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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 INTERPRET_H 
#define INTERPRET_H 
 
#include "global.h" 
#include "program.h" 
#include "pike_error.h" 
#include "object.h" 
#include "pike_rusage.h" 
#include "pikecode.h" 
 
struct catch_context 
{ 
  struct catch_context *prev; 
  JMP_BUF recovery; 
  PIKE_OPCODE_T *next_addr; 
  ptrdiff_t continue_reladdr; 
#ifdef PIKE_DEBUG 
  struct pike_frame *frame; 
#endif 
}; 
 
struct Pike_interpreter_struct { 
  /* Swapped variables */ 
  struct svalue *stack_pointer; 
  struct svalue *evaluator_stack; 
  struct svalue **mark_stack_pointer; 
  struct svalue **mark_stack; 
  struct pike_frame *frame_pointer; 
  JMP_BUF *recoveries; 
#ifdef PIKE_THREADS 
  struct thread_state *thread_state; 
#endif 
  char *stack_top; 
 
  struct catch_context *catch_ctx; 
  LOW_JMP_BUF *catching_eval_jmpbuf; 
 
  int svalue_stack_margin; 
  int c_stack_margin; 
 
  INT16 evaluator_stack_malloced; 
  INT16 mark_stack_malloced; 
 
#ifdef PROFILING 
  cpu_time_t accounted_time;    /** Time spent and accounted for so far. */ 
  cpu_time_t unlocked_time;     /** Time spent unlocked so far. */ 
  char *stack_bottom; 
#endif 
 
  int trace_level; 
}; 
 
#ifndef STRUCT_FRAME_DECLARED 
#define STRUCT_FRAME_DECLARED 
#endif 
struct pike_frame 
{ 
  GC_MARKER_MEMBERS; 
  unsigned INT16 fun;               /** Function number. */ 
  INT16 ident;                  /** Function identifier offset */ 
 
  /* The folloing fields are only used during setup and teardown */ 
 
  struct pike_frame *next;      /** parent frame */ 
  struct pike_frame *scope;     /** scope */ 
  struct svalue **save_mark_sp; /** saved mark sp level */ 
 
  PIKE_OPCODE_T *pc;            /** Address of current opcode. */ 
  struct svalue *locals;    /** Start of local variables. */ 
  char *current_storage;        /** == current_object->storage + context->storage_offset */ 
  struct object *current_object; 
  struct inherit *context;              /** inherit context */ 
  struct program *current_program;  /* program containing the context. */ 
  PIKE_OPCODE_T *return_addr;           /** Address of opcode to continue at after call. */ 
 
  /** 
   * If PIKE_FRAME_SAVE_LOCALS is set, this is a pointer to a bitmask 
   * represented by an array of 16-bit ints. A set bit indicates that 
   * the corresponding local variable is used from a subscope and 
   * needs to be preserved in LOW_POP_PIKE_FRAME. The least 
   * significant bit of the first entry represents the first local 
   * variable and so on. The array is (num_locals >> 4) + 1 entries 
   * (i.e. it will always have enough space to represent all 
   * locals). */ 
  unsigned INT16 *save_locals_bitmask; 
 
  /** 
   * This tells us the current level of svalues on the stack that can 
   * be discarded once the current function is done with them. It is an offset 
   * from locals and is always positive. 
   */ 
  INT16 num_locals;             /** Number of local variables. */ 
  INT16 num_args;               /** Number of argument variables. */ 
 
  INT32 args;                       /** Actual number of arguments passed to the function. */ 
 
  unsigned INT16 flags;             /** PIKE_FRAME_* */ 
 
  /** 
   * This is an offset from locals and denotes the place where the return value 
   * should go. 
   * 
   * It can be -1 if the function to be called is on the stack. 
   * It can be even more negative in case of recursion when the return value location 
   * get replaced by that of the previous frame. 
   */ 
  INT16 save_sp_offset; 
 
#ifdef PROFILING 
  cpu_time_t children_base;     /** Accounted time when the frame started. */ 
  cpu_time_t start_time;        /** Adjusted time when thr frame started. */ 
#endif /* PROFILING */ 
}; 
 
static inline struct svalue *frame_get_save_sp(const struct pike_frame *frame) { 
    return frame->locals + frame->save_sp_offset; 
} 
 
static inline void frame_set_save_sp(struct pike_frame *frame, struct svalue *sv) { 
    ptrdiff_t n = sv - frame->locals; 
#ifdef PIKE_DEBUG 
    if (n < MIN_INT16 || n > MAX_INT16) 
        Pike_error("Save SP offset too large.\n"); 
#endif 
    frame->save_sp_offset = n; 
} 
 
