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/* 
|| This file is part of Pike. For copyright information see COPYRIGHT. 
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING 
|| for more information. 
*/ 
 
#ifndef SVALUE_H 
#define SVALUE_H 
 
#include "global.h" 
#include "buffer.h" 
 
#ifndef STRUCT_CALLABLE_DECLARED 
#define STRUCT_CALLABLE_DECLARED 
struct callable; 
#endif 
 
#ifndef STRUCT_NODE_S_DECLARED 
#define STRUCT_NODE_S_DECLARED 
struct node_s; 
typedef struct node_s node; 
#endif 
 
struct processing 
{ 
  struct processing *next; 
  void *pointer_a, *pointer_b; 
}; 
 
struct ref_dummy; 
 
/** the union of possible types in an svalue. 
*/ 
union anything 
{ 
  INT_TYPE integer;             /**< Union initializations assume this first. */ 
  struct callable *efun; 
  struct array *array; 
  struct mapping *mapping; 
  struct multiset *multiset; 
  struct object *object; 
  struct program *program; 
  struct pike_string *string; 
  struct pike_type *type; 
  INT32 *refs; 
  struct ref_dummy *dummy; 
  FLOAT_TYPE float_number; 
  int identifier;           /**< Used with T_OBJ_INDEX. */ 
  struct svalue *lval;              /**< Used with T_SVALUE_PTR. */ 
  void *ptr; 
#ifdef DEBUG_MALLOC 
  char *loc;                        /* Only used for free svalue debugging. */ 
#endif 
}; 
 
/* The native types. 
 * 
 * Note that PIKE_T_INT is zero so that cleared memory 
 * is filled with zeroes. 
 */ 
enum PIKE_TYPE { 
    PIKE_T_INT=0, 
    PIKE_T_FLOAT=1, 
 
/* NB: The reference counted types all have bit 4 set. */ 
    PIKE_T_ARRAY=8, 
    PIKE_T_MAPPING=9, 
    PIKE_T_MULTISET=10, 
    PIKE_T_OBJECT=11, 
    PIKE_T_FUNCTION=12, 
    PIKE_T_PROGRAM=13, 
    PIKE_T_STRING=14, 
    PIKE_T_TYPE=15, 
 
/* The types above are valid types in svalues. 
 * The following are only used by the internal systems. 
 */ 
 
/* NB: 6 & 7 below are selected for easy backward compat with Pike 7.8. */ 
    PIKE_T_ZERO= 6,     /**< Can return 0, but nothing else */ 
    T_UNFINISHED=7, 
 
/* 
 * NOTE: The following types may show up on the stack, but are NOT 
 *       reference counted there. There they are mainly used for 
 *       lvalues. They MUST NOT have a value that has bit 3 (8) set. 
 */ 
 
    T_VOID=       16, /**< Can't return any value. Also used on stack to fill out the second 
 * svalue on an lvalue when it isn't used. */ 
 
    T_MANY=       17, 
 
    PIKE_T_INT_UNTYPED= 18, /* Optimization of int type size */ 
 
    PIKE_T_GET_SET= 32, /* Getter setter. 
                         * Only valid in struct identifier */ 
 
 
/* Type to put in freed svalues. Only the type field in such svalues 
 * is defined. Freeing a PIKE_T_FREE svalue is allowed and does 
 * nothing. mark_free_svalue() is preferably used to set this type. 
 * 
 * Traditionally T_INT has been used for this without setting a proper 
 * subtype; if T_INT is to be used then the subtype must be set to 
 * NUMBER_NUMBER. 
 * 
 * PIKE_T_FREE svalues are recorded as BIT_INT in type hint fields. 
 */ 
    PIKE_T_FREE=19, 
 
/** svalue.u.lval points to an svalue. Primarily used in lvalues on 
 * stack, but can also occur in arrays containing lvalue pairs. 
 */ 
    T_SVALUE_PTR=20, 
 
/** svalue.u.identifer is an identifier index in an object. Primarily 
 * used in lvalues on stack, but can also occur in arrays containing 
 * lvalue pairs. 
 */ 
    T_OBJ_INDEX=21, 
    T_ARRAY_LVALUE=22, 
 
/* No types above this value should appear on the stack. */ 
    PIKE_T_STACK_MAX=   T_ARRAY_LVALUE, 
}; 
 
/** 
 */ 
struct svalue 
{ 
  union { 
    struct { 
      /* NB: Ought to be "enum PIKE_TYPE type:16", but then the 
       *     machine code generator can't use the &-operator to 
       *     get the field offset. On the other hand the offset 
       *     should always be zero, so... 
       */ 
      unsigned short type; /**< the data type, see PIKE_T_... */ 
      unsigned short subtype; /**< used to store the zero type, among others */ 
    } t; 
    enum PIKE_TYPE named_type:16; 
 
#if PIKE_BYTEORDER == 1234 
    ptrdiff_t type_subtype; 
#else 
    /* For big-endian 64-bit architectures we don't want to require 
     * 64-bit constants when setting the type_subtype field. 
     */ 
    INT32 type_subtype; 
#if SIZEOF_CHAR_P == 8 
    INT32 pad__; 
#endif 
#endif 
  } tu; 
  union anything u; /**< contains the value */ 
}; 
 
#define PIKE_TYPEOF(SVAL)     ((SVAL).tu.t.type) 
#define PIKE_SUBTYPEOF(SVAL)  ((SVAL).tu.t.subtype) 
#define TYPEOF(SVAL)          PIKE_TYPEOF(SVAL) 
#define SUBTYPEOF(SVAL)               PIKE_SUBTYPEOF(SVAL) 
 
#define SET_SVAL_TYPE(SVAL, TYPE)     (TYPEOF(SVAL) = (TYPE)) 
#define SET_SVAL_SUBTYPE(SVAL, TYPE)  (SUBTYPEOF(SVAL) = (TYPE)) 
 
#if PIKE_BYTEORDER == 1234 
#define TYPE_SUBTYPE(X,Y) ((unsigned int)(X)|((unsigned int)(Y)<<16)) 
#else 
#define TYPE_SUBTYPE(X,Y) ((unsigned int)(Y)|((unsigned int)(X)<<16)) 
#endif 
 
