diff options
Diffstat (limited to 'ioq3-r437/src/tools/lcc/cpp/eval.c')
| -rw-r--r-- | ioq3-r437/src/tools/lcc/cpp/eval.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/ioq3-r437/src/tools/lcc/cpp/eval.c b/ioq3-r437/src/tools/lcc/cpp/eval.c new file mode 100644 index 00000000..7061effd --- /dev/null +++ b/ioq3-r437/src/tools/lcc/cpp/eval.c @@ -0,0 +1,520 @@ +#include <stdlib.h> +#include <string.h> +#include "cpp.h" + +#define NSTAK 32 +#define SGN 0 +#define UNS 1 +#define UND 2 + +#define UNSMARK 0x1000 + +struct value { + long val; + int type; +}; + +/* conversion types */ +#define RELAT 1 +#define ARITH 2 +#define LOGIC 3 +#define SPCL 4 +#define SHIFT 5 +#define UNARY 6 + +/* operator priority, arity, and conversion type, indexed by tokentype */ +struct pri { + char pri; + char arity; + char ctype; +} priority[] = { + { 0, 0, 0 }, /* END */ + { 0, 0, 0 }, /* UNCLASS */ + { 0, 0, 0 }, /* NAME */ + { 0, 0, 0 }, /* NUMBER */ + { 0, 0, 0 }, /* STRING */ + { 0, 0, 0 }, /* CCON */ + { 0, 0, 0 }, /* NL */ + { 0, 0, 0 }, /* WS */ + { 0, 0, 0 }, /* DSHARP */ + { 11, 2, RELAT }, /* EQ */ + { 11, 2, RELAT }, /* NEQ */ + { 12, 2, RELAT }, /* LEQ */ + { 12, 2, RELAT }, /* GEQ */ + { 13, 2, SHIFT }, /* LSH */ + { 13, 2, SHIFT }, /* RSH */ + { 7, 2, LOGIC }, /* LAND */ + { 6, 2, LOGIC }, /* LOR */ + { 0, 0, 0 }, /* PPLUS */ + { 0, 0, 0 }, /* MMINUS */ + { 0, 0, 0 }, /* ARROW */ + { 0, 0, 0 }, /* SBRA */ + { 0, 0, 0 }, /* SKET */ + { 3, 0, 0 }, /* LP */ + { 3, 0, 0 }, /* RP */ + { 0, 0, 0 }, /* DOT */ + { 10, 2, ARITH }, /* AND */ + { 15, 2, ARITH }, /* STAR */ + { 14, 2, ARITH }, /* PLUS */ + { 14, 2, ARITH }, /* MINUS */ + { 16, 1, UNARY }, /* TILDE */ + { 16, 1, UNARY }, /* NOT */ + { 15, 2, ARITH }, /* SLASH */ + { 15, 2, ARITH }, /* PCT */ + { 12, 2, RELAT }, /* LT */ + { 12, 2, RELAT }, /* GT */ + { 9, 2, ARITH }, /* CIRC */ + { 8, 2, ARITH }, /* OR */ + { 5, 2, SPCL }, /* QUEST */ + { 5, 2, SPCL }, /* COLON */ + { 0, 0, 0 }, /* ASGN */ + { 4, 2, 0 }, /* COMMA */ + { 0, 0, 0 }, /* SHARP */ + { 0, 0, 0 }, /* SEMIC */ + { 0, 0, 0 }, /* CBRA */ + { 0, 0, 0 }, /* CKET */ + { 0, 0, 0 }, /* ASPLUS */ + { 0, 0, 0 }, /* ASMINUS */ + { 0, 0, 0 }, /* ASSTAR */ + { 0, 0, 0 }, /* ASSLASH */ + { 0, 0, 0 }, /* ASPCT */ + { 0, 0, 0 }, /* ASCIRC */ + { 0, 0, 0 }, /* ASLSH */ + { 0, 0, 0 }, /* ASRSH */ + { 0, 0, 0 }, /* ASOR */ + { 0, 0, 0 }, /* ASAND */ + { 0, 0, 0 }, /* ELLIPS */ + { 0, 0, 0 }, /* DSHARP1 */ + { 0, 0, 0 }, /* NAME1 */ + { 16, 1, UNARY }, /* DEFINED */ + { 16, 0, UNARY }, /* UMINUS */ +}; + +int evalop(struct pri); +struct value tokval(Token *); +struct value vals[NSTAK], *vp; +enum toktype ops[NSTAK], *op; + +/* + * Evaluate an #if #elif #ifdef #ifndef line. trp->tp points to the keyword. + */ +long +eval(Tokenrow *trp, int kw) +{ + Token *tp; + Nlist *np; + int ntok, rand; + + trp->tp++; + if (kw==KIFDEF || kw==KIFNDEF) { + if (trp->lp - trp->bp != 4 || trp->tp->type!