pike.git/ src/ las.c

Branch: Tag:

2002-12-25

2002-12-25 18:18:01 by Henrik Grubbström (Grubba) <grubba@grubba.org>

Made depend_p() less paranoid again.

Rev: src/las.c:1.320

2:   || This file is part of Pike. For copyright information see COPYRIGHT.   || Pike is distributed under GPL, LGPL and MPL. See the file COPYING   || for more information. - || $Id: las.c,v 1.319 2002/12/20 15:25:20 grubba Exp $ + || $Id: las.c,v 1.320 2002/12/25 18:18:01 grubba Exp $   */      #include "global.h" - RCSID("$Id: las.c,v 1.319 2002/12/20 15:25:20 grubba Exp $"); + RCSID("$Id: las.c,v 1.320 2002/12/25 18:18:01 grubba Exp $");      #include "language.h"   #include "interpret.h"
36:      #define LASDEBUG    + /* Define this if you want the optimizer to be paranoid about aliasing +  * effects to to indexing. +  */ + /* #define PARANOID_INDEXING */ +    int lasdebug=0;      static node *eval(node *);
849:   {    node *res=alloc_node_s();    - #ifdef SHARED_NODES + #if defined(SHARED_NODES) || defined(__CHECKER__)    MEMSET(res, 0, sizeof(node)); -  + #ifdef SHARED_NODES    res->hash = 0;    res->refs = 1;   #endif /* SHARED_NODES */ -  + #endif /* SHARED_NODES || __CHECKER__ */       res->token=0;    res->line_number=lex.current_line;
2867:      /* FIXME: Ought to use parent pointer to avoid recursion. */   /* Find the variables that are used in the tree n. */ + /* noblock: Don't mark unused variables that are written to as blocked. +  * overwrite: n is an lvalue that is overwritten. +  */   static int find_used_variables(node *n,    struct used_vars *p,    int noblock,
2951:       case F_ARROW:    case F_INDEX: + #ifdef PARANOID_INDEXING +  /* Be paranoid, and assume aliasing. */    p->ext_flags = VAR_USED; -  + #endif /* PARANOID_INDEXING */    if(car_is_node(n)) find_used_variables(CAR(n),p,noblock,0);    if(cdr_is_node(n)) find_used_variables(CDR(n),p,noblock,0);    break;
3071:       case F_INDEX:    case F_ARROW: + #ifdef PARANOID_INDEXING +  /* Be paranoid and assume aliasing. */    if (lvalue)    p->ext_flags = VAR_USED;    find_written_vars(CAR(n), p, 0); -  + #else /* !PARAONID_INDEXING */ +  /* Propagate the change to the indexed value. +  * Note: This is sensitive to aliasing effects. +  */ +  find_written_vars(CAR(n), p, lvalue); + #endif /* PARANOID_INDEXING */    find_written_vars(CDR(n), p, 0);    break;    -  +  case F_SOFT_CAST: +  find_written_vars(CAR(n), p, lvalue); +  break; +     case F_INC:    case F_DEC:    case F_POST_INC: