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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. 
*/ 
 
#include "global.h" 
#include "interpret.h" 
#include "object.h" 
#include "program.h" 
#include "svalue.h" 
#include "array.h" 
#include "mapping.h" 
#include "pike_error.h" 
#include "stralloc.h" 
#include "constants.h" 
#include "pike_macros.h" 
#include "multiset.h" 
#include "backend.h" 
#include "operators.h" 
#include "opcodes.h" 
#include "pike_embed.h" 
#include "lex.h" 
#include "builtin_functions.h" 
#include "signal_handler.h" 
#include "gc.h" 
#include "threads.h" 
#include "callback.h" 
#include "fd_control.h" 
#include "bignum.h" 
#include "pike_types.h" 
#include "pikecode.h" 
 
#include <fcntl.h> 
#include <errno.h> 
#include <ctype.h> 
 
#ifdef HAVE_MMAP 
 
#ifdef HAVE_SYS_MMAN_H 
#include <sys/mman.h> 
#endif 
 
#ifdef MAP_NORESERVE 
#define USE_MMAP_FOR_STACK 
#endif 
#endif 
 
#ifdef USE_DTRACE 
#include "dtrace_probes.h" 
#else 
#include "dtrace/dtrace_probes_disabled.h" 
#endif 
 
/* 
 * Define the default evaluator stack size, used for just about everything. 
 */ 
#define EVALUATOR_STACK_SIZE  100000 
 
#define TRACE_LEN (size_t)(100 + Pike_interpreter.trace_level * 10) 
 
/* Keep some margin on the stack space checks. They're lifted when 
 * handle_error runs to give it some room. */ 
/* Observed in 7.1: 40 was enough, 30 wasn't. */ 
#define SVALUE_STACK_MARGIN (100 + LOW_SVALUE_STACK_MARGIN) 
/* Observed in 7.4: 11000 was enough, 10000 wasn't. */ 
#define C_STACK_MARGIN (20000 + LOW_C_STACK_MARGIN) 
 
/* Another extra margin to use while dumping the raw error in 
 * exit_on_error, so that backtrace_frame._sprintf can be called 
 * then. */ 
#define LOW_SVALUE_STACK_MARGIN 20 
#define LOW_C_STACK_MARGIN 500 
 
#ifdef HAVE_COMPUTED_GOTO 
PIKE_OPCODE_T *fcode_to_opcode = NULL; 
struct op_2_f *opcode_to_fcode = NULL; 
#endif /* HAVE_COMPUTED_GOTO */ 
 
PMOD_EXPORT const char Pike_check_stack_errmsg[] = 
  "Svalue stack overflow. " 
  "(%ld of %ld entries on stack, needed %ld more entries)\n"; 
PMOD_EXPORT const char Pike_check_mark_stack_errmsg[] = 
  "Mark stack overflow.\n"; 
PMOD_EXPORT const char Pike_check_c_stack_errmsg[] = 
  "C stack overflow.\n"; 
#ifdef PIKE_DEBUG 
PMOD_EXPORT const char msg_stack_error[] = 
  "Stack error.\n"; 
PMOD_EXPORT const char msg_pop_neg[] = 
  "Popping negative number of args.... (%"PRINTPTRDIFFT"d) \n"; 
#endif 
 
 
#ifdef PIKE_DEBUG 
static char trace_buffer[2000]; 
#endif 
 
#ifdef INTERNAL_PROFILING 
PMOD_EXPORT unsigned long evaluator_callback_calls = 0; 
#endif 
 
 
int fast_check_threads_counter = 0; 
 
PMOD_EXPORT int Pike_stack_size = EVALUATOR_STACK_SIZE; 
 
static void do_trace_call(struct byte_buffer *buf, INT32 args); 
static void do_trace_func_return (int got_retval, struct object *o, int fun); 
static void do_trace_return (struct byte_buffer *buf, int got_retval); 
static void do_trace_efun_call(const struct svalue *s, INT32 args); 
#ifdef PIKE_DEBUG 
static void do_trace_efun_return(const struct svalue *s, int got_retval); 
#endif 
 
void push_sp_mark(void) 
{ 
  if(Pike_mark_sp == Pike_interpreter.mark_stack + Pike_stack_size) 
    Pike_error("No more mark stack!\n"); 
  *Pike_mark_sp++=Pike_sp; 
} 
ptrdiff_t pop_sp_mark(void) 
{ 
#ifdef PIKE_DEBUG 
  if(Pike_mark_sp < Pike_interpreter.mark_stack) 
    Pike_fatal("Mark stack underflow!\n"); 
#endif 
  return Pike_sp - *--Pike_mark_sp; 
} 
 
 
#ifdef PIKE_DEBUG 
void gc_mark_stack_external (struct pike_frame *f, 
                             struct svalue *stack_p, struct svalue *stack) 
{ 
  for (; f; f = f->next) 
    GC_ENTER (f, T_PIKE_FRAME) { 
      if (!debug_gc_check (f, " as frame on stack")) { 
        gc_mark_external (f->current_object, " in current_object in frame on stack"); 
        gc_mark_external (f->current_program, " in current_program in frame on stack"); 
        if (f->locals) {            /* Check really needed? */ 
          if (f->flags & PIKE_FRAME_MALLOCED_LOCALS) { 
            gc_mark_external_svalues(f->locals, f->num_locals, 
                                     " in malloced locals of trampoline frame on stack"); 
          } else { 
            if (f->locals > stack_p || (stack_p - f->locals) >= 0x10000) { 
              Pike_fatal("Unreasonable locals: stack:%p locals:%p\n", 
                         stack_p, f->locals); 
            } 
            gc_mark_external_svalues (f->locals, stack_p - f->locals, " on svalue stack"); 
            stack_p = f->locals; 
          } 
        } 
      } 
    } GC_LEAVE; 
  if (stack != stack_p) 
    gc_mark_external_svalues (stack, stack_p - stack, " on svalue stack"); 
} 
 
static void gc_check_stack_callback(struct callback *UNUSED(foo), void *UNUSED(bar), void *UNUSED(gazonk)) 
{ 
  if (Pike_interpreter.evaluator_stack 
#ifdef PIKE_DEBUG 
      /* Avoid this if the thread is swapped out. Useful when calling 
       * locate_references from gdb. */ 
      && Pike_sp != (void *) -1 
#endif 
     ) 
    gc_mark_stack_external (Pike_fp, Pike_sp, Pike_interpreter.evaluator_stack); 
} 
#endif 
 
/* Execute Pike code starting at pc. 
 * 
 * Called once with NULL to initialize tables. 
 * 
 * Returns 0 if pc is NULL. 
 * 
 * Returns -1 if the code terminated due to a RETURN. 
 * 
 * Note: All callers except catching_eval_instruction need to save 
 * Pike_interpreter.catching_eval_jmpbuf, zero it, and restore it 
 * afterwards. 
 */ 
static int eval_instruction(PIKE_OPCODE_T *pc); 
 
PMOD_EXPORT int low_init_interpreter(struct Pike_interpreter_struct *interpreter) 
{ 
#ifdef USE_MMAP_FOR_STACK 
  static int fd = -1; 
 
#ifndef MAP_PRIVATE 
#define MAP_PRIVATE 0 
#endif 
 
#ifndef MAP_FAILED 
#define MAP_FAILED -1 
#endif 
 
#ifndef MAP_ANONYMOUS 
#define MAP_ANONYMOUS 0 
  if(fd == -1) 
  { 
    while(1) 
    { 
      fd=open("/dev/zero",O_RDONLY); 
      if(fd >= 0) break; 
      if(errno != EINTR) 
      { 
        interpreter->evaluator_stack=0; 
        interpreter->mark_stack=0; 
        goto use_malloc; 
#define NEED_USE_MALLOC_LABEL 
      } 
    } 
    /* Don't keep this fd on exec() */ 
    set_close_on_exec(fd, 1); 
  } 
#endif 
 
#define MMALLOC(X,Y)                                                  \ 
  (Y *)mmap(0, (X)*sizeof(Y), PROT_READ|PROT_WRITE,                     \ 
            MAP_NORESERVE|MAP_PRIVATE|MAP_ANONYMOUS, fd, 0) 
 
  interpreter->evaluator_stack_malloced = 0; 
  interpreter->mark_stack_malloced = 0; 
  interpreter->evaluator_stack = MMALLOC(Pike_stack_size,struct svalue); 
  interpreter->mark_stack = MMALLOC(Pike_stack_size, struct svalue *); 
  if((char *)MAP_FAILED == (char *)interpreter->evaluator_stack) { 
    interpreter->evaluator_stack = 0; 
    interpreter->evaluator_stack_malloced = 1; 
  } 
  if((char *)MAP_FAILED == (char *)interpreter->mark_stack) { 
    interpreter->mark_stack = 0; 
    interpreter->mark_stack_malloced = 1; 
  } 
 
#ifdef NEED_USE_MALLOC_LABEL 
use_malloc: 
#endif /* NEED_USE_MALLOC_LABEL */ 
 
#else /* !USE_MMAP_FOR_STACK */ 
  interpreter->evaluator_stack = 0; 
  interpreter->evaluator_stack_malloced = 1; 
  interpreter->mark_stack = 0; 
  interpreter->mark_stack_malloced = 1; 
#endif /* USE_MMAP_FOR_STACK */ 
 
  if(!interpreter->evaluator_stack) 
  { 
    if (!(interpreter->evaluator_stack = 
          (struct svalue *)malloc(Pike_stack_size*sizeof(struct svalue)))) 
      return 1;     /* Out of memory (evaluator stack). */ 
  } 
 
  if(!interpreter->mark_stack) 
  { 
    if (!(interpreter->mark_stack = 
          (struct svalue **)malloc(Pike_stack_size*sizeof(struct svalue *)))) 
      return 2;     /* Out of memory (mark stack). */ 
  } 
 
  interpreter->stack_pointer = interpreter->evaluator_stack; 
  interpreter->mark_stack_pointer = interpreter->mark_stack; 
  interpreter->frame_pointer = 0; 
  interpreter->catch_ctx = NULL; 
  interpreter->catching_eval_jmpbuf = NULL; 
 
  interpreter->svalue_stack_margin = SVALUE_STACK_MARGIN; 
  interpreter->c_stack_margin = C_STACK_MARGIN; 
 
#ifdef PROFILING 
  interpreter->unlocked_time = 0; 
  interpreter->accounted_time = 0; 
#endif 
 
  interpreter->trace_level = default_t_flag; 
 
  return 0; /* OK. */ 
} 
 
static struct pike_frame *free_pike_frame; 
 
PMOD_EXPORT void init_interpreter(void) 
{ 
#ifdef USE_VALGRIND 
  { 
    static int create_mempool = 1; 
 
    if (create_mempool) { 
      PIKE_MEMPOOL_CREATE(&free_pike_frame); 
      create_mempool = 0; 
    } 
  } 
#endif 
  if (low_init_interpreter(Pike_interpreter_pointer)) { 
    Pike_fatal("Out of memory initializing the interpreter stack.\n"); 
  } 
 
#ifdef PIKE_DEBUG 
  { 
    static struct callback *spcb; 
    if(!spcb) 
    { 
      spcb=add_gc_callback(gc_check_stack_callback,0,0); 
      dmalloc_accept_leak(spcb); 
    } 
  } 
#endif 
#if defined(HAVE_COMPUTED_GOTO) || defined(PIKE_USE_MACHINE_CODE) 
  { 
    static int tables_need_init=1; 
    if(tables_need_init) { 
      /* Initialize the fcode_to_opcode table / jump labels. */ 
#if !defined(OPCODE_INLINE_RETURN) 
      eval_instruction(NULL); 
#endif 
      tables_need_init=0; 
#ifdef INIT_INTERPRETER_STATE 
      INIT_INTERPRETER_STATE(); 
#endif 
    } 
  } 
#endif /* HAVE_COMPUTED_GOTO || PIKE_USE_MACHINE_CODE */ 
} 
 
/* 
 * lvalues are stored in two svalues in one of these formats: 
 * array[index]   : { array, index } 
 * mapping[index] : { mapping, index } 
 * multiset[index] : { multiset, index } 
 * object[index] : { object, index } (external object indexing) 
 * local variable : { svalue pointer (T_SVALUE_PTR), nothing (T_VOID) } 
 * global variable : { object, identifier index (T_OBJ_INDEX) } (internal object indexing) 
 * lvalue array: { T_ARRAY_LVALUE, array with lvalue pairs } 
 */ 
 
int lvalue_to_svalue_no_free(struct svalue *to, struct svalue *lval) 
{ 
  int run_time_type; 
  switch(run_time_type = TYPEOF(*lval)) 
  { 
   case T_ARRAY_LVALUE: 
    { 
      INT32 e; 
      struct array *a; 
      TYPE_FIELD types = 0; 
      ONERROR err; 
      a=allocate_array(lval[1].u.array->size>>1); 
      SET_ONERROR(err, do_free_array, a); 
      for(e=0;e<a->size;e++) { 
        lvalue_to_svalue_no_free(ITEM(a)+e, ITEM(lval[1].u.array)+(e<<1)); 
        types |= 1 << TYPEOF(ITEM(a)[e]); 
      } 
      a->type_field = types; 
      SET_SVAL(*to, T_ARRAY, 0, array, a); 
      UNSET_ONERROR(err); 
      break; 
    } 
 
    case T_SVALUE_PTR: 
      dmalloc_touch_svalue(lval->u.lval); 
      assign_svalue_no_free(to, lval->u.lval); 
      break; 
 
    case T_OBJECT: 
      /* FIXME: Index subtypes! */ 
      if (TYPEOF(lval[1]) == T_OBJ_INDEX) 
        run_time_type = low_object_index_no_free(to, lval->u.object, 
                                                 lval[1].u.identifier); 
      else 
        run_time_type = object_index_no_free(to, lval->u.object, 
                                             SUBTYPEOF(*lval), lval+1); 
      break; 
 
    case T_ARRAY: 
      simple_array_index_no_free(to, lval->u.array, lval+1); 
      break; 
 
    case T_MAPPING: 
      mapping_index_no_free(to, lval->u.mapping, lval+1); 
      break; 
 
    case T_MULTISET: 
      if(multiset_member(lval->u.multiset,lval+1)) 
      { 
        SET_SVAL(*to, T_INT, NUMBER_NUMBER, integer, 1); 
      }else{ 
        SET_SVAL(*to, T_INT, NUMBER_UNDEFINED, integer, 0); 
      } 
      break; 
 
    default: 
      if(SAFE_IS_ZERO(lval)) 
        index_error(0,0,0,lval,lval+1,"Indexing the NULL value.\n"); 
      else 
        index_error(0,0,0,lval,lval+1,"Indexing a basic type.\n"); 
  } 
  return run_time_type; 
} 
 
PMOD_EXPORT void assign_lvalue(struct svalue *lval,struct svalue *from) 
{ 
  switch(TYPEOF(*lval)) 
  { 
    case T_ARRAY_LVALUE: 
    { 
      INT32 e; 
      if(TYPEOF(*from) != T_ARRAY) 
        Pike_error("Trying to assign combined lvalue from non-array.\n"); 
 
      if(from->u.array->size < (lval[1].u.array->size>>1)) 
        Pike_error("Not enough values for multiple assign.\n"); 
 
      if(from->u.array->size > (lval[1].u.array->size>>1)) 
        Pike_error("Too many values for multiple assign.\n"); 
 
      for(e=0;e<from->u.array->size;e++) 
        assign_lvalue(lval[1].u.array->item+(e<<1),from->u.array->item+e); 
    } 
    break; 
 
  case T_SVALUE_PTR: 
    dmalloc_touch_svalue(from); 
    dmalloc_touch_svalue(lval->u.lval); 
    assign_svalue(lval->u.lval,from); 
    break; 
 
  case T_OBJECT: 
    /* FIXME: Object subtypes! */ 
    if (TYPEOF(lval[1]) == T_OBJ_INDEX) 
      object_low_set_index (lval->u.object, lval[1].u.identifier, from); 
    else 
      object_set_index(lval->u.object, SUBTYPEOF(*lval), lval+1, from); 
    break; 
 
  case T_ARRAY: 
    simple_set_index(lval->u.array, lval+1, from); 
    break; 
 
  case T_MAPPING: 
    mapping_insert(lval->u.mapping, lval+1, from); 
    break; 
 
  case T_MULTISET: 
    if(UNSAFE_IS_ZERO(from)) 
      multiset_delete(lval->u.multiset, lval+1); 
    else 
      multiset_insert(lval->u.multiset, lval+1); 
    break; 
 
  default: 
   if(SAFE_IS_ZERO(lval)) 
     index_error(0,0,0,lval,lval+1,"Indexing the NULL value.\n"); 
   else 
     index_error(0,0,0,lval,lval+1,"Indexing a basic type.\n"); 
  } 
} 
 
