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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. 
*/ 
 
    { 
      struct program *p; 
      struct reference *ref; 
      struct pike_frame *new_frame; 
      struct identifier *function; 
 
#ifdef PIKE_DEBUG 
      if (fun < 0) 
        Pike_fatal ("Invalid function offset: %d.\n", fun); 
#endif 
      check_stack(256); 
      check_mark_stack(256); 
 
#ifdef PIKE_DEBUG 
      { 
        static int counter; 
        switch(d_flag) 
        { 
          case 0: 
          case 1: 
          case 2: 
            break; 
          case 3: 
            if(!((counter++ & 7))) 
              do_debug(); 
            break; 
          case 4: 
          default: 
            do_debug(); 
        } 
      } 
#endif 
 
      p=o->prog; 
      if(!p) 
        PIKE_ERROR("destructed object->function", 
              "Cannot call functions in destructed objects.\n", Pike_sp, args); 
 
      if(!(p->flags & PROGRAM_PASS_1_DONE) || (p->flags & PROGRAM_AVOID_CHECK)) 
        PIKE_ERROR("__empty_program() -> function", 
              "Cannot call functions in unfinished objects.\n", Pike_sp, args); 
 
#ifdef PIKE_DEBUG 
      if(fun>=(int)p->num_identifier_references) 
      { 
        fprintf(stderr, "Function index out of range. %ld >= %d\n", 
                (long)fun, (int)p->num_identifier_references); 
        fprintf(stderr,"########Program is:\n"); 
        describe(p); 
        fprintf(stderr,"########Object is:\n"); 
        describe(o); 
        Pike_fatal("Function index out of range.\n"); 
      } 
#endif 
 
      ref = p->identifier_references + fun; 
#ifdef PIKE_DEBUG 
      if(ref->inherit_offset>=p->num_inherits) 
        Pike_fatal("Inherit offset out of range in program.\n"); 
#endif 
 
      /* init a new evaluation pike_frame */ 
      new_frame=alloc_pike_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 
      debug_malloc_touch(new_frame); 
 
      new_frame->next = Pike_fp; 
      new_frame->current_object = o; 
      new_frame->current_program = p; 
      new_frame->context = p->inherits + ref->inherit_offset; 
 
      function = new_frame->context->prog->identifiers + ref->identifier_offset; 
      new_frame->fun = (unsigned INT16)fun; 
 
 
#ifdef PIKE_DEBUG 
        if(Pike_interpreter.trace_level > 9) 
        { 
          fprintf(stderr,"-- ref: inoff=%d idoff=%d flags=%d\n", 
                  ref->inherit_offset, 
                  ref->identifier_offset, 
                  ref->id_flags); 
 
          fprintf(stderr,"-- context: prog->id=%d inlev=%d idlev=%d pi=%d po=%d so=%ld name=%s\n", 
                  new_frame->context->prog->id, 
                  new_frame->context->inherit_level, 
                  new_frame->context->identifier_level, 
                  new_frame->context->parent_identifier, 
                  new_frame->context->parent_offset, 
                  (long)new_frame->context->storage_offset, 
                  new_frame->context->name ? new_frame->context->name->str  : "NULL"); 
          if(Pike_interpreter.trace_level>19) 
          { 
            describe(new_frame->context->prog); 
          } 
        } 
#endif 
 
 
      new_frame->locals = Pike_sp - args; 
      new_frame->args = args; 
      new_frame->pc = 0; 
      new_frame->scope=scope; 
#ifdef PIKE_DEBUG 
      if(scope && new_frame->fun == scope->fun) 
      { 
        Pike_fatal("Que? A function cannot be parented by itself!\n"); 
      } 
#endif 
      frame_set_save_sp(new_frame, save_sp); 
 
      add_ref(new_frame->current_object); 
      add_ref(new_frame->current_program); 
      if(new_frame->scope) add_ref(new_frame->scope); 
#ifdef PIKE_DEBUG 
      if (Pike_fp) { 
 
        if (new_frame->locals < Pike_fp->locals) { 
          Pike_fatal("New locals below old locals: %p < %p\n", 
                     new_frame->locals, Pike_fp->locals); 
        } 
 
        if (d_flag > 1) { 
          /* Liberal use of variables for debugger convenience. */ 
          size_t i; 
          struct svalue *l = Pike_fp->locals; 
          for (i = 0; l + i < Pike_sp; i++) 
            if (TYPEOF(l[i]) != PIKE_T_FREE) 
              debug_check_svalue (l + i); 
        } 
      } 
#endif /* PIKE_DEBUG */ 
 
      Pike_fp = new_frame; 
 
      if(Pike_interpreter.trace_level) 
      { 
        do_trace_function_call(o, function, args); 
      } 
      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(&obj_name)); 
        buffer_free(&obj_name); 
      } 
 
