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4 |
hellwig |
#include "c.h"
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static char rcsid[] = "$Id: decl.c,v 1.1 2002/08/28 23:12:42 drh Exp $";
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#define add(x,n) (x > inttype->u.sym->u.limits.max.i-(n) ? (overflow=1,x) : x+(n))
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#define chkoverflow(x,n) ((void)add(x,n))
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#define bits2bytes(n) (((n) + 7)/8)
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static int regcount;
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static List autos, registers;
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Symbol cfunc; /* current function */
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Symbol retv; /* return value location for structs */
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static void checkref(Symbol, void *);
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static Symbol dclglobal(int, char *, Type, Coordinate *);
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static Symbol dcllocal(int, char *, Type, Coordinate *);
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static Symbol dclparam(int, char *, Type, Coordinate *);
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static Type dclr(Type, char **, Symbol **, int);
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static Type dclr1(char **, Symbol **, int);
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static void decl(Symbol (*)(int, char *, Type, Coordinate *));
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extern void doconst(Symbol, void *);
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static void doglobal(Symbol, void *);
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static void doextern(Symbol, void *);
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static void exitparams(Symbol []);
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static void fields(Type);
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static void funcdefn(int, char *, Type, Symbol [], Coordinate);
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static void initglobal(Symbol, int);
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static void oldparam(Symbol, void *);
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static Symbol *parameters(Type);
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static Type specifier(int *);
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static Type structdcl(int);
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static Type tnode(int, Type);
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void program(void) {
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int n;
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level = GLOBAL;
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for (n = 0; t != EOI; n++)
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if (kind[t] == CHAR || kind[t] == STATIC
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|| t == ID || t == '*' || t == '(') {
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decl(dclglobal);
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deallocate(STMT);
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if (!(glevel >= 3 || xref))
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deallocate(FUNC);
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} else if (t == ';') {
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warning("empty declaration\n");
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t = gettok();
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} else {
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error("unrecognized declaration\n");
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t = gettok();
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}
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if (n == 0)
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warning("empty input file\n");
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}
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static Type specifier(int *sclass) {
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int cls, cons, sign, size, type, vol;
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Type ty = NULL;
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cls = vol = cons = sign = size = type = 0;
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if (sclass == NULL)
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cls = AUTO;
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for (;;) {
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int *p, tt = t;
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switch (t) {
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case AUTO:
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case REGISTER: if (level <= GLOBAL && cls == 0)
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error("invalid use of `%k'\n", t);
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p = &cls; t = gettok(); break;
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case STATIC: case EXTERN:
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case TYPEDEF: p = &cls; t = gettok(); break;
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case CONST: p = &cons; t = gettok(); break;
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case VOLATILE: p = &vol; t = gettok(); break;
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case SIGNED:
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case UNSIGNED: p = &sign; t = gettok(); break;
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case LONG: if (size == LONG) {
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size = 0;
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tt = LONG+LONG;
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}
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p = &size; t = gettok(); break;
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case SHORT: p = &size; t = gettok(); break;
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case VOID: case CHAR: case INT: case FLOAT:
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case DOUBLE: p = &type; ty = tsym->type;