#define SET_SVAL_TYPE_SUBTYPE(SVAL, TYPE, SUBTYPE) \ 
  ((SVAL).tu.type_subtype = TYPE_SUBTYPE(TYPE,SUBTYPE)) 
/* Setting the entire type_subtype field is probably faster than 
 * just setting the type field. 
 */ 
#define SET_SVAL_TYPE_DC(SVAL, TYPE)  SET_SVAL_TYPE_SUBTYPE(SVAL, TYPE, 0) 
 
#define SET_SVAL(SVAL, TYPE, SUBTYPE, FIELD, EXPR) do { \ 
    /* Set the type afterwards to avoid a clobbered     \ 
     * svalue in case EXPR throws. */                   \ 
    struct svalue * __sv_ptr = &( SVAL );               \ 
    __sv_ptr->u.FIELD = (EXPR);                         \ 
    SET_SVAL_TYPE_SUBTYPE(*__sv_ptr, TYPE, SUBTYPE);    \ 
  } while(0) 
 
/* 
*/ 
#define INVALIDATE_SVAL(SVAL) SET_SVAL_TYPE_DC(SVAL, 99) /* an invalid type */ 
 
 
/* 
 * The following types are only used in compile-time types and 
 * as markers in struct identifier. 
 */ 
 
/* should only be used while compiling */ 
 
#define PIKE_T_ATTRIBUTE 238  /* Attribute node. */ 
#define PIKE_T_NSTRING 239    /* Narrow string. Only for serialization. */ 
#define PIKE_T_RING 240 
#define PIKE_T_NAME 241               /**< Named type. */ 
#define PIKE_T_SCOPE 243      /**< Not supported yet */ 
#define PIKE_T_TUPLE 244      /**< Not supported yet */ 
#define T_ASSIGN 245 
#define T_DELETED 246 
#define PIKE_T_UNKNOWN 247 
#define PIKE_T_AUTO 248 
 
 
#define PIKE_T_MIXED 251 
#define T_NOT 253 
#define T_AND 254 
#define T_OR 255 
 
/* This flag is only valid in struct reference, and corresponds 
 * to struct identifier identifier_flags IDENTIFIER_NO_THIS_REF. */ 
#define PIKE_T_NO_REF_FLAG    256 
#define PIKE_T_NO_REF_OBJECT  (PIKE_T_NO_REF_FLAG|PIKE_T_OBJECT) 
#define PIKE_T_NO_REF_FUNCTION        (PIKE_T_NO_REF_FLAG|PIKE_T_FUNCTION) 
#define PIKE_T_NO_REF_MIXED   (PIKE_T_NO_REF_FLAG|PIKE_T_MIXED) 
#define PIKE_T_NO_REF_INT     (PIKE_T_NO_REF_FLAG|PIKE_T_INT) 
#define PIKE_T_NO_REF_FLOAT   (PIKE_T_NO_REF_FLAG|PIKE_T_FLOAT) 
 
/* These are only used together with describe() and friends. */ 
#define T_STORAGE 10000 
#define T_MAPPING_DATA 10001 
#define T_PIKE_FRAME 10002 
#define T_MULTISET_DATA 10003 
#define T_STRUCT_CALLABLE 10004 
 
/* NOTE: The t* macros below currently use the old type encoding 
 *       to be compatible with __parse_pike_type() in older 
 *       versions of Pike. 
 */ 
#define tArr(VAL) "\000" VAL 
#define tArray tArr(tMix) 
#define tMap(IND,VAL) "\001" IND VAL 
#define tMapping tMap(tMix,tMix) 
#define tSet(IND) "\002" IND 
#define tMultiset tSet(tMix) 
#define tObj "\003\000\000\000\000\000" 
 
#define tFuncV(ARGS,REST,RET) MagictFuncV(RET,REST,ARGS) 
#define tFunc(ARGS,RET) MagictFunc(RET,ARGS) 
 
#define tTuple(T1,T2)         "\364" T1 T2 
#define tTriple(T1,T2,T3)     tTuple(T1, tTuple(T2, T3)) 
#define tQuad(T1,T2,T3,T4)    tTriple(tTuple(T1, T2), T3, T4) 
 
/* These two magic funcions are used to make MSVC++ work 
 * even if 'ARGS' is empty. 
 */ 
#define MagictFuncV(RET,REST,ARGS) "\004" ARGS "\021" REST RET 
#define MagictFunc(RET,ARGS) tFuncV(ARGS "", tVoid, RET) 
#define tFunction tFuncV("" ,tOr(tZero,tVoid),tOr(tMix,tVoid)) 
#define tNone "" 
#define tPrg(X) "\005" X 
#define tProgram(X) "\005" X 
#define tStr "\006" 
#define tString "\006" 
#define tNStr(T) "\357" T 
#define tStr0 "\357" tZero 
#define tStr7 "\357" "\010\000\000\000\000\000\000\000\177" 
#define tStr8 "\357" "\010\000\000\000\000\000\000\000\377" 
#define tStr16 "\357" "\010\000\000\000\000\000\000\377\377" 
#define tStr32 "\006" 
#define tType(T) "\007" T 
#define tInt "\022" 
#define tInt0 "\010\000\000\000\000\000\000\000\000" 
#define tInt1 "\010\000\000\000\001\000\000\000\001" 
#define tInt2 "\010\000\000\000\002\000\000\000\002" 
#define tInt01 "\010\000\000\000\000\000\000\000\001" 
#define tInt02 "\010\000\000\000\000\000\000\000\002" 
#define tInt03 "\010\000\000\000\000\000\000\000\003" 
#define tInt04 "\010\000\000\000\000\000\000\000\004" 
#define tInt05 "\010\000\000\000\000\000\000\000\005" 
#define tInt06 "\010\000\000\000\000\000\000\000\006" 
#define tInt07 "\010\000\000\000\000\000\000\000\007" 
#define tInt08 "\010\000\000\000\000\000\000\000\010" 
#define tInt09 "\010\000\000\000\000\000\000\000\011" 
#define tIntPos "\010\000\000\000\000\177\377\377\377" 
#define tIntNeg "\010\200\000\000\000\000\000\000\000" 
#define tInt1Plus "\010\000\000\000\001\177\377\377\377" 
#define tInt2Plus "\010\000\000\000\002\177\377\377\377" 
#define tIntMinus "\010\200\000\000\000\377\377\377\377" 
#define tInt_10 "\010\377\377\377\377\000\000\000\000" 
#define tInt_11 "\010\377\377\377\377\000\000\000\001" 
#define tByte "\010\000\000\000\000\000\000\000\377" 
#define tWord "\010\000\000\000\000\000\000\377\377" 
#define tFlt "\011" 
#define tFloat "\011" 
 
