Logo Search packages:      
Sourcecode: pcc version File versions  Download package

local.c

/*    $Id: local.c,v 1.141 2011/04/19 20:05:10 ragge Exp $  */
/*
 * Copyright (c) 2003 Anders Magnusson (ragge@ludd.luth.se).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include "pass1.h"

/*    this file contains code which is dependent on the target machine */

#ifdef notyet
/*
 * Check if a constant is too large for a type.
 */
static int
toolarge(TWORD t, CONSZ con)
{
      U_CONSZ ucon = con;

      switch (t) {
      case ULONGLONG:
      case LONGLONG:
            break; /* cannot be too large */
#define     SCHK(i)     case i: if (con > MAX_##i || con < MIN_##i) return 1; break
#define     UCHK(i)     case i: if (ucon > MAX_##i) return 1; break
      SCHK(INT);
      SCHK(SHORT);
      case BOOL:
      SCHK(CHAR);
      UCHK(UNSIGNED);
      UCHK(USHORT);
      UCHK(UCHAR);
      default:
            cerror("toolarge");
      }
      return 0;
}
#endif

#if defined(MACHOABI)

/*
 *  Keep track of PIC stubs.
 */

void
addstub(struct stub *list, char *name)
{
        struct stub *s;

        DLIST_FOREACH(s, list, link) {
                if (strcmp(s->name, name) == 0)
                        return;
        }

        s = permalloc(sizeof(struct stub));
        s->name = permalloc(strlen(name) + 1);
        strcpy(s->name, name);
        DLIST_INSERT_BEFORE(list, s, link);
}

#endif

#define     IALLOC(sz)  (isinlining ? permalloc(sz) : tmpalloc(sz))

/*
 * Make a symtab entry for PIC use.
 */
static struct symtab *
picsymtab(char *p, char *s, char *s2)
{
      struct symtab *sp = IALLOC(sizeof(struct symtab));
      size_t len = strlen(p) + strlen(s) + strlen(s2) + 1;
      
      sp->sname = sp->soname = IALLOC(len);
      strlcpy(sp->soname, p, len);
      strlcat(sp->soname, s, len);
      strlcat(sp->soname, s2, len);
      sp->sap = NULL;
      sp->sclass = EXTERN;
      sp->sflags = sp->slevel = 0;
      return sp;
}

#ifdef os_win32
static NODE *
import(NODE *p)
{
      NODE *q;
      char *name;
      struct symtab *sp;

      if ((name = p->n_sp->soname) == NULL)
            name = exname(p->n_sp->sname);

      sp = picsymtab("__imp_", name, "");
      q = xbcon(0, sp, PTR+VOID);
      q = block(UMUL, q, 0, PTR|VOID, 0, 0);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp; /* for init */
      nfree(p);

      return q;
}
#endif

int gotnr; /* tempnum for GOT register */
int argstacksize;

/*
 * Create a reference for an extern variable.
 */
static NODE *
picext(NODE *p)
{

#if defined(ELFABI)

      NODE *q, *r;
      struct symtab *sp;
      char *name;

      q = tempnode(gotnr, PTR|VOID, 0, 0);
      if ((name = p->n_sp->soname) == NULL)
            name = p->n_sp->sname;
      sp = picsymtab("", name, "@GOT");
#ifdef GCC_COMPAT
      if (attr_find(p->n_sp->sap, GCC_ATYP_STDCALL) != NULL)
            p->n_sp->sflags |= SSTDCALL;
#endif
      sp->sflags = p->n_sp->sflags & SSTDCALL;
      r = xbcon(0, sp, INT);
      q = buildtree(PLUS, q, r);
      q = block(UMUL, q, 0, PTR|VOID, 0, 0);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp; /* for init */
      nfree(p);
      return q;

#elif defined(MACHOABI)

      NODE *q, *r;
      struct symtab *sp;
      char buf2[256], *name, *pspn;

      if ((name = cftnsp->soname) == NULL)
            name = cftnsp->sname;
      if ((pspn = p->n_sp->soname) == NULL)
            pspn = exname(p->n_sp->sname);
      if (p->n_sp->sclass == EXTDEF) {
            snprintf(buf2, 256, "-L%s$pb", name);
            sp = picsymtab("", pspn, buf2);
      } else {
            snprintf(buf2, 256, "$non_lazy_ptr-L%s$pb", name);
            sp = picsymtab("L", pspn, buf2);
            addstub(&nlplist, pspn);
      }
      q = tempnode(gotnr, PTR+VOID, 0, 0);
      r = xbcon(0, sp, INT);
      q = buildtree(PLUS, q, r);

      if (p->n_sp->sclass != EXTDEF)
            q = block(UMUL, q, 0, PTR+VOID, 0, 0);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp; /* for init */
      nfree(p);
      return q;

#else /* defined(PECOFFABI) || defined(AOUTABI) */

      return p;

#endif

}

/*
 * Create a reference for a static variable.
 */
static NODE *
picstatic(NODE *p)
{

#if defined(ELFABI)

      NODE *q, *r;
      struct symtab *sp;

      q = tempnode(gotnr, PTR|VOID, 0, 0);
      if (p->n_sp->slevel > 0) {
            char buf[32];
            snprintf(buf, 32, LABFMT, (int)p->n_sp->soffset);
            sp = picsymtab("", buf, "@GOTOFF");
      } else {
            char *name;
            if ((name = p->n_sp->soname) == NULL)
                  name = p->n_sp->sname;
            sp = picsymtab("", name, "@GOTOFF");
      }
      
      sp->sclass = STATIC;
      sp->stype = p->n_sp->stype;
      r = xbcon(0, sp, INT);
      q = buildtree(PLUS, q, r);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp; /* for init */
      nfree(p);
      return q;