/* On error callback. lvalue is followed by value to assign. */ 
static void o_assign_lvalue(struct svalue *lvalue) 
{ 
  assign_lvalue(lvalue, lvalue+2); 
} 
 
union anything *get_pointer_if_this_type(struct svalue *lval, TYPE_T t) 
{ 
  switch(TYPEOF(*lval)) 
  { 
    case T_ARRAY_LVALUE: 
      return 0; 
 
    case T_SVALUE_PTR: 
      dmalloc_touch_svalue(lval->u.lval); 
      if(TYPEOF(*(lval->u.lval)) == t) return & ( lval->u.lval->u ); 
      return 0; 
 
    case T_OBJECT: 
      /* FIXME: What about object subtypes? */ 
      return object_get_item_ptr(lval->u.object, SUBTYPEOF(*lval), lval+1, t); 
 
    case T_ARRAY: 
      return array_get_item_ptr(lval->u.array,lval+1,t); 
 
    case T_MAPPING: 
      return mapping_get_item_ptr(lval->u.mapping,lval+1,t); 
 
    case T_MULTISET: return 0; 
 
    default: 
      if(SAFE_IS_ZERO(lval)) 
        index_error(0,0,0,lval,lval+1,"Indexing the NULL value.\n"); 
      else 
        index_error(0,0,0,lval,lval+1,"Indexing a basic type.\n"); 
      return 0; 
  } 
} 
 
#ifdef PIKE_DEBUG 
 
static inline void pike_trace(int level,char *fmt, ...) ATTRIBUTE((format (printf, 2, 3))); 
static inline void pike_trace(int level,char *fmt, ...) 
{ 
  if(Pike_interpreter.trace_level > level) 
  { 
    va_list args; 
    va_start(args,fmt); 
    vsprintf(trace_buffer,fmt,args); 
    va_end(args); 
    write_to_stderr(trace_buffer,strlen(trace_buffer)); 
  } 
} 
 
void my_describe_inherit_structure(struct program *p) 
{ 
  struct inherit *in,*last=0; 
  int e,i=0; 
  last=p->inherits-1; 
 
  fprintf(stderr,"PROGRAM[%d]: inherits=%d identifers_refs=%d ppid=%d\n", 
          p->id, 
          p->num_inherits, 
          p->num_identifier_references, 
          p->parent ? p->parent->id : -1); 
  for(e=0;e<p->num_identifier_references;e++) 
  { 
    in=INHERIT_FROM_INT(p,e); 
    while(last < in) 
    { 
      last++; 
      fprintf(stderr, 
              "[%ld]%*s parent{ offset=%d ident=%d id=%d } " 
              "id{ level=%d } prog=%d\n", 
              (long)(last - p->inherits), 
              last->inherit_level*2,"", 
              last->parent_offset, 
              last->parent_identifier, 
              last->prog->parent ? last->prog->parent->id : -1, 
              last->identifier_level, 
              last->prog->id); 
      i=0; 
    } 
 
    fprintf(stderr,"   %*s %d,%d: %s\n", 
              in->inherit_level*2,"", 
              e,i, 
            ID_FROM_INT(p,e)->name->str); 
    i++; 
  } 
} 
 
#define TRACE(X) pike_trace X 
#else 
#define TRACE(X) 
#endif 
 
static struct inherit dummy_inherit 
#ifdef PIKE_DEBUG 
  = {-4711, -4711, -4711, -4711, (size_t) -4711, -4711, NULL, NULL, NULL} 
#endif 
; 
 
/* Find the lexical scope @[depth] levels out. 
 * 
 * @[loc]: 
 *   Input: 
 *     struct object *o         // object to start from. 
 *     struct inherit *inherit  // inherit in o->prog. 
 *    (int parent_identifier)   // identifier in o to start from. 
 *                              // Only if depth == 0. 
 * 
 *   Output: 
 *     struct object *o         // object containing the scope. 
 *     struct inherit *inherit  // inherit in o->prog being the scope. 
 *     int parent_identifier    // identifier in o from the inherit. 
 */ 
PMOD_EXPORT void find_external_context(struct external_variable_context *loc, 
                                       int depth) 
{ 
  struct program *p; 
 
  TRACE((4, "-find_external_context(%d, inherit=%ld)\n", depth, 
         (long)(loc->o->prog ? loc->inherit - loc->o->prog->inherits : 0))); 
 
#ifdef PIKE_DEBUG 
  if(!loc->o) 
    Pike_fatal("No object\n"); 
#endif 
 
  if (!(p = loc->o->prog)) { 
    /* magic fallback */ 
    p = get_program_for_object_being_destructed(loc->o); 
    if(!p) 
    { 
      Pike_error("Cannot access parent of destructed object.\n"); 
    } 
  } 
 
#ifdef DEBUG_MALLOC 
  if (loc->o->refs == 0x55555555) { 
    fprintf(stderr, "The object %p has been zapped!\n", loc->o); 
    describe(p); 
    Pike_fatal("Object zapping detected.\n"); 
  } 
  if (p && p->refs == 0x55555555) { 
    fprintf(stderr, "The program %p has been zapped!\n", p); 
    describe(p); 
    fprintf(stderr, "Which taken from the object %p\n", loc->o); 
    describe(loc->o); 
    Pike_fatal("Looks like the program %p has been zapped!\n", p); 
  } 
#endif /* DEBUG_MALLOC */ 
 
  while(--depth>=0) 
  { 
    struct inherit *inh = loc->inherit; 
 
    if (!p) 
      Pike_error("Attempting to access parent of destructed object.\n"); 
 
#ifdef PIKE_DEBUG 
    if(Pike_interpreter.trace_level>8) 
      my_describe_inherit_structure(p); 
#endif 
 
    TRACE((4,"-   i->parent_offset=%d i->parent_identifier=%d\n", 
           inh->parent_offset, 
           inh->parent_identifier)); 
 
    TRACE((4,"-   o->parent_identifier=%d inherit->identifier_level=%d\n", 
           (p->flags & PROGRAM_USES_PARENT) ? 
           LOW_PARENT_INFO(loc->o, p)->parent_identifier : -1, 
           inh->identifier_level)); 
 
    switch(inh->parent_offset) 
    { 
      default: 
        { 
          /* Find the program that inherited us. */ 
          int my_level = inh->inherit_level; 
#ifdef PIKE_DEBUG 
          if(!my_level) 
            Pike_fatal("Gahhh! inherit level zero in wrong place!\n"); 
#endif 
          while(loc->inherit->inherit_level >= my_level) 
          { 
            TRACE((5,"-   inherit-- (%d >= %d)\n", 
                   loc->inherit->inherit_level, my_level)); 
            loc->inherit--; 
            TRACE((5, "-   identifier_level: %d\n", 
                   loc->inherit->identifier_level)); 
          } 
 
          find_external_context(loc, inh->parent_offset); 
          TRACE((5, 
                 "-    inh->parent_identifier: %d\n" 
                 "-    inh->identifier_level: %d\n" 
                 "-    loc->parent_identifier: %d\n" 
                 "-    loc->inherit->parent_offset: %d\n" 
                 "-    loc->inherit->identifier_level: %d\n", 
                 inh->parent_identifier, 
                 inh->identifier_level, 
                 loc->parent_identifier, 
                 loc->inherit->parent_offset, 
                 loc->inherit->identifier_level)); 
 
          loc->parent_identifier = 
            inh->parent_identifier + 
            loc->inherit->identifier_level; 
          TRACE((5, "-    parent_identifier: %d\n", loc->parent_identifier)); 
        } 
        break; 
 
      case INHERIT_PARENT: 
        TRACE((5,"-   Following inherit->parent\n")); 
        loc->parent_identifier=inh->parent_identifier; 
        loc->o=inh->parent; 
#ifdef PIKE_DEBUG 
        TRACE((5, "-   parent_identifier: %d\n" 
               "-   o: %p\n" 
               "-   inh: %"PRINTPTRDIFFT"d\n", 
               loc->parent_identifier, 
               loc->o, 
               loc->inherit - loc->o->prog->inherits)); 
        if(Pike_interpreter.trace_level>5) { 
          dump_program_tables(loc->o->prog, 4); 
        } 
#endif 
        break; 
 
      case OBJECT_PARENT: 
        TRACE((5,"-   Following o->parent\n")); 
 
#ifdef PIKE_DEBUG 
        /* Can this happen legitimately? Well, someone will hopefully 
         * let me know in that case. /mast */ 
        if (!(p->flags & PROGRAM_USES_PARENT)) 
          Pike_fatal ("Attempting to access parent of object without parent pointer.\n"); 
#endif 
 
        loc->parent_identifier=LOW_PARENT_INFO(loc->o,p)->parent_identifier; 
        loc->o=LOW_PARENT_INFO(loc->o,p)->parent; 
#ifdef PIKE_DEBUG 
        TRACE((5, "-   parent_identifier: %d\n" 
               "-   o: %p\n", 
               loc->parent_identifier, 
               loc->o)); 
        if(Pike_interpreter.trace_level>5) { 
          dump_program_tables(loc->o->prog, 4); 
        } 
#endif 
        break; 
    } 
 
#ifdef PIKE_DEBUG 
    /* I don't think this should happen either. The gc doesn't zap the 
     * pointer even if the object is destructed, at least. /mast */ 
    if (!loc->o) Pike_fatal ("No parent object.\n"); 
#endif 
 
    p = loc->o->prog; 
 
#ifdef DEBUG_MALLOC 
    if (loc->o->refs == 0x55555555) { 
      fprintf(stderr, "The object %p has been zapped!\n", loc->o); 
      describe(p); 
      Pike_fatal("Object zapping detected.\n"); 
    } 
    if (p && p->refs == 0x55555555) { 
      fprintf(stderr, "The program %p has been zapped!\n", p); 
      describe(p); 
      fprintf(stderr, "Which taken from the object %p\n", loc->o); 
      describe(loc->o); 
      Pike_fatal("Looks like the program %p has been zapped!\n", p); 
    } 
#endif /* DEBUG_MALLOC */ 
 
    if (p) { 
#ifdef PIKE_DEBUG 
      if(loc->parent_identifier < 0 || 
         loc->parent_identifier > p->num_identifier_references) 
        Pike_fatal("Identifier out of range, loc->parent_identifer=%d!\n", 
                   loc->parent_identifier); 
#endif 
      loc->inherit=INHERIT_FROM_INT(p, loc->parent_identifier); 
      TRACE((5, "-   loc->inherit: %"PRINTPTRDIFFT"d\n", 
             loc->inherit - loc->o->prog->inherits)); 
    } 
    else 
      /* Return a valid pointer to a dummy inherit for the convenience 
       * of the caller. Identifier offsets will be bogus but it'll 
       * never get to that since the object is destructed. */ 
      loc->inherit = &dummy_inherit; 
 
    TRACE((5,"-   Parent identifier = %d (%s), inherit # = %ld\n", 
           loc->parent_identifier, 
           p ? ID_FROM_INT(p, loc->parent_identifier)->name->str : "N/A", 
           p ? (long)(loc->inherit - p->inherits) : -1)); 
 
#ifdef DEBUG_MALLOC 
    if (p && loc->inherit->storage_offset == 0x55555555) { 
      fprintf(stderr, "The inherit %p has been zapped!\n", loc->inherit); 
      debug_malloc_dump_references(loc->inherit,0,2,0); 
      fprintf(stderr, "It was extracted from the program %p %d\n", p, loc->parent_identifier); 
      describe(p); 
      fprintf(stderr, "Which was in turn taken from the object %p\n", loc->o); 
      describe(loc->o); 
      Pike_fatal("Looks like the program %p has been zapped!\n", p); 
    } 
#endif /* DEBUG_MALLOC */ 
  } 
 
  TRACE((4,"--find_external_context: parent_id=%d (%s)\n", 
         loc->parent_identifier, 
         p ? ID_FROM_INT(p,loc->parent_identifier)->name->str : "N/A" 
         )); 
} 
 
#ifdef PIKE_DEBUG 
void print_return_value(void) 
{ 
  if(Pike_interpreter.trace_level>3) 
  { 
    struct byte_buffer buf = BUFFER_INIT(); 
 
    safe_describe_svalue(&buf, Pike_sp-1,0,0); 
    if(buffer_content_length(&buf) > TRACE_LEN) 
    { 
      buffer_remove(&buf, buffer_content_length(&buf) - TRACE_LEN); 
      buffer_add_str(&buf, "..."); 
    } 
    fprintf(stderr,"-    value: %s\n",buffer_get_string(&buf)); 
    buffer_free(&buf); 
  } 
} 
#else 
#define print_return_value() 
#endif 
 
struct callback_list evaluator_callbacks; 
 
 
/* 
 * reset the stack machine. 
 */ 
void reset_evaluator(void) 
{ 
  Pike_fp=0; 
  pop_n_elems(Pike_sp - Pike_interpreter.evaluator_stack); 
 
#ifdef PIKE_DEBUG 
  if (Pike_interpreter.catch_ctx) 
    Pike_fatal ("Catch context spillover.\n"); 
  if (Pike_interpreter.catching_eval_jmpbuf) 
    Pike_fatal ("Got an active catching_eval_jmpbuf.\n"); 
#endif 
} 
 
#ifdef PIKE_DEBUG 
 
#define BACKLOG 100 
struct backlog 
{ 
  PIKE_INSTR_T instruction; 
  INT32 arg,arg2; 
  INT32 program_id; 
  PIKE_OPCODE_T *pc; 
#ifdef _REENTRANT 
  struct thread_state *thread_state; 
#endif 
  ptrdiff_t stack; 
  ptrdiff_t mark_stack; 
}; 
 
struct backlog backlog[BACKLOG]; 
int backlogp=BACKLOG-1; 
 
static inline void low_debug_instr_prologue (PIKE_INSTR_T instr) 
{ 
  if(Pike_interpreter.trace_level > 2) 
  { 
    char *file = NULL, *f; 
    struct pike_string *filep; 
    INT_TYPE linep; 
 
    filep = get_line(Pike_fp->pc,Pike_fp->context->prog,&linep); 
    if (filep && !filep->size_shift) { 
      file = filep->str; 
      while((f=strchr(file,'/'))) 
        file=f+1; 
    } 
    fprintf(stderr,"- %s:%4ld:%p(%"PRINTPTRDIFFT"d): " 
            "%-25s %4"PRINTPTRDIFFT"d %4"PRINTPTRDIFFT"d\n", 
            file ? file : "-",(long)linep, 
            Pike_fp->pc, Pike_fp->pc - Pike_fp->context->prog->program, 
            get_opcode_name(instr), 
            Pike_sp-Pike_interpreter.evaluator_stack, 
            Pike_mark_sp-Pike_interpreter.mark_stack); 
    free_string(filep); 
  } 
 
#ifdef HAVE_COMPUTED_GOTO 
  if (instr) 
    ADD_RUNNED(instr); 
  else 
    Pike_fatal("NULL Instruction!\n"); 
#else /* !HAVE_COMPUTED_GOTO */ 
  if(instr + F_OFFSET < F_MAX_OPCODE) 
    ADD_RUNNED(instr); 
#endif /* HAVE_COMPUTED_GOTO */ 
 
  if(d_flag ) 
  { 
    backlogp++; 
    if(backlogp >= BACKLOG) backlogp=0; 
 
    backlog[backlogp].program_id = Pike_fp->context->prog->id; 
    backlog[backlogp].instruction=instr; 
    backlog[backlogp].pc = Pike_fp->pc; 
    backlog[backlogp].stack = Pike_sp - Pike_interpreter.evaluator_stack; 
    backlog[backlogp].mark_stack = Pike_mark_sp - Pike_interpreter.mark_stack; 
#ifdef _REENTRANT 
    backlog[backlogp].thread_state=Pike_interpreter.thread_state; 
#endif 
 
#ifdef _REENTRANT 
    CHECK_INTERPRETER_LOCK(); 
    if(d_flag>1) DEBUG_CHECK_THREAD(); 
#endif 
 