#define tZero "\016" 
#define tVoid "\020" 
#define tVar(X) #X 
#define tSetvar(X,Y) "\365" #X Y 
#define tScope(X,T) "\363" #X Y 
#define tNot(X) "\375" X 
#define tAnd(X,Y) "\376" X Y 
#define tOr(X,Y) "\377" X Y 
#define tOr3(X,Y,Z) tOr(X,tOr(Y,Z)) 
#define tOr4(X,Y,Z,A) tOr(X,tOr(Y,tOr(Z,A))) 
#define tOr5(X,Y,Z,A,B) tOr(X,tOr(Y,tOr(Z,tOr(A,B)))) 
#define tOr6(X,Y,Z,A,B,C) tOr(X,tOr(Y,tOr(Z,tOr(A,tOr(B,C))))) 
#define tOr7(X,Y,Z,A,B,C,D) tOr(X,tOr(Y,tOr(Z,tOr(A,tOr(B,tOr(C,D)))))) 
#define tOr8(A,B,C,D,E,F,G,H) tOr(A,tOr7(B,C,D,E,F,G,H)) 
#define tOr9(A,B,C,D,E,F,G,H,I) tOr(A,tOr8(B,C,D,E,F,G,H,I)) 
#define tMix "\373" 
#define tMixed "\373" 
#define tComplex tOr6(tArray,tMapping,tMultiset,tObj,tFunction,tPrg(tObj)) 
#define tStringIndicable tOr5(tMapping,tObj,tFunction,tPrg(tObj),tMultiset) 
#define tRef tOr(tString,tComplex) 
#define tIfnot(X,Y) tAnd(tNot(X),Y) 
#define tAny tOr(tVoid,tMix) 
#define tAttr(X,Y) "\356\0" X "\0" Y 
#define tName(X,Y) "\361\0" X "\0" Y 
#if PIKE_BYTEORDER == 1234 
/* Little endian */ 
#define tAttr1(X,Y) "\356\5" X "\0\0" Y 
#define tAttr2(X,Y) "\356\6" X "\0\0\0\0" Y 
#define tName1(X,Y) "\361\5" X "\0\0" Y 
#define tName2(X,Y) "\361\6" X "\0\0\0\0" Y 
#else /* PIKE_BYTEORDER != 1234 */ 
/* Big endian */ 
#define tAttr1(X,Y) "\356\1" X "\0\0" Y 
#define tAttr2(X,Y) "\356\2" X "\0\0\0\0" Y 
#define tName1(X,Y) "\361\1" X "\0\0" Y 
#define tName2(X,Y) "\361\2" X "\0\0\0\0" Y 
#endif /* PIKE_BYTEORDER == 1234 */ 
 
/* Some convenience macros for common attributes. */ 
#define tSprintfFormat(X)     tAttr("sprintf_format", X) 
#define tSprintfArgs(X)               tAttr("sprintf_args", X) 
#define tDeprecated(X)                tAttr("deprecated", X) 
#define tUtf8Str              tAttr("utf8", tStr8) 
 
#define tSimpleCallable tOr3(tArray,tFunction,tObj) 
#define tCallable tOr3(tArr(tSimpleCallable),tFunction,tObj) 
 
#define BIT_ARRAY (1<<PIKE_T_ARRAY) 
#define BIT_MAPPING (1<<PIKE_T_MAPPING) 
#define BIT_MULTISET (1<<PIKE_T_MULTISET) 
#define BIT_OBJECT (1<<PIKE_T_OBJECT) 
#define BIT_FUNCTION (1<<PIKE_T_FUNCTION) 
#define BIT_PROGRAM (1<<PIKE_T_PROGRAM) 
#define BIT_STRING (1<<PIKE_T_STRING) 
#define BIT_TYPE (1<<PIKE_T_TYPE) 
#define BIT_INT (1<<PIKE_T_INT) 
#define BIT_FLOAT (1<<PIKE_T_FLOAT) 
 
#define BIT_ZERO (1<<PIKE_T_ZERO) 
 
/** Used to signify that the type field hasn't been set according to 
 * reality. */ 
#define BIT_UNFINISHED (1 << T_UNFINISHED) 
 
/** This is only used in typechecking to signify that this 
 * argument may be omitted. 
 */ 
#define BIT_VOID (1 << T_VOID) 
 
/** This is used in typechecking to signify that the rest of the 
 * arguments have to be of this type. 
 */ 
#define BIT_MANY (1 << T_MANY) 
 
#define BIT_NOTHING 0 
#define BIT_MIXED 0xff7f 
#define BIT_BASIC (BIT_INT|BIT_FLOAT|BIT_STRING|BIT_TYPE) 
#define BIT_COMPLEX (BIT_ARRAY|BIT_MULTISET|BIT_OBJECT|BIT_PROGRAM|BIT_MAPPING|BIT_FUNCTION) 
#define BIT_CALLABLE (BIT_FUNCTION|BIT_PROGRAM|BIT_ARRAY|BIT_OBJECT) 
#define BIT_REF_TYPES (BIT_STRING|BIT_TYPE|BIT_COMPLEX) 
 
/* Max type which contains svalues */ 
#define MAX_COMPLEX PIKE_T_PROGRAM 
/* Min type with ref count */ 
#define MIN_REF_TYPE PIKE_T_ARRAY 
/* Max type handled by svalue primitives */ 
#define MAX_TYPE PIKE_T_TYPE 
 
#define REFCOUNTED_TYPE(T)    (((T) & ~(MIN_REF_TYPE - 1)) == MIN_REF_TYPE) 
 
