535 lines
11 KiB
C
535 lines
11 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cpp.h"
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/*
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* do a macro definition. tp points to the name being defined in the line
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*/
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void
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dodefine(Tokenrow *trp)
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{
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Token *tp;
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Nlist *np;
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Tokenrow *def, *args;
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int dots;
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dots = 0;
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tp = trp->tp+1;
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if (tp>=trp->lp || tp->type!=NAME) {
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error(ERROR, "#defined token is not a name");
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return;
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}
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np = lookup(tp, 1);
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if (np->flag&ISUNCHANGE) {
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error(ERROR, "#defined token %t can't be redefined", tp);
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return;
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}
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/* collect arguments */
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tp += 1;
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args = NULL;
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if (tp<trp->lp && tp->type==LP && tp->wslen==0) {
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/* macro with args */
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int narg = 0;
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tp += 1;
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args = new(Tokenrow);
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maketokenrow(2, args);
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if (tp->type!=RP) {
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int err = 0;
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for (;;) {
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Token *atp;
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if (tp->type == ELLIPS)
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dots++;
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else if (tp->type!=NAME) {
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err++;
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break;
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}
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if (narg>=args->max)
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growtokenrow(args);
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for (atp=args->bp; atp<args->lp; atp++)
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if (atp->len==tp->len
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&& strncmp((char*)atp->t, (char*)tp->t, tp->len)==0)
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error(ERROR, "Duplicate macro argument");
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*args->lp++ = *tp;
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narg++;
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tp += 1;
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if (tp->type==RP)
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break;
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if (dots)
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error(ERROR, "arguments after '...' in macro");
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if (tp->type!=COMMA) {
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err++;
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break;
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}
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tp += 1;
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}
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if (err) {
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error(ERROR, "Syntax error in macro parameters");
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return;
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}
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}
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tp += 1;
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}
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trp->tp = tp;
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if (((trp->lp)-1)->type==NL)
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trp->lp -= 1;
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def = normtokenrow(trp);
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if (np->flag&ISDEFINED) {
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if (comparetokens(def, np->vp)
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|| (np->ap==NULL) != (args==NULL)
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|| np->ap && comparetokens(args, np->ap))
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error(ERROR, "Macro redefinition of %t", trp->bp+2);
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}
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if (args) {
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Tokenrow *tap;
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tap = normtokenrow(args);
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dofree(args->bp);
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args = tap;
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}
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np->ap = args;
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np->vp = def;
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np->flag |= ISDEFINED;
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if(dots)
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np->flag |= ISVARMAC;
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}
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/*
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* Definition received via -D or -U
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*/
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void
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doadefine(Tokenrow *trp, int type)
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{
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Nlist *np;
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static unsigned char one[] = "1";
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static Token onetoken[1] = {{ NUMBER, 0, 0, 0, 1, one }};
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static Tokenrow onetr = { onetoken, onetoken, onetoken+1, 1 };
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trp->tp = trp->bp;
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if (type=='U') {
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if (trp->lp-trp->tp != 2 || trp->tp->type!=NAME)
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goto syntax;
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if ((np = lookup(trp->tp, 0)) == NULL)
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return;
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np->flag &= ~ISDEFINED;
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return;
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}
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if (trp->tp >= trp->lp || trp->tp->type!=NAME)
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goto syntax;
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np = lookup(trp->tp, 1);
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np->flag |= ISDEFINED;
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trp->tp += 1;
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if (trp->tp >= trp->lp || trp->tp->type==END) {
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np->vp = &onetr;
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return;
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}
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if (trp->tp->type!=ASGN)
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goto syntax;
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trp->tp += 1;
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if ((trp->lp-1)->type == END)
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trp->lp -= 1;
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np->vp = normtokenrow(trp);
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return;
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syntax:
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error(FATAL, "Illegal -D or -U argument %r", trp);
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}
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/*
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* Do macro expansion in a row of tokens.
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* Flag is NULL if more input can be gathered.