    INVALIDATE_SVAL(Pike_sp[0]); 
    INVALIDATE_SVAL(Pike_sp[1]); 
    INVALIDATE_SVAL(Pike_sp[2]); 
    INVALIDATE_SVAL(Pike_sp[3]); 
 
    if(Pike_sp<Pike_interpreter.evaluator_stack || 
       Pike_mark_sp < Pike_interpreter.mark_stack || Pike_fp->locals>Pike_sp) 
      Pike_fatal("Stack error (generic) sp=%p/%p mark_sp=%p/%p locals=%p.\n", 
                 Pike_sp, 
                 Pike_interpreter.evaluator_stack, 
                 Pike_mark_sp, 
                 Pike_interpreter.mark_stack, 
                 Pike_fp->locals); 
 
    if(Pike_mark_sp > Pike_interpreter.mark_stack+Pike_stack_size) 
      Pike_fatal("Mark Stack error (overflow).\n"); 
 
 
    if(Pike_mark_sp < Pike_interpreter.mark_stack) 
      Pike_fatal("Mark Stack error (underflow).\n"); 
 
    if(Pike_sp > Pike_interpreter.evaluator_stack+Pike_stack_size) 
      Pike_fatal("stack error (overflow).\n"); 
 
 
    /* The locals will not be correct when running FILL_STACK 
       (actually, they will always be incorrect before running FILL_STACK, 
       but at least currently that is the first opcode run). 
    */ 
 
    /* as it turns out, this is no longer true.. */ 
    /* if( instr+F_OFFSET != F_FILL_STACK ) */ 
    /* { */ 
    /*     if(/\* Pike_fp->fun>=0 && *\/ Pike_fp->current_object->prog && */ 
    /*        Pike_fp->locals+Pike_fp->num_locals > Pike_sp) */ 
    /*         Pike_fatal("Stack error (stupid! %p %p+%x).\n",Pike_sp, */ 
    /*                    Pike_fp->locals, Pike_fp->num_locals*sizeof(struct svalue)); */ 
    /* } */ 
 
    if(Pike_interpreter.recoveries && 
       (Pike_sp-Pike_interpreter.evaluator_stack < 
        Pike_interpreter.recoveries->stack_pointer)) 
      Pike_fatal("Stack error (underflow).\n"); 
 
    if(Pike_mark_sp > Pike_interpreter.mark_stack && 
       Pike_mark_sp[-1] > Pike_sp) 
      Pike_fatal("Stack error (underflow?)\n"); 
 
    if(d_flag > 9) do_debug(); 
 
    debug_malloc_touch(Pike_fp->current_object); 
    switch(d_flag) 
    { 
      default: 
      case 3: 
        check_object(Pike_fp->current_object); 
        /*      break; */ 
 
      case 2: 
        check_object_context(Pike_fp->current_object, 
                             Pike_fp->context->prog, 
                             Pike_fp->current_object->storage+ 
                             Pike_fp->context->storage_offset); 
      case 1: 
      case 0: 
        break; 
    } 
  } 
} 
 
#define DEBUG_LOG_ARG(ARG)                                    \ 
  (backlog[backlogp].arg = (ARG),                               \ 
   (Pike_interpreter.trace_level>3 ?                            \ 
    sprintf(trace_buffer, "-    Arg = %ld\n",                   \ 
            (long) backlog[backlogp].arg),                      \ 
    write_to_stderr(trace_buffer,strlen(trace_buffer)) : 0)) 
 
#define DEBUG_LOG_ARG2(ARG2)                                  \ 
  (backlog[backlogp].arg2 = (ARG2),                             \ 
   (Pike_interpreter.trace_level>3 ?                            \ 
    sprintf(trace_buffer, "-    Arg2 = %ld\n",                  \ 
            (long) backlog[backlogp].arg2),                     \ 
    write_to_stderr(trace_buffer,strlen(trace_buffer)) : 0)) 
 
PMOD_EXPORT void dump_backlog(void) 
{ 
#ifdef _REENTRANT 
  struct thread_state *thread=0; 
#endif 
 
  int e; 
  if(!d_flag || backlogp<0 || backlogp>=BACKLOG) 
    return; 
 
  e=backlogp; 
  do 
  { 
    struct program *p; 
    e++; 
    if(e>=BACKLOG) e=0; 
 
    p = id_to_program (backlog[e].program_id); 
    if (p) 
    { 
      struct pike_string *file; 
      INT_TYPE line; 
 
#ifdef _REENTRANT 
      if(thread != backlog[e].thread_state) 
      { 
        fprintf(stderr,"[Thread swap, Pike_interpreter.thread_state=%p]\n",backlog[e].thread_state); 
        thread = backlog[e].thread_state; 
      } 
#endif 
 
      file = get_line(backlog[e].pc,p, &line); 
#ifdef HAVE_COMPUTED_GOTO 
      fprintf(stderr,"%s:%ld:(%"PRINTPTRDIFFT"d): %s", 
              file->str, 
              (long)line, 
              backlog[e].pc - p->program, 
              get_opcode_name(backlog[e].instruction)); 
#else /* !HAVE_COMPUTED_GOTO */ 
      if(backlog[e].instruction+F_OFFSET > F_MAX_OPCODE) 
      { 
        fprintf(stderr,"%s:%ld:(%"PRINTPTRDIFFT"d): ILLEGAL INSTRUCTION %d\n", 
                file->str, 
                (long)line, 
                backlog[e].pc - p->program, 
                backlog[e].instruction + F_OFFSET); 
        free_string(file); 
        continue; 
      } 
 
      fprintf(stderr,"%s:%ld:(%"PRINTPTRDIFFT"d): %s", 
              file->str, 
              (long)line, 
              backlog[e].pc - p->program, 
              low_get_f_name(backlog[e].instruction + F_OFFSET, p)); 
      if(instrs[backlog[e].instruction].flags & I_HASARG2) 
      { 
        fprintf(stderr,"(%ld,%ld)", 
                (long)backlog[e].arg, 
                (long)backlog[e].arg2); 
      } 
      else if(instrs[backlog[e].instruction].flags & I_POINTER) 
      { 
        fprintf(stderr,"(%+ld)", (long)backlog[e].arg); 
      } 
      else if(instrs[backlog[e].instruction].flags & I_HASARG) 
      { 
        fprintf(stderr,"(%ld)", (long)backlog[e].arg); 
      } 
      fprintf(stderr," %ld, %ld\n", (long)backlog[e].stack, 
              (long)backlog[e].mark_stack); 
#endif /* HAVE_COMPUTED_GOTO */ 
      free_string(file); 
    } 
  }while(e!=backlogp); 
} 
 
#else  /* PIKE_DEBUG */ 
 
#define DEBUG_LOG_ARG(arg) 0 
#define DEBUG_LOG_ARG2(arg2) 0 
 
#endif        /* !PIKE_DEBUG */ 
 
 
#define POP_CATCH_CONTEXT do {                                         \ 
    struct catch_context *cc = Pike_interpreter.catch_ctx;             \ 
    DO_IF_DEBUG (                                                      \ 
      TRACE((3,"-   Popping catch context %p ==> %p\n",                        \ 
            cc, cc ? cc->prev : NULL));                                \ 
      if (!Pike_interpreter.catching_eval_jmpbuf)                      \ 
       Pike_fatal ("Not in catching eval.\n");                         \ 
      if (!cc)                                                         \ 
       Pike_fatal ("Catch context dropoff.\n");                        \ 
      if (cc->frame != Pike_fp)                                                \ 
       Pike_fatal ("Catch context doesn't belong to this frame.\n");   \ 
      if (Pike_mark_sp != cc->recovery.mark_sp + Pike_interpreter.mark_stack) \ 
       Pike_fatal ("Mark sp diff in catch context pop.\n");            \ 
    );                                                                 \ 
    debug_malloc_touch (cc);                                           \ 
    UNSETJMP (cc->recovery);                                           \ 
    frame_set_expendible(Pike_fp, cc->save_expendible);                \ 
    Pike_interpreter.catch_ctx = cc->prev;                             \ 
    really_free_catch_context (cc);                                    \ 
  } while (0) 
 
static struct catch_context *free_catch_context; 
static int num_catch_ctx, num_free_catch_ctx; 
 
PMOD_EXPORT void really_free_catch_context( struct catch_context *data ) 
{ 
    if( num_free_catch_ctx > 100 && free_catch_context ) 
    { 
      num_catch_ctx--; 
      free( data ); 
    } 
    else 
    { 
      data->prev = free_catch_context; 
 
      num_free_catch_ctx++; 
      PIKE_MEM_NA(*data); 
      PIKE_MEM_RW(data->prev); 
      free_catch_context = data; 
    } 
} 
 
struct catch_context *alloc_catch_context(void) 
{ 
    struct catch_context *res; 
    if( free_catch_context ) 
    { 
        num_free_catch_ctx--; 
        res = free_catch_context; 
        PIKE_MEM_RW(res->prev); 
        free_catch_context = res->prev; 
        PIKE_MEM_WO(*res); 
    } 
    else 
    { 
        num_catch_ctx++; 
        res = xalloc( sizeof( struct catch_context ) ); 
    } 
    return res; 
} 
 
void count_memory_in_catch_contexts(size_t *num, size_t *size ) 
{ 
  *num = (num_catch_ctx-num_free_catch_ctx); 
  *size = num_catch_ctx * (sizeof(struct catch_context)+8); /* assumes 8 bytes overhead. */ 
} 
 
#ifdef DO_PIKE_CLEANUP 
static void free_all_catch_context_blocks(void) 
{ 
    struct catch_context *x = free_catch_context, *n; 
    while( x ) 
    { 
        PIKE_MEM_RW(x->prev); 
        n = x->prev; 
        free( x ); 
        x = n; 
    } 
    free_catch_context = NULL; 
} 
#endif 
 
static int catching_eval_instruction (PIKE_OPCODE_T *pc); 
 
 
#ifdef PIKE_USE_MACHINE_CODE 
#ifdef OPCODE_INLINE_RETURN 
/* Catch notes: 
 * 
 * Typical F_CATCH use: 
 * 
 *   F_CATCH 
 *      F_PTR   continue_label 
 * 
 *   ENTRY 
 * 
 *   catch body 
 * 
 *   F_EXIT_CATCH 
 * 
 *   F_BRANCH 
 *      F_PTR   continue_label 
 * 
 *   ENTRY 
 * 
 * continue_label: 
 * 
 *   rest of code. 
 */ 
 
/* Modified calling-conventions to simplify code-generation when 
 * INTER_RETURN is inlined. 
 * 
 * cf interpret_functions.h:F_CATCH 
 * 
 * Arguments: 
 *   addr: 
 *     Address where the continue POINTER (INT32) is stored. 
 *     Directly after the POINTER is the ENTRY for the catch block. 
 * 
 * Returns: 
 *   (PIKE_OPCODE_T *)-1 on INTER_RETURN. 
 *   jump_destination otherwise. 
 */ 
PIKE_OPCODE_T *inter_return_opcode_F_CATCH(PIKE_OPCODE_T *addr) 
{ 
#ifdef PIKE_DEBUG 
  if (d_flag || Pike_interpreter.trace_level > 2) { 
    low_debug_instr_prologue (F_CATCH - F_OFFSET); 
    if (Pike_interpreter.trace_level>3) { 
      sprintf(trace_buffer, "-    Addr = %p\n", addr); 
      write_to_stderr(trace_buffer,strlen(trace_buffer)); 
    } 
  } 
#endif 
  { 
    struct catch_context *new_catch_ctx = alloc_catch_context(); 
#ifdef PIKE_DEBUG 
      new_catch_ctx->frame = Pike_fp; 
      init_recovery (&new_catch_ctx->recovery, 0, 0, PERR_LOCATION()); 
#else 
      init_recovery (&new_catch_ctx->recovery, 0); 
#endif 
    new_catch_ctx->save_expendible = frame_get_expendible(Pike_fp); 
    new_catch_ctx->continue_reladdr = (INT32)get_unaligned32(addr) 
      /* We need to run the entry prologue... */ 
      - ENTRY_PROLOGUE_SIZE; 
 
    new_catch_ctx->next_addr = addr; 
    new_catch_ctx->prev = Pike_interpreter.catch_ctx; 
    Pike_interpreter.catch_ctx = new_catch_ctx; 
    DO_IF_DEBUG({ 
        TRACE((3,"-   Pushed catch context %p\n", new_catch_ctx)); 
      }); 
  } 
 
  Pike_fp->expendible_offset = Pike_fp->num_locals; 
 
  /* Need to adjust next_addr by sizeof(INT32) to skip past the jump 
   * address to the continue position after the catch block. */ 
  addr = (PIKE_OPCODE_T *) ((INT32 *) addr + 1); 
 
  if (Pike_interpreter.catching_eval_jmpbuf) { 
    /* There's already a catching_eval_instruction around our 
     * eval_instruction, so we can just continue. */ 
    debug_malloc_touch_named (Pike_interpreter.catch_ctx, "(1)"); 
    /* Skip past the entry prologue... */ 
    addr += ENTRY_PROLOGUE_SIZE; 
    DO_IF_DEBUG({ 
        TRACE((3,"-   In active catch; continuing at %p\n", addr)); 
      }); 
    return addr; 
  } 
  else { 
    debug_malloc_touch_named (Pike_interpreter.catch_ctx, "(2)"); 
 
    while (1) { 
      /* Loop here every time an exception is caught. Once we've 
       * gotten here and set things up to run eval_instruction from 
       * inside catching_eval_instruction, we keep doing it until it's 
       * time to return. */ 
 
      int res; 
 
      DO_IF_DEBUG({ 
          TRACE((3,"-   Activating catch; calling %p in context %p\n", 
                 addr, Pike_interpreter.catch_ctx)); 
        }); 
 
      res = catching_eval_instruction (addr); 
 
      DO_IF_DEBUG({ 
          TRACE((3,"-   catching_eval_instruction(%p) returned %d\n", 
                 addr, res)); 
        }); 
 
      if (res != -3) { 
        /* There was an inter return inside the evaluated code. Just 
         * propagate it. */ 
        DO_IF_DEBUG ({ 
            TRACE((3,"-   Returning from catch.\n")); 
            if (res != -1) Pike_fatal ("Unexpected return value from " 
                                       "catching_eval_instruction: %d\n", res); 
          }); 
        break; 
      } 
 
      else { 
        /* Caught an exception. */ 
        struct catch_context *cc = Pike_interpreter.catch_ctx; 
 
        DO_IF_DEBUG ({ 
            TRACE((3,"-   Caught exception. catch context: %p\n", cc)); 
            if (!cc) Pike_fatal ("Catch context dropoff.\n"); 
            if (cc->frame != Pike_fp) 
              Pike_fatal ("Catch context doesn't belong to this frame.\n"); 
          }); 
 
        debug_malloc_touch_named (cc, "(3)"); 
        UNSETJMP (cc->recovery); 
        frame_set_expendible(Pike_fp, cc->save_expendible); 
        move_svalue (Pike_sp++, &throw_value); 
        mark_free_svalue (&throw_value); 
        low_destruct_objects_to_destruct(); 
 
        if (cc->continue_reladdr < 0) 
          FAST_CHECK_THREADS_ON_BRANCH(); 
        addr = cc->next_addr + cc->continue_reladdr; 
 
        DO_IF_DEBUG({ 
            TRACE((3,"-   Popping catch context %p ==> %p\n", 
                   cc, cc->prev)); 
            if (!addr) Pike_fatal ("Unexpected null continue addr.\n"); 
          }); 
 
        Pike_interpreter.catch_ctx = cc->prev; 
        really_free_catch_context (cc); 
      } 
    } 
 
    return (PIKE_OPCODE_T *)(ptrdiff_t)-1;  /* INTER_RETURN; */ 
  } 
} 
 
void *do_inter_return_label = (void*)(ptrdiff_t)-1; 
#else 
/* Labels to jump to to cause eval_instruction to return */ 
/* FIXME: Replace these with assembler lables */ 
void *do_inter_return_label = NULL; 
void *dummy_label = NULL; 
#endif 
 
#ifndef CALL_MACHINE_CODE 
#define CALL_MACHINE_CODE(pc)                                 \ 
  do {                                                          \ 
    /* The test is needed to get the labels to work... */       \ 
    if (pc) {                                                   \ 
      /* No extra setup needed!                                 \ 
       */                                                       \ 
      return ((int (*)(void))(pc))();                           \ 
    }                                                           \ 
  } while(0) 
#endif /* !CALL_MACHINE_CODE */ 
 
#ifndef EXIT_MACHINE_CODE 
#define EXIT_MACHINE_CODE() 
#endif 
 
/* Intended to be called from machine code before inlined function 
 * calls (primarily the CALL_BUILTIN opcodes), to ensure thread 
 * switching. */ 
void call_check_threads_etc(void) 
{ 
  FAST_CHECK_THREADS_ON_CALL(); 
} 
 