#define NUMBER_NUMBER 0 
#define NUMBER_UNDEFINED 1 
#define NUMBER_DESTRUCTED 2 
 
#define FUNCTION_BUILTIN USHRT_MAX 
 
extern PMOD_EXPORT const  struct svalue svalue_undefined, svalue_int_zero; 
extern PMOD_EXPORT const  struct svalue svalue_int_one; 
 
/* 
 * Storage struct for a trampoline object 
 * (not a part of the program type) 
 */ 
struct pike_trampoline 
{ 
  struct pike_frame *frame; 
  INT32 func; 
}; 
 
/* NB: From builtin.cmod. */ 
extern struct program *pike_trampoline_program; 
 
#define is_gt(a,b) is_lt(b,a) 
#define is_ge(a,b) is_le(b,a) 
 
/* SAFE_IS_ZERO is compatible with the old IS_ZERO, but you should 
 * consider using UNSAFE_IS_ZERO instead, since exceptions thrown from 
 * `! functions will be propagated correctly then. */ 
#define UNSAFE_IS_ZERO(X) (PIKE_TYPEOF(*(X))==PIKE_T_INT?(X)->u.integer==0:(1<<PIKE_TYPEOF(*(X)))&(BIT_OBJECT|BIT_FUNCTION)?!complex_svalue_is_true(X):0) 
#define SAFE_IS_ZERO(X) (PIKE_TYPEOF(*(X))==PIKE_T_INT?(X)->u.integer==0:(1<<PIKE_TYPEOF(*(X)))&(BIT_OBJECT|BIT_FUNCTION)?!safe_svalue_is_true(X):0) 
 
#define IS_UNDEFINED(X) (check_svalue (X), PIKE_TYPEOF(*(X))==PIKE_T_INT&&PIKE_SUBTYPEOF(*(X))==NUMBER_UNDEFINED) 
 
#define IS_DESTRUCTED(X)                                                \ 
  ((PIKE_TYPEOF(*(X)) == PIKE_T_OBJECT && !(X)->u.object->prog) ||      \ 
 (PIKE_TYPEOF(*(X)) == PIKE_T_FUNCTION &&                               \ 
  PIKE_SUBTYPEOF(*(X)) != FUNCTION_BUILTIN                              \ 
  && (!(X)->u.object->prog                                              \ 
      || ((X)->u.object->prog == pike_trampoline_program                \ 
          && !((struct pike_trampoline *)(X)->u.object->storage)        \ 
          ->frame->current_object->prog                                 \ 
          && PIKE_SUBTYPEOF(*(X)) ==                                    \ 
          QUICK_FIND_LFUN(pike_trampoline_program, LFUN_CALL))))) 
 
/* var MUST be a variable!!! */ 
#define safe_check_destructed(var) do{ \ 
    if(IS_DESTRUCTED(var))             \ 
      var=&svalue_int_zero;            \ 
  }while(0) 
 
/* FIXME: Is this actually used for functions? */ 
#define check_short_destructed(U,T) \ 
do{ \ 
  union anything *_u=(U); \ 
  if(( (1<<(T)) & (BIT_OBJECT | BIT_FUNCTION) ) && \ 
     _u->object && !_u->object->prog) { \ 
    free_object(_u->object); \ 
    _u->object = 0; \ 
  } \ 
}while(0) 
 
 
#define add_ref(X) ((void)((X)->refs++)) 
#define sub_ref(X) (--(X)->refs > 0) 
 
#ifdef PIKE_DEBUG 
PMOD_EXPORT extern void describe(void *); /* defined in gc.c */ 
PMOD_EXPORT extern const char msg_type_error[]; 
PMOD_EXPORT extern const char msg_assign_svalue_error[]; 
 
#define IS_INVALID_TYPE(T) is_invalid_stack_type(T) 
 
#define check_type(T) do {                                            \ 
    TYPE_T typ_ = (T);                                                  \ 
    if (IS_INVALID_TYPE (typ_)) Pike_fatal(msg_type_error, typ_);       \ 
  } while (0) 
 
#define check_svalue_type(S) do {                                     \ 
    const struct svalue *sval_ = (S);                                   \ 
    TYPE_T typ_ = PIKE_TYPEOF(*sval_);                                  \ 
    if (IS_INVALID_TYPE (typ_)) debug_svalue_type_error (sval_);        \ 
  } while (0) 
 
#define check_svalue(S) debug_check_svalue(dmalloc_check_svalue(S,DMALLOC_LOCATION())) 
 
void low_thorough_check_short_svalue (const union anything *u, TYPE_T type); 
#define thorough_check_short_svalue(U, T) do {                                \ 
    union anything *anyth_ = (U);                                       \ 
    TYPE_T typ_ = (T);                                                  \ 
    check_short_svalue (anyth_, typ_);                                  \ 
    if (d_flag <= 50) /* Done directly by check_svalue otherwise. */    \ 
      if (REFCOUNTED_TYPE(typ_))                                        \ 
        low_thorough_check_short_svalue (anyth_, typ_);                 \ 
  } while (0) 
#define thorough_check_svalue(S) do {                                 \ 
    struct svalue *sval_ = (S);                                         \ 
    check_svalue (sval_);                                               \ 
    if (d_flag <= 50) /* Done directly by check_svalue otherwise. */    \ 
      if (REFCOUNTED_TYPE(PIKE_TYPEOF(*sval_)))                         \ 
        low_thorough_check_short_svalue (&sval_->u, PIKE_TYPEOF(*sval_)); \ 
  } while (0) 
 
void check_short_svalue(const union anything *u, TYPE_T type); 
PMOD_EXPORT void debug_svalue_type_error (const struct svalue *s); 
PMOD_EXPORT int is_invalid_stack_type(unsigned int t); 
PMOD_EXPORT void debug_check_svalue(const struct svalue *s); 
void debug_check_type_hint (const struct svalue *svals, size_t num, TYPE_FIELD type_hint); 
PMOD_EXPORT void real_gc_mark_external_svalues(const struct svalue *s, ptrdiff_t num, 
                                               const char *place); 
 