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*/
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void
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expandrow(Tokenrow *trp, char *flag, int inmacro)
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{
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Token *tp;
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Nlist *np;
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if (flag)
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setsource(flag, NULL, "");
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for (tp = trp->tp; tp<trp->lp; ) {
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if (tp->type!=NAME
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|| quicklook(tp->t[0], tp->len>1?tp->t[1]:0)==0
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|| (np = lookup(tp, 0))==NULL
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|| (np->flag&(ISDEFINED|ISMAC))==0
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|| tp->hideset && checkhideset(tp->hideset, np)) {
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tp++;
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continue;
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}
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trp->tp = tp;
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if (np->val==KDEFINED) {
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tp->type = DEFINED;
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if ((tp+1)<trp->lp && (tp+1)->type==NAME)
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(tp+1)->type = NAME1;
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else if ((tp+3)<trp->lp && (tp+1)->type==LP
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&& (tp+2)->type==NAME && (tp+3)->type==RP)
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(tp+2)->type = NAME1;
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else
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error(ERROR, "Incorrect syntax for `defined'");
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tp++;
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continue;
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}
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if (np->flag&ISMAC)
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builtin(trp, np->val);
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else {
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expand(trp, np, inmacro);
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}
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tp = trp->tp;
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}
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if (flag)
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unsetsource();
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}
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/*
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* Expand the macro whose name is np, at token trp->tp, in the tokenrow.
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* Return trp->tp at the first token next to be expanded
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* (ordinarily the beginning of the expansion)
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*/
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void
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expand(Tokenrow *trp, Nlist *np, int inmacro)
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{
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Tokenrow ntr;
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int ntokc, narg, i;
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Token *tp;
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Tokenrow *atr[NARG+1];
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int hs;
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copytokenrow(&ntr, np->vp); /* copy macro value */
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if (np->ap==NULL) /* parameterless */
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ntokc = 1;
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else {
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ntokc = gatherargs(trp, atr, (np->flag&ISVARMAC) ? rowlen(np->ap) : 0, &narg);
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if (narg<0) { /* not actually a call (no '(') */
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/* error(WARNING, "%d %r\n", narg, trp); */
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/* gatherargs has already pushed trp->tr to the next token */
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return;
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}
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if (narg != rowlen(np->ap)) {
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error(ERROR, "Disagreement in number of macro arguments");
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trp->tp->hideset = newhideset(trp->tp->hideset, np);
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trp->tp += ntokc;
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return;
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}
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substargs(np, &ntr, atr); /* put args into replacement */
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for (i=0; i<narg; i++) {
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dofree(atr[i]->bp);
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dofree(atr[i]);
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}
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}
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if(!inmacro)
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doconcat(&ntr); /* execute ## operators */
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hs = newhideset(trp->tp->hideset, np);
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for (tp=ntr.bp; tp<ntr.lp; tp++) { /* distribute hidesets */
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if (tp->type==NAME) {
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if (tp->hideset==0)
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tp->hideset = hs;
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else
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tp->hideset = unionhideset(tp->hideset, hs);
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}
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}
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ntr.tp = ntr.bp;
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insertrow(trp, ntokc, &ntr);
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trp->tp -= rowlen(&ntr);
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dofree(ntr.bp);
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return;
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}
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/*
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* Gather an arglist, starting in trp with tp pointing at the macro name.
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* Return total number of tokens passed, stash number of args found.
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* trp->tp is not changed relative to the tokenrow.
