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- /*
- * File: locIdent.c
- * Purpose: support routines for high-level local identifier definitions.
- * Date: October 1993
- * (C) Cristina Cifuentes
- */
- #include "dcc.h"
- #include <string.h>
- #define LOCAL_ID_DELTA 25
- #define IDX_ARRAY_DELTA 5
- void insertIdx (IDX_ARRAY *list, Int idx)
- /* Inserts the new index at the end of the list. If there is need to
- * allocate extra storage, it does so. */
- {
- if (list->csym == list->alloc)
- {
- list->alloc += IDX_ARRAY_DELTA;
- list->idx = (Int*)reallocVar(list->idx, list->alloc * sizeof(Int));
- memset (&list->idx[list->csym], 0, IDX_ARRAY_DELTA * sizeof(Int));
- }
- list->idx[list->csym] = idx;
- list->csym++;
- }
- static boolT inList (IDX_ARRAY *list, Int idx)
- /* Returns whether idx is in the list array or not */
- { Int i;
- for (i = 0; i < list->csym; i++)
- if (list->idx[i] == idx)
- return (TRUE);
- return (FALSE);
- }
- static void newIdent (LOCAL_ID *locSym, hlType t, frameType f)
- /* Creates a new identifier node of type t and returns it.
- * Arguments: locSym : local long symbol table
- * t : type of LONG identifier
- * f : frame where this variable is located
- * ix : index into icode array where this var is used */
- {
- if (locSym->csym == locSym->alloc)
- {
- locSym->alloc += LOCAL_ID_DELTA;
- locSym->id = (ID*)reallocVar(locSym->id, locSym->alloc * sizeof(ID));
- memset (&locSym->id[locSym->csym], 0, LOCAL_ID_DELTA * sizeof(ID));
- }
- locSym->id[locSym->csym].type = t;
- locSym->id[locSym->csym].loc = f;
- locSym->csym++;
- }
- Int newByteWordRegId (LOCAL_ID *locSym, hlType t, byte regi)
- /* Creates a new register identifier node of TYPE_BYTE_(UN)SIGN or
- * TYPE_WORD_(UN)SIGN type. Returns the index to this new entry. */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if ((locSym->id[idx].type == t) &&
- (locSym->id[idx].id.regi == regi))
- return (idx);
- }
- /* Not in table, create new identifier */
- newIdent (locSym, t, REG_FRAME);
- idx = locSym->csym - 1;
- locSym->id[idx].id.regi = regi;
- return (idx);
- }
- static void flagByteWordId (LOCAL_ID *locsym, Int off)
- /* Flags the entry associated with the offset off to illegal, as this
- * offset is part of a long stack variable.
- * Note: it is easier enough to remove this entry by moving the rest of
- * the array 1 position. The problem is that indexes into this
- * array have already been saved in several positions; therefore,
- * flagging this entry as illegal is all that can be done. */
- { Int idx;
- for (idx = 0; idx < locsym->csym; idx++)
- {
- if (((locsym->id[idx].type == TYPE_WORD_SIGN) ||
- (locsym->id[idx].type == TYPE_BYTE_SIGN)) &&
- (locsym->id[idx].id.bwId.off == off) &&
- (locsym->id[idx].id.bwId.regOff == 0))
- {
- locsym->id[idx].illegal = TRUE;
- break;
- }
- }
- }
- Int newByteWordStkId (LOCAL_ID *locSym, hlType t, Int off, byte regOff)
- /* Creates a new stack identifier node of TYPE_BYTE_(UN)SIGN or
- * TYPE_WORD_(UN)SIGN type. Returns the index to this new entry. */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if ((locSym->id[idx].id.bwId.off == off) &&
- (locSym->id[idx].id.bwId.regOff == regOff))
- return (idx);
- }
- /* Not in table, create new identifier */
- newIdent (locSym, t, STK_FRAME);
- idx = locSym->csym - 1;
- locSym->id[idx].id.bwId.regOff = regOff;
- locSym->id[idx].id.bwId.off = off;
- return (idx);
- }
- Int newIntIdxId (LOCAL_ID *locSym, int16 seg, int16 off, byte regi,
- Int ix, hlType t)
- /* Checks if the entry exists in the locSym, if so, returns the idx to this
- * entry; otherwise creates a new global identifier node of type
- * TYPE_WORD_(UN)SIGN and returns the index to this new entry.
