531 lines
9.8 KiB
C
531 lines
9.8 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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#define NSTAK 32
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#define SGN 0
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#define UNS 1
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#define UND 2
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#define UNSMARK 0x1000
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struct value {
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long val;
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int type;
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};
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/* conversion types */
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#define RELAT 1
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#define ARITH 2
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#define LOGIC 3
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#define SPCL 4
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#define SHIFT 5
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#define UNARY 6
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/* operator priority, arity, and conversion type, indexed by tokentype */
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struct pri {
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char pri;
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char arity;
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char ctype;
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} priority[] = {
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{ 0, 0, 0 }, /* END */
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{ 0, 0, 0 }, /* UNCLASS */
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{ 0, 0, 0 }, /* NAME */
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{ 0, 0, 0 }, /* NUMBER */
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{ 0, 0, 0 }, /* STRING */
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{ 0, 0, 0 }, /* CCON */
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{ 0, 0, 0 }, /* NL */
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{ 0, 0, 0 }, /* WS */
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{ 0, 0, 0 }, /* DSHARP */
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{ 11, 2, RELAT }, /* EQ */
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{ 11, 2, RELAT }, /* NEQ */
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{ 12, 2, RELAT }, /* LEQ */
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{ 12, 2, RELAT }, /* GEQ */
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{ 13, 2, SHIFT }, /* LSH */
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{ 13, 2, SHIFT }, /* RSH */
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{ 7, 2, LOGIC }, /* LAND */
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{ 6, 2, LOGIC }, /* LOR */
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{ 0, 0, 0 }, /* PPLUS */
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{ 0, 0, 0 }, /* MMINUS */
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{ 0, 0, 0 }, /* ARROW */
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{ 0, 0, 0 }, /* SBRA */
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{ 0, 0, 0 }, /* SKET */
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{ 3, 0, 0 }, /* LP */
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{ 3, 0, 0 }, /* RP */
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{ 0, 0, 0 }, /* DOT */
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{ 10, 2, ARITH }, /* AND */
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{ 15, 2, ARITH }, /* STAR */
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{ 14, 2, ARITH }, /* PLUS */
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{ 14, 2, ARITH }, /* MINUS */
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{ 16, 1, UNARY }, /* TILDE */
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{ 16, 1, UNARY }, /* NOT */
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{ 15, 2, ARITH }, /* SLASH */
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{ 15, 2, ARITH }, /* PCT */
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{ 12, 2, RELAT }, /* LT */
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{ 12, 2, RELAT }, /* GT */
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{ 9, 2, ARITH }, /* CIRC */
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{ 8, 2, ARITH }, /* OR */
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{ 5, 2, SPCL }, /* QUEST */
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{ 5, 2, SPCL }, /* COLON */
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{ 0, 0, 0 }, /* ASGN */
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{ 4, 2, 0 }, /* COMMA */
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{ 0, 0, 0 }, /* SHARP */
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{ 0, 0, 0 }, /* SEMIC */
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{ 0, 0, 0 }, /* CBRA */
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{ 0, 0, 0 }, /* CKET */
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{ 0, 0, 0 }, /* ASPLUS */
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{ 0, 0, 0 }, /* ASMINUS */
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{ 0, 0, 0 }, /* ASSTAR */
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{ 0, 0, 0 }, /* ASSLASH */
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{ 0, 0, 0 }, /* ASPCT */
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{ 0, 0, 0 }, /* ASCIRC */
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{ 0, 0, 0 }, /* ASLSH */
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{ 0, 0, 0 }, /* ASRSH */
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{ 0, 0, 0 }, /* ASOR */
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{ 0, 0, 0 }, /* ASAND */
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{ 0, 0, 0 }, /* ELLIPS */
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{ 0, 0, 0 }, /* DSHARP1 */
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{ 0, 0, 0 }, /* NAME1 */
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{ 16, 1, UNARY }, /* DEFINED */
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{ 16, 0, UNARY }, /* UMINUS */
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};
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int evalop(struct pri);
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struct value tokval(Token *);
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struct value vals[NSTAK], *vp;
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enum toktype ops[NSTAK], *op;
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/*
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* Evaluate an #if #elif #ifdef #ifndef line. trp->tp points to the keyword.