#if defined(OPCODE_INLINE_BRANCH) || defined(INS_F_JUMP) || \ 
    defined(INS_F_JUMP_WITH_ARG) || defined(INS_F_JUMP_WITH_TWO_ARGS) 
/* Intended to be called from machine code on backward branch jumps, 
 * to ensure thread switching. */ 
void branch_check_threads_etc(void) 
{ 
  FAST_CHECK_THREADS_ON_BRANCH(); 
} 
#endif 
 
#ifdef PIKE_DEBUG 
 
static void debug_instr_prologue (PIKE_INSTR_T instr) 
{ 
  low_debug_instr_prologue (instr); 
} 
 
#define DEBUG_PROLOGUE(OPCODE, EXTRA) do {                            \ 
    if (d_flag || Pike_interpreter.trace_level > 2) {                   \ 
      debug_instr_prologue ((OPCODE) - F_OFFSET);                       \ 
      EXTRA;                                                            \ 
    }                                                                   \ 
  } while (0) 
 
/* The following are intended to be called directly from generated 
 * machine code. */ 
void simple_debug_instr_prologue_0 (PIKE_INSTR_T instr) 
{ 
  if (d_flag || Pike_interpreter.trace_level > 2) 
    low_debug_instr_prologue (instr); 
} 
void simple_debug_instr_prologue_1 (PIKE_INSTR_T instr, INT32 arg) 
{ 
  if (d_flag || Pike_interpreter.trace_level > 2) { 
    low_debug_instr_prologue (instr); 
    DEBUG_LOG_ARG (arg); 
  } 
} 
void simple_debug_instr_prologue_2 (PIKE_INSTR_T instr, INT32 arg1, INT32 arg2) 
{ 
  if (d_flag || Pike_interpreter.trace_level > 2) { 
    low_debug_instr_prologue (instr); 
    DEBUG_LOG_ARG (arg1); 
    DEBUG_LOG_ARG2 (arg2); 
  } 
} 
 
#endif        /* !PIKE_DEBUG */ 
 
#endif /* PIKE_USE_MACHINE_CODE */ 
 
/* These don't change when eval_instruction_without_debug is compiled. */ 
#ifdef PIKE_DEBUG 
#define REAL_PIKE_DEBUG 
#define DO_IF_REAL_DEBUG(X) X 
#define DO_IF_NOT_REAL_DEBUG(X) 
#else 
#define DO_IF_REAL_DEBUG(X) 
#define DO_IF_NOT_REAL_DEBUG(X) X 
#endif 
 
#ifdef PIKE_SMALL_EVAL_INSTRUCTION 
#undef PROG_COUNTER 
#define PROG_COUNTER  Pike_fp->pc+1 
#endif /* PIKE_SMALL_EVAL_INSTRUCTION */ 
 
#if defined(PIKE_USE_MACHINE_CODE) || defined(PIKE_SMALL_EVAL_INSTRUCTION) 
 
#ifndef DEF_PROG_COUNTER 
#define DEF_PROG_COUNTER 
#endif /* !DEF_PROG_COUNTER */ 
 
#ifndef DEBUG_PROLOGUE 
#define DEBUG_PROLOGUE(OPCODE, EXTRA) do {} while (0) 
#endif 
 
#define OPCODE0(O,N,F,C) \ 
void PIKE_CONCAT(opcode_,O)(void) { \ 
  DEF_PROG_COUNTER; \ 
  DEBUG_PROLOGUE (O, ;);                                                \ 
C } 
 
#define OPCODE1(O,N,F,C) \ 
void PIKE_CONCAT(opcode_,O)(INT32 arg1) {\ 
  DEF_PROG_COUNTER; \ 
  DEBUG_PROLOGUE (O, DEBUG_LOG_ARG (arg1));                             \ 
C } 
 
#define OPCODE2(O,N,F,C) \ 
void PIKE_CONCAT(opcode_,O)(INT32 arg1,INT32 arg2) { \ 
  DEF_PROG_COUNTER; \ 
  DEBUG_PROLOGUE (O, DEBUG_LOG_ARG (arg1); DEBUG_LOG_ARG2 (arg2));      \ 
C } 
 
#if defined(OPCODE_RETURN_JUMPADDR) || defined(PIKE_SMALL_EVAL_INSTRUCTION) 
 
#define OPCODE0_JUMP(O,N,F,C)                                         \ 
  void *PIKE_CONCAT(jump_opcode_,O)(void) {                             \ 
    void *jumpaddr DO_IF_DEBUG(= NULL);                                 \ 
    DEF_PROG_COUNTER;                                                   \ 
    DEBUG_PROLOGUE (O, ;);                                              \ 
    C;                                                                  \ 
    JUMP_DONE;                                                          \ 
  } 
 
#define OPCODE1_JUMP(O,N,F,C)                                         \ 
  void *PIKE_CONCAT(jump_opcode_,O)(INT32 arg1) {                       \ 
    void *jumpaddr DO_IF_DEBUG(= NULL);                                 \ 
    DEF_PROG_COUNTER;                                                   \ 
    DEBUG_PROLOGUE (O, DEBUG_LOG_ARG (arg1));                           \ 
    C;                                                                  \ 
    JUMP_DONE;                                                          \ 
  } 
 
#define OPCODE2_JUMP(O,N,F,C)                                         \ 
  void *PIKE_CONCAT(jump_opcode_,O)(INT32 arg1, INT32 arg2) {           \ 
    void *jumpaddr DO_IF_DEBUG(= NULL);                                 \ 
    DEF_PROG_COUNTER;                                                   \ 
    DEBUG_PROLOGUE (O, DEBUG_LOG_ARG (arg1); DEBUG_LOG_ARG2 (arg2));    \ 
    C;                                                                  \ 
    JUMP_DONE;                                                          \ 
  } 
 
#define SET_PROG_COUNTER(X) (jumpaddr = (X)) 
 
#ifdef PIKE_DEBUG 
#define JUMP_DONE do {                                                        \ 
    if (!jumpaddr)                                                      \ 
      Pike_fatal ("Instruction didn't set jump address.\n");            \ 
    return jumpaddr;                                                    \ 
  } while (0) 
#else 
#define JUMP_DONE return jumpaddr 
#endif 
 
#else  /* !OPCODE_RETURN_JUMPADDR && !PIKE_SMALL_EVAL_INSTRUCTION */ 
#define OPCODE0_JUMP OPCODE0 
#define OPCODE1_JUMP OPCODE1 
#define OPCODE2_JUMP OPCODE2 
#define JUMP_DONE DONE 
#endif        /* OPCODE_RETURN_JUMPADDR || PIKE_SMALL_EVAL_INSTRUCTION */ 
 
#if defined(OPCODE_INLINE_BRANCH) || defined(PIKE_SMALL_EVAL_INSTRUCTION) 
#define TEST_OPCODE0(O,N,F,C) \ 
ptrdiff_t PIKE_CONCAT(test_opcode_,O)(void) { \ 
    ptrdiff_t branch_taken = 0; \ 
    DEF_PROG_COUNTER; \ 
    DEBUG_PROLOGUE (O, ;);                                              \ 
    C; \ 
    return branch_taken; \ 
  } 
 
#define TEST_OPCODE1(O,N,F,C) \ 
ptrdiff_t PIKE_CONCAT(test_opcode_,O)(INT32 arg1) {\ 
    ptrdiff_t branch_taken = 0; \ 
    DEF_PROG_COUNTER; \ 
    DEBUG_PROLOGUE (O, DEBUG_LOG_ARG (arg1));                           \ 
    C; \ 
    return branch_taken; \ 
  } 
 
 
#define TEST_OPCODE2(O,N,F,C) \ 
ptrdiff_t PIKE_CONCAT(test_opcode_,O)(INT32 arg1, INT32 arg2) { \ 
    ptrdiff_t branch_taken = 0; \ 
    DEF_PROG_COUNTER; \ 
    DEBUG_PROLOGUE (O, DEBUG_LOG_ARG (arg1); DEBUG_LOG_ARG2 (arg2));    \ 
    C; \ 
    return branch_taken; \ 
  } 
 
#define DO_BRANCH()   (branch_taken = -1) 
#define DONT_BRANCH() (branch_taken = 0) 
#else /* !OPCODE_INLINE_BRANCH && !PIKE_SMALL_EVAL_INSTRUCTION */ 
#define TEST_OPCODE0(O,N,F,C) OPCODE0_PTRJUMP(O,N,F,C) 
#define TEST_OPCODE1(O,N,F,C) OPCODE1_PTRJUMP(O,N,F,C) 
#define TEST_OPCODE2(O,N,F,C) OPCODE2_PTRJUMP(O,N,F,C) 
#endif /* OPCODE_INLINE_BRANCH || PIKE_SMALL_EVAL_INSTRUCTION */ 
 
#define OPCODE0_TAIL(O,N,F,C) OPCODE0(O,N,F,C) 
#define OPCODE1_TAIL(O,N,F,C) OPCODE1(O,N,F,C) 
#define OPCODE2_TAIL(O,N,F,C) OPCODE2(O,N,F,C) 
 
#define OPCODE0_PTRJUMP(O,N,F,C) OPCODE0_JUMP(O,N,F,C) 
#define OPCODE1_PTRJUMP(O,N,F,C) OPCODE1_JUMP(O,N,F,C) 
#define OPCODE2_PTRJUMP(O,N,F,C) OPCODE2_JUMP(O,N,F,C) 
#define OPCODE0_TAILPTRJUMP(O,N,F,C) OPCODE0_PTRJUMP(O,N,F,C) 
#define OPCODE1_TAILPTRJUMP(O,N,F,C) OPCODE1_PTRJUMP(O,N,F,C) 
#define OPCODE2_TAILPTRJUMP(O,N,F,C) OPCODE2_PTRJUMP(O,N,F,C) 
 
#define OPCODE0_RETURN(O,N,F,C) OPCODE0_JUMP(O,N,F | I_RETURN,C) 
#define OPCODE1_RETURN(O,N,F,C) OPCODE1_JUMP(O,N,F | I_RETURN,C) 
#define OPCODE2_RETURN(O,N,F,C) OPCODE2_JUMP(O,N,F | I_RETURN,C) 
#define OPCODE0_TAILRETURN(O,N,F,C) OPCODE0_RETURN(O,N,F,C) 
#define OPCODE1_TAILRETURN(O,N,F,C) OPCODE1_RETURN(O,N,F,C) 
#define OPCODE2_TAILRETURN(O,N,F,C) OPCODE2_RETURN(O,N,F,C) 
 
/* BRANCH opcodes only generate code for the test, 
 * so that the branch instruction can be inlined. 
 */ 
#define OPCODE0_BRANCH(O,N,F,C) TEST_OPCODE0(O,N,F,C) 
#define OPCODE1_BRANCH(O,N,F,C) TEST_OPCODE1(O,N,F,C) 
#define OPCODE2_BRANCH(O,N,F,C) TEST_OPCODE2(O,N,F,C) 
#define OPCODE0_TAILBRANCH(O,N,F,C) TEST_OPCODE0(O,N,F,C) 
#define OPCODE1_TAILBRANCH(O,N,F,C) TEST_OPCODE1(O,N,F,C) 
#define OPCODE2_TAILBRANCH(O,N,F,C) TEST_OPCODE2(O,N,F,C) 
 
#define OPCODE0_ALIAS(O,N,F,C) 
#define OPCODE1_ALIAS(O,N,F,C) 
#define OPCODE2_ALIAS(O,N,F,C) 
 
#undef HAVE_COMPUTED_GOTO 
 
#ifdef GLOBAL_DEF_PROG_COUNTER 
GLOBAL_DEF_PROG_COUNTER; 
#endif 
 
#ifndef SET_PROG_COUNTER 
#define SET_PROG_COUNTER(X)   (PROG_COUNTER=(X)) 
#endif /* SET_PROG_COUNTER */ 
 
#undef DONE 
#undef FETCH 
#undef INTER_RETURN 
 
#define DONE return 
#define FETCH 
#define INTER_RETURN {SET_PROG_COUNTER(do_inter_return_label);JUMP_DONE;} 
 
#if defined(PIKE_USE_MACHINE_CODE) && defined(_M_IX86) 
/* Disable frame pointer optimization */ 
#pragma optimize("y", off) 
#endif 
 
#include "interpret_functions_fixed.h" 
 
#if defined(PIKE_USE_MACHINE_CODE) && defined(_M_IX86) 
/* Restore optimization */ 
#pragma optimize("", on) 
#endif 
 
#ifdef PIKE_SMALL_EVAL_INSTRUCTION 
#undef SET_PROG_COUNTER 
#undef PROG_COUNTER 
#define PROG_COUNTER  pc 
#endif 
 
#endif /* PIKE_USE_MACHINE_CODE || PIKE_SMALL_EVAL_INSTRUCTION */ 
 
#ifdef PIKE_USE_MACHINE_CODE 
 
#ifdef PIKE_DEBUG 
/* Note: The debug code is extracted, to keep the frame size constant. */ 
static int eval_instruction_low(PIKE_OPCODE_T *pc); 
#endif /* PIKE_DEBUG */ 
 
static int eval_instruction(PIKE_OPCODE_T *pc) 
#ifdef PIKE_DEBUG 
{ 
  int x; 
  if (Pike_interpreter.trace_level > 5 && pc) { 
    int i; 
    fprintf(stderr, "Calling code at %p:\n", pc); 
#ifdef PIKE_OPCODE_ALIGN 
    if (((INT32)pc) % PIKE_OPCODE_ALIGN) { 
      Pike_fatal("Odd offset!\n"); 
    } 
#endif /* PIKE_OPCODE_ALIGN */ 
#ifdef DISASSEMBLE_CODE 
    DISASSEMBLE_CODE(pc, 16*4); 
#else /* !DISASSEMBLE_CODE */ 
    for (i=0; i < 16; i+=4) { 
      fprintf(stderr, 
              "  0x%08x 0x%08x 0x%08x 0x%08x\n", 
              ((int *)pc)[i], 
              ((int *)pc)[i+1], 
              ((int *)pc)[i+2], 
              ((int *)pc)[i+3]); 
    } 
#endif /* DISASSEMBLE_CODE */ 
  } 
  x = eval_instruction_low(pc); 
  pike_trace(3, "-    eval_instruction(%p) ==> %d\n", pc, x); 
  return x; 
} 
 
static int eval_instruction_low(PIKE_OPCODE_T *pc) 
#endif /* PIKE_DEBUG */ 
{ 
#ifndef OPCODE_INLINE_RETURN 
  if(pc == NULL) { 
    if(do_inter_return_label != NULL) 
      Pike_fatal("eval_instruction called with NULL (twice).\n"); 
 
#ifdef __GNUC__ 
    do_inter_return_label = && inter_return_label; 
#elif defined (_M_IX86) 
    /* MSVC. */ 
    _asm 
    { 
      lea eax,inter_return_label 
      mov do_inter_return_label,eax 
    } 
#else 
#error Machine code not supported with this compiler. 
#endif 
 
#if 0 
    /* Paranoia. 
     * 
     * This can happen on systems with delay slots if the labels aren't 
     * used explicitly. 
     */ 
    if (do_inter_return_label == do_escape_catch_label) { 
      Pike_fatal("Inter return and escape catch labels are equal: %p\n", 
                 do_inter_return_label); 
    } 
#endif 
 
    /* Trick optimizer */ 
    if(!dummy_label) 
      return 0; 
  } 
 
  /* This else is important to avoid an overoptimization bug in (at 
   * least) gcc 4.0.2 20050808 which caused the address stored in 
   * do_inter_return_label to be at the CALL_MACHINE_CODE below. */ 
  else { 
#endif /* !OPCODE_INLINE_RETURN */ 
    CALL_MACHINE_CODE(pc); 
 
#ifndef OPCODE_INLINE_RETURN 
    /* This code is never reached, but will 
     * prevent gcc from optimizing the labels below too much 
     */ 
 
    DWERR("We have reached the end of the world!\n"); 
  } 
 
#ifdef __GNUC__ 
  goto *dummy_label; 
#endif 
 
 inter_return_label: 
#endif /*!OPCODE_INLINE_RETURUN */ 
#ifdef PIKE_DEBUG 
  pike_trace(3, "-    Inter return\n"); 
#endif 
  EXIT_MACHINE_CODE(); 
  return -1; 
} 
 
#else /* PIKE_USE_MACHINE_CODE */ 
 
 
#ifndef SET_PROG_COUNTER 
#define SET_PROG_COUNTER(X)   (PROG_COUNTER=(X)) 
#endif /* SET_PROG_COUNTER */ 
 