#define PIKE_FRAME_RETURN_INTERNAL 1 
#define PIKE_FRAME_RETURN_POP 2 
#define PIKE_FRAME_SAVE_LOCALS 0x4000 /* save_locals_bitmask is set */ 
#define PIKE_FRAME_MALLOCED_LOCALS 0x8000 
 
#define PIKE_FRAME_RETURN_MASK        (PIKE_FRAME_RETURN_INTERNAL|PIKE_FRAME_RETURN_POP) 
#define PIKE_FRAME_LOCALS_MASK        (PIKE_FRAME_SAVE_LOCALS|PIKE_FRAME_MALLOCED_LOCALS) 
 
struct external_variable_context 
{ 
  struct object *o; 
  struct inherit *inherit; 
  int parent_identifier; 
}; 
 
 
 
 
#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("%s", msg_stack_error);}while(0) 
#define check__positive(X,Y) if((X)<0) Pike_fatal Y 
#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, \ 
               (long)(Pike_sp - Pike_interpreter.evaluator_stack),      \ 
               (long)Pike_stack_size,                \ 
               (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 low_check_c_stack(MIN_BYTES, RUN_IF_LOW) do {                 \ 
    ptrdiff_t x_= (((char *)&x_) - Pike_interpreter.stack_top) +        \ 
      STACK_DIRECTION * (MIN_BYTES);                                    \ 
    x_*=STACK_DIRECTION;                                                \ 
    if(x_>0) {RUN_IF_LOW;}                                              \ 
  } while (0) 
 
 
#define check_c_stack(MIN_BYTES) do {                                 \ 
    low_check_c_stack (Pike_interpreter.c_stack_margin + (MIN_BYTES), { \ 
        low_error(Pike_check_c_stack_errmsg);                           \ 
        /* Pike_fatal("C stack overflow: x_:%p &x_:%p top:%p margin:%p\n", \ 
           x_, &x_, Pike_interpreter.stack_top,                         \ 
           Pike_interpreter.c_stack_margin + (MIN_BYTES)); */           \ 
      });                                                               \ 
  }while(0) 
 
#define fatal_check_c_stack(MIN_BYTES) do {                           \ 
    low_check_c_stack ((MIN_BYTES), {                                   \ 
        ((void (*)(const char*, ...))Pike_fatal)(Pike_check_c_stack_errmsg); \ 
      });                                                               \ 
  }while(0) 
 
PMOD_EXPORT extern void check_c_stack_margin(void); 
 
#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",                          \ 
                 (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 */ 
 
#ifdef __CHECKER__ 
#define SET_SVAL_TYPE_CHECKER(S,T) SET_SVAL_TYPE_SUBTYPE(S,T,0) 
#else 
#define SET_SVAL_TYPE_CHECKER(S,T) SET_SVAL_TYPE_DC(S,T) 
#endif 
 
#define pop_stack() do{ free_svalue(--Pike_sp); debug_check_stack(); }while(0) 
#define pop_2_elems() do { pop_stack(); pop_stack(); }while(0) 
 
PMOD_EXPORT extern const char msg_pop_neg[]; 
#define pop_n_elems(X)                                                        \ 
 do {                                                                   \ 
   ptrdiff_t x_=(X);                                                    \ 
   if(x_) {                                                             \ 
     struct svalue *_sp_;                                               \ 
     check__positive(x_, (msg_pop_neg, x_));                            \ 
     _sp_ = Pike_sp = Pike_sp - x_;                                     \ 
     debug_check_stack();                                               \ 
     free_mixed_svalues(_sp_, x_);                                      \ 
   }                                                                    \ 
 } 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 {                                          \ 
    ptrdiff_t x2_ = (X);                                                \ 
    if (x2_) {                                                          \ 
      struct svalue *_sp_ = --Pike_sp;                                  \ 
      free_svalue (_sp_ - x2_);                                         \ 
      move_svalue (_sp_ - x2_, _sp_);                                   \ 
      pop_n_elems (x2_ - 1);                                            \ 
    }                                                                   \ 
  }while(0) 
 
#define stack_pop_n_elems_keep_top(X) stack_unlink(X) 
 