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t = gettok(); break;
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case ENUM: p = &type; ty = enumdcl(); break;
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case STRUCT:
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case UNION: p = &type; ty = structdcl(t); break;
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case ID:
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if (istypename(t, tsym) && type == 0
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&& sign == 0 && size == 0) {
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use(tsym, src);
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| 90 |
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ty = tsym->type;
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if (isqual(ty)
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&& ty->size != ty->type->size) {
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ty = unqual(ty);
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if (isconst(tsym->type))
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ty = qual(CONST, ty);
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| 96 |
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if (isvolatile(tsym->type))
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ty = qual(VOLATILE, ty);
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tsym->type = ty;
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}
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p = &type;
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t = gettok();
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} else
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p = NULL;
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break;
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default: p = NULL;
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}
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if (p == NULL)
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break;
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| 109 |
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if (*p)
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error("invalid use of `%k'\n", tt);
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*p = tt;
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}
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| 113 |
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if (sclass)
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*sclass = cls;
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| 115 |
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if (type == 0) {
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type = INT;
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ty = inttype;
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}
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if (size == SHORT && type != INT
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|| size == LONG+LONG && type != INT
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|| size == LONG && type != INT && type != DOUBLE
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|| sign && type != INT && type != CHAR)
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error("invalid type specification\n");
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| 124 |
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if (type == CHAR && sign)
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| 125 |
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ty = sign == UNSIGNED ? unsignedchar : signedchar;
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else if (size == SHORT)
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ty = sign == UNSIGNED ? unsignedshort : shorttype;
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| 128 |
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else if (size == LONG && type == DOUBLE)
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| 129 |
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ty = longdouble;
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| 130 |
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else if (size == LONG+LONG) {
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ty = sign == UNSIGNED ? unsignedlonglong : longlong;
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| 132 |
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if (Aflag >= 1)
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warning("`%t' is a non-ANSI type\n", ty);
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| 134 |
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} else if (size == LONG)
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| 135 |
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ty = sign == UNSIGNED ? unsignedlong : longtype;
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| 136 |
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else if (sign == UNSIGNED && type == INT)
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| 137 |
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ty = unsignedtype;
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| 138 |
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if (cons == CONST)
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| 139 |
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ty = qual(CONST, ty);
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| 140 |
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if (vol == VOLATILE)
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| 141 |
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ty = qual(VOLATILE, ty);
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| 142 |
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return ty;
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| 143 |
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}
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| 144 |
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static void decl(Symbol (*dcl)(int, char *, Type, Coordinate *)) {
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| 145 |
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int sclass;
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| 146 |