#elif defined(MACHOABI)

      NODE *q, *r;
      struct symtab *sp;
      char buf2[256];

      snprintf(buf2, 256, "-L%s$pb",
          cftnsp->soname ? cftnsp->soname : cftnsp->sname);

      if (p->n_sp->slevel > 0) {
            char buf1[32];
            snprintf(buf1, 32, LABFMT, (int)p->n_sp->soffset);
            sp = picsymtab("", buf1, buf2);
      } else  {
            char *name;
            if ((name = p->n_sp->soname) == NULL)
                  name = p->n_sp->sname;
            sp = picsymtab("", exname(name), buf2);
      }
      sp->sclass = STATIC;
      sp->stype = p->n_sp->stype;
      q = tempnode(gotnr, PTR+VOID, 0, 0);
      r = xbcon(0, sp, INT);
      q = buildtree(PLUS, q, r);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp;
      nfree(p);
      return q;

#else /* defined(PECOFFABI) || defined(AOUTABI) */

      return p;

#endif

}

#ifdef TLS
/*
 * Create a reference for a TLS variable.
 */
static NODE *
tlspic(NODE *p)
{
      NODE *q, *r;
      struct symtab *sp, *sp2;
      char *name;

      /*
       * creates:
       *   leal var@TLSGD(%ebx),%eax
       *   call ___tls_get_addr@PLT
       */

      /* calc address of var@TLSGD */
      q = tempnode(gotnr, PTR|VOID, 0, 0);
      if ((name = p->n_sp->soname) == NULL)
            name = p->n_sp->sname;
      sp = picsymtab("", name, "@TLSGD");
      r = xbcon(0, sp, INT);
      q = buildtree(PLUS, q, r);

      /* assign to %eax */
      r = block(REG, NIL, NIL, PTR|VOID, 0, 0);
      r->n_rval = EAX;
      q = buildtree(ASSIGN, r, q);

      /* call ___tls_get_addr */
      sp2 = lookup("___tls_get_addr@PLT", 0);
      sp2->stype = EXTERN|INT|FTN;
      r = nametree(sp2);
      r = buildtree(ADDROF, r, NIL);
      r = block(UCALL, r, NIL, INT, 0, 0);

      /* fusion both parts together */
      q = buildtree(COMOP, q, r);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp; /* for init */

      nfree(p);
      return q;
}

static NODE *
tlsnonpic(NODE *p)
{
      NODE *q, *r;
      struct symtab *sp, *sp2;
      int ext = p->n_sp->sclass;
      char *name;

      if ((name = p->n_sp->soname) == NULL)
            name = p->n_sp->sname;
      sp = picsymtab("", name,
          ext == EXTERN ? "@INDNTPOFF" : "@NTPOFF");
      q = xbcon(0, sp, INT);
      if (ext == EXTERN)
            q = block(UMUL, q, NIL, PTR|VOID, 0, 0);

      sp2 = lookup("%gs:0", 0);
      sp2->stype = EXTERN|INT;
      r = nametree(sp2);

      q = buildtree(PLUS, q, r);
      q = block(UMUL, q, 0, p->n_type, p->n_df, p->n_ap);
      q->n_sp = p->n_sp; /* for init */

      nfree(p);
      return q;
}

static NODE *
tlsref(NODE *p)
{
      if (kflag)
            return (tlspic(p));
      else
            return (tlsnonpic(p));
}
#endif

/* clocal() is called to do local transformations on
 * an expression tree preparitory to its being
 * written out in intermediate code.
 *
 * the major essential job is rewriting the
 * automatic variables and arguments in terms of
 * REG and OREG nodes
 * conversion ops which are not necessary are also clobbered here
 * in addition, any special features (such as rewriting
 * exclusive or) are easily handled here as well
 */
NODE *
clocal(NODE *p)
{

      register struct symtab *q;
      register NODE *r, *l;
#if defined(os_openbsd)
      register NODE *s, *n;
#endif
      register int o;
      register int m;

#ifdef PCC_DEBUG
      if (xdebug) {
            printf("clocal: %p\n", p);
            fwalk(p, eprint, 0);
      }
#endif
      switch( o = p->n_op ){

      case NAME:
            if ((q = p->n_sp) == NULL)
                  return p; /* Nothing to care about */

            switch (q->sclass) {

            case PARAM:
            case AUTO:
                  /* fake up a structure reference */
                  r = block(REG, NIL, NIL, PTR+STRTY, 0, 0);
                  r->n_lval = 0;
                  r->n_rval = FPREG;
                  p = stref(block(STREF, r, p, 0, 0, 0));
                  break;

            case USTATIC:
                  if (kflag == 0)
                        break;
                  /* FALLTHROUGH */
            case STATIC:
#ifdef TLS
                  if (q->sflags & STLS) {
                        p = tlsref(p);
                        break;
                  }
#endif
                  if (kflag == 0) {
                        if (q->slevel == 0)
                              break;
                        p->n_lval = 0;
                  } else if (blevel > 0)
                        p = picstatic(p);
                  break;

            case REGISTER:
                  p->n_op = REG;
                  p->n_lval = 0;
                  p->n_rval = q->soffset;
                  break;

            case EXTERN:
            case EXTDEF:
#ifdef TLS
                  if (q->sflags & STLS) {
                        p = tlsref(p);
                        break;
                  }
#endif