- * Arguments: locSym : ptr to the local symbol table
- * seg: segment value for global variable
- * off: offset from segment
- * regi: indexed register into global variable
- * ix: index into icode array
- * t: HIGH_LEVEL type */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if (/*(locSym->id[idx].type == t) && Not checking type */
- (locSym->id[idx].id.bwGlb.seg == seg) &&
- (locSym->id[idx].id.bwGlb.off == off) &&
- (locSym->id[idx].id.bwGlb.regi == regi))
- return (idx);
- }
- /* Not in the table, create new identifier */
- newIdent (locSym, t, GLB_FRAME);
- idx = locSym->csym - 1;
- locSym->id[idx].id.bwGlb.seg = seg;
- locSym->id[idx].id.bwGlb.off = off;
- locSym->id[idx].id.bwGlb.regi = regi;
- return (idx);
- }
- Int newLongRegId (LOCAL_ID *locSym, hlType t, byte regH, byte regL, Int ix)
- /* Checks if the entry exists in the locSym, if so, returns the idx to this
- * entry; otherwise creates a new register identifier node of type
- * TYPE_LONG_(UN)SIGN and returns the index to this new entry. */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if (/*(locSym->id[idx].type == t) && Not checking type */
- (locSym->id[idx].id.longId.h == regH) &&
- (locSym->id[idx].id.longId.l == regL))
- {
- /* Check for occurrence in the list */
- if (inList (&locSym->id[idx].idx, ix))
- return (idx);
- else
- {
- /* Insert icode index in list */
- insertIdx (&locSym->id[idx].idx, ix);
- return (idx);
- }
- }
- }
- /* Not in the table, create new identifier */
- newIdent (locSym, t, REG_FRAME);
- insertIdx (&locSym->id[locSym->csym-1].idx, ix);
- idx = locSym->csym - 1;
- locSym->id[idx].id.longId.h = regH;
- locSym->id[idx].id.longId.l = regL;
- return (idx);
- }
- static Int newLongGlbId (LOCAL_ID *locSym, int16 seg, int16 offH, int16 offL,
- Int ix, hlType t)
- /* Checks if the entry exists in the locSym, if so, returns the idx to this
- * entry; otherwise creates a new global identifier node of type
- * TYPE_LONG_(UN)SIGN and returns the index to this new entry. */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if (/*(locSym->id[idx].type == t) && Not checking type */
- (locSym->id[idx].id.longGlb.seg == seg) &&
- (locSym->id[idx].id.longGlb.offH == offH) &&
- (locSym->id[idx].id.longGlb.offL == offL))
- return (idx);
- }
- /* Not in the table, create new identifier */
- newIdent (locSym, t, GLB_FRAME);
- idx = locSym->csym - 1;
- locSym->id[idx].id.longGlb.seg = seg;
- locSym->id[idx].id.longGlb.offH = offH;
- locSym->id[idx].id.longGlb.offL = offL;
- return (idx);
- }
- static Int newLongIdxId (LOCAL_ID *locSym, int16 seg, int16 offH, int16 offL,
- byte regi, Int ix, hlType t)
- /* Checks if the entry exists in the locSym, if so, returns the idx to this
- * entry; otherwise creates a new global identifier node of type
- * TYPE_LONG_(UN)SIGN and returns the index to this new entry. */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if (/*(locSym->id[idx].type == t) && Not checking type */
- (locSym->id[idx].id.longGlb.seg == seg) &&
- (locSym->id[idx].id.longGlb.offH == offH) &&
- (locSym->id[idx].id.longGlb.offL == offL) &&
- (locSym->id[idx].id.longGlb.regi == regi))
- return (idx);
- }
- /* Not in the table, create new identifier */
- newIdent (locSym, t, GLB_FRAME);
- idx = locSym->csym - 1;
- locSym->id[idx].id.longGlb.seg = seg;
- locSym->id[idx].id.longGlb.offH = offH;
- locSym->id[idx].id.longGlb.offL = offL;
- locSym->id[idx].id.longGlb.regi = regi;
- return (idx);
- }
- Int newLongStkId (LOCAL_ID *locSym, hlType t, Int offH, Int offL)
- /* Creates a new stack identifier node of type TYPE_LONG_(UN)SIGN.