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Type ty, ty1;
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| 147 |
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static char stop[] = { CHAR, STATIC, ID, 0 };
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| 148 |
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| 149 |
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ty = specifier(&sclass);
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| 150 |
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if (t == ID || t == '*' || t == '(' || t == '[') {
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| 151 |
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char *id;
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| 152 |
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Coordinate pos;
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id = NULL;
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pos = src;
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| 155 |
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if (level == GLOBAL) {
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| 156 |
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Symbol *params = NULL;
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| 157 |
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ty1 = dclr(ty, &id, ¶ms, 0);
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| 158 |
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if (params && id && isfunc(ty1)
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| 159 |
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&& (t == '{' || istypename(t, tsym)
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| 160 |
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|| (kind[t] == STATIC && t != TYPEDEF))) {
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| 161 |
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if (sclass == TYPEDEF) {
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| 162 |
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error("invalid use of `typedef'\n");
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| 163 |
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sclass = EXTERN;
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| 164 |
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}
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| 165 |
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if (ty1->u.f.oldstyle)
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| 166 |
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exitscope();
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| 167 |
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funcdefn(sclass, id, ty1, params, pos);
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| 168 |
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return;
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| 169 |
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} else if (params)
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| 170 |
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exitparams(params);
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| 171 |
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} else
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| 172 |
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ty1 = dclr(ty, &id, NULL, 0);
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| 173 |
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for (;;) {
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| 174 |
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if (Aflag >= 1 && !hasproto(ty1))
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| 175 |
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warning("missing prototype\n");
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| 176 |
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if (id == NULL)
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| 177 |
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error("missing identifier\n");
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| 178 |
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else if (sclass == TYPEDEF)
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| 179 |
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{
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| 180 |
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Symbol p = lookup(id, identifiers);
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| 181 |
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if (p && p->scope == level)
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| 182 |
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error("redeclaration of `%s'\n", id);
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| 183 |
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p = install(id, &identifiers, level,
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level < LOCAL ? PERM : FUNC);
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| 185 |
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p->type = ty1;
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| 186 |
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p->sclass = TYPEDEF;
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| 187 |
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p->src = pos;
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| 188 |
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}
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| 189 |
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else
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| 190 |
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(void)(*dcl)(sclass, id, ty1, &pos);
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| 191 |
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if (t != ',')
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| 192 |
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break;
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| 193 |
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t = gettok();
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| 194 |
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id = NULL;