#ifdef HAVE_COMPUTED_GOTO 
int lookup_sort_fun(const void *a, const void *b) 
{ 
  return (int)(((ptrdiff_t)((struct op_2_f *)a)->opcode) - 
               ((ptrdiff_t)((struct op_2_f *)b)->opcode)); 
} 
#endif /* HAVE_COMPUTED_GOTO */ 
 
/* NOTE: Due to the implementation of computed goto, 
 *       interpreter.h may only be included once. 
 */ 
#if defined(PIKE_DEBUG) && !defined(HAVE_COMPUTED_GOTO) 
#define eval_instruction eval_instruction_with_debug 
#include "interpreter_debug.h" 
 
#undef eval_instruction 
#define eval_instruction eval_instruction_without_debug 
 
#undef PIKE_DEBUG 
#undef NDEBUG 
#undef DO_IF_DEBUG 
#define DO_IF_DEBUG(X) 
#define print_return_value() 
#include "interpreter.h" 
 
#define PIKE_DEBUG 
#define NDEBUG 
#undef DO_IF_DEBUG 
#define DO_IF_DEBUG(X) X 
#undef print_return_value 
 
#undef eval_instruction 
 
static inline int eval_instruction(unsigned char *pc) 
{ 
  if(d_flag || Pike_interpreter.trace_level>2) 
    return eval_instruction_with_debug(pc); 
  else 
    return eval_instruction_without_debug(pc); 
} 
 
 
#else /* !PIKE_DEBUG || HAVE_COMPUTED_GOTO */ 
#include "interpreter.h" 
#endif 
 
 
#endif /* PIKE_USE_MACHINE_CODE */ 
 
#undef REAL_PIKE_DEBUG 
#undef DO_IF_REAL_DEBUG 
#undef DO_IF_NOT_REAL_DEBUG 
 
 
ATTRIBUTE((noinline)) 
static void do_trace_call(struct byte_buffer *b, INT32 args) 
{ 
  struct pike_string *filep = NULL; 
  char *file; 
  const char *s; 
  INT_TYPE linep; 
  INT32 e; 
  ptrdiff_t len = 0; 
 
  buffer_add_str(b, "("); 
  for(e=0;e<args;e++) 
  { 
    if(e) buffer_add_str(b, ","); 
    safe_describe_svalue(b, Pike_sp-args+e,0,0); 
  } 
  buffer_add_str(b, ")"); 
 
  if(buffer_content_length(b) > TRACE_LEN) 
  { 
    buffer_remove(b, buffer_content_length(b) - TRACE_LEN); 
    buffer_add_str(b, "..."); 
  } 
 
  if(Pike_fp && Pike_fp->pc) 
  { 
    char *f; 
    filep = get_line(Pike_fp->pc,Pike_fp->context->prog,&linep); 
    if (filep->size_shift) 
      file = "..."; 
    else { 
      file = filep->str; 
      while((f = strchr(file, '/')) 
#ifdef __NT__ 
            || (f = strchr(file, '\\')) 
#endif /* __NT__ */ 
            ) 
        file=f+1; 
      len = filep->len - (file - filep->str); 
    } 
  }else{ 
    linep=0; 
    file="-"; 
  } 
 
  s = buffer_get_string(b); 
 
  if (len < 30) 
  { 
    char buf[40]; 
    if (linep) 
      snprintf(buf, sizeof (buf), "%s:%ld:", file, (long)linep); 
    else 
      snprintf(buf, sizeof (buf), "%s:", file); 
    fprintf(stderr, "- %-20s %s\n",buf,s); 
  } else if (linep) { 
    fprintf(stderr, "- %s:%ld: %s\n", file, (long)linep, s); 
  } else { 
    fprintf(stderr, "- %s: %s\n", file, s); 
  } 
 
  if (filep) { 
    free_string(filep); 
  } 
  buffer_free(b); 
} 
 
ATTRIBUTE((noinline)) 
static void do_trace_function_call(const struct object *o, const struct identifier *function, INT32 args) { 
  struct byte_buffer buffer = BUFFER_INIT(); 
  char buf[50]; 
 
  sprintf(buf, "%lx->", (long) PTR_TO_INT (o)); 
  buffer_add_str(&buffer, buf); 
  if (function->name->size_shift) 
    buffer_add_str (&buffer, "[widestring function name]"); 
  else 
    buffer_add_str(&buffer, function->name->str); 
  do_trace_call(&buffer, args); 
} 
 
ATTRIBUTE((noinline)) 
static void do_trace_efun_call(const struct svalue *s, INT32 args) { 
  struct byte_buffer buf = BUFFER_INIT(); 
  if (s->u.efun->name->size_shift) 
    buffer_add_str (&buf, "[widestring function name]"); 
  else 
    buffer_add_str (&buf, s->u.efun->name->str); 
  do_trace_call(&buf, args); 
} 
 
ATTRIBUTE((noinline)) 
static void do_trace_svalue_call(const struct svalue *s, INT32 args) { 
  struct byte_buffer buf = BUFFER_INIT(); 
  safe_describe_svalue(&buf, s,0,0); 
  do_trace_call(&buf, args); 
} 
 
 
ATTRIBUTE((noinline)) 
static void do_trace_func_return (int got_retval, struct object *o, int fun) 
{ 
  struct byte_buffer b = BUFFER_INIT(); 
  if (o) { 
    if (o->prog) { 
      struct identifier *id = ID_FROM_INT (o->prog, fun); 
      char buf[50]; 
      sprintf(buf, "%lx->", (long) PTR_TO_INT (o)); 
      buffer_add_str(&b, buf); 
      if (id->name->size_shift) 
        buffer_add_str (&b, "[widestring function name]"); 
      else 
        buffer_add_str(&b, id->name->str); 
      buffer_add_str (&b, "() "); 
    } 
    else 
      buffer_add_str (&b, "function in destructed object "); 
  } 
  do_trace_return (&b, got_retval); 
} 
 
#ifdef PIKE_DEBUG 
ATTRIBUTE((noinline)) 
static void do_trace_efun_return(const struct svalue *s, int got_retval) { 
  struct byte_buffer buf = BUFFER_INIT(); 
  if (s->u.efun->name->size_shift) 
    buffer_add_str (&buf, "[widestring function name]"); 
  else 
    buffer_add_str (&buf, s->u.efun->name->str); 
  buffer_add_str (&buf, "() "); 
  do_trace_return (&buf, got_retval); 
} 
#endif 
 
ATTRIBUTE((noinline)) 
static void do_trace_return (struct byte_buffer *b, int got_retval) 
{ 
  struct pike_string *filep = NULL; 
  char *file; 
  const char *s; 
  INT_TYPE linep; 
 
  if (got_retval) { 
    buffer_add_str (b, "returns: "); 
    safe_describe_svalue(b, Pike_sp-1,0,0); 
  } 
  else 
    buffer_add_str (b, "returns with no value"); 
 
  if(buffer_content_length(b) > TRACE_LEN) 
  { 
    buffer_remove(b, buffer_content_length(b) - TRACE_LEN); 
    buffer_add_str(b, "..."); 
  } 
 
  s = buffer_get_string(b); 
 
  if(Pike_fp && Pike_fp->pc) 
  { 
    char *f; 
    filep = get_line(Pike_fp->pc,Pike_fp->context->prog,&linep); 
    if (filep->size_shift) 
      file = "..."; 
    else { 
      file = filep->str; 
      while((f=strchr(file,'/'))) 
        file=f+1; 
    } 
  }else{ 
    linep=0; 
    file="-"; 
  } 
 
  { 
    char buf[40]; 
    if (linep) 
      snprintf(buf, sizeof (buf), "%s:%ld:", file, (long)linep); 
    else 
      snprintf(buf, sizeof (buf), "%s:", file); 
    fprintf(stderr,"- %-20s %s\n",buf,s); 
  } 
 
  if (filep) { 
    free_string(filep); 
  } 
  buffer_free(b); 
} 
 
static struct pike_frame_chunk { 
  struct pike_frame_chunk *next; 
} *pike_frame_chunks; 
static int num_pike_frame_chunks; 
static int num_pike_frames; 
 
PMOD_EXPORT void really_free_pike_frame( struct pike_frame *X ) 
{ 
    free_object(X->current_object); 
    if(X->current_program) 
        free_program(X->current_program); 
    if(X->scope) 
        free_pike_scope(X->scope); 
    DO_IF_DEBUG( 
        if(X->flags & PIKE_FRAME_MALLOCED_LOCALS) 
            Pike_fatal("Pike frame is not supposed to have malloced locals here!\n")); 
    if (X->flags & PIKE_FRAME_SAVE_LOCALS) { 
      free(X->save_locals_bitmask); 
      X->flags &= ~PIKE_FRAME_SAVE_LOCALS; 
    } 
  DO_IF_DMALLOC( 
    X->current_program=0; 
    X->context=0; 
    X->scope=0; 
    X->current_object=0; 
    X->flags=0; 
    X->expendible_offset=0; 
    X->locals=0; 
  ); 
  X->next = free_pike_frame; 
  PIKE_MEMPOOL_FREE(&free_pike_frame, X, sizeof(struct pike_frame)); 
  free_pike_frame = X; 
} 
 
struct pike_frame *alloc_pike_frame(void) 
{ 
    struct pike_frame *res; 
    if( free_pike_frame ) 
    { 
      res = free_pike_frame; 
      PIKE_MEMPOOL_ALLOC(&free_pike_frame, res, sizeof(struct pike_frame)); 
      PIKE_MEM_RW_RANGE(&res->next, sizeof(void*)); 
      free_pike_frame = res->next; 
      PIKE_MEM_WO_RANGE(&res->next, sizeof(void*)); 
      res->refs=0; 
      add_ref(res);     /* For DMALLOC... */ 
      res->flags=0; 
      res->next=0; 
      res->scope=0; 
      return res; 
    } 
 
    /* Need to allocate more. */ 
    { 
      unsigned int i; 
#define FRAMES_PER_CHUNK ((4096*4-8-sizeof(struct pike_frame_chunk))/sizeof(struct pike_frame)) 
#define FRAME_CHUNK_SIZE (FRAMES_PER_CHUNK*sizeof(struct pike_frame))+sizeof(struct pike_frame_chunk) 
 
      void *p = xalloc( FRAME_CHUNK_SIZE ); 
      num_pike_frame_chunks++; 
      ((struct pike_frame_chunk*)p)->next = pike_frame_chunks; 
      pike_frame_chunks = p; 
      free_pike_frame = res = (struct pike_frame*)((char*)p+sizeof(struct pike_frame_chunk)); 
      for( i=1; i<FRAMES_PER_CHUNK; i++ ) 
      { 
        res->next = &free_pike_frame[i]; 
        res = res->next; 
      } 
      res->next = NULL; 
      num_pike_frames+=FRAMES_PER_CHUNK; 
    } 
    return alloc_pike_frame(); 
} 
 
void count_memory_in_pike_frames(size_t *num, size_t *size ) 
{ 
  *num = num_pike_frames; 
  *size = num_pike_frame_chunks * (FRAME_CHUNK_SIZE*8); 
} 
#undef FRAMES_PER_CHUNK 
#undef FRAME_CHUNK_SIZE 
 
#ifdef DO_PIKE_CLEANUP 
static void free_all_pike_frame_blocks(void) 
{ 
  struct pike_frame_chunk *x = pike_frame_chunks, *n; 
  while( x ) 
  { 
    n = x->next; 
    free(x); 
    x = n; 
  } 
  free_pike_frame = NULL; 
  pike_frame_chunks = NULL; 
  num_pike_frames=0; 
  num_pike_frame_chunks=0; 
} 
#endif 
 
void really_free_pike_scope(struct pike_frame *scope) 
{ 
  if(scope->flags & PIKE_FRAME_MALLOCED_LOCALS) 
  { 
    free_mixed_svalues(scope->locals,scope->num_locals); 
    free(scope->locals); 
#ifdef PIKE_DEBUG 
    scope->flags&=~PIKE_FRAME_MALLOCED_LOCALS; 
#endif 
  } 
  really_free_pike_frame(scope); 
} 
 
void *lower_mega_apply( INT32 args, struct object *o, ptrdiff_t fun ) 
{ 
  struct program *p; 
  check_stack(256); 
  check_mark_stack(256); 
 
  if( (p = o->prog) ) 
  { 
    struct svalue *save_sp = Pike_sp - args; 
    struct reference *ref = p->identifier_references + fun; 
    struct inherit *context = p->inherits + ref->inherit_offset; 
    struct identifier *function = context->prog->identifiers + ref->identifier_offset; 
    struct svalue *constant = NULL; 
    struct pike_frame *new_frame = NULL; 
 
    int type = (function->identifier_flags & (IDENTIFIER_TYPE_MASK|IDENTIFIER_ALIAS)); 
    if( o->prog != pike_trampoline_program && function->func.offset != -1 ) 
    { 
      switch( type ) 
      { 
        case IDENTIFIER_CONSTANT: 
          constant = &context->prog->constants[function->func.const_info.offset].sval; 
          if( TYPEOF(*constant) != PIKE_T_PROGRAM ) 
            break; 
        case IDENTIFIER_C_FUNCTION: 
        case IDENTIFIER_PIKE_FUNCTION: 
          if( !new_frame ) 
          { 
            new_frame=alloc_pike_frame(); 
            debug_malloc_touch(new_frame); 
          } 
#ifdef PROFILING 
          new_frame->children_base = Pike_interpreter.accounted_time; 
          new_frame->start_time = get_cpu_time() - Pike_interpreter.unlocked_time; 
 
          /* This is mostly for profiling, but 
           * could also be used to find out the name of a function 
           * in a destructed object. -hubbe 
           * 
           * Since it not used for anything but profiling yet, I will 
           * put it here until someone needs it. -Hubbe 
           */ 
          new_frame->ident = ref->identifier_offset; 
          W_PROFILING_DEBUG("%p{: Push at %" PRINT_CPU_TIME 
                            " %" PRINT_CPU_TIME "\n", 
                            Pike_interpreter.thread_state, 
                            new_frame->start_time, 
                            new_frame->children_base); 
#endif 
          new_frame->next = Pike_fp; 
          add_ref(new_frame->current_object = o); 
          add_ref(new_frame->current_program = p); 
          new_frame->context = context; 
          new_frame->fun = (unsigned INT16)fun; 
          new_frame->locals = save_sp; 
          new_frame->args = args; 
          new_frame->save_sp_offset = 0; 
          new_frame->expendible_offset = 0; 
 
#ifdef PIKE_DEBUG 
          if (Pike_in_gc > GC_PASS_PREPARE && Pike_in_gc < GC_PASS_FREE) 
            Pike_fatal("Pike code called within gc.\n"); 
#endif 
 
          Pike_fp = new_frame; 
          debug_malloc_touch(Pike_fp); 
#ifdef PROFILING 
          function->num_calls++; 
          function->recur_depth++; 
#endif 
#ifdef PIKE_USE_MACHINE_CODE 
          call_check_threads_etc(); 
#endif 
 
          if( !constant ) 
          { 
            if (PIKE_FN_START_ENABLED()) 
            { 
              /* DTrace enter probe 
                 arg0: function name 
                 arg1: object 
              */ 
              struct byte_buffer obj_name = BUFFER_INIT(); 
              struct svalue obj_sval; 
              SET_SVAL(obj_sval, T_OBJECT, 0, object, o); 
              safe_describe_svalue(&obj_name, &obj_sval, 0, NULL); 
              PIKE_FN_START(function->name->size_shift == 0 ? 
                            function->name->str : "[widestring fn name]", 
                            buffer_get_string(s)); 
              buffer_free(&obj_name); 
            } 
            if(UNLIKELY(Pike_interpreter.trace_level)) 
            { 
              do_trace_function_call(o, function, args); 
            } 
            new_frame->current_storage = o->storage+context->storage_offset; 
            if( type == IDENTIFIER_C_FUNCTION ) 
            { 
              new_frame->num_args = args; 
              new_frame->num_locals = args; 
              new_frame->pc = 0; 
#ifndef PIKE_USE_MACHINE_CODE 
              FAST_CHECK_THREADS_ON_CALL(); 
#endif 
              (*function->func.c_fun)(args); 
 