#define stack_pop_keep_top() do {                                     \ 
    struct svalue *_sp_ = --Pike_sp;                                    \ 
    free_svalue (_sp_ - 1);                                             \ 
    move_svalue (_sp_ - 1, _sp_);                                       \ 
    debug_check_stack();                                                \ 
  } while (0) 
 
#define stack_pop_2_elems_keep_top() do {                             \ 
    struct svalue *_sp_ = Pike_sp = Pike_sp - 2;                        \ 
    free_svalue (_sp_ - 1);                                             \ 
    free_svalue (_sp_);                                                 \ 
    move_svalue (_sp_ - 1, _sp_ + 1);                                   \ 
    debug_check_stack();                                                \ 
  } 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) 
 
#define push_program(P) do{                                           \ 
    struct program *_=(P);                                              \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_PROGRAM);                       \ 
    _sp_->u.program=_;                                                  \ 
  }while(0) 
 
#define push_int(I) do{                                                       \ 
    INT_TYPE _=(I);                                                     \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_INT,NUMBER_NUMBER);             \ 
    _sp_->u.integer=_;                                                  \ 
  }while(0) 
 
#define push_undefined() do{                                          \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_INT,NUMBER_UNDEFINED);          \ 
    _sp_->u.integer=0;                                                  \ 
  }while(0) 
 
#define push_obj_index(I) do{                                         \ 
    int _=(I);                                                          \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, T_OBJ_INDEX);                          \ 
    _sp_->u.identifier=_;                                               \ 
  }while(0) 
 
#define push_mapping(M) do{                                           \ 
    struct mapping *_=(M);                                              \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_MAPPING);                       \ 
    _sp_->u.mapping=_;                                                  \ 
  }while(0) 
 
#define push_array(A) do{                                             \ 
    struct array *_=(A);                                                \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_ARRAY);                         \ 
    _sp_->u.array=_ ;                                                   \ 
  }while(0) 
 
#define push_empty_array() ref_push_array(&empty_array) 
 
#define push_multiset(L) do{                                          \ 
    struct multiset *_=(L);                                             \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_MULTISET);                      \ 
    _sp_->u.multiset=_;                                                 \ 
  }while(0) 
 
#define push_string(S) do {                                           \ 
    struct pike_string *_=(S);                                          \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    DO_IF_DEBUG(if(_->size_shift & ~3) {                                \ 
                  Pike_fatal("Pushing string with bad shift: %d\n",     \ 
                             _->size_shift);                            \ 
                });                                                     \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_STRING,0);                      \ 
    _sp_->u.string=_;                                                   \ 
  }while(0) 
 
#define push_empty_string() ref_push_string(empty_pike_string) 
PMOD_EXPORT void push_random_string(unsigned len); 
 
#define push_type_value(S) do{                                                \ 
    struct pike_type *_=(S);                                            \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_TYPE);                          \ 
    _sp_->u.type=_;                                                     \ 
  }while(0) 
 
#define push_object(O) push_object_inherit(O,0) 
 
#define push_object_inherit(O, INH_NUM) do {                          \ 
    struct object *_ = (O);                                             \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    int _inh_ = (INH_NUM);                                              \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_OBJECT,_inh_);                  \ 
    _sp_->u.object = _;                                                 \ 
  }while(0) 
 
#define push_float(F) do{                                             \ 
    FLOAT_TYPE _=(F);                                                   \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_FLOAT);                         \ 
    _sp_->u.float_number=_;                                             \ 
  }while(0) 
 
PMOD_EXPORT extern void push_text( const char *x ); 
PMOD_EXPORT extern void push_static_text( const char *x ); 
 
#define push_constant_text(T) do{                                     \ 
    struct svalue *_sp_ = Pike_sp;                                      \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_STRING,0);                      \ 
    REF_MAKE_CONST_STRING(_sp_->u.string,T);                            \ 
    Pike_sp = _sp_ + 1;                                                 \ 
  }while(0) 
 
#define push_constant_string_code(STR, CODE) do{                      \ 
    struct pike_string *STR;                                            \ 
    REF_MAKE_CONST_STRING_CODE (STR, CODE);                             \ 
    push_string (STR);                                                  \ 
  }while(0) 
 
#define push_function(OBJ, FUN) do {                                  \ 
    INT16 _fun_ = (FUN);                                                \ 
    struct object *_=(OBJ);                                             \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    debug_malloc_touch(_);                                              \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_FUNCTION, _fun_);               \ 
    _sp_->u.object=_;                                                   \ 
  } while (0) 
 