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*/
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int
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gatherargs(Tokenrow *trp, Tokenrow **atr, int dots, int *narg)
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{
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int parens = 1;
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int ntok = 0;
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Token *bp, *lp;
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Tokenrow ttr;
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int ntokp;
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int needspace;
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*narg = -1; /* means that there is no macro call */
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/* look for the ( */
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for (;;) {
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trp->tp++;
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ntok++;
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if (trp->tp >= trp->lp) {
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gettokens(trp, 0);
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if ((trp->lp-1)->type==END) {
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/* error(WARNING, "reach END\n"); */
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trp->lp -= 1;
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if (*narg>=0)
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trp->tp -= ntok;
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return ntok;
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}
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}
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if (trp->tp->type==LP)
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break;
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if (trp->tp->type!=NL)
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return ntok;
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}
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*narg = 0;
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ntok++;
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ntokp = ntok;
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trp->tp++;
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/* search for the terminating ), possibly extending the row */
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needspace = 0;
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while (parens>0) {
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if (trp->tp >= trp->lp)
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gettokens(trp, 0);
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if (needspace) {
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needspace = 0;
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makespace(trp);
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}
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if (trp->tp->type==END) {
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trp->lp -= 1;
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trp->tp -= ntok;
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error(ERROR, "EOF in macro arglist");
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return ntok;
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}
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if (trp->tp->type==NL) {
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trp->tp += 1;
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adjustrow(trp, -1);
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trp->tp -= 1;
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makespace(trp);
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needspace = 1;
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continue;
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}
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if (trp->tp->type==LP)
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parens++;
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else if (trp->tp->type==RP)
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parens--;
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trp->tp++;
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ntok++;
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}
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trp->tp -= ntok;
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/* Now trp->tp won't move underneath us */
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lp = bp = trp->tp+ntokp;
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for (; parens>=0; lp++) {
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if (lp->type == LP) {
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parens++;
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continue;
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}
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if (lp->type==RP)
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parens--;
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if (lp->type==DSHARP)
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lp->type = DSHARP1; /* ## not special in arg */
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if ((lp->type==COMMA && parens==0) || (parens<0 && (lp-1)->type!=LP)) {
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if (lp->type == COMMA && dots && *narg == dots-1)
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continue;
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if (*narg>=NARG-1)
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error(FATAL, "Sorry, too many macro arguments");
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ttr.bp = ttr.tp = bp;
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ttr.lp = lp;
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atr[(*narg)++] = normtokenrow(&ttr);
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bp = lp+1;
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}
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}
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return ntok;
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}
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/*
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* substitute the argument list into the replacement string
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* This would be simple except for ## and #
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*/
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void
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substargs(Nlist *np, Tokenrow *rtr, Tokenrow **atr)
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{
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Tokenrow tatr;
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Token *tp;
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int ntok, argno;
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for (rtr->tp=rtr->bp; rtr->tp<rtr->lp; ) {
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if (rtr->tp->type==SHARP) { /* string operator */
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tp = rtr->tp;
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rtr->tp += 1;
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if ((argno = lookuparg(np, rtr->tp))<0) {
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error(ERROR, "# not followed by macro parameter");
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continue;
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}
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ntok = 1 + (rtr->tp - tp);
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rtr->tp = tp;
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insertrow(rtr, ntok, stringify(atr[argno]));
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continue;
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}
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if (rtr->tp->type==NAME
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&& (argno = lookuparg(np, rtr->tp)) >= 0) {
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if (rtr->tp < rtr->bp)
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error(ERROR, "access out of bounds");
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if ((rtr->tp+1)<rtr->lp && (rtr->tp+1)->type==DSHARP /* don't look beyond end */
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|| rtr->tp!=rtr->bp && (rtr->tp-1)->type==DSHARP) /* don't look before beginning */
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insertrow(rtr, 1, atr[argno]);
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else {
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copytokenrow(&tatr, atr[argno]);
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expandrow(&tatr, "<macro>", Inmacro);
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insertrow(rtr, 1, &tatr);
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dofree(tatr.bp);
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}
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continue;
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}
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rtr->tp++;
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}
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}
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/*
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* Evaluate the ## operators in a tokenrow
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*/
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void
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doconcat(Tokenrow *trp)
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{
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Token *ltp, *ntp;
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Tokenrow ntr;
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int len;
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for (trp->tp=trp->bp; trp->tp<trp->lp; trp->tp++) {
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if (trp->tp->type==DSHARP1)
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trp->tp->type = DSHARP;
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else if (trp->tp->type==DSHARP) {
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char tt[128];
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ltp = trp->tp-1;
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ntp = trp->tp+1;
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if (ltp<trp->bp || ntp>=trp->lp) {
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error(ERROR, "## occurs at border of replacement");
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continue;
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}
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len = ltp->len + ntp->len;
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strncpy((char*)tt, (char*)ltp->t, ltp->len);
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strncpy((char*)tt+ltp->len, (char*)ntp->t, ntp->len);
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tt[len] = '\0';
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setsource("<##>", NULL, tt);
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maketokenrow(3, &ntr);
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gettokens(&ntr, 1);
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unsetsource();
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if (ntr.lp-ntr.bp!=2 || ntr.bp->type==UNCLASS)
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error(WARNING, "Bad token %r produced by ##", &ntr);
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ntr.lp = ntr.bp+1;
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trp->tp = ltp;
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makespace(&ntr);
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insertrow(trp, (ntp-ltp)+1, &ntr);
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dofree(ntr.bp);
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trp->tp--;
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}
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}
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}
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/*
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* tp is a potential parameter name of macro mac;
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* look it up in mac's arglist, and if found, return the
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* corresponding index in the argname array. Return -1 if not found.