              /* .. and below follows what is basically a copy of the 
               * low_return function... 
               */ 
              if(save_sp+1 > Pike_sp) 
              { 
                push_int(0); 
              } else if(save_sp+1 < Pike_sp) { 
                stack_pop_n_elems_keep_top( Pike_sp-save_sp-1 ); 
              } 
              if(UNLIKELY(Pike_interpreter.trace_level>1)) 
                do_trace_func_return (1, o, fun); 
              goto pop; 
            } 
            new_frame->save_mark_sp=Pike_mark_sp; 
            new_frame->pc = new_frame->context->prog->program + function->func.offset 
#ifdef ENTRY_PROLOGUE_SIZE 
              + ENTRY_PROLOGUE_SIZE 
#endif /* ENTRY_PROLOGUE_SIZE */ 
              ; 
            return new_frame->pc; 
          } 
          else 
          { 
            struct object *tmp; 
            new_frame->pc = 0; 
            new_frame->num_args = 0; 
            tmp=parent_clone_object(constant->u.program, 
                                    o, 
                                    fun, 
                                    args); 
            push_object(tmp); 
          pop: 
            POP_PIKE_FRAME(); 
            return 0; 
          } 
      } 
    } 
  } 
  return low_mega_apply( APPLY_LOW, args, o, (void*)fun ); 
} 
 
/* Apply a function. 
 * 
 * Application types: 
 * 
 *   APPLY_STACK:         Apply Pike_sp[-args] with args-1 arguments. 
 * 
 *   APPLY_SVALUE:        Apply the svalue at arg1, and adjust the stack 
 *                        to leave a return value. 
 * 
 *   APPLY_SVALUE_STRICT: Apply the svalue at arg1, and don't adjust the 
 *                        stack for functions that return void. 
 * 
 *   APPLY_LOW:           Apply function #arg2 in object arg1. 
 * 
 * Return values: 
 * 
 *   Returns zero if the function was invalid or has been executed. 
 * 
 *   Returns one if a frame has been set up to start the function 
 *   with eval_instruction(Pike_fp->pc - ENTRY_PROLOGUE_SIZE). After 
 *   eval_instruction() is done the frame needs to be removed by a call 
 *   to low_return() or low_return_pop(). 
 */ 
void* low_mega_apply(enum apply_type type, INT32 args, void *arg1, void *arg2) 
{ 
  struct object *o = NULL; 
  struct pike_frame *scope=0; 
  ptrdiff_t fun=0; 
  struct svalue *save_sp=Pike_sp-args; 
 
#if defined(PIKE_DEBUG) && defined(_REENTRANT) 
  if(d_flag) 
    { 
      THREAD_T self = th_self(); 
 
      CHECK_INTERPRETER_LOCK(); 
 
      if (Pike_interpreter.thread_state) { 
        if (!th_equal(Pike_interpreter.thread_state->id, self)) 
          Pike_fatal("Current thread is wrong.\n"); 
 
        DEBUG_CHECK_THREAD(); 
      } 
    } 
#endif 
 
  switch(type) 
  { 
  case APPLY_STACK: 
    if(!args) 
      PIKE_ERROR("`()", "Too few arguments (apply stack).\n", Pike_sp, 0); 
    args--; 
    arg1=(void *)(Pike_sp-args-1); 
 
    /* FALL_THROUGH */ 
 
  case APPLY_SVALUE: 
  case APPLY_SVALUE_STRICT: 
  apply_svalue: 
  { 
    struct svalue *s=(struct svalue *)arg1; 
    switch(TYPEOF(*s)) 
    { 
    case T_INT: 
      if (!s->u.integer) { 
        PIKE_ERROR("0", "Attempt to call the NULL-value\n", Pike_sp, args); 
      } else { 
        Pike_error("Attempt to call the value %"PRINTPIKEINT"d\n", 
                   s->u.integer); 
      } 
      break; 
 
    case T_STRING: 
      if (s->u.string->len > 20) { 
        Pike_error("Attempt to call the string \"%20S\"...\n", s->u.string); 
      } else { 
        Pike_error("Attempt to call the string \"%S\"\n", s->u.string); 
      } 
      break; 
 
    case T_MAPPING: 
      Pike_error("Attempt to call a mapping\n"); 
      break; 
 
    default: 
      Pike_error("Call to non-function value type:%s.\n", 
                 get_name_of_type(TYPEOF(*s))); 
      break; 
 
    case T_FUNCTION: 
      if(SUBTYPEOF(*s) == FUNCTION_BUILTIN) 
      { 
#ifdef PIKE_DEBUG 
        struct svalue *expected_stack = Pike_sp-args; 
#endif 
        if(Pike_interpreter.trace_level>1) 
        { 
          do_trace_efun_call(s, args); 
        } 
        if (PIKE_FN_START_ENABLED()) { 
          /* DTrace enter probe 
             arg0: function name 
             arg1: object 
           */ 
          PIKE_FN_START(s->u.efun->name->size_shift == 0 ? 
                        s->u.efun->name->str : "[widestring fn name]", 
                        ""); 
        } 
        FAST_CHECK_THREADS_ON_CALL(); 
        (*(s->u.efun->function))(args); 
        if (PIKE_FN_DONE_ENABLED()) { 
          /* DTrace leave probe 
             arg0: function name 
          */ 
          PIKE_FN_DONE(s->u.efun->name->size_shift == 0 ? 
                       s->u.efun->name->str : "[widestring fn name]"); 
        } 
 
#ifdef PIKE_DEBUG 
        s->u.efun->runs++; 
        if(Pike_sp != expected_stack + !s->u.efun->may_return_void) 
        { 
          if(Pike_sp < expected_stack) 
            Pike_fatal("Function popped too many arguments: %S\n", 
                       s->u.efun->name); 
          if(Pike_sp>expected_stack+1) 
            Pike_fatal("Function left droppings on stack: %S\n", 
                       s->u.efun->name); 
          if(Pike_sp == expected_stack && !s->u.efun->may_return_void) 
            Pike_fatal("Non-void function returned without return value on stack: %S %d\n", 
                       s->u.efun->name, s->u.efun->may_return_void); 
          if(Pike_sp==expected_stack+1 && s->u.efun->may_return_void) 
            Pike_fatal("Void function returned with a value on the stack: %S %d\n", 
                       s->u.efun->name, s->u.efun->may_return_void); 
        } 
#endif 
 
        break; 
      }else{ 
        type=APPLY_SVALUE; 
        o=s->u.object; 
        fun = SUBTYPEOF(*s); 
        if(o->prog == pike_trampoline_program && 
           fun == QUICK_FIND_LFUN(pike_trampoline_program, LFUN_CALL)) 
        { 
          fun=((struct pike_trampoline *)(o->storage))->func; 
          scope=((struct pike_trampoline *)(o->storage))->frame; 
          o=scope->current_object; 
        } 
        goto apply_low; 
      } 
      break; 
 
    case T_ARRAY: 
      if(Pike_interpreter.trace_level) 
      { 
        do_trace_svalue_call(s, args); 
      } 
      if (PIKE_FN_START_ENABLED()) { 
        /* DTrace enter probe 
           arg0: function name 
           arg1: object 
        */ 
        PIKE_FN_START("[array]", ""); 
      } 
      apply_array(s->u.array, args, (type == APPLY_STACK)); 
      break; 
 
    case PIKE_T_TYPE: 
      if (args != 1) { 
        /* FIXME: Casts to object ought to propagate to apply program below. */ 
        SIMPLE_WRONG_NUM_ARGS_ERROR("cast", 1); 
      } 
      o_cast(s->u.type, compile_type_to_runtime_type(s->u.type)); 
      break; 
 
    case T_PROGRAM: 
      if(Pike_interpreter.trace_level) 
      { 
        do_trace_svalue_call(s, args); 
      } 
      if (PIKE_FN_START_ENABLED()) { 
        /* DTrace enter probe 
           arg0: function name 
           arg1: object 
        */ 
        struct byte_buffer buf = BUFFER_INIT(); 
        safe_describe_svalue(&buf, s,0,0); 
        PIKE_FN_START("[program]", buffer_get_string(&buf)); 
        buffer_free(&buf); 
      } 
      push_object(clone_object(s->u.program,args)); 
      break; 
 
    case T_OBJECT: 
      /* FIXME: Object subtypes! */ 
      o=s->u.object; 
      if(o->prog == pike_trampoline_program) 
      { 
        fun=((struct pike_trampoline *)(o->storage))->func; 
        scope=((struct pike_trampoline *)(o->storage))->frame; 
        o=scope->current_object; 
        goto apply_low; 
      } 
      fun=LFUN_CALL; 
      type=APPLY_SVALUE; 
      goto call_lfun; 
    } 
    break; 
  } 
 
  call_lfun: { 
    int lfun; 
#ifdef PIKE_DEBUG 
    if(fun < 0 || fun >= NUM_LFUNS) 
      Pike_fatal("Apply lfun on illegal value!\n"); 
#endif 
    if(!o->prog) 
      PIKE_ERROR("destructed object", "Apply on destructed object.\n", Pike_sp, args); 
    lfun = FIND_LFUN(o->prog, fun); 
    if (lfun < 0) 
      Pike_error ("Cannot call undefined lfun %s.\n", lfun_names[fun]); 
    fun = lfun; 
    goto apply_low; 
  } 
 
  case APPLY_LOW: 
    o = (struct object *)arg1; 
    fun = PTR_TO_INT(arg2); 
    if(o->prog == pike_trampoline_program && 
       fun == QUICK_FIND_LFUN(pike_trampoline_program, LFUN_CALL)) 
    { 
      fun=((struct pike_trampoline *)(o->storage))->func; 
      scope=((struct pike_trampoline *)(o->storage))->frame; 
      o=scope->current_object; 
    } 
 
  apply_low: 
#include "apply_low.h" 
    break; 
  } 
 
  if(save_sp+1 > Pike_sp) 
  { 
    if(type != APPLY_SVALUE_STRICT) { 
      push_int(0); 
      if(Pike_interpreter.trace_level>1) 
        do_trace_func_return (1, o, fun); 
    } 
    else 
      if(Pike_interpreter.trace_level>1) 
        do_trace_func_return (0, o, fun); 
  }else{ 
    if(save_sp+1 < Pike_sp) 
    { 
      assign_svalue(save_sp,Pike_sp-1); 
      pop_n_elems(Pike_sp-save_sp-1); 
      low_destruct_objects_to_destruct(); /* consider using a flag for immediate destruct instead... */ 
    } 
    if(Pike_interpreter.trace_level>1) 
      do_trace_func_return (1, o, fun); 
  } 
 
  if (PIKE_FN_DONE_ENABLED()) { 
    /* DTrace leave probe 
       arg0: function name 
    */ 
    char *fn = "(unknown)"; 
    if (o && o->prog) { 
      struct identifier *id = ID_FROM_INT(o->prog, fun); 
      fn = id->name->size_shift == 0 ? id->name->str : "[widestring fn name]"; 
    } 
    PIKE_FN_DONE(fn); 
  } 
 
  return 0; 
} 
 
 
 
#define basic_low_return(save_sp)                     \ 
  DO_IF_DEBUG(                                          \ 
    if(Pike_mark_sp < Pike_fp->save_mark_sp)            \ 
      Pike_fatal("Popped below save_mark_sp!\n");       \ 
    if(Pike_sp<Pike_interpreter.evaluator_stack)        \ 
      Pike_fatal("Stack error (also simple).\n");       \ 
    )                                                   \ 
                                                        \ 
    Pike_mark_sp=Pike_fp->save_mark_sp;                 \ 
                                                        \ 
  POP_PIKE_FRAME() 
 
 
void low_return(void) 
{ 
  struct svalue *save_sp = frame_get_save_sp(Pike_fp)+1; 
  struct object *o = Pike_fp->current_object; 
  int fun = Pike_fp->fun; 
 
  if (PIKE_FN_DONE_ENABLED()) { 
    /* DTrace leave probe 
       arg0: function name 
    */ 
    char *fn = "(unknown)"; 
    if (o && o->prog) { 
      struct identifier *id = ID_FROM_INT(o->prog, fun); 
      fn = id->name->size_shift == 0 ? id->name->str : "[widestring fn name]"; 
    } 
    PIKE_FN_DONE(fn); 
  } 
 
#if defined (PIKE_USE_MACHINE_CODE) && defined (OPCODE_RETURN_JUMPADDR) 
  /* If the function that returns is the only ref to the current 
   * object and its program then the program would be freed in 
   * destruct_objects_to_destruct below. However, we're still 
   * executing in an opcode in its code so we need prog->program to 
   * stick around for a little while more to handle the returned 
   * address. We therefore add a ref to the current object so that 
   * it'll live through this function. */ 
  add_ref (o); 
#endif 
 
  basic_low_return (save_sp); 
 
  stack_pop_n_elems_keep_top (Pike_sp - save_sp); 
  { 
      /* consider using a flag for immediate destruct instead... */ 
      extern struct object *objects_to_destruct; 
      if( objects_to_destruct ) 
          destruct_objects_to_destruct(); 
  } 
 
#ifdef PIKE_DEBUG 
  if(save_sp > Pike_sp) 
      Pike_fatal("Pike function did not leave an return value\n"); 
#endif 
 
  if(UNLIKELY(Pike_interpreter.trace_level>1)) 
    do_trace_func_return (1, o, fun); 
 
#if defined (PIKE_USE_MACHINE_CODE) && defined (OPCODE_RETURN_JUMPADDR) 
  free_object (o); 
#endif 
} 
 
void low_return_pop(void) 
{ 
  struct svalue *save_sp = frame_get_save_sp(Pike_fp); 
#if defined (PIKE_USE_MACHINE_CODE) && defined (OPCODE_RETURN_JUMPADDR) 
  /* See note above. */ 
  struct object *o = Pike_fp->current_object; 
  add_ref (o); 
#endif 
 
  if (PIKE_FN_DONE_ENABLED()) { 
    /* DTrace leave probe 
       arg0: function name 
    */ 
    char *fn = "(unknown)"; 
    struct object *o = Pike_fp->current_object; 
    int fun = Pike_fp->fun; 
    if (o && o->prog) { 
      struct identifier *id = ID_FROM_INT(o->prog, fun); 
      fn = id->name->size_shift == 0 ? id->name->str : "[widestring fn name]"; 
    } 
    PIKE_FN_DONE(fn); 
  } 
 
  basic_low_return (save_sp); 
 
  pop_n_elems(Pike_sp-save_sp); 
  /* consider using a flag for immediate destruct instead... */ 
  destruct_objects_to_destruct(); 
 
#if defined (PIKE_USE_MACHINE_CODE) && defined (OPCODE_RETURN_JUMPADDR) 
  free_object (o); 
#endif 
} 
 
 
void unlink_previous_frame(void) 
{ 
  struct pike_frame *current, *prev; 
 
  current=Pike_interpreter.frame_pointer; 
  prev=current->next; 
#ifdef PIKE_DEBUG 
  { 
    JMP_BUF *rec; 
 
    /* Check if any recoveries belong to the frame we're 
     * about to unlink. 
     */ 
    if((rec=Pike_interpreter.recoveries)) 
    { 
      while(rec->frame_pointer == current) rec=rec->previous; 
      /* FIXME: Wouldn't a simple return be ok? */ 
      if(rec->frame_pointer == current->next) 
        Pike_fatal("You can't touch this!\n"); 
    } 
  } 
#endif 
  /* Save various fields from the previous frame. 
   */ 
  frame_set_save_sp(current, frame_get_save_sp(prev)); 
  current->save_mark_sp=prev->save_mark_sp; 
  current->flags = prev->flags & PIKE_FRAME_RETURN_MASK; 
 
  /* Unlink the top frame temporarily. */ 
  Pike_interpreter.frame_pointer=prev; 
 
#ifdef PROFILING 
  { 
    /* We must update the profiling info of the previous frame 
     * to account for that the current frame has gone away. 
     */ 
    cpu_time_t total_time = 
      get_cpu_time() - (Pike_interpreter.unlocked_time + current->start_time); 
    cpu_time_t child_time = 
      Pike_interpreter.accounted_time - current->children_base; 
    struct identifier *function = 
      current->context->prog->identifiers + current->ident; 
    if (!function->recur_depth) 
      function->total_time += total_time; 
    total_time -= child_time; 
    function->self_time += total_time; 
    Pike_interpreter.accounted_time += total_time; 
#ifdef PROFILING_DEBUG 
    fprintf(stderr, "%p: Unlinking previous frame.\n" 
            "Previous: %" PRINT_CPU_TIME " %" PRINT_CPU_TIME "\n" 
            "Current:  %" PRINT_CPU_TIME " %" PRINT_CPU_TIME "\n", 
            Pike_interpreter.thread_state, 
            prev->start_time, prev->children_base, 
            current->start_time, current->children_base); 
#endif /* PROFILING_DEBUG */ 
  } 
#endif /* PROFILING */ 
 