- * Returns the index to this entry. */
- { Int idx;
- /* Check for entry in the table */
- for (idx = 0; idx < locSym->csym; idx++)
- {
- if ((locSym->id[idx].type == t) &&
- (locSym->id[idx].id.longStkId.offH == offH) &&
- (locSym->id[idx].id.longStkId.offL == offL))
- return (idx);
- }
- /* Not in the table; flag as invalid offH and offL */
- flagByteWordId (locSym, offH);
- flagByteWordId (locSym, offL);
- /* Create new identifier */
- newIdent (locSym, t, STK_FRAME);
- idx = locSym->csym - 1;
- locSym->id[idx].id.longStkId.offH = offH;
- locSym->id[idx].id.longStkId.offL = offL;
- return (idx);
- }
- Int newLongId (LOCAL_ID *locSym, opLoc sd, PICODE pIcode, hlFirst f, Int ix,
- operDu du, Int off)
- /* Returns the index to an appropriate long identifier.
- * Note: long constants should be checked first and stored as a long integer
- * number in an expression record. */
- { Int idx;
- PMEM pmH, pmL;
- if (f == LOW_FIRST)
- {
- pmL = (sd == SRC) ? &pIcode->ic.ll.src : &pIcode->ic.ll.dst;
- pmH = (sd == SRC) ? &(pIcode+off)->ic.ll.src : &(pIcode+off)->ic.ll.dst;
- }
- else /* HIGH_FIRST */
- {
- pmH = (sd == SRC) ? &pIcode->ic.ll.src : &pIcode->ic.ll.dst;
- pmL = (sd == SRC) ? &(pIcode+off)->ic.ll.src : &(pIcode+off)->ic.ll.dst;
- }
- if (pmL->regi == 0) /* global variable */
- idx = newLongGlbId (locSym, pmH->segValue, pmH->off, pmL->off, ix,
- TYPE_LONG_SIGN);
- else if (pmL->regi < INDEXBASE) /* register */
- {
- idx = newLongRegId (locSym, TYPE_LONG_SIGN, pmH->regi, pmL->regi, ix);
- if (f == HIGH_FIRST)
- setRegDU (pIcode, pmL->regi, du); /* low part */
- else
- setRegDU (pIcode, pmH->regi, du); /* high part */
- }
- else if (pmL->off) { /* offset */
- if ((pmL->seg == rSS) && (pmL->regi == INDEXBASE + 6)) /* idx on bp */
- idx = newLongStkId (locSym, TYPE_LONG_SIGN, pmH->off, pmL->off);
- else if ((pmL->seg == rDS) && (pmL->regi == INDEXBASE + 7)) /* bx */
- { /* glb var indexed on bx */
- idx = newLongIdxId (locSym, pmH->segValue, pmH->off, pmL->off,
- rBX, ix, TYPE_LONG_SIGN);
- setRegDU (pIcode, rBX, E_USE);
- }
- else /* idx <> bp, bx */
- printf ("long not supported, idx <> bp\n");
- }
- else /* (pm->regi >= INDEXBASE && pm->off = 0) => indexed && no off */
- printf ("long not supported, idx && no off\n");
- return (idx);
- }
- boolT checkLongEq (LONG_STKID_TYPE longId, PICODE pIcode, Int i, Int idx,
- PPROC pProc, COND_EXPR **rhs, COND_EXPR **lhs, Int off)
- /* Checks whether the long stack identifier is equivalent to the source or
- * destination operands of pIcode and pIcode+1 (ie. these are LOW_LEVEL
- * icodes at present). If so, returns the rhs and lhs of this instruction.