#ifdef os_win32
                  if (q->sflags & SDLLINDIRECT)
                        p = import(p);
#endif
                  if (kflag == 0)
                        break;
                  if (blevel > 0)
                        p = picext(p);
                  break;
            }
            break;

      case ADDROF:
            if (kflag == 0 || blevel == 0)
                  break;
            /* char arrays may end up here */
            l = p->n_left;
            if (l->n_op != NAME ||
                (l->n_type != ARY+CHAR && l->n_type != ARY+WCHAR_TYPE))
                  break;
            l = p;
            p = picstatic(p->n_left);
            nfree(l);
            if (p->n_op != UMUL)
                  cerror("ADDROF error");
            l = p;
            p = p->n_left;
            nfree(l);
            break;

      case UCALL:
      case USTCALL:
            if (kflag == 0)
                  break;
#if defined(ELFABI)
            /* Change to CALL node with ebx as argument */
            l = block(REG, NIL, NIL, INT, 0, 0);
            l->n_rval = EBX;
            p->n_right = buildtree(ASSIGN, l,
                tempnode(gotnr, INT, 0, 0));
            p->n_op -= (UCALL-CALL);
#endif
      
      /* FALLTHROUGH */
#if defined(MACHOABI)
      case CALL:
      case STCALL:
            if (p->n_type == VOID)
                  break;

            r = tempnode(0, p->n_type, p->n_df, p->n_ap);
            l = tcopy(r);
            p = buildtree(COMOP, buildtree(ASSIGN, r, p), l);
#endif
                  
            break;

#ifdef notyet
      /* XXX breaks sometimes */
      case CBRANCH:
            l = p->n_left;

            /*
             * Remove unnecessary conversion ops.
             */
            if (!clogop(l->n_op) || l->n_left->n_op != SCONV)
                  break;
            if (coptype(l->n_op) != BITYPE)
                  break;
            if (l->n_right->n_op != ICON)
                  break;
            r = l->n_left->n_left;
            if (r->n_type >= FLOAT)
                  break;
            if (toolarge(r->n_type, l->n_right->n_lval))
                  break;
            l->n_right->n_type = r->n_type;
            if (l->n_op >= ULE && l->n_op <= UGT)
                  l->n_op -= (UGT-ULE);
            p->n_left = buildtree(l->n_op, r, l->n_right);
            nfree(l->n_left);
            nfree(l);
            break;
#endif

      case PCONV:
            /* Remove redundant PCONV's. Be careful */
            l = p->n_left;
            if (l->n_op == ICON) {
                  l->n_lval = (unsigned)l->n_lval;
                  goto delp;
            }
            if (l->n_type < INT || l->n_type == LONGLONG || 
                l->n_type == ULONGLONG || l->n_type == BOOL) {
                  /* float etc? */
                  p->n_left = block(SCONV, l, NIL,
                      UNSIGNED, 0, 0);
                  break;
            }
            /* if left is SCONV, cannot remove */
            if (l->n_op == SCONV)
                  break;

            /* avoid ADDROF TEMP */
            if (l->n_op == ADDROF && l->n_left->n_op == TEMP)
                  break;

            /* if conversion to another pointer type, just remove */
            if (p->n_type > BTMASK && l->n_type > BTMASK)
                  goto delp;
            break;

      delp: l->n_type = p->n_type;
            l->n_qual = p->n_qual;
            l->n_df = p->n_df;
            l->n_ap = p->n_ap;
            nfree(p);
            p = l;
            break;
            
      case SCONV:
            if (p->n_left->n_op == COMOP)
                  break;  /* may propagate wrong type later */
            l = p->n_left;

            if (p->n_type == l->n_type) {
                  nfree(p);
                  return l;
            }

            if ((p->n_type & TMASK) == 0 && (l->n_type & TMASK) == 0 &&
                tsize(p->n_type, p->n_df, p->n_ap) ==
                tsize(l->n_type, l->n_df, l->n_ap)) {
                  if (p->n_type != FLOAT && p->n_type != DOUBLE &&
                      l->n_type != FLOAT && l->n_type != DOUBLE &&
                      l->n_type != LDOUBLE && p->n_type != LDOUBLE) {
                        if (l->n_op == NAME || l->n_op == UMUL ||
                            l->n_op == TEMP) {
                              l->n_type = p->n_type;
                              nfree(p);
                              return l;
                        }
                  }
            }

            if (DEUNSIGN(p->n_type) == INT && DEUNSIGN(l->n_type) == INT &&
                coptype(l->n_op) == BITYPE && l->n_op != COMOP &&
                l->n_op != QUEST) {
                  l->n_type = p->n_type;
                  nfree(p);
                  return l;
            }

            o = l->n_op;
            m = p->n_type;

            if (o == ICON) {
                  CONSZ val = l->n_lval;