#define ref_push_program(P) do{                                               \ 
    struct program *_=(P);                                              \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_PROGRAM);                       \ 
    _sp_->u.program=_;                                                  \ 
  }while(0) 
 
#define ref_push_mapping(M) do{                                               \ 
    struct mapping *_=(M);                                              \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_MAPPING);                       \ 
    _sp_->u.mapping=_;                                                  \ 
  }while(0) 
 
#define ref_push_array(A) do{                                         \ 
    struct array *_=(A);                                                \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_ARRAY);                         \ 
    _sp_->u.array=_ ;                                                   \ 
  }while(0) 
 
#define ref_push_multiset(L) do{                                      \ 
    struct multiset *_=(L);                                             \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_CHECKER(*_sp_, PIKE_T_MULTISET);                      \ 
    _sp_->u.multiset=_;                                                 \ 
  }while(0) 
 
#define ref_push_string(S) do{                                                \ 
    struct pike_string *_=(S);                                          \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    DO_IF_DEBUG(if(_->size_shift & ~3) {                                \ 
                  Pike_fatal("Pushing string with bad shift: %d\n",     \ 
                             _->size_shift);                            \ 
                });                                                     \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_STRING,0);                      \ 
    _sp_->u.string=_;                                                   \ 
  }while(0) 
 
#define ref_push_type_value(S) do{                                    \ 
    struct pike_type *_=(S);                                            \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_TYPE,0);                        \ 
    _sp_->u.type=_;                                                     \ 
  }while(0) 
 
#define ref_push_object(O) ref_push_object_inherit(O,0) 
 
#define ref_push_object_inherit(O, INH_NUM) do{                               \ 
    INT16 _inherit_ = (INH_NUM);                                        \ 
    struct object  *_ = (O);                                            \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_OBJECT, _inherit_);             \ 
    _sp_->u.object = _;                                                 \ 
  }while(0) 
 
#define ref_push_function(OBJ, FUN) do {                              \ 
    INT16 _fun_ = (FUN);                                                \ 
    struct object *_=(OBJ);                                             \ 
    struct svalue *_sp_ = Pike_sp++;                                    \ 
    add_ref(_);                                                         \ 
    SET_SVAL_TYPE_SUBTYPE(*_sp_, PIKE_T_FUNCTION, _fun_);               \ 
    _sp_->u.object=_;                                                   \ 
  } while (0) 
 
#define push_svalue(S) do {                                           \ 
    const struct svalue *_=(S);                                         \ 
    struct svalue *_sp_ = Pike_sp;                                      \ 
    assign_svalue_no_free(_sp_,_);                                      \ 
    Pike_sp = _sp_ + 1;                                                 \ 
  }while(0) 
 
#define stack_dup() push_svalue(Pike_sp-1) 
 
#define stack_swap() do {                                             \ 
    struct svalue *_sp_ = Pike_sp;                                      \ 
    struct svalue _=_sp_[-1];                                           \ 
    _sp_[-1]=_sp_[-2];                                                  \ 
    _sp_[-2]=_;                                                         \ 
  } while(0) 
 
#define stack_revroll(args) do {                                      \ 
    struct svalue *_sp_ = Pike_sp;                                      \ 
    int _args_ = (args); struct svalue _=_sp_[-1];                      \ 
    memmove(_sp_-_args_+1, _sp_-_args_, (_args_-1)*sizeof(struct svalue)); \ 
    _sp_[-_args_]=_;                                                    \ 
  } while(0) 
 
#if PIKE_T_INT+NUMBER_NUMBER==0 && defined(HAS___BUILTIN_MEMSET) 
#define push_zeroes(N) do{                                    \ 
    ptrdiff_t num_ = (N);                                       \ 
    __builtin_memset(Pike_sp,0,sizeof(struct svalue)*(num_));   \ 
    Pike_sp+=num_;                                              \ 
  } while(0); 
#else 
#define push_zeroes(N) do{                    \ 
    struct svalue *s_ = Pike_sp;                \ 
    ptrdiff_t num_= (N);                        \ 
    for(;num_-- > 0;s_++)                       \ 
    {                                           \ 
      SET_SVAL_TYPE_SUBTYPE(*s_, PIKE_T_INT,NUMBER_NUMBER);     \ 
      s_->u.integer=0;                          \ 
    }                                           \ 
    Pike_sp=s_;                                 \ 
}while(0) 
#endif 
 