PMOD_EXPORT extern const char msg_sval_obj_wo_refs[]; 
#define check_refs(S) do {                                            \ 
    if(REFCOUNTED_TYPE(PIKE_TYPEOF(*(S))) &&                            \ 
       (!(S)->u.refs || (S)->u.refs[0] < 0)) {                          \ 
   fprintf (stderr, "%s", msg_sval_obj_wo_refs);                        \ 
   describe((S)->u.refs);                                               \ 
   Pike_fatal("%s", msg_sval_obj_wo_refs);                              \ 
 } }while(0) 
 
PMOD_EXPORT extern const char msg_ssval_obj_wo_refs[]; 
#define check_refs2(S,T) do { \ 
if(REFCOUNTED_TYPE(T) && (S)->refs && (S)->refs[0] <= 0) {\ 
  fprintf (stderr, "%s", msg_ssval_obj_wo_refs);           \ 
  describe((S)->refs);                                     \ 
  Pike_fatal("%s", msg_ssval_obj_wo_refs);                 \ 
} }while(0) 
 
#define check_type_hint(SVALS, NUM, TYPE_HINT)                                \ 
  debug_check_type_hint ((SVALS), (NUM), (TYPE_HINT)) 
 
#ifdef DEBUG_MALLOC 
static inline struct svalue PIKE_UNUSED_ATTRIBUTE *dmalloc_check_svalue(struct svalue *s, char *l) 
{ 
  if(s && REFCOUNTED_TYPE(PIKE_TYPEOF(*s))) 
    debug_malloc_update_location(s->u.refs,l); 
  return s; 
} 
 
static inline struct svalue PIKE_UNUSED_ATTRIBUTE *dmalloc_check_svalues(struct svalue *s, size_t num, char *l) 
{ 
  while (num--) dmalloc_check_svalue (s + num, l); 
  return s; 
} 
 
static inline union anything PIKE_UNUSED_ATTRIBUTE *dmalloc_check_union(union anything *u,int type, char * l) 
{ 
  if(u && REFCOUNTED_TYPE(type)) 
    debug_malloc_update_location(u->refs,l); 
  return u; 
} 
 
#undef add_ref 
#define add_ref(X) (((INT32 *)debug_malloc_update_location( &((X)->refs), DMALLOC_NAMED_LOCATION(" add_ref")))[0]++) 
#undef sub_ref 
#define sub_ref(X) (--((INT32 *)debug_malloc_update_location( &((X)->refs), DMALLOC_NAMED_LOCATION(" sub_ref")))[0] > 0) 
 
#else  /* !DEBUG_MALLOC */ 
#define dmalloc_check_svalue(S,L) (S) 
#define dmalloc_check_svalues(S,L,N) (S) 
#define dmalloc_check_union(U,T,L) (U) 
#endif        /* !DEBUG_MALLOC */ 
 
/* To be used for type checking in macros. */ 
static inline struct array PIKE_UNUSED_ATTRIBUTE *pass_array (struct array *a) {return a;} 
static inline struct mapping PIKE_UNUSED_ATTRIBUTE *pass_mapping (struct mapping *m) {return m;} 
static inline struct multiset PIKE_UNUSED_ATTRIBUTE *pass_multiset (struct multiset *l) {return l;} 
static inline struct object PIKE_UNUSED_ATTRIBUTE *pass_object (struct object *o) {return o;} 
static inline struct program PIKE_UNUSED_ATTRIBUTE *pass_program (struct program *p) {return p;} 
static inline struct pike_string PIKE_UNUSED_ATTRIBUTE *pass_string (struct pike_string *s) {return s;} 
static inline struct pike_type PIKE_UNUSED_ATTRIBUTE *pass_type (struct pike_type *t) {return t;} 
static inline struct callable PIKE_UNUSED_ATTRIBUTE *pass_callable (struct callable *c) {return c;} 
 
#else  /* !PIKE_DEBUG */ 
 
#define check_svalue(S) ((void) 0) 
#define check_short_svalue(U, T) ((void) 0) 
#define check_type(T) do {} while (0) 
#define check_svalue_type(S) do {} while (0) 
#define check_refs(S) do {} while (0) 
#define check_refs2(S,T) do {} while (0) 
#define check_type_hint(SVALS, NUM, TYPE_HINT) ((void) 0) 
#define dmalloc_check_svalue(S,L) (S) 
#define dmalloc_check_svalues(S,L,N) (S) 
#define dmalloc_check_union(U,T,L) (U) 
 
#define pass_array(A) (A) 
#define pass_mapping(M) (M) 
#define pass_multiset(L) (L) 
#define pass_object(O) (O) 
#define pass_program(P) (P) 
#define pass_string(S) (S) 
#define pass_type(T) (T) 
#define pass_callable(C) (C) 
 
#endif        /* !PIKE_DEBUG */ 
 
/* This marks an svalue as free. After this it may only be used as 
 * input to the svalue free functions (which do nothing with it). Only 
 * the type field is defined (see PIKE_T_FREE above). */ 
#define mark_free_svalue(X) do {                                      \ 
    struct svalue *_X__ = (X);                                          \ 
    DO_IF_DMALLOC (                                                     \ 
      _X__->u.loc = " " __FILE__ ":" DEFINETOSTR (__LINE__);            \ 
      _X__->u.loc++; /* Attempt to achieve an odd address. */           \ 
    );                                                                  \ 
    PIKE_MEM_WO(*_X__);                                                 \ 
    SET_SVAL_TYPE(*_X__, PIKE_T_FREE);                                  \ 
  } while (0) 
 
/* This is a debug macro to assert that an svalue is free and 
 * shouldn't be read at all until it's overwritten. As opposed to 
 * mark_free_svalue, it is not valid input to the svalue free 
 * functions and no field in it is defined. */ 
#define assert_free_svalue(X) do {                                    \ 
    DO_IF_DEBUG (                                                       \ 
      struct svalue *_X__ = (X);                                        \ 
      SET_SVAL_TYPE(*_X__, PIKE_T_UNKNOWN);                             \ 
      DO_IF_DMALLOC (                                                   \ 
        _X__->u.loc = " " __FILE__ ":" DEFINETOSTR (__LINE__);          \ 
        _X__->u.loc++; /* Attempt to achieve an odd address. */         \ 
      );                                                                \ 
      DO_IF_NOT_DMALLOC (_X__->u.ptr = (void *) -1);                    \ 
      PIKE_MEM_WO (*_X__);                                              \ 
    );                                                                  \ 
  } while (0) 
 