                  if (!ISPTR(m)) /* Pointers don't need to be conv'd */
                      switch (m) {
                  case BOOL:
                        l->n_lval = nncon(l) ? (l->n_lval != 0) : 1;
                        l->n_sp = NULL;
                        break;
                  case CHAR:
                        l->n_lval = (char)val;
                        break;
                  case UCHAR:
                        l->n_lval = val & 0377;
                        break;
                  case SHORT:
                        l->n_lval = (short)val;
                        break;
                  case USHORT:
                        l->n_lval = val & 0177777;
                        break;
                  case ULONG:
                  case UNSIGNED:
                        l->n_lval = val & 0xffffffff;
                        break;
                  case LONG:
                  case INT:
                        l->n_lval = (int)val;
                        break;
                  case LONGLONG:
                        l->n_lval = (long long)val;
                        break;
                  case ULONGLONG:
                        l->n_lval = val;
                        break;
                  case VOID:
                        break;
                  case LDOUBLE:
                  case DOUBLE:
                  case FLOAT:
                        l->n_op = FCON;
                        l->n_dcon = val;
                        break;
                  default:
                        cerror("unknown type %d", m);
                  }
                  l->n_type = m;
                  l->n_ap = 0;
                  nfree(p);
                  return l;
            } else if (l->n_op == FCON) {
                  l->n_lval = (CONSZ)l->n_dcon;
                  l->n_sp = NULL;
                  l->n_op = ICON;
                  l->n_type = m;
                  l->n_ap = 0;
                  nfree(p);
                  return clocal(l);
            }
            if ((p->n_type == CHAR || p->n_type == UCHAR ||
                p->n_type == SHORT || p->n_type == USHORT) &&
                (l->n_type == FLOAT || l->n_type == DOUBLE ||
                l->n_type == LDOUBLE)) {
                  p = block(SCONV, p, NIL, p->n_type, p->n_df, p->n_ap);
                  p->n_left->n_type = INT;
                  return p;
            }
            break;

      case MOD:
      case DIV:
            if (o == DIV && p->n_type != CHAR && p->n_type != SHORT)
                  break;
            if (o == MOD && p->n_type != CHAR && p->n_type != SHORT)
                  break;
            /* make it an int division by inserting conversions */
            p->n_left = block(SCONV, p->n_left, NIL, INT, 0, 0);
            p->n_right = block(SCONV, p->n_right, NIL, INT, 0, 0);
            p = block(SCONV, p, NIL, p->n_type, 0, 0);
            p->n_left->n_type = INT;
            break;

      case PMCONV:
      case PVCONV:
            r = p;
            p = buildtree(o == PMCONV ? MUL : DIV, p->n_left, p->n_right);
            nfree(r);
            break;

      case FORCE:
            /* put return value in return reg */
            p->n_op = ASSIGN;
            p->n_right = p->n_left;
            p->n_left = block(REG, NIL, NIL, p->n_type, 0, 0);
            p->n_left->n_rval = p->n_left->n_type == BOOL ? 
                RETREG(CHAR) : RETREG(p->n_type);
            break;

      case LS:
      case RS:
            /* shift count must be in a char */
            if (p->n_right->n_type == CHAR || p->n_right->n_type == UCHAR)
                  break;
            p->n_right = block(SCONV, p->n_right, NIL, CHAR, 0, 0);
            break;
#if defined(os_openbsd)
            /* If not using pcc struct return */
      case STASG:
            r = p->n_right;
            if (r->n_op != STCALL && r->n_op != USTCALL)
                  break;
            m = tsize(BTYPE(r->n_type), r->n_df, r->n_ap);
            if (m == SZCHAR)
                  m = CHAR;
            else if (m == SZSHORT)
                  m = SHORT;
            else if (m == SZINT)
                  m = INT;
            else if (m == SZLONGLONG)
                  m = LONGLONG;
            else
                  break;

            l = buildtree(ADDROF, p->n_left, NIL);
            nfree(p);

            r->n_op -= (STCALL-CALL);
            r->n_type = m;

            /* r = long, l = &struct */

            n = tempnode(0, m, r->n_df, r->n_ap);
            r = buildtree(ASSIGN, ccopy(n), r);

            s = tempnode(0, l->n_type, l->n_df, l->n_ap);
            l = buildtree(ASSIGN, ccopy(s), l);

            p = buildtree(COMOP, r, l);

            l = buildtree(CAST,
                block(NAME, NIL, NIL, m|PTR, 0, 0), ccopy(s));
            r = l->n_right;
            nfree(l->n_left);
            nfree(l);

            r = buildtree(ASSIGN, buildtree(UMUL, r, NIL), n);
            p = buildtree(COMOP, p, r);
            p = buildtree(COMOP, p, s);
            break;
#endif
      }
#ifdef PCC_DEBUG
      if (xdebug) {
            printf("clocal end: %p\n", p);
            fwalk(p, eprint, 0);
      }
#endif
      return(p);
}

/*
 * Change CALL references to either direct (static) or PLT.
 */
static void
fixnames(NODE *p, void *arg)
{
#if defined(ELFABI) || defined(MACHOABI)

      struct symtab *sp;
      struct attr *ap;
      NODE *q;
      char *c;
      int isu;

      if ((cdope(p->n_op) & CALLFLG) == 0)
            return;
      isu = 0;
      q = p->n_left;
      ap = q->n_ap;
      if (q->n_op == UMUL)
            q = q->n_left, isu = 1;

      if (q->n_op == PLUS && q->n_left->n_op == TEMP &&
          q->n_right->n_op == ICON) {
            sp = q->n_right->n_sp;

            if (sp == NULL)
                  return;     /* nothing to do */
            if (sp->sclass == STATIC && !ISFTN(sp->stype))
                  return; /* function pointer */

            if (sp->sclass != STATIC && sp->sclass != EXTERN &&
                sp->sclass != EXTDEF)
                  cerror("fixnames");
            c = NULL;
#if defined(ELFABI)

            if (sp->soname == NULL ||
                (c = strstr(sp->soname, "@GOT")) == NULL)
                  cerror("fixnames2");
            if (isu) {
                  memcpy(c, "@PLT", sizeof("@PLT"));
            } else
                  *c = 0;