=NAME) { + error(ERROR, "Syntax error in #ifdef/#ifndef"); + return 0; + } + np = lookup(trp->tp, 0); + return (kw==KIFDEF) == (np && np->flag&(ISDEFINED|ISMAC)); + } + ntok = trp->tp - trp->bp; + kwdefined->val = KDEFINED; /* activate special meaning of defined */ + expandrow(trp, "<if>"); + kwdefined->val = NAME; + vp = vals; + op = ops; + *op++ = END; + for (rand=0, tp = trp->bp+ntok; tp < trp->lp; tp++) { + switch(tp->type) { + case WS: + case NL: + continue; + + /* nilary */ + case NAME: + case NAME1: + case NUMBER: + case CCON: + case STRING: + if (rand) + goto syntax; + *vp++ = tokval(tp); + rand = 1; + continue; + + /* unary */ + case DEFINED: + case TILDE: + case NOT: + if (rand) + goto syntax; + *op++ = tp->type; + continue; + + /* unary-binary */ + case PLUS: case MINUS: case STAR: case AND: + if (rand==0) { + if (tp->type==MINUS) + *op++ = UMINUS; + if (tp->type==STAR || tp->type==AND) { + error(ERROR, "Illegal operator * or & in #if/#elsif"); + return 0; + } + continue; + } + /* flow through */ + + /* plain binary */ + case EQ: case NEQ: case LEQ: case GEQ: case LSH: case RSH: + case LAND: case LOR: case SLASH: case PCT: + case LT: case GT: case CIRC: case OR: case QUEST: + case COLON: case COMMA: + if (rand==0) + goto syntax; + if (evalop(priority[tp->type])!=0) + return 0; + *op++ = tp->type; + rand = 0; + continue; + + case LP: + if (rand) + goto syntax; + *op++ = LP; + continue; + + case RP: + if (!rand) + goto syntax; + if (evalop(priority[RP])!=0) + return 0; + if (op<=ops || op[-1]!=LP) { + goto syntax; + } + op--; + continue; + + default: + error(ERROR,"Bad operator (%t) in #if/#elsif", tp); + return 0; + } + } + if (rand==0) + goto syntax; + if (evalop(priority[END])!=0) + return 0; + if (op!=&ops[1] || vp!=&vals[1]) { + error(ERROR, "Botch in #if/#elsif"); + return 0; + } + if (vals[0].type==UND) + error(ERROR, "Undefined expression value"); + return vals[0].val; +syntax: + error(ERROR, "Syntax error in #if/#elsif"); + return 0; +} + +int +evalop(struct pri pri) +{ + struct value v1, v2; + long rv1, rv2; + int rtype, oper; + + rv2=0; + rtype=0; + while (pri.pri < priority[op[-1]].pri) { + oper = *--op; + if (priority[oper].arity==2) { + v2 = *--vp; + rv2 = v2.val; + } + v1 = *--vp; + rv1 = v1.val; +/*lint -e574 -e644 */ + switch (priority[oper].ctype) { + case 0: + default: + error(WARNING, "Syntax error in #if/#endif"); + return 1; + case ARITH: + case RELAT: + if (v1.type==UNS || v2.type==UNS) + rtype = UNS; + else + rtype = SGN; + if (v1.type==UND || v2.type==UND) + rtype = UND; + if (priority[oper].ctype==RELAT && rtype==UNS) { + oper |= UNSMARK; + rtype = SGN; + } + break; + case SHIFT: + if (v1.type==UND || v2.type==UND) + rtype = UND; + else + rtype = v1.type; + if (rtype==UNS) + oper |= UNSMARK; + break; + case UNARY: + rtype = v1.type; + break; + case LOGIC: + case SPCL: + break; + } + switch (oper) { + case EQ: case EQ|UNSMARK: + rv1 = rv1==rv2; break; + case NEQ: case NEQ|UNSMARK: + rv1 = rv1!=rv2; break; + case LEQ: + rv1 = rv1<=rv2; break; + case GEQ: + rv1 = rv1>=rv2; break; + case LT: + rv1 = rv1<rv2; break; + case GT: + rv1 = rv1>rv2; break; + case LEQ|UNSMARK: + rv1 = (unsigned long)rv1<=rv2; break; + case GEQ|UNSMARK: + rv1 = (unsigned long)rv1>=rv2; break; + case LT|UNSMARK: + rv1 = (unsigned long)rv1<rv2; break; + case GT|UNSMARK: + rv1 = (unsigned long)rv1>rv2; break; + case LSH: + rv1 <<= rv2; break; + case LSH|UNSMARK: + rv1 = (unsigned long)rv1<<rv2; break; + case RSH: + rv1 >>= rv2; break; + case RSH|UNSMARK: + rv1 = (unsigned long)rv1>>rv2; break; + case LAND: + rtype = UND; + if (v1.type==UND) + break; + if (rv1!=0) { + if (v2.type==UND) + break; + rv1 = rv2!