#define push_undefines(N) do{                 \ 
    struct svalue *s_ = Pike_sp;                \ 
    ptrdiff_t num_= (N);                        \ 
    for(;num_-- > 0;s_++)                       \ 
    {                                           \ 
      SET_SVAL_TYPE_SUBTYPE(*s_, PIKE_T_INT,NUMBER_UNDEFINED);  \ 
      s_->u.integer=0;                          \ 
    }                                           \ 
    Pike_sp=s_;                                 \ 
}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 ASSIGN_CURRENT_STORAGE(VAR, TYPE, INH, EXPECTED_PROGRAM)      \ 
  do {                                                                  \ 
    int inh__ = (INH);                                                  \ 
    DO_IF_DEBUG(                                                        \ 
      struct program *prog__ = (EXPECTED_PROGRAM);                      \ 
      if ((inh__ < 0) ||                                                \ 
          (inh__ >= Pike_fp->context->prog->num_inherits))              \ 
        Pike_fatal("Inherit #%d out of range [0..%d]\n",                \ 
                   inh__, Pike_fp->context->prog->num_inherits-1);      \ 
      if (prog__ && (Pike_fp->context[inh__].prog != prog__))           \ 
        Pike_fatal("Inherit #%d has wrong program %p != %p.\n",         \ 
                   Pike_fp->context[inh__].prog, prog__);               \ 
    );                                                                  \ 
    VAR = ((TYPE *)(Pike_fp->current_object->storage +                  \ 
                    Pike_fp->context[inh__].storage_offset));           \ 
  } 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 */ 
}; 
 
PMOD_EXPORT void apply_master(const char* fun, INT32 args, int mode); 
#define APPLY_MASTER(FUN,ARGS) apply_master(FUN,ARGS,1) 
#define SAFE_APPLY_MASTER(FUN,ARGS) apply_master(FUN,ARGS,2) 
#define SAFE_MAYBE_APPLY_MASTER(FUN,ARGS) apply_master(FUN,ARGS,3); 
 
#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 low_check_threads_etc() do { \ 
  DO_IF_INTERNAL_PROFILING (evaluator_callback_calls++); \ 
  call_callback(& evaluator_callbacks, NULL); \ 
}while(0) 
 
#define check_threads_etc() do {                                      \ 
    DO_IF_DEBUG (if (Pike_interpreter.trace_level > 2)                  \ 
                   fprintf (stderr, "- thread yield point\n"));         \ 
    low_check_threads_etc();                                            \ 
  } while (0) 
 
extern int fast_check_threads_counter; 
 
#define fast_check_threads_etc(X) do {                                        \ 
    DO_IF_DEBUG (if (Pike_interpreter.trace_level > 2)                  \ 
                   fprintf (stderr, "- thread yield point\n"));         \ 
    if (++fast_check_threads_counter >= (1 << (X))) {                   \ 
      fast_check_threads_counter = 0;                                   \ 
      low_check_threads_etc();                                          \ 
    }                                                                   \ 
  } while(0) 
 
/* Used before any sort of pike level function call. This covers most 
 * code paths. An interval with magnitude 6 on a 2 GHz AMD 64 averages 
 * on 1000-3000 check_threads_etc calls per second in mixed code, but 
 * it can vary greatly - from 0 to 30000+ calls/sec. In a test case 
 * with about 22000 calls/sec, it took 0.042% of the cpu. */ 
#define FAST_CHECK_THREADS_ON_CALL() do {                             \ 
    DO_IF_DEBUG (if (Pike_interpreter.trace_level > 2)                  \ 
                   fprintf (stderr, "- thread yield point\n"));         \ 
    if (++fast_check_threads_counter >= (1 << 6)) {                     \ 
      fast_check_threads_counter = 0;                                   \ 
      low_check_threads_etc();                                          \ 
    }                                                                   \ 
    else if (objects_to_destruct)                                       \ 
      /* De facto pike semantics requires that freed objects are */     \ 
      /* destructed before function calls. Otherwise done through */    \ 
      /* evaluator_callbacks. */                                        \ 
      destruct_objects_to_destruct_cb();                                \ 
  } while (0) 
 
/* Used before any sort of backward branch. This is only a safeguard 
 * for some corner cases with loops without calls - not relevant in 
 * ordinary code. */ 
#define FAST_CHECK_THREADS_ON_BRANCH() fast_check_threads_etc (8) 
 
