_touch(struct pike_frame *,Pike_fp)->current_storage) 
 
 
#define PIKE_STACK_MMAPPED 
 
struct Pike_stack 
{ 
  struct svalue *top; 
  int flags; 
  struct Pike_stack *previous; 
  struct svalue *save_ptr; 
  struct svalue stack[1]; 
}; 
 
 
#define PIKE_STACK_REQUIRE_BEGIN(num, base) do {                      \ 
  struct Pike_stack *old_stack_;                                        \ 
  if(Pike_interpreter.current_stack->top - Pike_sp < num)               \ 
  {                                                                     \ 
    old_stack_=Pike_interpreter.current_stack;                          \ 
    old_stack_->save_ptr=Pike_sp;                                       \ 
    Pike_interpreter.current_stack=allocate_array(MAXIMUM(num, 8192));  \ 
    while(old_sp > base) *(Pike_sp++) = *--old_stack_->save_ptr;        \ 
  } 
 
#define PIKE_STACK_REQUIRE_END()                                         \ 
  while(Pike_sp > Pike_interpreter.current_stack->stack)                   \ 
    *(old_stack_->save_ptr++) = *--Pike_sp;                                \ 
  Pike_interpreter.current_stack=Pike_interpreter.current_stack->previous; \ 
}while(0)   
 
#endif