=0; + } else + rv1 = 0; + rtype = SGN; + break; + case LOR: + rtype = UND; + if (v1.type==UND) + break; + if (rv1==0) { + if (v2.type==UND) + break; + rv1 = rv2!=0; + } else + rv1 = 1; + rtype = SGN; + break; + case AND: + rv1 &= rv2; break; + case STAR: + rv1 *= rv2; break; + case PLUS: + rv1 += rv2; break; + case MINUS: + rv1 -= rv2; break; + case UMINUS: + if (v1.type==UND) + rtype = UND; + rv1 = -rv1; break; + case OR: + rv1 |= rv2; break; + case CIRC: + rv1 ^= rv2; break; + case TILDE: + rv1 = ~rv1; break; + case NOT: + rv1 = !rv1; if (rtype!=UND) rtype = SGN; break; + case SLASH: + if (rv2==0) { + rtype = UND; + break; + } + if (rtype==UNS) + rv1 /= (unsigned long)rv2; + else + rv1 /= rv2; + break; + case PCT: + if (rv2==0) { + rtype = UND; + break; + } + if (rtype==UNS) + rv1 %= (unsigned long)rv2; + else + rv1 %= rv2; + break; + case COLON: + if (op[-1] != QUEST) + error(ERROR, "Bad ?: in #if/endif"); + else { + op--; + if ((--vp)->val==0) + v1 = v2; + rtype = v1.type; + rv1 = v1.val; + } + break; + case DEFINED: + break; + default: + error(ERROR, "Eval botch (unknown operator)"); + return 1; + } +/*lint +e574 +e644 */ + v1.val = rv1; + v1.type = rtype; + *vp++ = v1; + } + return 0; +} + +struct value +tokval(Token *tp) +{ + struct value v; + Nlist *np; + int i, base, c; + unsigned long n; + uchar *p; + + v.type = SGN; + v.val = 0; + switch (tp->type) { + + case NAME: + v.val = 0; + break; + + case NAME1: + if ((np = lookup(tp, 0)) != NULL && np->flag&(ISDEFINED|ISMAC)) + v.val = 1; + break; + + case NUMBER: + n = 0; + base = 10; + p = tp->t; + c = p[tp->len]; + p[tp->len] = '\0'; + if (*p=='0') { + base = 8; + if (p[1]=='x' || p[1]=='X') { + base = 16; + p++; + } + p++; + } + for (;; p++) { + if ((i = digit(*p)) < 0) + break; + if (i>=base) + error(WARNING, + "Bad digit in number %t", tp); + n *= base; + n += i; + } + if (n>=0x80000000 && base!=10) + v.type = UNS; + for (; *p; p++) { + if (*p=='u' || *p=='U') + v.type = UNS; + else if (*p=='l' || *p=='L') + ; + else { + error(ERROR, + "Bad number %t in #if/#elsif", tp); + break; + } + } + v.val = n; + tp->t[tp->len] = c; + break; + + case CCON: + n = 0; + p = tp->t; + if (*p=='L') { + p += 1; + error(WARNING, "Wide char constant value undefined"); + } + p += 1; + if (*p=='\\') { + p += 1; + if ((i = digit(*p))>=0 && i<=7) { + n = i; + p += 1; + if ((i = digit(*p))>=0 && i<=7) { + p += 1; + n <<= 3; + n += i; + if ((i = digit(*p))>=0 && i<=7) { + p += 1; + n <<= 3; + n += i; + } + } + } else if (*p=='x') { + p += 1; + while ((i = digit(*p))>=0 && i<=15) { + p += 1; + n <<= 4; + n += i; + } + } else { + static char cvcon[] + = "b\bf\fn\nr\rt\tv\v''\"\"??\\\\"; + for (i=0; i<sizeof(cvcon); i+=2) { + if (*p == cvcon[i]) { + n = cvcon[i+1]; + break; + } + } + p += 1; + if (i>=sizeof(cvcon)) + error(WARNING, + "Undefined escape in character constant"); + } + } else if (*p=='\'') + error(ERROR, "Empty character constant"); + else + n = *p++; + if (*p!='\'') + error(WARNING, "Multibyte character constant undefined"); + else if (n>127) + error(WARNING, "Character constant taken as not signed"); + v.val = n; + break; + + case STRING: + error(ERROR, "String in #if/#elsif"); + break; + } + return v; +} + +int +digit(int i) +{ + if ('0'<=i && i<='9') + i -= '0'; + else if ('a'<=i && i<='f') + i -= 'a'-10; + else if ('A'<=i && i<='F') + i -= 'A'-10; + else + i = -1; + return i; +} |