  /* Unlink the frame. */ 
  POP_PIKE_FRAME(); 
 
  /* Hook our frame again. */ 
  current->next=Pike_interpreter.frame_pointer; 
  Pike_interpreter.frame_pointer=current; 
 
#ifdef PROFILING 
  current->children_base = Pike_interpreter.accounted_time; 
  current->start_time = get_cpu_time() - Pike_interpreter.unlocked_time; 
#endif /* PROFILING */ 
} 
 
static void restore_catching_eval_jmpbuf (LOW_JMP_BUF *p) 
{ 
  Pike_interpreter.catching_eval_jmpbuf = p; 
} 
 
PMOD_EXPORT void mega_apply(enum apply_type type, INT32 args, void *arg1, void *arg2) 
{ 
  /* Save and clear Pike_interpreter.catching_eval_jmpbuf so that the 
   * following eval_instruction will install a LOW_JMP_BUF of its 
   * own to handle catches. */ 
  LOW_JMP_BUF *saved_jmpbuf = Pike_interpreter.catching_eval_jmpbuf; 
  ONERROR uwp; 
  Pike_interpreter.catching_eval_jmpbuf = NULL; 
  SET_ONERROR (uwp, restore_catching_eval_jmpbuf, saved_jmpbuf); 
 
  /* The C stack margin is normally 8 kb, but if we get here during a 
   * lowered margin then don't fail just because of that, unless it's 
   * practically zero. */ 
  check_c_stack(Pike_interpreter.c_stack_margin ? 
                Pike_interpreter.c_stack_margin : 100); 
  if( low_mega_apply(type, args, arg1, arg2) ) 
  { 
    eval_instruction(Pike_fp->pc 
#ifdef ENTRY_PROLOGUE_SIZE 
                     - ENTRY_PROLOGUE_SIZE 
#endif /* ENTRY_PROLOGUE_SIZE */ 
                     ); 
    low_return(); 
  } 
  CALL_AND_UNSET_ONERROR(uwp); 
} 
 
PMOD_EXPORT void mega_apply_low(INT32 args, void *arg1, ptrdiff_t arg2) 
{ 
  /* Save and clear Pike_interpreter.catching_eval_jmpbuf so that the 
   * following eval_instruction will install a LOW_JMP_BUF of its 
   * own to handle catches. */ 
  LOW_JMP_BUF *saved_jmpbuf = Pike_interpreter.catching_eval_jmpbuf; 
  ONERROR uwp; 
  Pike_interpreter.catching_eval_jmpbuf = NULL; 
  SET_ONERROR (uwp, restore_catching_eval_jmpbuf, saved_jmpbuf); 
 
  /* The C stack margin is normally 8 kb, but if we get here during a 
   * lowered margin then don't fail just because of that, unless it's 
   * practically zero. */ 
  check_c_stack(Pike_interpreter.c_stack_margin ? 
                Pike_interpreter.c_stack_margin : 100); 
  if( lower_mega_apply( args, arg1, arg2 ) ) 
  { 
    eval_instruction(Pike_fp->pc 
#ifdef ENTRY_PROLOGUE_SIZE 
                     - ENTRY_PROLOGUE_SIZE 
#endif /* ENTRY_PROLOGUE_SIZE */ 
                     ); 
    low_return(); 
  } 
  CALL_AND_UNSET_ONERROR(uwp); 
} 
 
/* Put catch outside of eval_instruction, so the setjmp won't affect 
 * the optimization of eval_instruction. 
 */ 
static int catching_eval_instruction (PIKE_OPCODE_T *pc) 
{ 
  LOW_JMP_BUF jmpbuf; 
#ifdef PIKE_DEBUG 
  if (Pike_interpreter.catching_eval_jmpbuf) 
    Pike_fatal ("catching_eval_jmpbuf already active.\n"); 
#endif 
  Pike_interpreter.catching_eval_jmpbuf = &jmpbuf; 
  if (LOW_SETJMP (jmpbuf)) 
  { 
    Pike_interpreter.catching_eval_jmpbuf = NULL; 
#ifdef PIKE_DEBUG 
    pike_trace(3, "-    catching_eval_instruction(%p) caught error ==> -3\n", 
               pc); 
#endif 
    return -3; 
  }else{ 
    int x; 
    check_c_stack(8192); 
    x = eval_instruction(pc); 
    Pike_interpreter.catching_eval_jmpbuf = NULL; 
#ifdef PIKE_DEBUG 
    pike_trace(3, "-    catching_eval_instruction(%p) ==> %d\n", pc, x); 
#endif 
    return x; 
  } 
} 
 
/*! @decl mixed `()(function fun, mixed ... args) 
 *! @decl mixed call_function(function fun, mixed ... args) 
 *! 
 *! Call a function. 
 *! 
 *! Calls the function @[fun] with the arguments specified by @[args]. 
 *! 
 *! @seealso 
 *!   @[lfun::`()()] 
 */ 
PMOD_EXPORT void f_call_function(INT32 args) 
{ 
  mega_apply(APPLY_STACK,args,0,0); 
} 
 
/*! @class MasterObject 
 */ 
 
/*! @decl void handle_error(mixed exception) 
 *! 
 *!   Called by the Pike runtime if an exception isn't caught. 
 *! 
 *! @param exception 
 *!   Value that was @[throw()]'n. 
 *! 
 *! @seealso 
 *!   @[describe_backtrace()] 
 */ 
 
/*! @endclass 
 */ 
 
PMOD_EXPORT void call_handle_error(void) 
{ 
  dmalloc_touch_svalue(&throw_value); 
 
  if (Pike_interpreter.svalue_stack_margin > LOW_SVALUE_STACK_MARGIN) { 
    int old_t_flag = Pike_interpreter.trace_level; 
    Pike_interpreter.trace_level = 0; 
    Pike_interpreter.svalue_stack_margin = LOW_SVALUE_STACK_MARGIN; 
    Pike_interpreter.c_stack_margin = LOW_C_STACK_MARGIN; 
    move_svalue (Pike_sp++, &throw_value); 
    mark_free_svalue (&throw_value); 
 
    if (get_master()) {             /* May return NULL at odd times. */ 
      ONERROR tmp; 
      SET_ONERROR(tmp,exit_on_error,"Error in handle_error in master object!"); 
      APPLY_MASTER("handle_error", 1); 
      UNSET_ONERROR(tmp); 
    } 
    else { 
      struct byte_buffer buf = BUFFER_INIT(); 
      fprintf (stderr, "There's no master to handle the error. Dumping it raw:\n"); 
      safe_describe_svalue (&buf, Pike_sp - 1, 0, 0); 
      fprintf(stderr,"%s\n",buffer_get_string(&buf)); 
      buffer_free(&buf); 
      if (TYPEOF(Pike_sp[-1]) == PIKE_T_OBJECT && Pike_sp[-1].u.object->prog) { 
        int fun = find_identifier("backtrace", Pike_sp[-1].u.object->prog); 
        if (fun != -1) { 
          fprintf(stderr, "Attempting to extract the backtrace.\n"); 
          safe_apply_low2(Pike_sp[-1].u.object, fun, 0, 0); 
          safe_describe_svalue(&buf, Pike_sp - 1, 0, 0); 
          pop_stack(); 
          fprintf(stderr,"%s\n",buffer_get_string(&buf)); 
          buffer_free(&buf); 
        } 
      } 
    } 
 
    pop_stack(); 
    Pike_interpreter.svalue_stack_margin = SVALUE_STACK_MARGIN; 
    Pike_interpreter.c_stack_margin = C_STACK_MARGIN; 
    Pike_interpreter.trace_level = old_t_flag; 
  } 
 
  else { 
    free_svalue(&throw_value); 
    mark_free_svalue (&throw_value); 
  } 
} 
 
/* NOTE: This function may only be called from the compiler! */ 
int apply_low_safe_and_stupid(struct object *o, INT32 offset) 
{ 
  JMP_BUF tmp; 
  struct pike_frame *new_frame=alloc_pike_frame(); 
  int ret; 
  volatile int use_dummy_reference = 1; 
  struct program *prog = o->prog; 
  int p_flags = prog->flags; 
  LOW_JMP_BUF *saved_jmpbuf; 
  int fun = -1; 
 
  /* Search for a function that belongs to the current program, 
   * since this is needed for opcodes that use INHERIT_FROM_* 
   * (eg F_EXTERN) to work. 
   */ 
  for (fun = prog->num_identifier_references; fun--;) { 
    if (!prog->identifier_references[fun].inherit_offset) { 
      use_dummy_reference = 0; 
      break; 
    } 
  } 
 
  if (use_dummy_reference) { 
    /* No suitable function was found, so add one. */ 
    struct identifier dummy; 
    struct reference dummy_ref = { 
      0, 0, ID_HIDDEN, 
      PIKE_T_UNKNOWN, { 0, }, 
    }; 
    /* FIXME: Assert that o->prog == Pike_compiler->new_program */ 
    copy_shared_string(dummy.name, empty_pike_string); 
    copy_pike_type(dummy.type, function_type_string); 
    dummy.filename_strno = -1; 
    dummy.linenumber = 0; 
    dummy.run_time_type = PIKE_T_FUNCTION; 
    dummy.identifier_flags = IDENTIFIER_PIKE_FUNCTION|IDENTIFIER_HAS_BODY; 
    dummy.func.offset = offset; 
    dummy.opt_flags = 0; 
    dummy_ref.identifier_offset = prog->num_identifiers; 
    add_to_identifiers(dummy); 
    fun = prog->num_identifier_references; 
    add_to_identifier_references(dummy_ref); 
  } 
 
  /* FIXME: Is this up-to-date with mega_apply? */ 
  new_frame->next = Pike_fp; 
  add_ref(new_frame->current_object = o); 
  add_ref(new_frame->current_program = prog); 
  new_frame->context = prog->inherits; 
  new_frame->locals = Pike_sp; 
  new_frame->expendible_offset=0; 
  new_frame->args = 0; 
  new_frame->num_args=0; 
  new_frame->num_locals=0; 
  new_frame->fun = fun; 
  new_frame->pc = 0; 
  new_frame->current_storage=o->storage; 
 
#ifdef PIKE_DEBUG 
  if (Pike_fp && (new_frame->locals < Pike_fp->locals)) { 
    Pike_fatal("New locals below old locals: %p < %p\n", 
               new_frame->locals, Pike_fp->locals); 
  } 
#endif /* PIKE_DEBUG */ 
 
  Pike_fp = new_frame; 
 
  saved_jmpbuf = Pike_interpreter.catching_eval_jmpbuf; 
  Pike_interpreter.catching_eval_jmpbuf = NULL; 
 
  if(SETJMP(tmp)) 
  { 
    ret=1; 
  }else{ 
    int tmp; 
    new_frame->save_mark_sp=Pike_mark_sp; 
    tmp=eval_instruction(prog->program + offset); 
    Pike_mark_sp=new_frame->save_mark_sp; 
 
#ifdef PIKE_DEBUG 
    if (tmp != -1) 
      Pike_fatal ("Unexpected return value from eval_instruction: %d\n", tmp); 
    if(Pike_sp<Pike_interpreter.evaluator_stack) 
      Pike_fatal("Stack error (simple).\n"); 
#endif 
    ret=0; 
  } 
  UNSETJMP(tmp); 
 
  Pike_interpreter.catching_eval_jmpbuf = saved_jmpbuf; 
 
  if (use_dummy_reference) { 
    /* Pop the dummy identifier. */ 
    free_type(function_type_string); 
    free_string(empty_pike_string); 
    prog->num_identifier_references--; 
    prog->num_identifiers--; 
  } 
 
  assert (new_frame == Pike_fp); 
  LOW_POP_PIKE_FRAME (new_frame); 
 
  return ret; 
} 
 
int safe_apply_low2(struct object *o, int fun, int args, 
                                const char *fun_name) 
{ 
  JMP_BUF recovery; 
  int ret = 0; 
 
  free_svalue(& throw_value); 
  mark_free_svalue (&throw_value); 
  if(SETJMP_SP(recovery, args)) 
  { 
    if(fun_name) call_handle_error(); 
    push_int(0); 
    ret = 0; 
  }else{ 
    if (fun >= 0) { 
      apply_low(o,fun,args); 
    } else if (fun_name) { 
      Pike_error("Cannot call unknown function \"%s\".\n", fun_name); 
    } else { 
      pop_n_elems(args); 
      push_int(0); 
    } 
    ret = 1; 
  } 
  UNSETJMP(recovery); 
  return ret; 
} 
 
PMOD_EXPORT int safe_apply_low(struct object *o, int fun, int args) 
{ 
  return safe_apply_low2(o, fun, args, "Unknown function."); 
} 
 
PMOD_EXPORT int safe_apply(struct object *o, const char *fun, INT32 args) 
{ 
  int id; 
#ifdef PIKE_DEBUG 
  if(!o->prog) Pike_fatal("Apply safe on destructed object.\n"); 
#endif 
  id = find_identifier(fun, o->prog); 
  return safe_apply_low2(o, id, args, fun); 
} 
 
/* Returns nonzero if the function was called in some handler. */ 
int low_unsafe_apply_handler(const char *fun, 
                                         struct object *handler, 
                                         struct object *compat, 
                                         INT32 args) 
{ 
  int i; 
#if 0 
  fprintf(stderr, "low_unsafe_apply_handler(\"%s\", 0x%08p, 0x%08p, %d)\n", 
          fun, handler, compat, args); 
#endif /* 0 */ 
  if (handler && handler->prog && 
      (i = find_identifier(fun, handler->prog)) != -1) { 
    apply_low(handler, i, args); 
  } else if (compat && compat->prog && 
             (i = find_identifier(fun, compat->prog)) != -1) { 
    apply_low(compat, i, args); 
  } else { 
    struct object *master_obj = get_master(); 
    if (master_obj && (i = find_identifier(fun, master_obj->prog)) != -1) 
      apply_low(master_obj, i, args); 
    else { 
      pop_n_elems(args); 
      push_undefined(); 
      return 0; 
    } 
  } 
  return 1; 
} 
 
void low_safe_apply_handler(const char *fun, 
                                        struct object *handler, 
                                        struct object *compat, 
                                        INT32 args) 
{ 
  int i; 
#if 0 
  fprintf(stderr, "low_safe_apply_handler(\"%s\", 0x%08p, 0x%08p, %d)\n", 
          fun, handler, compat, args); 
#endif /* 0 */ 
  if (handler && handler->prog && 
      (i = find_identifier(fun, handler->prog)) != -1) { 
    safe_apply_low2(handler, i, args, fun); 
  } else if (compat && compat->prog && 
             (i = find_identifier(fun, compat->prog)) != -1) { 
    safe_apply_low2(compat, i, args, fun); 
  } else { 
    struct object *master_obj = master(); 
    if ((i = find_identifier(fun, master_obj->prog)) != -1) 
      safe_apply_low2(master_obj, i, args, fun); 
    else { 
      pop_n_elems(args); 
      push_undefined(); 
    } 
  } 
} 
 
PMOD_EXPORT void push_text( const char *x ) 
{ 
    struct svalue *_sp_ = Pike_sp++; 
    SET_SVAL_SUBTYPE(*_sp_, 0); 
    _sp_->u.string=make_shared_string(x); 
    debug_malloc_touch(_sp_->u.string); 
    SET_SVAL_TYPE(*_sp_, PIKE_T_STRING); 
} 
 
PMOD_EXPORT void push_static_text( const char *x ) 
{ 
    struct svalue *_sp_ = Pike_sp++; 
    SET_SVAL_SUBTYPE(*_sp_, 0); 
    _sp_->u.string=make_shared_static_string(x, strlen(x), eightbit); 
    debug_malloc_touch(_sp_->u.string); 
    SET_SVAL_TYPE(*_sp_, PIKE_T_STRING); 
} 
 
/* NOTE: Returns 1 if result on stack, 0 otherwise. */ 
PMOD_EXPORT int safe_apply_handler(const char *fun, 
                                   struct object *handler, 
                                   struct object *compat, 
                                   INT32 args, 
                                   TYPE_FIELD rettypes) 
{ 
  JMP_BUF recovery; 
  int ret; 
 
  STACK_LEVEL_START(args); 
 