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*/
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int
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lookuparg(Nlist *mac, Token *tp)
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{
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Token *ap;
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if (tp->type!=NAME || mac->ap==NULL)
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return -1;
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if((mac->flag & ISVARMAC) && strcmp((char*)tp->t, "__VA_ARGS__") == 0)
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return rowlen(mac->ap) - 1;
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for (ap=mac->ap->bp; ap<mac->ap->lp; ap++) {
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if (ap->len==tp->len && strncmp((char*)ap->t,(char*)tp->t,ap->len)==0)
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return ap - mac->ap->bp;
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}
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return -1;
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}
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/*
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* Return a quoted version of the tokenrow (from # arg)
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*/
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#define STRLEN 512
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Tokenrow *
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stringify(Tokenrow *vp)
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{
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static Token t = { STRING };
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static Tokenrow tr = { &t, &t, &t+1, 1 };
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Token *tp;
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uchar s[STRLEN];
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uchar *sp = s, *cp;
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int i, instring;
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*sp++ = '"';
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for (tp = vp->bp; tp < vp->lp; tp++) {
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instring = tp->type==STRING || tp->type==CCON;
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if (sp+2*tp->len >= &s[STRLEN-10]) {
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error(ERROR, "Stringified macro arg is too long");
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break;
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}
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if (tp->wslen /* && (tp->flag&XPWS)==0 */)
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*sp++ = ' ';
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for (i=0, cp=tp->t; i<tp->len; i++) {
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if (instring && (*cp=='"' || *cp=='\\'))
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*sp++ = '\\';
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*sp++ = *cp++;
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}
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}
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*sp++ = '"';
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*sp = '\0';
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sp = s;
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t.len = strlen((char*)sp);
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t.t = newstring(sp, t.len, 0);
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return &tr;
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}
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/*
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* expand a builtin name
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*/
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void
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builtin(Tokenrow *trp, int biname)
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{
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char *op;
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Token *tp;
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Source *s;
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tp = trp->tp;
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trp->tp++;
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/* need to find the real source */
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s = cursource;
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while (s && s->fd==NULL)
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s = s->next;
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if (s==NULL)
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s = cursource;
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/* most are strings */
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tp->type = STRING;
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if (tp->wslen) {
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*outptr++ = ' ';
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tp->wslen = 1;
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}
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op = outptr;
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*op++ = '"';
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switch (biname) {
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case KLINENO:
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tp->type = NUMBER;
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op = outnum(op-1, s->line);
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break;
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case KFILE: {
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char *src = s->filename;
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while ((*op++ = *src++) != 0)
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if (src[-1] == '\\')
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*op++ = '\\';
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op--;
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break;
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}
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case KDATE:
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strncpy(op, curtime+4, 7);
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strncpy(op+7, curtime+20, 4);
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op += 11;
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break;
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case KTIME:
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strncpy(op, curtime+11, 8);
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op += 8;
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break;
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default:
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error(ERROR, "cpp botch: unknown internal macro");
|
|
return;
|
|
}
|
|
if (tp->type==STRING)
|
|
*op++ = '"';
|
|
tp->t = (uchar*)outptr;
|
|
tp->len = op - outptr;
|
|
outptr = op;
|
|
}
|