#define swap_svalues(X,Y)  do {               \ 
  struct svalue *_a=(X);                                \ 
  struct svalue *_b=(Y);                                \ 
  struct svalue _tmp;                                   \ 
  dmalloc_touch_svalue(_a);                             \ 
  dmalloc_touch_svalue(_b);                             \ 
  _tmp=*_a; *_a=*_b; *_b=_tmp;                          \ 
}while(0) 
 
/* Handles PIKE_T_FREE. */ 
#define free_svalue(X) do {                           \ 
  struct svalue *_s=(X);                                        \ 
  DO_IF_DEBUG (                                                 \ 
    if (PIKE_TYPEOF(*_s) != PIKE_T_FREE) {                      \ 
      check_svalue_type(_s);                                    \ 
      check_refs(_s);                                           \ 
    }                                                           \ 
  );                                                            \ 
  if (!REFCOUNTED_TYPE(PIKE_TYPEOF(*_s)))                       \ 
    assert_free_svalue (_s);                                    \ 
  else {                                                        \ 
    DO_IF_DEBUG (                                               \ 
      DO_IF_PIKE_CLEANUP (                                      \ 
        if (gc_external_refs_zapped)                            \ 
          gc_check_zapped (_s->u.ptr, PIKE_TYPEOF(*_s), __FILE__, __LINE__))); \ 
    if (sub_ref(_s->u.dummy) <=0)                               \ 
      really_free_svalue(_s);                                   \ 
    else                                                        \ 
      assert_free_svalue (_s);                                  \ 
  }                                                             \ 
}while(0) 
 
#define free_short_svalue(X,T) do {                           \ 
  union anything *_s=(X); TYPE_T _t=(T);                                \ 
  check_type(_t); check_refs2(_s,_t);                                   \ 
  if(REFCOUNTED_TYPE(_t) && _s->refs) {                                 \ 
    DO_IF_DEBUG (                                                       \ 
      DO_IF_PIKE_CLEANUP (                                              \ 
        if (gc_external_refs_zapped)                                    \ 
          gc_check_zapped (_s->ptr, _t, __FILE__, __LINE__)));          \ 
    if(sub_ref(_s->dummy) <= 0) really_free_short_svalue(_s,_t);        \ 
  }                                                                     \ 
  DO_IF_DMALLOC(_s->refs=(void *)-1);                                   \ 
  PIKE_MEM_WO(_s->refs);                                                \ 
}while(0) 
 
/* Handles PIKE_T_FREE. */ 
#define add_ref_svalue(X) do {                                \ 
  struct svalue *_tmp=(X);                                      \ 
  DO_IF_DEBUG (                                                 \ 
    if (PIKE_TYPEOF(*_tmp) != PIKE_T_FREE) {                    \ 
      check_svalue_type(_tmp);                                  \ 
      check_refs(_tmp);                                         \ 
    }                                                           \ 
  );                                                            \ 
  if(REFCOUNTED_TYPE(PIKE_TYPEOF(*_tmp))) add_ref(_tmp->u.dummy);       \ 
}while(0) 
 
/* Handles PIKE_T_FREE. */ 
#define assign_svalue_no_free(X,Y) do {       \ 
  struct svalue *_to=(X);                               \ 
  const struct svalue *_from=(Y);                       \ 
  DO_IF_DEBUG (                                         \ 
    if (PIKE_TYPEOF(*_from) != PIKE_T_FREE) {           \ 
      check_svalue_type(_from);                         \ 
      check_refs(_from);                                \ 
    }                                                   \ 
    if (_to == _from)                                   \ 
      Pike_fatal(msg_assign_svalue_error, _to);         \ 
  );                                                    \ 
  *_to=*_from;                                          \ 
  if(REFCOUNTED_TYPE(PIKE_TYPEOF(*_to))) add_ref(_to->u.dummy); \ 
}while(0) 
 
/* Handles PIKE_T_FREE. */ 
#define assign_svalue(X,Y) do {       \ 
  struct svalue *_to2=(X);                      \ 
  const struct svalue *_from2=(Y);              \ 
  if (_to2 != _from2) {                         \ 
    free_svalue(_to2);                          \ 
     assign_svalue_no_free(_to2, _from2);       \ 
  }                                             \ 
}while(0) 
 
/* Handles PIKE_T_FREE. */ 
#define move_svalue(TO, FROM) do {                                    \ 
    struct svalue *_to = (TO);                                          \ 
    struct svalue *_from = (FROM);                                      \ 
    dmalloc_touch_svalue(_from);                                        \ 
    *_to = *_from;                                                      \ 
    assert_free_svalue (_from);                                         \ 
  } while (0) 
 
/* Handles PIKE_T_FREE. */ 
#define free_mixed_svalues(X,Y) do {          \ 
  struct svalue *s_=(X);                        \ 
  ptrdiff_t num_=(Y);                           \ 
  while(num_--)                                 \ 
  {                                             \ 
    dmalloc_touch_svalue(s_);                   \ 
    free_svalue(s_++);                          \ 
  }                                             \ 
}while(0) 
 
/* Handles PIKE_T_FREE. */ 
#ifdef DEBUG_MALLOC 
#define free_svalues(X,Y,Z) debug_free_svalues((X),(Y),(Z), DMALLOC_NAMED_LOCATION(" free_svalues")); 
#else 
#define free_svalues(X,Y,Z) debug_free_svalues((X),(Y),(Z)); 
#endif 
 
#define low_clear_svalues(X,Y,N) do {         \ 
  struct svalue *s_=(X);                        \ 
  ptrdiff_t num_=(Y);                           \ 
  for(;num_-- > 0;s_++)                         \ 
  {                                             \ 
    SET_SVAL(*s_, PIKE_T_INT, (N), integer, 0); \ 
  }                                             \ 
}while(0) 
 
#define clear_svalues(X,Y) low_clear_svalues((X),(Y),NUMBER_NUMBER) 
#define clear_svalues_undefined(X,Y) low_clear_svalues((X),(Y),NUMBER_UNDEFINED) 
 