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*/
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long
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eval(Tokenrow *trp, int kw)
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{
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Token *tp;
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Nlist *np;
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int ntok, rand;
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trp->tp++;
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if (kw==KIFDEF || kw==KIFNDEF) {
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if (trp->lp - trp->bp != 4 || trp->tp->type!=NAME) {
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error(ERROR, "Syntax error in #ifdef/#ifndef");
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return 0;
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}
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np = lookup(trp->tp, 0);
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return (kw==KIFDEF) == (np && np->flag&(ISDEFINED|ISMAC));
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}
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ntok = trp->tp - trp->bp;
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kwdefined->val = KDEFINED; /* activate special meaning of defined */
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expandrow(trp, "<if>", Notinmacro);
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kwdefined->val = NAME;
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vp = vals;
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op = ops;
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*op++ = END;
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for (rand=0, tp = trp->bp+ntok; tp < trp->lp; tp++) {
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switch(tp->type) {
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case WS:
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case NL:
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continue;
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/* nilary */
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case NAME:
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case NAME1:
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case NUMBER:
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case CCON:
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case STRING:
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if (rand)
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goto syntax;
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if (vp == &vals[NSTAK]) {
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error(ERROR, "Eval botch (stack overflow)");
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return 0;
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}
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*vp++ = tokval(tp);
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rand = 1;
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continue;
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/* unary */
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case DEFINED:
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case TILDE:
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case NOT:
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if (rand)
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goto syntax;
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*op++ = tp->type;
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continue;
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/* unary-binary */
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case PLUS: case MINUS: case STAR: case AND:
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if (rand==0) {
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if (tp->type==MINUS)
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*op++ = UMINUS;
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if (tp->type==STAR || tp->type==AND) {
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error(ERROR, "Illegal operator * or & in #if/#elif");
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return 0;
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}
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continue;
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}
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/* flow through */
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/* plain binary */
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case EQ: case NEQ: case LEQ: case GEQ: case LSH: case RSH:
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case LAND: case LOR: case SLASH: case PCT:
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case LT: case GT: case CIRC: case OR: case QUEST:
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case COLON: case COMMA:
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if (rand==0)
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goto syntax;
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if (evalop(priority[tp->type])!=0)
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return 0;
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*op++ = tp->type;
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rand = 0;
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continue;
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case LP:
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if (rand)
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goto syntax;
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*op++ = LP;
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continue;
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case RP:
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if (!rand)
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goto syntax;
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if (evalop(priority[RP])!=0)
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return 0;
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if (op<=ops || op[-1]!=LP) {
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goto syntax;
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}
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op--;
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continue;
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default:
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error(ERROR,"Bad operator (%t) in #if/#elif", tp);
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return 0;
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}
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}
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if (rand==0)
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goto syntax;
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if (evalop(priority[END])!=0)
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return 0;
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if (op!=&ops[1] || vp!=&vals[1]) {
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error(ERROR, "Botch in #if/#elif");
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return 0;
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}
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if (vals[0].type==UND)
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error(ERROR, "Undefined expression value");
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return vals[0].val;
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syntax:
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error(ERROR, "Syntax error in #if/#elif");
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return 0;
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}
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int
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evalop(struct pri pri)
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{
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struct value v1, v2;
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long rv1, rv2;
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int rtype, oper;
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rv2=0;
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rtype=0;
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while (pri.pri < priority[op[-1]].pri) {
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oper = *--op;
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if (priority[oper].arity==2) {
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v2 = *--vp;
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rv2 = v2.val;
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}
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v1 = *--vp;
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rv1 = v1.val;
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/*lint -e574 -e644 */
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switch (priority[oper].ctype) {
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case 0:
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default:
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error(WARNING, "Syntax error in #if/#endif");
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return 1;
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case ARITH:
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case RELAT:
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if (v1.type==UNS || v2.type==UNS)
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rtype = UNS;
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else
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rtype = SGN;
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if (v1.type==UND || v2.type==UND)
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rtype = UND;
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if (priority[oper].ctype==RELAT && rtype==UNS) {
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oper |= UNSMARK;
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rtype = SGN;
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}
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break;
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case SHIFT:
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if (v1.type==UND || v2.type==UND)
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rtype = UND;
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else
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rtype = v1.type;
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if (rtype==UNS)
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oper |= UNSMARK;
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break;
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case UNARY:
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rtype = v1.type;
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break;
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case LOGIC:
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case SPCL:
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break;
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}
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switch (oper) {
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case EQ: case EQ|UNSMARK:
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rv1 = rv1==rv2; break;
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case NEQ: case NEQ|UNSMARK:
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rv1 = rv1!=rv2; break;
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case LEQ:
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rv1 = rv1<=rv2; break;
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case GEQ:
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rv1 = rv1>=rv2; break;
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case LT:
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rv1 = rv1<rv2; break;
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case GT:
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rv1 = rv1>rv2; break;
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case LEQ|UNSMARK:
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rv1 = (unsigned long)rv1<=rv2; break;
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case GEQ|UNSMARK:
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rv1 = (unsigned long)rv1>=rv2; break;
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case LT|UNSMARK:
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rv1 = (unsigned long)rv1<rv2; break;
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case GT|UNSMARK:
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rv1 = (unsigned long)rv1>rv2; break;
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case LSH:
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rv1 <<= rv2; break;
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case LSH|UNSMARK:
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rv1 = (unsigned long)rv1<<rv2; break;
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case RSH:
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rv1 >>= rv2; break;
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case RSH|UNSMARK:
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rv1 = (unsigned long)rv1>>rv2; break;
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case LAND:
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rtype = UND;
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if (v1.type==UND)
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break;
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if (rv1!=0) {
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if (v2.type==UND)
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break;
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rv1 = rv2!=0;
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} else
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rv1 = 0;
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rtype = SGN;
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break;