#elif defined(MACHOABI)

            if (sp->soname == NULL ||
                ((c = strstr(sp->soname, "$non_lazy_ptr")) == NULL &&
                (c = strstr(sp->soname, "-L")) == NULL))
                        cerror("fixnames2");
            if (isu) {
                  *c = 0;
                  addstub(&stublist, sp->soname+1);
                  strcpy(c, "$stub");
            } else 
                  *c = 0;

#endif

            nfree(q->n_left);
            q = q->n_right;
            if (isu)
                  nfree(p->n_left->n_left);
            nfree(p->n_left);
            p->n_left = q;
            q->n_ap = ap;
      }
#endif
}

static void mangle(NODE *p);

void
myp2tree(NODE *p)
{
      struct symtab *sp;

      if (kflag)
            fixnames(p, 0);

      mangle(p);

      if (p->n_op != FCON)
            return;

      sp = IALLOC(sizeof(struct symtab));
      sp->sclass = STATIC;
      sp->sap = 0;
      sp->slevel = 1; /* fake numeric label */
      sp->soffset = getlab();
      sp->sflags = 0;
      sp->stype = p->n_type;
      sp->squal = (CON >> TSHIFT);

      defloc(sp);
      ninval(0, tsize(sp->stype, sp->sdf, sp->sap), p);

      if (kflag) {
            sp->sname = sp->soname = inlalloc(32);
            snprintf(sp->sname, 32, LABFMT "@GOTOFF", (int)sp->soffset);
            sp->sclass = EXTERN;
            sp->sflags = sp->slevel = 0;
      }
      p->n_op = NAME;
      p->n_lval = 0;
      p->n_sp = sp;
}

/*ARGSUSED*/
int
andable(NODE *p)
{
      return(1);  /* all names can have & taken on them */
}

/*
 * at the end of the arguments of a ftn, set the automatic offset
 */
void
cendarg()
{
      autooff = AUTOINIT;
}

/*
 * Return 1 if a variable of type type is OK to put in register.
 */
int
cisreg(TWORD t)
{
      if (t == FLOAT || t == DOUBLE || t == LDOUBLE)
            return 0; /* not yet */
      return 1;
}

/*
 * return a node, for structure references, which is suitable for
 * being added to a pointer of type t, in order to be off bits offset
 * into a structure
 * t, d, and s are the type, dimension offset, and sizeoffset
 * For pdp10, return the type-specific index number which calculation
 * is based on its size. For example, short a[3] would return 3.
 * Be careful about only handling first-level pointers, the following
 * indirections must be fullword.
 */
NODE *
offcon(OFFSZ off, TWORD t, union dimfun *d, struct attr *ap)
{
      register NODE *p;

      if (xdebug)
            printf("offcon: OFFSZ %lld type %x dim %p siz %d\n",
                off, t, d, 0);

      p = bcon(0);
      p->n_lval = off/SZCHAR; /* Default */
      return(p);
}

/*
 * Allocate off bits on the stack.  p is a tree that when evaluated
 * is the multiply count for off, t is a storeable node where to write
 * the allocated address.
 */
void
spalloc(NODE *t, NODE *p, OFFSZ off)
{
      NODE *sp;

      p = buildtree(MUL, p, bcon(off/SZCHAR)); /* XXX word alignment? */

      /* sub the size from sp */
      sp = block(REG, NIL, NIL, p->n_type, 0, 0);
      sp->n_lval = 0;
      sp->n_rval = STKREG;
      ecomp(buildtree(MINUSEQ, sp, p));

#ifdef MACHOABI   
      /* align to 16 bytes */
      sp = block(REG, NIL, NIL, p->n_type, 0, 0);
      sp->n_lval = 0;
      sp->n_rval = STKREG;
      ecomp(buildtree(PLUSEQ, sp, bcon(15)));
      
      sp = block(REG, NIL, NIL, p->n_type, 0, 0);
      sp->n_lval = 0;
      sp->n_rval = STKREG;
      ecomp(buildtree(RSEQ, sp, bcon(4)));
      
      sp = block(REG, NIL, NIL, p->n_type, 0, 0);
      sp->n_lval = 0;
      sp->n_rval = STKREG;
      ecomp(buildtree(LSEQ, sp, bcon(4)));
#endif
      

      /* save the address of sp */
      sp = block(REG, NIL, NIL, PTR+INT, t->n_df, t->n_ap);
      sp->n_lval = 0;
      sp->n_rval = STKREG;
      t->n_type = sp->n_type;
      ecomp(buildtree(ASSIGN, t, sp)); /* Emit! */

}

/*
 * Print out a string of characters.
 * Assume that the assembler understands C-style escape
 * sequences.
 */
void
instring(struct symtab *sp)
{
      char *s, *str = sp->sname;

#if !defined(MACHOABI)

      defloc(sp);

#else

      extern int lastloc;
      if (lastloc != STRNG)
            printf("    .cstring\n");
      lastloc = STRNG;
      printf("\t.p2align 2\n");
      printf(LABFMT ":\n", sp->soffset);

#endif

      /* be kind to assemblers and avoid long strings */
      printf("\t.ascii \"");
      for (s = str; *s != 0; ) {
            if (*s++ == '\\') {
                  (void)esccon(&s);
            }
            if (s - str > 60) {
                  fwrite(str, 1, s - str, stdout);
                  printf("\"\n\t.ascii \"");
                  str = s;
            }
      }
      fwrite(str, 1, s - str, stdout);
      printf("\\0\"\n");
}

static int inbits, inval;