#define really_free_short_svalue(U, TYPE) do {                                \ 
    union anything *any_ = (U);                                         \ 
    debug_malloc_touch (any_->ptr);                                     \ 
    really_free_short_svalue_ptr (&any_->ptr, (TYPE));                  \ 
  } while (0) 
 
/* Prototypes begin here */ 
PMOD_EXPORT void check_destructed(struct svalue *s); 
PMOD_EXPORT void really_free_short_svalue_ptr(void **s, TYPE_T type); 
PMOD_EXPORT void really_free_svalue(struct svalue *s); 
PMOD_EXPORT void do_free_svalue(struct svalue *s); 
PMOD_EXPORT void debug_free_svalues(struct svalue *s, size_t num, INT32 type_hint DMALLOC_LINE_ARGS); 
PMOD_EXPORT void debug_free_mixed_svalues(struct svalue *s, size_t num, INT32 type_hint DMALLOC_LINE_ARGS); 
PMOD_EXPORT TYPE_FIELD assign_svalues_no_free(struct svalue *to, 
                                              const struct svalue *from, 
                                              size_t num, 
                                              TYPE_FIELD type_hint); 
PMOD_EXPORT TYPE_FIELD assign_svalues(struct svalue *to, 
                                      const struct svalue *from, 
                                      size_t num, 
                                      TYPE_FIELD type_hint); 
PMOD_EXPORT void assign_no_ref_svalue(struct svalue *to, 
                                      const struct svalue *val, 
                                      const struct object *owner); 
PMOD_EXPORT void assign_to_short_svalue(union anything *u, 
                            TYPE_T type, 
                            const struct svalue *s); 
PMOD_EXPORT void assign_to_short_svalue_no_free(union anything *u, 
                                    TYPE_T type, 
                                    const struct svalue *s); 
PMOD_EXPORT void assign_from_short_svalue_no_free(struct svalue *s, 
                                      const union anything *u, 
                                      TYPE_T type); 
PMOD_EXPORT void assign_short_svalue_no_free(union anything *to, 
                                 const union anything *from, 
                                 TYPE_T type); 
PMOD_EXPORT void assign_short_svalue(union anything *to, 
                         const union anything *from, 
                         TYPE_T type); 
PMOD_EXPORT size_t hash_svalue(const struct svalue *s); 
PMOD_EXPORT int complex_svalue_is_true(const struct svalue *s); /* only handles object + function */ 
PMOD_EXPORT int svalue_is_true(const struct svalue *s); 
PMOD_EXPORT int safe_svalue_is_true(const struct svalue *s); 
PMOD_EXPORT int is_identical(const struct svalue *a, const struct svalue *b); 
PMOD_EXPORT int is_eq(const struct svalue *a, const struct svalue *b); 
PMOD_EXPORT int low_is_equal(const struct svalue *a, 
                 const struct svalue *b, 
                 struct processing *p); 
PMOD_EXPORT int low_short_is_equal(const union anything *a, 
                       const union anything *b, 
                       TYPE_T type, 
                       struct processing *p); 
PMOD_EXPORT int is_equal(const struct svalue *a, const struct svalue *b); 
PMOD_EXPORT int is_lt(const struct svalue *a, const struct svalue *b); 
PMOD_EXPORT int is_le(const struct svalue *a, const struct svalue *b); 
PMOD_EXPORT void describe_svalue(struct byte_buffer *buf, const struct svalue *s,int indent, 
                                 struct processing *p); 
PMOD_EXPORT void safe_describe_svalue(struct byte_buffer *buf, const struct svalue *s, 
                                      int indent,struct processing *p); 
PMOD_EXPORT void print_svalue (FILE *out, const struct svalue *s); 
PMOD_EXPORT void safe_print_svalue (FILE *out, const struct svalue *s); 
PMOD_EXPORT void print_short_svalue (FILE *out, const union anything *a, TYPE_T type); 
PMOD_EXPORT void safe_print_short_svalue (FILE *out, const union anything *a, TYPE_T type); 
PMOD_EXPORT void print_svalue_compact (FILE *out, const struct svalue *s); 
PMOD_EXPORT void safe_print_svalue_compact (FILE *out, const struct svalue *s); 
PMOD_EXPORT void print_short_svalue_compact (FILE *out, const union anything *a, TYPE_T type); 
PMOD_EXPORT void safe_print_short_svalue_compact (FILE *out, const union anything *a, TYPE_T type); 
#ifdef PIKE_DEBUG 
PMOD_EXPORT void safe_pike_vfprintf (FILE *out, const char *fmt, va_list args); 
PMOD_EXPORT void safe_pike_fprintf (FILE *out, const char *fmt, ...); 
#endif 
PMOD_EXPORT void copy_svalues_recursively_no_free(struct svalue *to, 
                                                  const struct svalue *from, 
                                                  size_t num, 
                                                  struct mapping *m); 
PMOD_EXPORT void real_gc_check_svalues(const struct svalue *s, size_t num); 
void gc_check_weak_svalues(const struct svalue *s, size_t num); 
PMOD_EXPORT void real_gc_check_short_svalue(const union anything *u, TYPE_T type); 
void gc_check_weak_short_svalue(const union anything *u, TYPE_T type); 
PMOD_EXPORT TYPE_FIELD real_gc_mark_svalues(struct svalue *s, size_t num); 
TYPE_FIELD gc_mark_weak_svalues(struct svalue *s, size_t num); 
int real_gc_mark_short_svalue(union anything *u, TYPE_T type); 
int gc_mark_weak_short_svalue(union anything *u, TYPE_T type); 
int gc_mark_without_recurse(struct svalue *s); 
int gc_mark_weak_without_recurse(struct svalue *s); 
PMOD_EXPORT TYPE_FIELD real_gc_cycle_check_svalues(struct svalue *s, size_t num); 
TYPE_FIELD gc_cycle_check_weak_svalues(struct svalue *s, size_t num); 
PMOD_EXPORT int real_gc_cycle_check_short_svalue(union anything *u, TYPE_T type); 
int gc_cycle_check_weak_short_svalue(union anything *u, TYPE_T type); 
void real_gc_free_svalue(struct svalue *s); 
void real_gc_free_short_svalue(union anything *u, TYPE_T type); 
PMOD_EXPORT INT_TYPE pike_sizeof(const struct svalue *s); 
int svalues_are_constant(const struct svalue *s, 
                         INT32 num, 
                         TYPE_FIELD hint, 
                         struct processing *p); 
 
static inline TYPE_FIELD PIKE_UNUSED_ATTRIBUTE BITOF(struct svalue sv) { 
    if (PIKE_TYPEOF(sv) >= sizeof(TYPE_FIELD) * 8) { 
        return BIT_MIXED | BIT_UNFINISHED; 
    } 
 
    return 1 << PIKE_TYPEOF(sv); 
} 
 
#define gc_cycle_check_without_recurse gc_mark_without_recurse 
#define gc_cycle_check_weak_without_recurse gc_mark_without_recurse 
 
#define gc_mark_external_svalues(S, NUM, PLACE) do {                  \ 
    size_t num__ = (NUM);                                               \ 
    real_gc_mark_external_svalues (                                     \ 
      dmalloc_check_svalues ((S), num__, DMALLOC_LOCATION()), num__, (PLACE)); \ 
  } while (0) 
#define gc_check_svalues(S, NUM) do {                                 \ 
    size_t num__ = (NUM);                                               \ 
    real_gc_check_svalues (                                             \ 
      dmalloc_check_svalues ((S), num__, DMALLOC_LOCATION()), num__);   \ 
  } while (0) 
 
#ifdef DEBUG_MALLOC 
static inline TYPE_FIELD PIKE_UNUSED_ATTRIBUTE dmalloc_gc_mark_svalues (struct svalue *s, size_t num, char *l) 
  {return real_gc_mark_svalues (dmalloc_check_svalues (s, num, l), num);} 
#define gc_mark_svalues(S, NUM) dmalloc_gc_mark_svalues ((S), (NUM), DMALLOC_LOCATION()) 
static inline TYPE_FIELD PIKE_UNUSED_ATTRIBUTE dmalloc_gc_cycle_check_svalues (struct svalue *s, size_t num, char *l) 
  {return real_gc_cycle_check_svalues (dmalloc_check_svalues (s, num, l), num);} 
#define gc_cycle_check_svalues(S, NUM) dmalloc_gc_cycle_check_svalues ((S), (NUM), DMALLOC_LOCATION()) 
#else 
#define gc_mark_svalues real_gc_mark_svalues 
#define gc_cycle_check_svalues real_gc_cycle_check_svalues 
#endif 
 
#define gc_check_short_svalue(U,T) real_gc_check_short_svalue(dmalloc_check_union((U),(T),DMALLOC_LOCATION()),T) 
#define gc_mark_short_svalue(U,T) real_gc_mark_short_svalue(dmalloc_check_union((U),(T),DMALLOC_LOCATION()),T) 
#define gc_cycle_check_short_svalue(U,T) real_gc_cycle_check_short_svalue(dmalloc_check_union((U),(T),DMALLOC_LOCATION()),(T)) 
#define gc_free_svalue(S) real_gc_free_svalue(dmalloc_check_svalue(S,DMALLOC_LOCATION())) 
#define gc_free_short_svalue(U,T) real_gc_free_short_svalue(dmalloc_check_union((U),(T),DMALLOC_LOCATION()),(T)) 
 
#ifndef NO_PIKE_SHORTHAND 
 
#define T_ARRAY    PIKE_T_ARRAY 
#define T_MAPPING  PIKE_T_MAPPING 
#define T_MULTISET PIKE_T_MULTISET 
#define T_OBJECT   PIKE_T_OBJECT 
#define T_FUNCTION PIKE_T_FUNCTION 
#define T_PROGRAM  PIKE_T_PROGRAM 
#define T_STRING   PIKE_T_STRING 
#define T_TYPE     PIKE_T_TYPE 
#define T_FLOAT    PIKE_T_FLOAT 
#define T_INT      PIKE_T_INT 
 
#define T_ZERO           PIKE_T_ZERO 
 
#define T_TUPLE          PIKE_T_TUPLE 
#define T_SCOPE          PIKE_T_SCOPE 
#define T_MIXED    PIKE_T_MIXED 
 
#endif /* !NO_PIKE_SHORTHAND */ 
 
#define PIKE_CONSTANT_MEMOBJ_INIT(refs, type) GC_HEADER_INIT(refs) 
 
#define INIT_PIKE_MEMOBJ(X, TYPE) do {                  \ 
  struct ref_dummy *v_=(struct ref_dummy *)(X);         \ 
  v_->refs=0;                                           \ 
  add_ref(v_); /* For DMALLOC... */                     \ 
}while(0) 
 
#define EXIT_PIKE_MEMOBJ(X) do {                        \ 
  struct ref_dummy *v_=(struct ref_dummy *)(X);         \ 
}while(0) 
 
struct ref_dummy 
{ 
  INT32 refs; 
}; 
 
/* The following macro is useful to initialize static svalues. . */ 
/* assumes sizeof void* >= all initialization arguments. */ 
#ifdef HAVE_C99_STRUCT_INIT 
#define SVALUE_INIT(TYPE, SUBTYPE, VAL) {.tu.type_subtype=TYPE_SUBTYPE(TYPE, SUBTYPE),.u.refs=(void*)VAL} 
 
/* Depends on T_INT and NUMBER_NUMBER being 0. */ 
#define SVALUE_INIT_INT(VAL)            {.tu.type_subtype=0,.u.integer=VAL} 
#else /* !HAVE_C99_STRUCT_INIT */ 
/* FIXME: Assumes that INT_TYPE and void * have the same size. */ 
#define SVALUE_INIT(TYPE, SUBTYPE, VAL) {{{TYPE, SUBTYPE}}, {(INT_TYPE)(void*)VAL}} 
#define SVALUE_INIT_INT(VAL)          {{{PIKE_T_INT, NUMBER_NUMBER}}, {VAL}} 
#endif /* !HAVE_C99_STRUCT_INIT */ 
 
#define SVALUE_INIT_FREE                SVALUE_INIT(PIKE_T_FREE,0,0) 
 
#endif /* !SVALUE_H */