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| 195 |
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pos = src;
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| 196 |
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ty1 = dclr(ty, &id, NULL, 0);
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| 197 |
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}
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| 198 |
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} else if (ty == NULL
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| 199 |
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|| !(isenum(ty) ||
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| 200 |
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isstruct(ty) && (*unqual(ty)->u.sym->name < '1' || *unqual(ty)->u.sym->name > '9')))
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| 201 |
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error("empty declaration\n");
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| 202 |
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test(';', stop);
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| 203 |
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}
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| 204 |
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static Symbol dclglobal(int sclass, char *id, Type ty, Coordinate *pos) {
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| 205 |
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Symbol p;
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| 206 |
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| 207 |
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if (sclass == 0)
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| 208 |
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sclass = AUTO;
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| 209 |
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else if (sclass != EXTERN && sclass != STATIC) {
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| 210 |
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error("invalid storage class `%k' for `%t %s'\n",
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| 211 |
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sclass, ty, id);
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| 212 |
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sclass = AUTO;
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| 213 |
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}
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| 214 |
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p = lookup(id, identifiers);
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| 215 |
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if (p && p->scope == GLOBAL) {
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| 216 |
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if (p->sclass != TYPEDEF && eqtype(ty, p->type, 1))
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| 217 |
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ty = compose(ty, p->type);
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| 218 |
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else
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| 219 |
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error("redeclaration of `%s' previously declared at %w\n", p->name, &p->src);
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| 220 |
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| 221 |
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if (!isfunc(ty) && p->defined && t == '=')
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| 222 |
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error("redefinition of `%s' previously defined at %w\n", p->name, &p->src);
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| 223 |
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| 224 |
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if (p->sclass == EXTERN && sclass == STATIC
|
| 225 |
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|| p->sclass == STATIC && sclass == AUTO
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| 226 |
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|| p->sclass == AUTO && sclass == STATIC)
|
| 227 |
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warning("inconsistent linkage for `%s' previously declared at %w\n", p->name, &p->src);
|
| 228 |
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| 229 |
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}
|
| 230 |
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if (p == NULL || p->scope != GLOBAL) {
|
| 231 |
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Symbol q = lookup(id, externals);
|
| 232 |
|
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if (q) {
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| 233 |
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if (sclass == STATIC || !eqtype(ty, q->type, 1))
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| 234 |
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warning("declaration of `%s' does not match previous declaration at %w\n", id, &q->src);
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| 235 |
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| 236 |
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p = relocate(id, externals, globals);
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| 237 |
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p->sclass = sclass;
|
| 238 |
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} else {
|
| 239 |
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p = install(id, &globals, GLOBAL, PERM);
|
| 240 |
|
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p->sclass = sclass;
|
| 241 |
|
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(*IR->defsymbol)(p);
|
| 242 |
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}
|
| 243 |
|
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if (p->sclass != STATIC) {
|
| 244 |
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static int nglobals;
|
| 245 |
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nglobals++;
|
| 246 |
|
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if (Aflag >= 2 && nglobals == 512)
|
| 247 |
|
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warning("more than 511 external identifiers\n");
|
| 248 |
|
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}
|
| 249 |
|
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} else if (p->sclass == EXTERN)
|
| 250 |
|
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p->sclass = sclass;
|
| 251 |
|
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p->type = ty;
|
| 252 |
|
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p->src = *pos;
|
| 253 |
|
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if (t == '=' && isfunc(p->type)) {
|
| 254 |
|
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error("illegal initialization for `%s'\n", p->name);
|
| 255 |
|
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t = gettok();
|
| 256 |
|
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initializer(p->type, 0);
|
| 257 |
|
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} else if (t == '=') {
|
| 258 |
|
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initglobal(p, 0);
|
| 259 |
|
|
if (glevel > 0 && IR->stabsym) {
|
| 260 |
|
|
(*IR->stabsym)(p); swtoseg(p->u.seg); }
|
| 261 |
|
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} else if (p->sclass == STATIC && !isfunc(p->type)
|
| 262 |
|
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&& p->type->size == 0)
|
| 263 |
|
|
error("undefined size for `%t %s'\n", p->type, p->name);
|
| 264 |
|
|
return p;
|
| 265 |
|
|
}
|
| 266 |
|
|
static void initglobal(Symbol p, int flag) {
|
| 267 |
|
|
Type ty;
|
| 268 |
|
|
|
| 269 |
|
|
if (t == '=' || flag) {
|
| 270 |
|
|
if (p->sclass == STATIC) {
|
| 271 |
|
|
for (ty = p->type; isarray(ty); ty = ty->type)
|
| 272 |
|
|
;
|
| 273 |
|
|
defglobal(p, isconst(ty) ? LIT : DATA);
|
| 274 |
|
|
} else
|
| 275 |
|
|
defglobal(p, DATA);
|
| 276 |
|
|
if (t == '=')
|
| 277 |
|
|
t = gettok();
|
| 278 |
|
|
ty = initializer(p->type, 0);
|
| 279 |
|
|
if (isarray(p->type) && p->type->size == 0)
|
| 280 |
|
|
p->type = ty;
|
| 281 |
|
|
if (p->sclass == EXTERN)
|
| 282 |
|
|
p->sclass = AUTO;
|
| 283 |
|
|
}
|
| 284 |
|
|
}
|
| 285 |
|
|
void defglobal(Symbol p, int seg) {
|
| 286 |
|
|
p->u.seg = seg;
|
| 287 |
|
|
swtoseg(p->u.seg);
|
| 288 |
|
|
if (p->sclass != STATIC)
|
| 289 |
|
|
(*IR->export)(p);
|
| 290 |
|
|
(*IR->global)(p);
|
| 291 |
|
|
p->defined = 1;
|
| 292 |
|
|
}
|
| 293 |
|
|
|
| 294 |
|
|
static Type dclr(Type basety, char **id, Symbol **params, int abstract) {
|
| 295 |
|
|
Type ty = dclr1(id, params, abstract);
|
| 296 |
|
|
|
| 297 |
|
|
for ( ; ty; ty = ty->type)
|
| 298 |
|
|
switch (ty->op) {
|
| 299 |
|
|
case POINTER:
|
| 300 |
|
|
basety = ptr(basety);
|
| 301 |
|
|
break;
|
| 302 |
|
|
case FUNCTION:
|
| 303 |
|
|
basety = func(basety, ty->u.f.proto,
|
| 304 |
|
|
ty->u.f.oldstyle);
|
| 305 |
|
|
break;
|
| 306 |
|
|
case ARRAY:
|
| 307 |
|
|
basety = array(basety, ty->size, 0);
|
| 308 |
|
|
break;
|
| 309 |
|
|
case CONST: case VOLATILE:
|
| 310 |
|
|
basety = qual(ty->op, basety);
|
| 311 |
|
|
break;
|
| 312 |
|
|
default: assert(0);
|
| 313 |
|
|
}
|
| 314 |
|
|
if (Aflag >= 2 && basety->size > 32767)
|
| 315 |
|
|
warning("more than 32767 bytes in `%t'\n", basety);
|
| 316 |
|
|
return basety;
|
| 317 |
|
|
}
|
| 318 |
|
|
static Type tnode(int op, Type type) {
|
| 319 |
|
|
Type ty;
|
| 320 |
|
|
|
| 321 |
|
|
NEW0(ty, STMT);
|
| 322 |
|
|
ty->op = op;
|
| 323 |
|
|
ty->type = type;
|
| 324 |
|
|
return ty;
|
| 325 |
|
|
}
|
| 326 |
|
|
static Type dclr1(char **id, Symbol **params, int abstract) {
|
| 327 |
|
|
Type ty = NULL;
|
| 328 |
|
|
|
| 329 |
|
|
switch (t) {
|
| 330 |
|
|
case ID: if (id)
|
| 331 |
|
|
*id = token;
|
| 332 |
|
|
else
|
| 333 |
|
|
error("extraneous identifier `%s'\n", token);
|
| 334 |
|
|
t = gettok(); break;
|
| 335 |
|
|
case '*': t = gettok(); if (t == CONST || t == VOLATILE) {
|
| 336 |
|
|
Type ty1;
|
| 337 |
|
|
ty1 = ty = tnode(t, NULL);
|
| 338 |
|
|
while ((t = gettok()) == CONST || t == VOLATILE)
|
| 339 |
|
|
ty1 = tnode(t, ty1);
|
| 340 |
|
|
ty->type = dclr1(id, params, abstract);
|
| 341 |
|
|
ty = ty1;
|
| 342 |
|
|
} else
|
| 343 |
|
|
ty = dclr1(id, params, abstract);
|
| 344 |
|
|
ty = tnode(POINTER, ty); break;
|
| 345 |
|
|
case '(': t = gettok(); if (abstract
|
| 346 |
|
|
&& (t == REGISTER || istypename(t, tsym) || t == ')')) {
|
| 347 |
|
|
Symbol *args;
|
| 348 |
|
|
ty = tnode(FUNCTION, ty);
|
| 349 |
|
|
enterscope();
|
| 350 |
|
|
if (level > PARAM)
|
| 351 |
|
|
enterscope();
|
| 352 |
|
|
args = parameters(ty);
|
| 353 |
|
|
exitparams(args);
|
| 354 |
|
|
} else {
|
| 355 |
|
|
ty = dclr1(id, params, abstract);
|
| 356 |
|
|
expect(')');
|
| 357 |
|
|
if (abstract && ty == NULL
|
| 358 |
|
|
&& (id == NULL || *id == NULL))
|
| 359 |
|
|
return tnode(FUNCTION, NULL);
|
| 360 |
|
|
} break;
|
| 361 |
|
|
case '[': break;
|
| 362 |
|
|
default: return ty;
|
| 363 |
|
|
}
|
| 364 |
|
|
while (t == '(' || t == '[')
|
| 365 |
|
|
switch (t) {
|
| 366 |
|
|
case '(': t = gettok(); { Symbol *args;
|
| 367 |
|
|
ty = tnode(FUNCTION, ty);
|
| 368 |
|
|
enterscope();
|
| 369 |
|
|
if (level > PARAM)
|
| 370 |
|
|
enterscope();
|
| 371 |
|
|
args = parameters(ty);
|
| 372 |
|
|
if (params && *params == NULL)
|
| 373 |
|
|
*params = args;
|
| 374 |
|
|
else
|
| 375 |
|
|
exitparams(args);
|
| 376 |
|
|
}
|
| 377 |
|
|
break;
|
| 378 |
|
|
case '[': t = gettok(); { int n = 0;
|
| 379 |
|
|
if (kind[t] == ID) {
|
| 380 |
|
|
n = intexpr(']', 1);
|
| 381 |
|
|
if (n <= 0) {
|
| 382 |
|
|
error("`%d' is an illegal array size\n", n);
|
| 383 |
|
|
n = 1;
|
| 384 |
|
|
}
|
| 385 |
|
|
} else
|
| 386 |
|
|
expect(']');
|
| 387 |
|
|
ty = tnode(ARRAY, ty);
|
| 388 |
|
|
ty->size = n; } break;
|
| 389 |
|
|
default: assert(0);
|
| 390 |
|
|
}
|
| 391 |
|
|
return ty;
|
| 392 |
|
|
}
|
| 393 |
|
|
static Symbol *parameters(Type fty) {
|
| 394 |
|
|
List list = NULL;
|
| 395 |
|
|
Symbol *params;
|
| 396 |
|
|
|
| 397 |
|
|
if (kind[t] == STATIC || istypename(t, tsym)) {
|
| 398 |
|
|
int n = 0;
|
| 399 |
|
|
Type ty1 = NULL;
|
| 400 |
|
|
for (;;) {
|
| 401 |
|
|
Type ty;
|
| 402 |
|
|
int sclass = 0;
|
| 403 |
|
|
char *id = NULL;
|
| 404 |
|
|
if (ty1 && t == ELLIPSIS) {
|
| 405 |
|
|
static struct symbol sentinel;
|
| 406 |
|
|
if (sentinel.type == NULL) {
|
| 407 |
|
|
sentinel.type = voidtype;
|
| 408 |
|
|
sentinel.defined = 1;
|
| 409 |
|
|
}
|
| 410 |
|
|
if (ty1 == voidtype)
|
| 411 |
|
|
error("illegal formal parameter types\n");
|
| 412 |
|
|
list = append(&sentinel, list);
|
| 413 |
|
|
t = gettok();
|
| 414 |
|
|
break;
|
| 415 |
|
|
}
|
| 416 |
|
|
if (!istypename(t, tsym) && t != REGISTER)
|
| 417 |
|
|
error("missing parameter type\n");
|
| 418 |
|
|
n++;
|
| 419 |
|
|
ty = dclr(specifier(&sclass), &id, NULL, 1);
|
| 420 |
|
|
if ( ty == voidtype && (ty1 || id)
|
| 421 |
|
|
|| ty1 == voidtype)
|
| 422 |
|
|
error("illegal formal parameter types\n");
|
| 423 |
|
|
if (id == NULL)
|
| 424 |
|
|
id = stringd(n);
|
| 425 |
|
|
if (ty != voidtype)
|
| 426 |
|
|
list = append(dclparam(sclass, id, ty, &src), list);
|
| 427 |
|
|
if (Aflag >= 1 && !hasproto(ty))
|
| 428 |
|
|
warning("missing prototype\n");
|
| 429 |
|
|
if (ty1 == NULL)
|
| 430 |
|
|
ty1 = ty;
|
| 431 |
|
|
if (t != ',')
|
| 432 |
|
|
break;
|
| 433 |
|
|
t = gettok();
|
| 434 |
|
|
}
|
| 435 |
|
|
fty->u.f.proto = newarray(length(list) + 1,
|
| 436 |
|
|
sizeof (Type *), PERM);
|
| 437 |
|
|
params = ltov(&list, FUNC);
|
| 438 |
|
|
for (n = 0; params[n]; n++)
|
| 439 |
|
|
fty->u.f.proto[n] = params[n]->type;
|
| 440 |
|
|
fty->u.f.proto[n] = NULL;
|
| 441 |
|
|
fty->u.f.oldstyle = 0;
|
| 442 |
|
|
} else {
|
| 443 |
|
|
if (t == ID)
|
| 444 |
|
|
for (;;) {
|
| 445 |
|
|
Symbol p;
|
| 446 |
|
|
if (t != ID) {
|
| 447 |
|
|
error("expecting an identifier\n");
|
| 448 |
|
|
break;
|
| 449 |
|
|
}
|
| 450 |
|
|
p = dclparam(0, token, inttype, &src);
|
| 451 |
|
|
p->defined = 0;
|
| 452 |
|
|
list = append(p, list);
|
| 453 |
|
|
t = gettok();
|
| 454 |
|
|
if (t != ',')
|
| 455 |
|
|
break;
|
| 456 |
|
|
t = gettok();
|
| 457 |
|
|
}
|
| 458 |
|
|
params = ltov(&list, FUNC);
|
| 459 |
|
|
fty->u.f.proto = NULL;
|
| 460 |
|
|
fty->u.f.oldstyle = 1;
|
| 461 |
|
|
}
|
| 462 |
|
|
if (t != ')') {
|
| 463 |
|
|
static char stop[] = { CHAR, STATIC, IF, ')', 0 };
|
| 464 |
|
|
expect(')');
|
| 465 |
|
|
skipto('{', stop);
|
| 466 |
|
|
}
|
| 467 |
|
|
if (t == ')')
|
| 468 |
|
|
t = gettok();
|
| 469 |
|
|
return params;
|
| 470 |
|
|
}
|
| 471 |
|
|
static void exitparams(Symbol params[]) {
|
| 472 |
|
|
assert(params);
|
| 473 |
|
|
if (params[0] && !params[0]->defined)
|
| 474 |
|
|
error("extraneous old-style parameter list\n");
|
| 475 |
|
|
if (level > PARAM)
|
| 476 |
|
|
exitscope();
|
| 477 |
|
|
exitscope();
|
| 478 |
|
|
}
|
| 479 |
|
|
|
| 480 |
|
|
static Symbol dclparam(int sclass, char *id, Type ty, Coordinate *pos) {
|
| 481 |
|
|
Symbol p;
|
| 482 |
|
|
|
| 483 |
|
|
if (isfunc(ty))
|
| 484 |
|
|
ty = ptr(ty);
|
| 485 |
|
|
else if (isarray(ty))
|
| 486 |
|
|
ty = atop(ty);
|
| 487 |
|
|
if (sclass == 0)
|
| 488 |
|
|
sclass = AUTO;
|
| 489 |
|
|
else if (sclass != REGISTER) {
|
| 490 |
|
|
error("invalid storage class `%k' for `%t%s\n",
|
| 491 |
|
|
sclass, ty, stringf(id ? " %s'" : "' parameter", id));
|
| 492 |
|
|
sclass = AUTO;
|
| 493 |
|
|
} else if (isvolatile(ty) || isstruct(ty)) {
|
| 494 |
|
|
warning("register declaration ignored for `%t%s\n",
|
| 495 |
|
|
ty, stringf(id ? " %s'" : "' parameter", id));
|
| 496 |
|
|
sclass = AUTO;
|
| 497 |
|
|
}
|
| 498 |
|
|
|
| 499 |
|
|
p = lookup(id, identifiers);
|
| 500 |
|
|
if (p && p->scope == level)
|
| 501 |
|
|
error("duplicate declaration for `%s' previously declared at %w\n", id, &p->src);
|
| 502 |
|
|
|
| 503 |
|
|
else
|
| 504 |
|
|
p = install(id, &identifiers, level, FUNC);
|
| 505 |
|
|
p->sclass = sclass;
|
| 506 |
|
|
p->src = *pos;
|
| 507 |
|
|
p->type = ty;
|
| 508 |
|
|
p->defined = 1;
|
| 509 |
|
|
if (t == '=') {
|
| 510 |
|
|
error("illegal initialization for parameter `%s'\n", id);
|
| 511 |
|
|
t = gettok();
|
| 512 |
|
|
(void)expr1(0);
|
| 513 |
|
|
}
|
| 514 |
|
|
return p;
|
| 515 |
|
|
}
|
| 516 |
|
|
static Type structdcl(int op) {
|
| 517 |
|
|
char *tag;
|
| 518 |
|
|
Type ty;
|
| 519 |
|
|
Symbol p;
|
| 520 |
|
|
Coordinate pos;
|
| 521 |
|
|
|
| 522 |
|
|
t = gettok();
|
| 523 |
|
|
pos = src;
|
| 524 |
|
|
if (t == ID) {
|
| 525 |
|
|
tag = token;
|
| 526 |
|
|
t = gettok();
|
| 527 |
|
|
} else
|
| 528 |
|
|
tag = "";
|
| 529 |
|
|
if (t == '{') {
|
| 530 |
|
|
static char stop[] = { IF, ',', 0 };
|
| 531 |
|
|
ty = newstruct(op, tag);
|
| 532 |
|
|
ty->u.sym->src = pos;
|
| 533 |
|
|
ty->u.sym->defined = 1;
|
| 534 |
|
|
t = gettok();
|
| 535 |
|
|
if (istypename(t, tsym))
|
| 536 |
|
|
fields(ty);
|
| 537 |
|
|
else
|
| 538 |
|
|
error("invalid %k field declarations\n", op);
|
| 539 |
|
|
test('}', stop);
|
| 540 |
|
|
}
|
| 541 |
|
|
else if (*tag && (p = lookup(tag, types)) != NULL
|
| 542 |
|
|
&& p->type->op == op) {
|
| 543 |
|
|
ty = p->type;
|
| 544 |
|
|
if (t == ';' && p->scope < level)
|
| 545 |
|
|
ty = newstruct(op, tag);
|
| 546 |
|
|
}
|
| 547 |
|
|
else {
|
| 548 |
|
|
if (*tag == 0)
|
| 549 |
|
|
error("missing %k tag\n", op);
|
| 550 |
|
|
ty = newstruct(op, tag);
|
| 551 |
|
|
}
|
| 552 |
|
|
if (*tag && xref)
|
| 553 |
|
|
use(ty->u.sym, pos);
|
| 554 |
|
|
return ty;
|
| 555 |
|
|
}
|
| 556 |
|
|
static void fields(Type ty) {
|
| 557 |
|
|
{ int n = 0;
|
| 558 |
|
|
while (istypename(t, tsym)) {
|
| 559 |
|
|
static char stop[] = { IF, CHAR, '}', 0 };
|
| 560 |
|
|
Type ty1 = specifier(NULL);
|
| 561 |
|
|
for (;;) {
|
| 562 |
|
|
Field p;
|
| 563 |
|
|
char *id = NULL;
|
| 564 |
|
|
Type fty = dclr(ty1, &id, NULL, 0);
|
| 565 |
|
|
p = newfield(id, ty, fty);
|
| 566 |
|
|
if (Aflag >= 1 && !hasproto(p->type))
|
| 567 |
|
|
warning("missing prototype\n");
|
| 568 |
|
|
if (t == ':') {
|
| 569 |
|
|
if (unqual(p->type) != inttype
|
| 570 |
|
|
&& unqual(p->type) != unsignedtype) {
|
| 571 |
|
|
error("`%t' is an illegal bit-field type\n",
|
| 572 |
|
|
p->type);
|
| 573 |
|
|
p->type = inttype;
|
| 574 |
|
|
}
|
| 575 |
|
|
t = gettok();
|
| 576 |
|
|
p->bitsize = intexpr(0, 0);
|
| 577 |
|
|
if (p->bitsize > 8*inttype->size || p->bitsize < 0) {
|
| 578 |
|
|
error("`%d' is an illegal bit-field size\n",
|
| 579 |
|
|
p->bitsize);
|
| 580 |
|
|
p->bitsize = 8*inttype->size;
|
| 581 |
|
|
} else if (p->bitsize == 0 && id) {
|
| 582 |
|
|
warning("extraneous 0-width bit field `%t %s' ignored\n", p->type, id);
|
| 583 |
|
|
|
| 584 |
|
|
p->name = stringd(genlabel(1));
|
| 585 |
|
|
}