#if 0 
  fprintf(stderr, "safe_apply_handler(\"%s\", 0x%08p, 0x%08p, %d)\n", 
          fun, handler, compat, args); 
#endif /* 0 */ 
 
  free_svalue(& throw_value); 
  mark_free_svalue (&throw_value); 
 
  if (SETJMP_SP(recovery, args)) { 
    ret = 0; 
  } else { 
    if (low_unsafe_apply_handler (fun, handler, compat, args) && 
        rettypes && !((1 << TYPEOF(Pike_sp[-1])) & rettypes)) { 
      if ((rettypes & BIT_ZERO) && SAFE_IS_ZERO (Pike_sp - 1)) { 
        pop_stack(); 
        push_int(0); 
      } 
      else { 
        Pike_error("Invalid return value from %s: %O\n", 
                   fun, Pike_sp-1); 
      } 
    } 
 
    ret = 1; 
  } 
 
  UNSETJMP(recovery); 
 
  STACK_LEVEL_DONE(ret); 
 
  return ret; 
} 
 
PMOD_EXPORT void apply_lfun(struct object *o, int lfun, int args) 
{ 
  int fun; 
  if(!o->prog) 
    PIKE_ERROR("destructed object", "Apply on destructed object.\n", 
               Pike_sp, args); 
 
  if ((fun = (int)FIND_LFUN(o->prog, lfun)) < 0) 
    Pike_error("Calling undefined lfun::%s.\n", lfun_names[lfun]); 
 
  apply_low(o, fun, args); 
} 
 
PMOD_EXPORT void apply_shared(struct object *o, 
                  struct pike_string *fun, 
                  int args) 
{ 
  int id = find_shared_string_identifier(fun, o->prog); 
  if (id >= 0) 
    apply_low(o, id, args); 
  else 
    Pike_error("Cannot call unknown function \"%S\".\n", fun); 
} 
 
PMOD_EXPORT void apply(struct object *o, const char *fun, int args) 
{ 
  int id = find_identifier(fun, o->prog); 
  if (id >= 0) 
    apply_low(o, id, args); 
  else 
    Pike_error ("Cannot call unknown function \"%s\".\n", fun); 
} 
 
 
PMOD_EXPORT void apply_svalue(struct svalue *s, INT32 args) 
{ 
  if(TYPEOF(*s) == T_INT) 
  { 
    pop_n_elems(args); 
    push_int(0); 
  }else{ 
    ptrdiff_t expected_stack=Pike_sp-args+1 - Pike_interpreter.evaluator_stack; 
 
    strict_apply_svalue(s,args); 
    if(Pike_sp > (expected_stack + Pike_interpreter.evaluator_stack)) 
    { 
      pop_n_elems(Pike_sp-(expected_stack + Pike_interpreter.evaluator_stack)); 
    } 
    else if(Pike_sp < (expected_stack + Pike_interpreter.evaluator_stack)) 
    { 
      push_int(0); 
    } 
#ifdef PIKE_DEBUG 
    if(Pike_sp < (expected_stack + Pike_interpreter.evaluator_stack)) 
      Pike_fatal("Stack underflow!\n"); 
#endif 
  } 
} 
 
PMOD_EXPORT void safe_apply_svalue(struct svalue *s, int args, int handle_errors) 
{ 
  JMP_BUF recovery; 
  free_svalue(& throw_value); 
  mark_free_svalue (&throw_value); 
  if(SETJMP_SP(recovery, args)) 
  { 
    if(handle_errors) call_handle_error(); 
    push_int(0); 
  }else{ 
    apply_svalue (s, args); 
  } 
  UNSETJMP(recovery); 
} 
 
/* Apply function @[fun] in parent @[depth] levels up with @[args] arguments. 
 */ 
PMOD_EXPORT void apply_external(int depth, int fun, INT32 args) 
{ 
  struct external_variable_context loc; 
 
  loc.o = Pike_fp->current_object; 
  loc.parent_identifier = Pike_fp->fun; 
  if (loc.o->prog) { 
    loc.inherit = INHERIT_FROM_INT(loc.o->prog, loc.parent_identifier); 
 
    find_external_context(&loc, depth); 
 
    apply_low(loc.o, fun + loc.inherit->identifier_level, args); 
  } else { 
    PIKE_ERROR("destructed object", "Apply on parent of destructed object.\n", 
               Pike_sp, args); 
  } 
} 
 
#ifdef PIKE_DEBUG 
void slow_check_stack(void) 
{ 
  struct svalue *s,**m; 
  struct pike_frame *f; 
 
  debug_check_stack(); 
 
  if(Pike_sp > &(Pike_interpreter.evaluator_stack[Pike_stack_size])) 
    Pike_fatal("Svalue stack overflow. " 
               "(%ld entries on stack, stack_size is %ld entries)\n", 
               (long)(Pike_sp - Pike_interpreter.evaluator_stack), 
               (long)Pike_stack_size); 
 
  if(Pike_mark_sp > &(Pike_interpreter.mark_stack[Pike_stack_size])) 
    Pike_fatal("Mark stack overflow.\n"); 
 
  if(Pike_mark_sp < Pike_interpreter.mark_stack) 
    Pike_fatal("Mark stack underflow.\n"); 
 
  for(s=Pike_interpreter.evaluator_stack;s<Pike_sp;s++) { 
    /* NOTE: Freed svalues are allowed on the stack. */ 
    if (TYPEOF(*s) != PIKE_T_FREE) check_svalue(s); 
  } 
 
  s=Pike_interpreter.evaluator_stack; 
  for(m=Pike_interpreter.mark_stack;m<Pike_mark_sp;m++) 
  { 
    if(*m < s) 
      Pike_fatal("Mark stack failure.\n"); 
 
    s=*m; 
  } 
 
  if(s > &(Pike_interpreter.evaluator_stack[Pike_stack_size])) 
    Pike_fatal("Mark stack exceeds svalue stack\n"); 
 
  for(f=Pike_fp;f;f=f->next) 
  { 
    if(f->locals) 
    { 
      if(f->locals < Pike_interpreter.evaluator_stack || 
        f->locals > &(Pike_interpreter.evaluator_stack[Pike_stack_size])) 
      Pike_fatal("Local variable pointer points to FinspÄng.\n"); 
 
      if(f->args < 0 || f->args > Pike_stack_size) 
        Pike_fatal("FEL FEL FEL! HELP!! (corrupted pike_frame)\n"); 
    } 
  } 
} 
#endif 
 
static const char *safe_idname_from_int(struct program *prog, int func) 
{ 
  /* ID_FROM_INT with a thick layer of checks. */ 
  struct reference *ref; 
  struct inherit *inher; 
  struct identifier *id; 
  if (!prog) 
    return "<null program *>"; 
  if (func < 0 || func >= prog->num_identifier_references) 
    return "<offset outside prog->identifier_references>"; 
  if (!prog->identifier_references) 
    return "<null prog->identifier_references>"; 
  ref = prog->identifier_references + func; 
  if (ref->inherit_offset >= prog->num_inherits) 
    return "<offset outside prog->inherits>"; 
  if (!prog->inherits) 
    return "<null prog->inherits>"; 
  inher = prog->inherits + ref->inherit_offset; 
  prog = inher->prog; 
  if (!prog) 
    return "<null inherited prog>"; 
  if (ref->identifier_offset >= prog->num_identifiers) 
    return "<offset outside inherited prog->identifiers>"; 
  if (!prog->identifiers) 
    return "<null inherited prog->identifiers>"; 
  id = prog->identifiers + ref->identifier_offset; 
  if (!id->name) 
    return "<null identifier->name>"; 
  if (id->name->size_shift) 
    return "<wide identifier->name->str>"; 
  /* FIXME: Convert wide string identifiers to narrow strings? */ 
  return id->name->str; 
} 
 
/*: Prints the Pike backtrace for the interpreter context in the given 
 *: thread to stderr, without messing in the internals (doesn't even 
 *: use struct byte_buffer). 
 *: 
 *: This function is intended only for convenient use inside a 
 *: debugger session; it can't be used from inside the code. 
 */ 
void gdb_backtrace ( 
#ifdef PIKE_THREADS 
  THREAD_T thread_id 
#endif 
) 
{ 
  struct pike_frame *f, *of; 
 
#ifdef PIKE_THREADS 
  extern struct thread_state *gdb_thread_state_for_id(THREAD_T); 
  struct thread_state *ts = gdb_thread_state_for_id(thread_id); 
  if (!ts) { 
    fputs ("Not a Pike thread.\n", stderr); 
    return; 
  } 
  f = ts->state.frame_pointer; 
#else 
  f = Pike_fp; 
#endif 
 
  for (of = 0; f; f = (of = f)->next) 
    if (f->refs) { 
      int args, i; 
      char *file = NULL; 
      INT_TYPE line; 
 
      if (f->context) { 
        if (f->pc) 
          file = low_get_line_plain (f->pc, f->context->prog, &line, 0); 
        else 
          file = low_get_program_line_plain (f->context->prog, &line, 0); 
      } 
      if (file) 
        fprintf (stderr, "%s:%ld: ", file, (long)line); 
      else 
        fputs ("unknown program: ", stderr); 
 
      if (f->current_program) { 
        /* FIXME: Wide string identifiers. */ 
        fputs (safe_idname_from_int(f->current_program, f->fun), stderr); 
        fputc ('(', stderr); 
      } 
      else 
        fputs ("unknown function(", stderr); 
 
      if(!f->locals) 
      { 
        args=0; 
      }else{ 
        ptrdiff_t tmp; 
 
        if(of) { 
          tmp = of->locals - f->locals; 
        } else { 
#ifdef PIKE_THREADS 
          tmp = ts->state.stack_pointer - f->locals; 
#else 
          tmp = f->num_args; /* FIXME */ 
#endif 
        } 
        args = (INT32)tmp; 
        args = MAXIMUM(MINIMUM(args, f->num_args),0); 
      } 
 
      for (i = 0; i < args; i++) { 
        struct svalue *arg = f->locals + i; 
 
        switch (TYPEOF(*arg)) { 
          case T_INT: 
            fprintf (stderr, "%ld", (long) arg->u.integer); 
            break; 
 
          case T_TYPE: 
            /* FIXME: */ 
            fputs("type-value", stderr); 
            break; 
 
          case T_STRING: { 
            int i,j=0; 
            fputc ('"', stderr); 
            for(i=0; i < arg->u.string->len && i < 100; i++) 
            { 
              switch(j=index_shared_string(arg->u.string,i)) 
              { 
                case '\n': 
                  fputc ('\\', stderr); 
                  fputc ('n', stderr); 
                  break; 
 
                case '\t': 
                  fputc ('\\', stderr); 
                  fputc ('t', stderr); 
                  break; 
 
                case '\b': 
                  fputc ('\\', stderr); 
                  fputc ('b', stderr); 
                  break; 
 
                case '\r': 
                  fputc ('\\', stderr); 
                  fputc ('r', stderr); 
                  break; 
 
 
                case '"': 
                case '\\': 
                  fputc ('\\', stderr); 
                  fputc (j, stderr); 
                  break; 
 
                default: 
                  if(j>=0 && j<256 && isprint(j)) 
                  { 
                    fputc (j, stderr); 
                    break; 
                  } 
 
                  fputc ('\\', stderr); 
                  fprintf (stderr, "%o", j); 
 
                  switch(index_shared_string(arg->u.string,i+1)) 
                  { 
                    case '0': case '1': case '2': case '3': 
                    case '4': case '5': case '6': case '7': 
                    case '8': case '9': 
                      fputc ('"', stderr); 
                      fputc ('"', stderr); 
                  } 
                  break; 
              } 
            } 
            fputc ('"', stderr); 
            if (i < arg->u.string->len) 
              fprintf (stderr, "+[%ld]", (long) (arg->u.string->len - i)); 
            break; 
          } 
 
          case T_FUNCTION: 
            /* FIXME: Wide string identifiers. */ 
            if(SUBTYPEOF(*arg) == FUNCTION_BUILTIN) 
              fputs (arg->u.efun->name->str, stderr); 
            else if(arg->u.object->prog) 
              fputs (safe_idname_from_int(arg->u.object->prog, 
                                          SUBTYPEOF(*arg)), stderr); 
            else 
              fputc ('0', stderr); 
            break; 
 
          case T_OBJECT: { 
            struct program *p = arg->u.object->prog; 
            if (p && p->num_linenumbers) { 
              file = low_get_program_line_plain (p, &line, 0); 
              fprintf (stderr, "object(%s:%ld)", file, (long)line); 
            } 
            else 
              fputs ("object", stderr); 
            break; 
          } 
 
          case T_PROGRAM: { 
            struct program *p = arg->u.program; 
            if (p->num_linenumbers) { 
              file = low_get_program_line_plain (p, &line, 0); 
              fprintf (stderr, "program(%s:%ld)", file, (long)line); 
            } 
            else 
              fputs ("program", stderr); 
            break; 
          } 
 
          case T_FLOAT: 
            fprintf (stderr, "%f",(double) arg->u.float_number); 
            break; 
 
          case T_ARRAY: 
            fprintf (stderr, "array[%ld]", (long) arg->u.array->size); 
            break; 
 
          case T_MULTISET: 
            fprintf (stderr, "multiset[%ld]", (long) multiset_sizeof (arg->u.multiset)); 
            break; 
 
          case T_MAPPING: 
            fprintf (stderr, "mapping[%ld]", (long) m_sizeof (arg->u.mapping)); 
            break; 
 
          default: 
            fprintf (stderr, "<Unknown %d>", TYPEOF(*arg)); 
        } 
 
        if (i < args - 1) fputs (", ", stderr); 
      } 
      fputs (")\n", stderr); 
    } 
    else 
      fputs ("frame with no references\n", stderr); 
} 
 
/*: Prints the Pike backtraces for the interpreter contexts in all 
 *: Pike threads to stderr, using @[gdb_backtrace]. 
 *: 
 *: This function is intended only for convenient use inside a 
 *: debugger session; it can't be used from inside the program. 
 */ 
void gdb_backtraces() 
{ 
#ifdef PIKE_THREADS 
  extern INT32 gdb_next_thread_state(INT32, struct thread_state **); 
  INT32 i = 0; 
  struct thread_state *ts = 0; 
  while ((i = gdb_next_thread_state (i, &ts)), ts) { 
    fprintf (stderr, "\nTHREAD_ID %p (swapped %s):\n", 
             (void *)(ptrdiff_t)ts->id, ts->swapped ? "out" : "in"); 
    gdb_backtrace (ts->id); 
  } 
#else 
  gdb_backtrace(); 
#endif 
} 
 
PMOD_EXPORT void custom_check_stack(ptrdiff_t amount, const char *fmt, ...) 
{ 
  if (low_stack_check(amount)) { 
    va_list args; 
    va_start(args, fmt); 
    va_error(fmt, args); 
  } 
} 
 
PMOD_EXPORT void low_cleanup_interpret(struct Pike_interpreter_struct *interpreter) 
{ 
#ifdef USE_MMAP_FOR_STACK 
  if(!interpreter->evaluator_stack_malloced) 
  { 
    munmap((char *)interpreter->evaluator_stack, 
           Pike_stack_size*sizeof(struct svalue)); 
    interpreter->evaluator_stack = 0; 
  } 
  if(!interpreter->mark_stack_malloced) 
  { 
    munmap((char *)interpreter->mark_stack, 
           Pike_stack_size*sizeof(struct svalue *)); 
    interpreter->mark_stack = 0; 
  } 
#endif 
 
  if(interpreter->evaluator_stack) 
    free(interpreter->evaluator_stack); 
  if(interpreter->mark_stack) 
    free(interpreter->mark_stack); 
 
  interpreter->mark_stack = 0; 
  interpreter->evaluator_stack = 0; 
  interpreter->mark_stack_malloced = 0; 
  interpreter->evaluator_stack_malloced = 0; 
 
  interpreter->stack_pointer = 0; 
  interpreter->mark_stack_pointer = 0; 
  interpreter->frame_pointer = 0; 
} 
 
PMOD_EXPORT void cleanup_interpret(void) 
{ 
  while(Pike_fp) 
    POP_PIKE_FRAME(); 
 
  reset_evaluator(); 
 
  low_cleanup_interpret(&Pike_interpreter); 
} 
 
void really_clean_up_interpret(void) 
{ 
#ifdef DO_PIKE_CLEANUP 
#if 0 
  struct pike_frame_block *p; 
  int e; 
  for(p=pike_frame_blocks;p;p=p->next) 
    for(e=0;e<128;e++) 
      debug_malloc_dump_references( p->x + e); 
#endif 
  free_callback_list (&evaluator_callbacks); 
  free_all_pike_frame_blocks(); 
  free_all_catch_context_blocks(); 
#endif 
}