#ifdef PROFILING 
      function->num_calls++; 
      function->recur_depth++; 
#endif 
 
      if(function->func.offset == -1) { 
        new_frame->num_args = args; 
        generic_error(NULL, Pike_sp, args, 
                      "Calling undefined function.\n"); 
      } 
 
      switch(function->identifier_flags & (IDENTIFIER_TYPE_MASK|IDENTIFIER_ALIAS)) 
      { 
      case IDENTIFIER_C_FUNCTION: 
        debug_malloc_touch(Pike_fp); 
        Pike_fp->num_args=args; 
        new_frame->current_storage = o->storage+new_frame->context->storage_offset; 
        new_frame->num_locals=args; 
        FAST_CHECK_THREADS_ON_CALL(); 
        (*function->func.c_fun)(args); 
        break; 
 
      case IDENTIFIER_CONSTANT: 
      { 
        struct svalue *s=&(Pike_fp->context->prog-> 
                           constants[function->func.const_info.offset].sval); 
        debug_malloc_touch(Pike_fp); 
        if(TYPEOF(*s) == T_PROGRAM) 
        { 
          struct object *tmp; 
          FAST_CHECK_THREADS_ON_CALL(); 
          Pike_fp->num_args=args; 
          tmp=parent_clone_object(s->u.program, 
                                  o, 
                                  fun, 
                                  args); 
          push_object(tmp); 
          break; 
        } 
      } 
      /* FALLTHRU */ 
 
      case IDENTIFIER_VARIABLE: 
      { 
        /* FIXME: 
         * Use new-style tail-recursion instead 
         */ 
        debug_malloc_touch(Pike_fp); 
        debug_malloc_touch(o); 
        if(Pike_sp-save_sp-args<=0) 
        { 
          /* Create an extra svalue for tail recursion style call */ 
          Pike_sp++; 
          memmove(Pike_sp-args,Pike_sp-args-1,sizeof(struct svalue)*args); 
#ifdef DEBUG_MALLOC 
          if (args) { 
            int i; 
            /* Note: touch the dead svalue too. */ 
            for (i=args+2; i > 0; i--) { 
              dmalloc_touch_svalue(Pike_sp-i); 
            } 
          } 
#endif /* DEBUG_MALLOC */ 
        }else{ 
          free_svalue(Pike_sp-args-1); 
        } 
        mark_free_svalue (Pike_sp - args - 1); 
        low_object_index_no_free(Pike_sp-args-1,o,fun); 
 
        /* No profiling code for calling variables - Hubbe */ 
        POP_PIKE_FRAME(); 
 
        if(Pike_sp-save_sp-args > (args<<2) + 32) 
        { 
          /* The test above assures these two areas 
           * are not overlapping 
           */ 
          assign_svalues(save_sp, Pike_sp-args, args, BIT_MIXED); 
          pop_n_elems(Pike_sp-save_sp-args); 
        } 
        arg1=(void *)(Pike_sp-args-1); 
        if (PIKE_FN_POPFRAME_ENABLED()) { 
          /* DTrace adjust frame depth */ 
          PIKE_FN_POPFRAME(); 
        } 
        goto apply_svalue; 
      } 
 
      case IDENTIFIER_PIKE_FUNCTION: 
      { 
        int num_args; 
        int num_locals; 
        PIKE_OPCODE_T *pc; 
        FAST_CHECK_THREADS_ON_CALL(); 
 
#ifdef PIKE_DEBUG 
        if (Pike_in_gc > GC_PASS_PREPARE && Pike_in_gc < GC_PASS_FREE) 
          Pike_fatal("Pike code called within gc.\n"); 
    new_frame->num_args = 0; 
    new_frame->num_locals = 0; 
#endif 
 
        debug_malloc_touch(Pike_fp); 
        new_frame->current_storage = o->storage+new_frame->context->storage_offset; 
        pc=new_frame->context->prog->program + function->func.offset; 
 
        new_frame->save_mark_sp=Pike_mark_sp; 
        new_frame->pc = pc 
#ifdef ENTRY_PROLOGUE_SIZE 
          + ENTRY_PROLOGUE_SIZE 
#endif /* ENTRY_PROLOGUE_SIZE */ 
          ; 
 
        return new_frame->pc; 
      } 
 
      default: 
        if (IDENTIFIER_IS_ALIAS(function->identifier_flags)) { 
          POP_PIKE_FRAME(); 
          do { 
            struct external_variable_context loc; 
            loc.o = o; 
            loc.inherit = INHERIT_FROM_INT(p, fun); 
            loc.parent_identifier = 0; 
            find_external_context(&loc, function->func.ext_ref.depth); 
            fun = function->func.ext_ref.id; 
            p = (o = loc.o)->prog; 
            function = ID_FROM_INT(p, fun); 
          } while (IDENTIFIER_IS_ALIAS(function->identifier_flags)); 
          if (PIKE_FN_POPFRAME_ENABLED()) { 
            /* DTrace adjust frame depth */ 
            PIKE_FN_POPFRAME(); 
          } 
          goto apply_low; 
        } 
#ifdef PIKE_DEBUG 
        Pike_fatal("Unknown identifier type.\n"); 
#endif 
      } 
      POP_PIKE_FRAME(); 
    }