/*
 * set fsz bits in sequence to zero.
 */
void
zbits(OFFSZ off, int fsz)
{
      int m;

      if (idebug)
            printf("zbits off %lld, fsz %d inbits %d\n", off, fsz, inbits);
      if ((m = (inbits % SZCHAR))) {
            m = SZCHAR - m;
            if (fsz < m) {
                  inbits += fsz;
                  return;
            } else {
                  fsz -= m;
                  printf("\t.byte %d\n", inval);
                  inval = inbits = 0;
            }
      }
      if (fsz >= SZCHAR) {
#ifdef os_darwin
            printf("\t.space %d\n", fsz/SZCHAR);
#else
            printf("\t.zero %d\n", fsz/SZCHAR);
#endif
            fsz -= (fsz/SZCHAR) * SZCHAR;
      }
      if (fsz) {
            inval = 0;
            inbits = fsz;
      }
}

/*
 * Initialize a bitfield.
 */
void
infld(CONSZ off, int fsz, CONSZ val)
{
      if (idebug)
            printf("infld off %lld, fsz %d, val %lld inbits %d\n",
                off, fsz, val, inbits);
      val &= ((CONSZ)1 << fsz)-1;
      while (fsz + inbits >= SZCHAR) {
            inval |= (int)(val << inbits);
            printf("\t.byte %d\n", inval & 255);
            fsz -= (SZCHAR - inbits);
            val >>= (SZCHAR - inbits);
            inval = inbits = 0;
      }
      if (fsz) {
            inval |= (int)(val << inbits);
            inbits += fsz;
      }
}

/*
 * print out a constant node, may be associated with a label.
 * Do not free the node after use.
 * off is bit offset from the beginning of the aggregate
 * fsz is the number of bits this is referring to
 */
void
ninval(CONSZ off, int fsz, NODE *p)
{
      union { float f; double d; long double l; int i[3]; } u;
      struct symtab *q;
#if defined(ELFABI) || defined(MACHOABI)
      char *c;
#endif
      TWORD t;
      int i;

      t = p->n_type;
      if (t > BTMASK)
            t = INT; /* pointer */

      while (p->n_op == SCONV || p->n_op == PCONV) {
            NODE *l = p->n_left;
            l->n_type = p->n_type;
            p = l;
      }

      if (kflag && (p->n_op == PLUS || p->n_op == UMUL)) {
            if (p->n_op == UMUL)
                  p = p->n_left;
            p = p->n_right;
            q = p->n_sp;

            if (q->soname != NULL) {
#if defined(ELFABI)

                  if ((c = strstr(q->soname, "@GOT")) != NULL)
                        *c = 0; /* ignore GOT ref here */
#elif defined(MACHOABI)

                  if  ((c = strstr(q->soname, "$non_lazy_ptr")) != NULL) {
                        q->soname++;      /* skip "L" */
                        *c = 0; /* ignore GOT ref here */
                  } else if ((c = strstr(q->soname, "-L")) != NULL)
                        *c = 0; /* ignore GOT ref here */
#endif
            }
      }
      if (p->n_op != ICON && p->n_op != FCON)
            cerror("ninval: init node not constant");

      if (p->n_op == ICON && p->n_sp != NULL && DEUNSIGN(t) != INT)
            uerror("element not constant");

      switch (t) {
      case LONGLONG:
      case ULONGLONG:
            i = (int)(p->n_lval >> 32);
            p->n_lval &= 0xffffffff;
            p->n_type = INT;
            ninval(off, 32, p);
            p->n_lval = i;
            ninval(off+32, 32, p);
            break;
      case INT:
      case UNSIGNED:
            printf("\t.long %d", (int)p->n_lval);
            if ((q = p->n_sp) != NULL) {
                  if ((q->sclass == STATIC && q->slevel > 0)) {
                        printf("+" LABFMT, q->soffset);
                  } else {
                        char *name;
                        if ((name = q->soname) == NULL)
                              name = exname(q->sname);
                        printf("+%s", name);
                  }
            }
            printf("\n");
            break;
      case SHORT:
      case USHORT:
#ifdef os_sunos
            printf("\t.2byte 0x%x\n", (int)p->n_lval & 0xffff);
#else
            printf("\t.short 0x%x\n", (int)p->n_lval & 0xffff);
#endif
            break;
      case BOOL:
            if (p->n_lval > 1)
                  p->n_lval = p->n_lval != 0;
            /* FALLTHROUGH */
      case CHAR:
      case UCHAR:
            printf("\t.byte %d\n", (int)p->n_lval & 0xff);
            break;
      case LDOUBLE:
            u.i[2] = 0;
            u.l = (long double)p->n_dcon;
#if defined(HOST_BIG_ENDIAN)
            /* XXX probably broken on most hosts */
            printf("\t.long\t0x%x,0x%x,0x%x\n", u.i[2], u.i[1], u.i[0]);
#else
            printf("\t.long\t%d,%d,%d\n", u.i[0], u.i[1], u.i[2] & 0177777);
#endif
            break;
      case DOUBLE:
            u.d = (double)p->n_dcon;
#if defined(HOST_BIG_ENDIAN)
            printf("\t.long\t0x%x,0x%x\n", u.i[1], u.i[0]);
#else
            printf("\t.long\t%d,%d\n", u.i[0], u.i[1]);
#endif
            break;
      case FLOAT:
            u.f = (float)p->n_dcon;
            printf("\t.long\t%d\n", u.i[0]);
            break;
      default:
            cerror("ninval");
      }
}

/* make a name look like an external name in the local machine */
char *
exname(char *p)
{
#if !defined(ELFABI)