|
| 586 |
|
|
p->lsb = 1;
|
| 587 |
|
|
}
|
| 588 |
|
|
else {
|
| 589 |
|
|
if (id == NULL)
|
| 590 |
|
|
error("field name missing\n");
|
| 591 |
|
|
else if (isfunc(p->type))
|
| 592 |
|
|
error("`%t' is an illegal field type\n", p->type);
|
| 593 |
|
|
else if (p->type->size == 0)
|
| 594 |
|
|
error("undefined size for field `%t %s'\n",
|
| 595 |
|
|
p->type, id);
|
| 596 |
|
|
}
|
| 597 |
|
|
if (isconst(p->type))
|
| 598 |
|
|
ty->u.sym->u.s.cfields = 1;
|
| 599 |
|
|
if (isvolatile(p->type))
|
| 600 |
|
|
ty->u.sym->u.s.vfields = 1;
|
| 601 |
|
|
n++;
|
| 602 |
|
|
if (Aflag >= 2 && n == 128)
|
| 603 |
|
|
warning("more than 127 fields in `%t'\n", ty);
|
| 604 |
|
|
if (t != ',')
|
| 605 |
|
|
break;
|
| 606 |
|
|
t = gettok();
|
| 607 |
|
|
}
|
| 608 |
|
|
test(';', stop);
|
| 609 |
|
|
} }
|
| 610 |
|
|
{ int bits = 0, off = 0, overflow = 0;
|
| 611 |
|
|
Field p, *q = &ty->u.sym->u.s.flist;
|
| 612 |
|
|
ty->align = IR->structmetric.align;
|
| 613 |
|
|
for (p = *q; p; p = p->link) {
|
| 614 |
|
|
int a = p->type->align ? p->type->align : 1;
|
| 615 |
|
|
if (p->lsb)
|
| 616 |
|
|
a = unsignedtype->align;
|
| 617 |
|
|
if (ty->op == UNION)
|
| 618 |
|
|
off = bits = 0;
|
| 619 |
|
|
else if (p->bitsize == 0 || bits == 0
|
| 620 |
|
|
|| bits - 1 + p->bitsize > 8*unsignedtype->size) {
|
| 621 |
|
|
off = add(off, bits2bytes(bits-1));
|
| 622 |
|
|
bits = 0;
|
| 623 |
|
|
chkoverflow(off, a - 1);
|
| 624 |
|
|
off = roundup(off, a);
|
| 625 |
|
|
}
|
| 626 |
|
|
if (a > ty->align)
|
| 627 |
|
|
ty->align = a;
|
| 628 |
|
|
p->offset = off;
|
| 629 |
|
|
|
| 630 |
|
|
if (p->lsb) {
|
| 631 |
|
|
if (bits == 0)
|
| 632 |
|
|
bits = 1;
|
| 633 |
|
|
if (IR->little_endian)
|
| 634 |
|
|
p->lsb = bits;
|
| 635 |
|
|
else
|
| 636 |
|
|
p->lsb = 8*unsignedtype->size - bits + 1
|
| 637 |
|
|
- p->bitsize + 1;
|
| 638 |
|
|
bits += p->bitsize;
|
| 639 |
|
|
} else
|
| 640 |
|
|
off = add(off, p->type->size);
|
| 641 |
|
|
if (off + bits2bytes(bits-1) > ty->size)
|
| 642 |
|
|
ty->size = off + bits2bytes(bits-1);
|
| 643 |
|
|
if (p->name == NULL
|
| 644 |
|
|
|| !('1' <= *p->name && *p->name <= '9')) {
|
| 645 |
|
|
*q = p;
|
| 646 |
|
|
q = &p->link;
|
| 647 |
|
|
}
|
| 648 |
|
|
}
|
| 649 |
|
|
*q = NULL;
|
| 650 |
|
|
chkoverflow(ty->size, ty->align - 1);
|
| 651 |
|
|
ty->size = roundup(ty->size, ty->align);
|
| 652 |
|
|
if (overflow) {
|
| 653 |
|
|
error("size of `%t' exceeds %d bytes\n", ty, inttype->u.sym->u.limits.max.i);
|
| 654 |
|
|
ty->size = inttype->u.sym->u.limits.max.i&(~(ty->align - 1));
|
| 655 |
|
|
} }
|
| 656 |
|
|
}
|
| 657 |
|
|
static void funcdefn(int sclass, char *id, Type ty, Symbol params[], Coordinate pt) {
|
| 658 |
|
|
int i, n;
|
| 659 |
|
|
Symbol *callee, *caller, p;
|
| 660 |
|
|
Type rty = freturn(ty);
|
| 661 |
|
|
|
| 662 |
|
|
if (isstruct(rty) && rty->size == 0)
|
| 663 |
|
|
error("illegal use of incomplete type `%t'\n", rty);
|
| 664 |
|
|
for (n = 0; params[n]; n++)
|
| 665 |
|
|
;
|
| 666 |
|
|
if (n > 0 && params[n-1]->name == NULL)
|
| 667 |
|
|
params[--n] = NULL;
|
| 668 |
|
|
if (Aflag >= 2 && n > 31)
|
| 669 |
|
|
warning("more than 31 parameters in function `%s'\n", id);
|
| 670 |
|
|
if (ty->u.f.oldstyle) {
|
| 671 |
|
|
if (Aflag >= 1)
|
| 672 |
|
|
warning("old-style function definition for `%s'\n", id);
|
| 673 |
|
|
caller = params;
|
| 674 |
|
|
callee = newarray(n + 1, sizeof *callee, FUNC);
|
| 675 |
|
|
memcpy(callee, caller, (n+1)*sizeof *callee);
|
| 676 |
|
|
enterscope();
|
| 677 |
|
|
assert(level == PARAM);
|
| 678 |
|
|
while (kind[t] == STATIC || istypename(t, tsym))
|
| 679 |
|
|
decl(dclparam);
|
| 680 |
|
|
foreach(identifiers, PARAM, oldparam, callee);
|
| 681 |
|
|
|
| 682 |
|
|
for (i = 0; (p = callee[i]) != NULL; i++) {
|
| 683 |
|
|
if (!p->defined)
|
| 684 |
|
|
callee[i] = dclparam(0, p->name, inttype, &p->src);
|
| 685 |
|
|
*caller[i] = *p;
|
| 686 |
|
|
caller[i]->sclass = AUTO;
|
| 687 |
|
|
caller[i]->type = promote(p->type);
|
| 688 |
|
|
}
|
| 689 |
|
|
p = lookup(id, identifiers);
|
| 690 |
|
|
if (p && p->scope == GLOBAL && isfunc(p->type)
|
| 691 |
|
|
&& p->type->u.f.proto) {
|
| 692 |
|
|
Type *proto = p->type->u.f.proto;
|
| 693 |
|
|
for (i = 0; caller[i] && proto[i]; i++) {
|
| 694 |
|
|
Type ty = unqual(proto[i]);
|
| 695 |
|
|
if (eqtype(isenum(ty) ? ty->type : ty,
|
| 696 |
|
|
unqual(caller[i]->type), 1) == 0)
|
| 697 |
|
|
break;
|
| 698 |
|
|
else if (isenum(ty) && !isenum(unqual(caller[i]->type)))
|
| 699 |
|
|
warning("compatibility of `%t' and `%t' is compiler dependent\n",
|
| 700 |
|
|
proto[i], caller[i]->type);
|
| 701 |
|
|
}
|
| 702 |
|
|
if (proto[i] || caller[i])
|
| 703 |
|
|
error("conflicting argument declarations for function `%s'\n", id);
|
| 704 |
|
|
|
| 705 |
|
|
}
|
| 706 |
|
|
else {
|
| 707 |
|
|
Type *proto = newarray(n + 1, sizeof *proto, PERM);
|
| 708 |
|
|
if (Aflag >= 1)
|
| 709 |
|
|
warning("missing prototype for `%s'\n", id);
|
| 710 |
|
|
for (i = 0; i < n; i++)
|
| 711 |
|
|
proto[i] = caller[i]->type;
|
| 712 |
|
|
proto[i] = NULL;
|
| 713 |
|
|
ty = func(rty, proto, 1);
|
| 714 |
|
|
}
|
| 715 |
|
|
} else {
|
| 716 |
|
|
callee = params;
|
| 717 |
|
|
caller = newarray(n + 1, sizeof *caller, FUNC);
|
| 718 |
|
|
for (i = 0; (p = callee[i]) != NULL && p->name; i++) {
|
| 719 |
|
|
NEW(caller[i], FUNC);
|
| 720 |
|
|
*caller[i] = *p;
|
| 721 |
|
|
if (isint(p->type))
|
| 722 |
|
|
caller[i]->type = promote(p->type);
|
| 723 |
|
|
caller[i]->sclass = AUTO;
|
| 724 |
|
|
if ('1' <= *p->name && *p->name <= '9')
|
| 725 |
|
|
error("missing name for parameter %d to function `%s'\n", i + 1, id);
|
| 726 |
|
|
|
| 727 |
|
|
}
|
| 728 |
|
|
caller[i] = NULL;
|
| 729 |
|
|
}
|
| 730 |
|
|
for (i = 0; (p = callee[i]) != NULL; i++)
|
| 731 |
|
|
if (p->type->size == 0) {
|
| 732 |
|
|
error("undefined size for parameter `%t %s'\n",
|
| 733 |
|
|
p->type, p->name);
|
| 734 |
|
|
caller[i]->type = p->type = inttype;
|
| 735 |
|
|
}
|
| 736 |
|
|
if (Aflag >= 2 && sclass != STATIC && strcmp(id, "main") == 0) {
|
| 737 |
|
|
if (ty->u.f.oldstyle)
|
| 738 |
|
|
warning("`%t %s()' is a non-ANSI definition\n", rty, id);
|
| 739 |
|
|
else if (!(rty == inttype
|
| 740 |
|
|
&& (n == 0 && callee[0] == NULL
|
| 741 |
|
|
|| n == 2 && callee[0]->type == inttype
|
| 742 |
|
|
&& isptr(callee[1]->type) && callee[1]->type->type == charptype