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case LOR:
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rtype = UND;
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if (v1.type==UND)
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break;
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if (rv1==0) {
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if (v2.type==UND)
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break;
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rv1 = rv2!=0;
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} else
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rv1 = 1;
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rtype = SGN;
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break;
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case AND:
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rv1 &= rv2; break;
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case STAR:
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rv1 *= rv2; break;
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case PLUS:
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rv1 += rv2; break;
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case MINUS:
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rv1 -= rv2; break;
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case UMINUS:
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if (v1.type==UND)
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rtype = UND;
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rv1 = -rv1; break;
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case OR:
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rv1 |= rv2; break;
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case CIRC:
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rv1 ^= rv2; break;
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case TILDE:
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rv1 = ~rv1; break;
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case NOT:
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rv1 = !rv1; if (rtype!=UND) rtype = SGN; break;
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case SLASH:
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if (rv2==0) {
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rtype = UND;
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break;
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}
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if (rtype==UNS)
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rv1 /= (unsigned long)rv2;
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else
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rv1 /= rv2;
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break;
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case PCT:
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if (rv2==0) {
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rtype = UND;
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break;
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}
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if (rtype==UNS)
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rv1 %= (unsigned long)rv2;
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else
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rv1 %= rv2;
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break;
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case COLON:
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if (op[-1] != QUEST)
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error(ERROR, "Bad ?: in #if/endif");
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else {
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op--;
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if ((--vp)->val==0)
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v1 = v2;
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rtype = v1.type;
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rv1 = v1.val;
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}
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break;
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case DEFINED:
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break;
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default:
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error(ERROR, "Eval botch (unknown operator)");
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return 1;
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}
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/*lint +e574 +e644 */
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v1.val = rv1;
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v1.type = rtype;
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if (vp == &vals[NSTAK]) {
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error(ERROR, "Eval botch (stack overflow)");
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return 0;
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}
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*vp++ = v1;
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}
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return 0;
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}
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struct value
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tokval(Token *tp)
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{
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struct value v;
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Nlist *np;
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int i, base, c, longcc;
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unsigned long n;
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uchar *p;
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v.type = SGN;
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v.val = 0;
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switch (tp->type) {
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case NAME:
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v.val = 0;
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break;
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case NAME1:
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if ((np = lookup(tp, 0)) != NULL && np->flag&(ISDEFINED|ISMAC))
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v.val = 1;
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break;
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case NUMBER:
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n = 0;
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base = 10;
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p = tp->t;
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c = p[tp->len];
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p[tp->len] = '\0';
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if (*p=='0') {
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base = 8;
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if (p[1]=='x' || p[1]=='X') {
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base = 16;
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p++;
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}
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p++;
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}
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for (;; p++) {
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if ((i = digit(*p)) < 0)
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break;
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if (i>=base)
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error(WARNING,
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"Bad digit in number %t", tp);
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n *= base;
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n += i;
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}
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if (n>=0x80000000 && base!=10)
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v.type = UNS;
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for (; *p; p++) {
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if (*p=='u' || *p=='U')
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v.type = UNS;
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else if (*p=='l' || *p=='L')
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{}
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else {
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error(ERROR,
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"Bad number %t in #if/#elif", tp);
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break;
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}
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}
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v.val = n;
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tp->t[tp->len] = c;
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break;
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case CCON:
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n = 0;
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p = tp->t;
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longcc = 0;
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if (*p=='L') {
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p += 1;
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longcc = 1;
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}
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p += 1;
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if (*p=='\\') {
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p += 1;
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if ((i = digit(*p))>=0 && i<=7) {
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n = i;
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p += 1;
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if ((i = digit(*p))>=0 && i<=7) {
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p += 1;
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n <<= 3;
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n += i;
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if ((i = digit(*p))>=0 && i<=7) {
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p += 1;
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n <<= 3;
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n += i;
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}
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}
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} else if (*p=='x') {
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p += 1;
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while ((i = digit(*p))>=0 && i<=15) {
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p += 1;
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n <<= 4;
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n += i;
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}
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} else {
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static char cvcon[]
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= "a\ab\bf\fn\nr\rt\tv\v''\"\"??\\\\";
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for (i=0; i<sizeof(cvcon); i+=2) {
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if (*p == cvcon[i]) {
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n = cvcon[i+1];
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break;
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}
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}
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p += 1;
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if (i>=sizeof(cvcon))
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error(WARNING,
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"Undefined escape in character constant");
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}
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} else if (*p=='\'')
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error(ERROR, "Empty character constant");
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else
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n = *p++;
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if (*p!='\'')
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error(WARNING, "Multibyte character constant undefined");
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else if (n>127 && longcc==0)
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error(WARNING, "Character constant taken as not signed");
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v.val = n;
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break;
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case STRING:
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error(ERROR, "String in #if/#elif");
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break;
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}
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return v;
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}
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int
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digit(int i)
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{
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if ('0'<=i && i<='9')
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i -= '0';
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else if ('a'<=i && i<='f')
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i -= 'a'-10;
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else if ('A'<=i && i<='F')
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i -= 'A'-10;
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else
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i = -1;
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return i;
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}
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