/* Prototypes begin here */ 
void push_sp_mark(void); 
ptrdiff_t pop_sp_mark(void); 
void gc_mark_stack_external (struct pike_frame *frame, 
                             struct svalue *stack_p, struct svalue *stack); 
PMOD_EXPORT int low_init_interpreter(struct Pike_interpreter_struct *interpreter); 
PMOD_EXPORT void init_interpreter(void); 
int 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); 
#ifdef PIKE_DEBUG 
struct backlog; 
PMOD_EXPORT void dump_backlog(void); 
#endif /* PIKE_DEBUG */ 
struct catch_context *alloc_catch_context(void); 
PMOD_EXPORT void really_free_catch_context( struct catch_context *data ); 
PMOD_EXPORT void really_free_pike_frame( struct pike_frame *X ); 
void count_memory_in_catch_contexts(size_t*, size_t*); 
void count_memory_in_pike_frames(size_t*, size_t*); 
 
/*BLOCK_ALLOC (catch_context, 0);*/ 
/*BLOCK_ALLOC(pike_frame,128);*/ 
 
#ifdef PIKE_USE_MACHINE_CODE 
void call_check_threads_etc(void); 
#if defined(OPCODE_INLINE_BRANCH) || defined(INS_F_JUMP) || \ 
    defined(INS_F_JUMP_WITH_ARG) || defined(INS_F_JUMP_WITH_TWO_ARGS) 
void branch_check_threads_etc(void); 
#endif 
#ifdef OPCODE_INLINE_RETURN 
PIKE_OPCODE_T *inter_return_opcode_F_CATCH(PIKE_OPCODE_T *addr); 
#endif 
#ifdef OPCODE_INLINE_CATCH 
PIKE_OPCODE_T *setup_catch_context(PIKE_OPCODE_T *addr); 
PIKE_OPCODE_T *handle_caught_exception(void); 
#endif 
#ifdef PIKE_DEBUG 
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 
#endif        /* PIKE_USE_MACHINE_CODE */ 
 
PMOD_EXPORT void find_external_context(struct external_variable_context *loc, 
                                       int arg2); 
struct pike_frame *alloc_pike_frame(void); 
void LOW_POP_PIKE_FRAME_slow_path(struct pike_frame *frame); 
void really_free_pike_scope(struct pike_frame *scope); 
void *lower_mega_apply( INT32 args, struct object *o, ptrdiff_t fun ); 
void *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); 
int apply_low_safe_and_stupid(struct object *o, INT32 offset); 
 
PMOD_EXPORT struct Pike_interpreter_struct * pike_get_interpreter_pointer(); 
PMOD_EXPORT void mega_apply(enum apply_type type, INT32 args, void *arg1, void *arg2); 
PMOD_EXPORT void mega_apply_low(INT32 args, void *arg1, ptrdiff_t arg2); 
PMOD_EXPORT void f_call_function(INT32 args); 
PMOD_EXPORT void call_handle_error(void); 
PMOD_EXPORT int safe_apply_low(struct object *o,int fun,int args); 
PMOD_EXPORT int safe_apply_low2(struct object *o,int fun,int args, 
                                 const char *fun_name); 
PMOD_EXPORT int safe_apply(struct object *o, const char *fun ,INT32 args); 
int low_unsafe_apply_handler(const char *fun, 
                                         struct object *handler, 
                                         struct object *compat, 
                                         INT32 args); 
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 safe_apply_svalue (struct svalue *s, INT32 args, int handle_errors); 
PMOD_EXPORT void apply_external(int depth, int fun, INT32 args); 
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); 
PMOD_EXPORT void low_cleanup_interpret(struct Pike_interpreter_struct *interpreter); 
void really_clean_up_interpret(void); 
/* Prototypes end here */ 
 
#define apply_low(O,FUN,ARGS) \ 
  mega_apply_low((ARGS), (void*)(O),(FUN)) 
 
#define strict_apply_svalue(SVAL,ARGS) \ 
  mega_apply(APPLY_SVALUE, (ARGS), (void*)(SVAL),0) 
 
#define apply_current(FUN, ARGS)                      \ 
  apply_low(Pike_fp->current_object,                    \ 
            (FUN) + Pike_fp->context->identifier_level, \ 
            (ARGS)) 
 