#define NCHNAM  256
      static char text[NCHNAM+1];
      int i;

      if (p == NULL)
            return "";

      text[0] = '_';
      for (i=1; *p && i<NCHNAM; ++i)
            text[i] = *p++;

      text[i] = '\0';
      text[NCHNAM] = '\0';  /* truncate */

      return (text);

#else

      return (p == NULL ? "" : p);

#endif
}

/*
 * map types which are not defined on the local machine
 */
TWORD
ctype(TWORD type)
{
      switch (BTYPE(type)) {
      case LONG:
            MODTYPE(type,INT);
            break;

      case ULONG:
            MODTYPE(type,UNSIGNED);

      }
      return (type);
}

void
calldec(NODE *p, NODE *q) 
{
}

void
extdec(struct symtab *q)
{
}

/* make a common declaration for id, if reasonable */
void
defzero(struct symtab *sp)
{
      int off;
      int al;
      char *name;

#ifdef TLS
      if (sp->sflags & STLS) {
            if (sp->sclass == EXTERN)
                  sp->sclass = EXTDEF;
            simpleinit(sp, bcon(0));
            return;
      }
#endif

      if ((name = sp->soname) == NULL)
            name = exname(sp->sname);
      al = talign(sp->stype, sp->sap)/SZCHAR;
      off = (int)tsize(sp->stype, sp->sdf, sp->sap);
      off = (off+(SZCHAR-1))/SZCHAR;
      if (attr_find(sp->sap, GCC_ATYP_SECTION)) {
            /* let the "other" code handle sections */
            if (sp->sclass != STATIC)
                  printf("    .globl %s\n", name);
            defloc(sp);
#ifdef os_darwin
            printf("\t.space %d\n", off);
#else
            printf("\t.zero %d\n", off);
#endif
            return;
      }

#ifdef GCC_COMPAT
      {
            struct attr *ap;
            if ((ap = attr_find(sp->sap, GCC_ATYP_VISIBILITY)) &&
                strcmp(ap->sarg(0), "default"))
                  printf("\t.%s %s\n", ap->sarg(0), name);
      }
#endif
      printf("    .%scomm ", sp->sclass == STATIC ? "l" : "");
      if (sp->slevel == 0)
            printf("%s,0%o", name, off);
      else
            printf(LABFMT ",0%o", sp->soffset, off);
      if (sp->sclass != STATIC) {
#if defined(ELFABI)
            printf(",%d", al);
#elif defined(MACHOABI)
            printf(",%d", ispow2(al));
#endif
      }
      printf("\n");
}

static char *
section2string(char *name, int len)
{
#if defined(ELFABI)
      char *s;
      int n;

      if (strncmp(name, "link_set", 8) == 0) {
            const char *postfix = ",\"aw\",@progbits";
            n = len + strlen(postfix) + 1;
            s = IALLOC(n);
            strlcpy(s, name, n);
            strlcat(s, postfix, n);
            return s;
      }
#endif

      return newstring(name, len);
}

char *nextsect;
#ifdef TLS
static int gottls;
#endif
static int stdcall;
#ifdef os_win32
static int dllindirect;
#endif
static char *alias;
static int constructor;
static int destructor;

/*
 * Give target the opportunity of handling pragmas.
 */
int
mypragma(char *str)
{
      char *a2 = pragtok(NULL);

#ifdef TLS
      if (strcmp(str, "tls") == 0 && a2 == NULL) {
            gottls = 1;
            return 1;
      }
#endif
      if (strcmp(str, "stdcall") == 0) {
            stdcall = 1;
            return 1;
      }
      if (strcmp(str, "cdecl") == 0) {
            stdcall = 0;
            return 1;
      }
#ifdef os_win32
      if (strcmp(str, "fastcall") == 0) {
            stdcall = 2;
            return 1;
      }
      if (strcmp(str, "dllimport") == 0) {
            dllindirect = 1;
            return 1;
      }
      if (strcmp(str, "dllexport") == 0) {
            dllindirect = 1;
            return 1;
      }
#endif
#ifndef AOUTABI
      if (strcmp(str, "constructor") == 0 || strcmp(str, "init") == 0) {
            constructor = 1;
            return 1;
      }
      if (strcmp(str, "destructor") == 0 || strcmp(str, "fini") == 0) {
            destructor = 1;
            return 1;
      }
#endif
      if (strcmp(str, "section") == 0 && a2 != NULL) {
            nextsect = section2string(a2, strlen(a2));
            return 1;
      }
      if (strcmp(str, "alias") == 0 && a2 != NULL) {
            alias = tmpstrdup(a2);
            return 1;
      }
      if (strcmp(str, "ident") == 0)
            return 1; /* Just ignore */

      return 0;
}

/*
 * Called when a identifier has been declared.
 */
void
fixdef(struct symtab *sp)
{
      struct attr *ap;
#ifdef TLS
      /* may have sanity checks here */
      if (gottls)
            sp->sflags |= STLS;
      gottls = 0;
#endif
      if ((ap = attr_find(sp->sap, GCC_ATYP_ALIAS)) != NULL) {
            char *an = ap->sarg(0);  
            char *sn = sp->soname ? sp->soname : sp->sname; 
            char *v;

            v = attr_find(sp->sap, GCC_ATYP_WEAK) ? "weak" : "globl";
            printf("\t.%s %s\n", v, sn);
            printf("\t.set %s,%s\n", sn, an);
      }     