- * Arguments: longId : long stack identifier
- * pIcode : ptr to first LOW_LEVEL icode instruction
- * i : idx into local identifier table for longId
- * idx : idx into icode array
- * pProc : ptr to current procedure record
- * rhs, lhs : return expressions if successful. */
- { PMEM pmHdst, pmLdst, pmHsrc, pmLsrc; /* pointers to LOW_LEVEL icodes */
- pmHdst = &pIcode->ic.ll.dst;
- pmLdst = &(pIcode+off)->ic.ll.dst;
- pmHsrc = &pIcode->ic.ll.src;
- pmLsrc = &(pIcode+off)->ic.ll.src;
- if ((longId.offH == pmHdst->off) && (longId.offL == pmLdst->off))
- {
- *lhs = idCondExpLongIdx (i);
- if ((pIcode->ic.ll.flg & NO_SRC) != NO_SRC)
- *rhs = idCondExpLong (&pProc->localId, SRC, pIcode, HIGH_FIRST,
- idx, E_USE, off);
- return (TRUE);
- }
- else if ((longId.offH == pmHsrc->off) && (longId.offL == pmLsrc->off))
- {
- *lhs = idCondExpLong (&pProc->localId, DST, pIcode, HIGH_FIRST, idx,
- E_DEF, off);
- *rhs = idCondExpLongIdx (i);
- return (TRUE);
- }
- return (FALSE);
- }
- boolT checkLongRegEq (LONGID_TYPE longId, PICODE pIcode, Int i, Int idx,
- PPROC pProc, COND_EXPR **rhs, COND_EXPR **lhs, Int off)
- /* Checks whether the long stack identifier is equivalent to the source or
- * destination operands of pIcode and pIcode+1 (ie. these are LOW_LEVEL
- * icodes at present). If so, returns the rhs and lhs of this instruction.
- * Arguments: longId : long stack identifier
- * pIcode : ptr to first LOW_LEVEL icode instruction
- * i : idx into local identifier table for longId
- * idx : idx into icode array
- * pProc : ptr to current procedure record
- * rhs, lhs : return expressions if successful. */
- { PMEM pmHdst, pmLdst, pmHsrc, pmLsrc; /* pointers to LOW_LEVEL icodes */
- pmHdst = &pIcode->ic.ll.dst;
- pmLdst = &(pIcode+off)->ic.ll.dst;
- pmHsrc = &pIcode->ic.ll.src;
- pmLsrc = &(pIcode+off)->ic.ll.src;
- if ((longId.h == pmHdst->regi) && (longId.l == pmLdst->regi))
- {
- *lhs = idCondExpLongIdx (i);
- if ((pIcode->ic.ll.flg & NO_SRC) != NO_SRC)
- *rhs = idCondExpLong (&pProc->localId, SRC, pIcode, HIGH_FIRST,
- idx, E_USE, off);
- return (TRUE);
- }
- else if ((longId.h == pmHsrc->regi) && (longId.l == pmLsrc->regi))
- {
- *lhs = idCondExpLong (&pProc->localId, DST, pIcode, HIGH_FIRST, idx,
- E_DEF, off);
- *rhs = idCondExpLongIdx (i);
- return (TRUE);
- }
- return (FALSE);
- }
- byte otherLongRegi (byte regi, Int idx, LOCAL_ID *locTbl)
- /* Given an index into the local identifier table for a long register
- * variable, determines whether regi is the high or low part, and returns
- * the other part */
- { ID *id;
- id = &locTbl->id[idx];
- if ((id->loc == REG_FRAME) && ((id->type == TYPE_LONG_SIGN) ||
- (id->type == TYPE_LONG_UNSIGN)))
- {
- if (id->id.longId.h == regi)
- return (id->id.longId.l);
- else if (id->id.longId.l == regi)
- return (id->id.longId.h);
- }
- return 0; // Cristina: please check this!
- }
- void propLongId (LOCAL_ID *locid, byte regL, byte regH, char *name)
- /* Checks if the registers regL and regH have been used independently in
- * the local identifier table. If so, macros for these registers are
- * placed in the local identifier table, as these registers belong to a
- * long register identifier. */
- { Int i;
- ID *id;
- for (i = 0; i < locid->csym; i++)
- {
- id = &locid->id[i];
- if ((id->type == TYPE_WORD_SIGN) || (id->type == TYPE_WORD_UNSIGN))
- {
- if (id->id.regi == regL)
- {
- strcpy (id->name, name);
- strcpy (id->macro, "LO");
- id->hasMacro = TRUE;
- id->illegal = TRUE;
- }
- else if (id->id.regi == regH)
- {
- strcpy (id->name, name);
- strcpy (id->macro, "HI");
- id->hasMacro = TRUE;
- id->illegal = TRUE;
- }
- }
- }
- }
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