#define safe_apply_current(FUN, ARGS)                         \ 
  safe_apply_low(Pike_fp->current_object,                       \ 
                 (FUN) + Pike_fp->context->identifier_level,    \ 
                 (ARGS)) 
 
#define safe_apply_current2(FUN, ARGS, FUNNAME)                       \ 
  safe_apply_low2(Pike_fp->current_object,                      \ 
                  (FUN) + Pike_fp->context->identifier_level,   \ 
                  (ARGS), (FUNNAME)) 
 
PMOD_EXPORT extern int Pike_stack_size; 
struct callback; 
PMOD_EXPORT extern struct callback_list evaluator_callbacks; 
 
PMOD_EXPORT extern struct Pike_interpreter_struct * 
#if defined(__GNUC__) && __GNUC__ >= 3 
    __restrict 
#endif 
    Pike_interpreter_pointer; 
#define Pike_interpreter (*Pike_interpreter_pointer) 
 
#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) 
 
 
 
/* Without fancy accounting stuff. This one can't assume there is an 
 * identifier corresponding to the frame (i.e. _fp_->ident might be 
 * bogus). */ 
PIKE_UNUSED_ATTRIBUTE 
static inline void LOW_POP_PIKE_FRAME(struct pike_frame *frame) 
{ 
  struct pike_frame *tmp = frame->next; 
 
  if (LIKELY(!sub_ref(frame))) 
    really_free_pike_frame(frame); 
  else 
    LOW_POP_PIKE_FRAME_slow_path(frame); 
 
  Pike_fp = tmp; 
} 
 
PIKE_UNUSED_ATTRIBUTE 
static inline void POP_PIKE_FRAME(void) { 
  struct pike_frame *frame = Pike_fp; 
#ifdef PROFILING 
  /* Time spent in this frame + children. */ 
  cpu_time_t time_passed = get_cpu_time() - Pike_interpreter.unlocked_time; 
  /* Time spent in children to this frame. */ 
  cpu_time_t time_in_children; 
  /* Time spent in just this frame. */ 
  cpu_time_t self_time; 
  struct identifier *function; 
  W_PROFILING_DEBUG("%p}: Pop got %" PRINT_CPU_TIME 
                    " (%" PRINT_CPU_TIME ")" 
                    " %" PRINT_CPU_TIME " (%" PRINT_CPU_TIME ")n", 
                    Pike_interpreter.thread_state, time_passed, 
                    frame->start_time, 
                    Pike_interpreter.accounted_time, 
                    frame->children_base); 
  time_passed -= frame->start_time; 
# ifdef PIKE_DEBUG 
  if (time_passed < 0) { 
    Pike_fatal("Negative time_passed: %" PRINT_CPU_TIME 
               " now: %" PRINT_CPU_TIME 
               " unlocked_time: %" PRINT_CPU_TIME 
               " start_time: %" PRINT_CPU_TIME 
               "n", time_passed, get_cpu_time(), 
               Pike_interpreter.unlocked_time, 
               frame->start_time); 
  } 
# endif /* PIKE_DEBUG */ 
  time_in_children = Pike_interpreter.accounted_time - frame->children_base; 
# ifdef PIKE_DEBUG 
  if (time_in_children < 0) { 
    Pike_fatal("Negative time_in_children: %" 
               PRINT_CPU_TIME 
               " accounted_time: %" PRINT_CPU_TIME 
               " children_base: %" PRINT_CPU_TIME 
               "n", time_in_children, 
               Pike_interpreter.accounted_time, 
               frame->children_base); 
  } 
# endif /* PIKE_DEBUG */ 
  self_time = time_passed - time_in_children; 
# ifdef PIKE_DEBUG 
  if (self_time < 0) { 
    Pike_fatal("Negative self_time: %" PRINT_CPU_TIME 
               " time_passed: %" PRINT_CPU_TIME 
               " time_in_children: %" PRINT_CPU_TIME 
               "n", self_time, time_passed, 
               time_in_children); 
  } 
# endif /* PIKE_DEBUG */ 
  Pike_interpreter.accounted_time += self_time; 
  /* FIXME: Can context->prog be NULL? */ 
  function = frame->context->prog->identifiers + frame->ident; 
  if (!--function->recur_depth) 
    function->total_time += time_passed; 
  function->self_time += self_time; 
#endif /* PROFILING */ 
 
  LOW_POP_PIKE_FRAME (frame); 
} 
 
#endif