      if (alias != NULL && (sp->sclass != PARAM)) {
            char *name;
            if ((name = sp->soname) == NULL)
                  name = exname(sp->sname);
            printf("\t.globl %s\n", name);
            printf("%s = ", name);
            printf("%s\n", exname(alias));
            alias = NULL;
      }
      if ((constructor || destructor) && (sp->sclass != PARAM)) {
#if defined(ELFABI)
            printf("\t.section .%ctors,\"aw\",@progbits\n",
                constructor ? 'c' : 'd');
#elif defined(PECOFFABI)
            printf("\t.section .%ctors,\"w\"\n",
                constructor ? 'c' : 'd');
#elif defined(MACHOABI)
            if (kflag) {
                  if (constructor)
                        printf("\t.mod_init_func\n");
                  else
                        printf("\t.mod_term_func\n");
            } else {
                  if (constructor)
                        printf("\t.constructor\n");
                  else
                        printf("\t.destructor\n");
            }
#elif defined(AOUTABI)
            uerror("constructor/destructor are not supported for this target");
#endif
            printf("\t.p2align 2\n");
            printf("\t.long %s\n", exname(sp->sname));
#ifdef MACHOABI
            printf("\t.text\n");
#else
            printf("\t.previous\n");
#endif
            constructor = destructor = 0;
      }
      if (stdcall && (sp->sclass != PARAM)) {
            sp->sflags |= SSTDCALL;
            stdcall = 0;
      }
#ifdef os_win32
      if (dllindirect && (sp->sclass != PARAM)) {
            sp->sflags |= SDLLINDIRECT;
            dllindirect = 0;
      }
#endif
}

NODE *
i386_builtin_return_address(NODE *f, NODE *a, TWORD rt)
{
      int nframes;

      if (a == NULL || a->n_op != ICON)
            goto bad;

      nframes = (int)a->n_lval;

      tfree(f);
      tfree(a);

      f = block(REG, NIL, NIL, PTR+VOID, 0, 0);
      regno(f) = FPREG;

      while (nframes--)
            f = block(UMUL, f, NIL, PTR+VOID, 0, 0);

      f = block(PLUS, f, bcon(4), INCREF(PTR+VOID), 0, 0);
      f = buildtree(UMUL, f, NIL);

      return f;
bad:
        uerror("bad argument to __builtin_return_address");
        return bcon(0);
}

NODE *
i386_builtin_frame_address(NODE *f, NODE *a, TWORD rt)
{
      int nframes;

      if (a == NULL || a->n_op != ICON)
            goto bad;

      nframes = (int)a->n_lval;

      tfree(f);
      tfree(a);

      f = block(REG, NIL, NIL, PTR+VOID, 0, 0);
      regno(f) = FPREG;

      while (nframes--)
            f = block(UMUL, f, NIL, PTR+VOID, 0, 0);

      return f;
bad:
        uerror("bad argument to __builtin_frame_address");
        return bcon(0);
}

/*
 *  Postfix external functions with the arguments size.
 */
static void
mangle(NODE *p)
{
      NODE *l;

      if (p->n_op == NAME || p->n_op == ICON) {
            p->n_flags = 0; /* for later setting of STDCALL */
            if (p->n_sp) {
                   if (p->n_sp->sflags & SSTDCALL)
                        p->n_flags = FSTDCALL;
            }
      } else if (p->n_op == TEMP)
            p->n_flags = 0; /* STDCALL fun ptr not allowed */

      if (p->n_op != CALL && p->n_op != STCALL &&
          p->n_op != UCALL && p->n_op != USTCALL)
            return;

      p->n_flags = 0;

      l = p->n_left;
      while (cdope(l->n_op) & CALLFLG)
            l = l->n_left;
      if (l->n_op == TEMP)
            return;
      if (l->n_op == ADDROF)
            l = l->n_left;
      if (l->n_sp == NULL)
            return;
#ifdef GCC_COMPAT
      if (attr_find(l->n_sp->sap, GCC_ATYP_STDCALL) != NULL)
            l->n_sp->sflags |= SSTDCALL;
#endif
#ifdef os_win32
      if (l->n_sp->sflags & SSTDCALL) {
            if (strchr(l->n_name, '@') == NULL) {
                  int size = 0;
                  char buf[256];
                  NODE *r;
                  TWORD t;

                  if (p->n_op == CALL || p->n_op == STCALL) {
                        for (r = p->n_right;    
                            r->n_op == CM; r = r->n_left) {
                              t = r->n_type;
                              if (t == STRTY || t == UNIONTY)
                                    size += tsize(t, r->n_df, r->n_ap);
                              else
                                    size += szty(t) * SZINT / SZCHAR;
                        }
                        t = r->n_type;
                        if (t == STRTY || t == UNIONTY)
                              size += tsize(t, r->n_df, r->n_ap);
                        else
                              size += szty(t) * SZINT / SZCHAR;
                  }
                  snprintf(buf, 256, "%s@%d", l->n_name, size);
                  l->n_name = IALLOC(strlen(buf) + 1);
                  strcpy(l->n_name, buf);
            }
      }
#endif
}

void
pass1_lastchance(struct interpass *ip)
{
      if (ip->type == IP_NODE &&
          (ip->ip_node->n_op == CALL || ip->ip_node->n_op == UCALL) &&
          ISFTY(ip->ip_node->n_type))
            ip->ip_node->n_flags = FFPPOP;
 
      if (ip->type == IP_EPILOG) {
            struct interpass_prolog *ipp = (struct interpass_prolog *)ip;
            ipp->ipp_argstacksize = argstacksize;
      }
}

Generated by  Doxygen 1.6.0   Back to index