|
| 743 |
|
|
&& !variadic(ty))))
|
| 744 |
|
|
warning("`%s' is a non-ANSI definition\n", typestring(ty, id));
|
| 745 |
|
|
}
|
| 746 |
|
|
p = lookup(id, identifiers);
|
| 747 |
|
|
if (p && isfunc(p->type) && p->defined)
|
| 748 |
|
|
error("redefinition of `%s' previously defined at %w\n",
|
| 749 |
|
|
p->name, &p->src);
|
| 750 |
|
|
cfunc = dclglobal(sclass, id, ty, &pt);
|
| 751 |
|
|
cfunc->u.f.label = genlabel(1);
|
| 752 |
|
|
cfunc->u.f.callee = callee;
|
| 753 |
|
|
cfunc->u.f.pt = src;
|
| 754 |
|
|
cfunc->defined = 1;
|
| 755 |
|
|
if (xref)
|
| 756 |
|
|
use(cfunc, cfunc->src);
|
| 757 |
|
|
if (Pflag)
|
| 758 |
|
|
printproto(cfunc, cfunc->u.f.callee);
|
| 759 |
|
|
if (ncalled >= 0)
|
| 760 |
|
|
ncalled = findfunc(cfunc->name, pt.file);
|
| 761 |
|
|
labels = table(NULL, LABELS);
|
| 762 |
|
|
stmtlabs = table(NULL, LABELS);
|
| 763 |
|
|
refinc = 1.0;
|
| 764 |
|
|
regcount = 0;
|
| 765 |
|
|
codelist = &codehead;
|
| 766 |
|
|
codelist->next = NULL;
|
| 767 |
|
|
if (!IR->wants_callb && isstruct(rty))
|
| 768 |
|
|
retv = genident(AUTO, ptr(unqual(rty)), PARAM);
|
| 769 |
|
|
compound(0, NULL, 0);
|
| 770 |
|
|
|
| 771 |
|
|
definelab(cfunc->u.f.label);
|
| 772 |
|
|
if (events.exit)
|
| 773 |
|
|
apply(events.exit, cfunc, NULL);
|
| 774 |
|
|
walk(NULL, 0, 0);
|
| 775 |
|
|
exitscope();
|
| 776 |
|
|
assert(level == PARAM);
|
| 777 |
|
|
foreach(identifiers, level, checkref, NULL);
|
| 778 |
|
|
if (!IR->wants_callb && isstruct(rty)) {
|
| 779 |
|
|
Symbol *a;
|
| 780 |
|
|
a = newarray(n + 2, sizeof *a, FUNC);
|
| 781 |
|
|
a[0] = retv;
|
| 782 |
|
|
memcpy(&a[1], callee, (n+1)*sizeof *callee);
|
| 783 |
|
|
callee = a;
|
| 784 |
|
|
a = newarray(n + 2, sizeof *a, FUNC);
|
| 785 |
|
|
NEW(a[0], FUNC);
|
| 786 |
|
|
*a[0] = *retv;
|
| 787 |
|
|
memcpy(&a[1], caller, (n+1)*sizeof *callee);
|
| 788 |
|
|
caller = a;
|
| 789 |
|
|
}
|
| 790 |
|
|
if (!IR->wants_argb)
|
| 791 |
|
|
for (i = 0; caller[i]; i++)
|
| 792 |
|
|
if (isstruct(caller[i]->type)) {
|
| 793 |
|
|
caller[i]->type = ptr(caller[i]->type);
|
| 794 |
|
|
callee[i]->type = ptr(callee[i]->type);
|
| 795 |
|
|
caller[i]->structarg = callee[i]->structarg = 1;
|
| 796 |
|
|
}
|
| 797 |
|
|
if (glevel > 1) for (i = 0; callee[i]; i++) callee[i]->sclass = AUTO;
|
| 798 |
|
|
if (cfunc->sclass != STATIC)
|
| 799 |
|
|
(*IR->export)(cfunc);
|
| 800 |
|
|
if (glevel && IR->stabsym) {
|
| 801 |
|
|
swtoseg(CODE); (*IR->stabsym)(cfunc); }
|
| 802 |
|
|
swtoseg(CODE);
|
| 803 |
|
|
(*IR->function)(cfunc, caller, callee, cfunc->u.f.ncalls);
|
| 804 |
|
|
if (glevel && IR->stabfend)
|
| 805 |
|
|
(*IR->stabfend)(cfunc, lineno);
|
| 806 |
|
|
foreach(stmtlabs, LABELS, checklab, NULL);
|
| 807 |
|
|
exitscope();
|
| 808 |
|
|
expect('}');
|
| 809 |
|
|
labels = stmtlabs = NULL;
|
| 810 |
|
|
retv = NULL;
|
| 811 |
|
|
cfunc = NULL;
|
| 812 |
|
|
}
|
| 813 |
|
|
static void oldparam(Symbol p, void *cl) {
|
| 814 |
|
|
int i;
|
| 815 |
|
|
Symbol *callee = cl;
|
| 816 |
|
|
|
| 817 |
|
|
for (i = 0; callee[i]; i++)
|
| 818 |
|
|
if (p->name == callee[i]->name) {
|
| 819 |
|
|
callee[i] = p;
|
| 820 |
|
|
return;
|
| 821 |
|
|
}
|
| 822 |
|
|
error("declared parameter `%s' is missing\n", p->name);
|
| 823 |
|
|
}
|
| 824 |
|
|
void compound(int loop, struct swtch *swp, int lev) {
|
| 825 |
|
|
Code cp;
|
| 826 |
|
|
int nregs;
|
| 827 |
|
|
|
| 828 |
|
|
walk(NULL, 0, 0);
|
| 829 |
|
|
cp = code(Blockbeg);
|
| 830 |
|
|
enterscope();
|
| 831 |
|
|
assert(level >= LOCAL);
|
| 832 |
|
|
if (level == LOCAL && events.entry)
|
| 833 |
|
|
apply(events.entry, cfunc, NULL);
|
| 834 |
|
|
definept(NULL);
|
| 835 |
|
|
expect('{');
|
| 836 |
|
|
autos = registers = NULL;
|
| 837 |
|
|
if (level == LOCAL && IR->wants_callb
|
| 838 |
|
|
&& isstruct(freturn(cfunc->type))) {
|
| 839 |
|
|
retv = genident(AUTO, ptr(unqual(freturn(cfunc->type))), level);
|
| 840 |
|
|
retv->defined = 1;
|
| 841 |
|
|
retv->ref = 1;
|
| 842 |
|
|
registers = append(retv, registers);
|
| 843 |
|
|
}
|
| 844 |
|
|
while (kind[t] == CHAR || kind[t] == STATIC
|
| 845 |
|
|
|| istypename(t, tsym) && getchr() != ':')
|
| 846 |
|
|
decl(dcllocal);
|
| 847 |
|
|
{
|
| 848 |
|
|
int i;
|
| 849 |
|
|
Symbol *a = ltov(&autos, STMT);
|
| 850 |
|
|
nregs = length(registers);
|
| 851 |
|
|
for (i = 0; a[i]; i++)
|
| 852 |
|
|
registers = append(a[i], registers);
|
| 853 |
|
|
cp->u.block.locals = ltov(®isters, FUNC);
|
| 854 |
|
|
}
|
| 855 |
|
|
if (events.blockentry)
|
| 856 |
|
|
apply(events.blockentry, cp->u.block.locals, NULL);
|
| 857 |
|
|
while (kind[t] == IF || kind[t] == ID)
|
| 858 |
|
|
statement(loop, swp, lev);
|
| 859 |
|
|
walk(NULL, 0, 0);
|
| 860 |
|
|
foreach(identifiers, level, checkref, NULL);
|
| 861 |
|
|
{
|
| 862 |
|
|
int i = nregs, j;
|
| 863 |
|
|
Symbol p;
|
| 864 |
|
|
for ( ; (p = cp->u.block.locals[i]) != NULL; i++) {
|
| 865 |
|
|
for (j = i; j > nregs
|
| 866 |
|
|
&& cp->u.block.locals[j-1]->ref < p->ref; j--)
|
| 867 |
|
|
cp->u.block.locals[j] = cp->u.block.locals[j-1];
|
| 868 |
|
|
cp->u.block.locals[j] = p;
|
| 869 |
|
|
}
|
| 870 |
|
|
}
|
| 871 |
|
|
if (level == LOCAL) {
|
| 872 |
|
|
Code cp;
|
| 873 |
|
|
for (cp = codelist; cp->kind < Label; cp = cp->prev)
|
| 874 |
|
|
;
|
| 875 |
|
|
if (cp->kind != Jump) {
|
| 876 |
|
|
if (freturn(cfunc->type) != voidtype) {
|
| 877 |
|
|
warning("missing return value\n");
|
| 878 |
|
|
retcode(cnsttree(inttype, 0L));
|
| 879 |
|
|
} else
|
| 880 |
|
|
retcode(NULL);
|
| 881 |
|
|
}
|
| 882 |
|
|
}
|
| 883 |
|
|
if (events.blockexit)
|
| 884 |
|
|
apply(events.blockexit, cp->u.block.locals, NULL);
|
| 885 |
|
|
cp->u.block.level = level;
|
| 886 |
|
|
cp->u.block.identifiers = identifiers;
|
| 887 |
|
|
cp->u.block.types = types;
|
| 888 |
|
|
code(Blockend)->u.begin = cp;
|
| 889 |
|
|
if (reachable(Gen))
|
| 890 |
|
|
definept(NULL);
|
| 891 |
|
|
if (level > LOCAL) {
|
| 892 |
|
|
exitscope();
|
| 893 |
|
|
expect('}');
|
| 894 |
|
|
}
|
| 895 |
|
|
}
|
| 896 |
|
|
static void checkref(Symbol p, void *cl) {
|
| 897 |
|
|
if (p->scope >= PARAM
|
| 898 |
|
|
&& (isvolatile(p->type) || isfunc(p->type)))
|
| 899 |
|
|
p->addressed = 1;
|
| 900 |
|
|
if (Aflag >= 2 && p->defined && p->ref == 0) {
|
| 901 |
|
|
if (p->sclass == STATIC)
|
| 902 |
|
|
warning("static `%t %s' is not referenced\n",
|
| 903 |
|
|
p->type, p->name);
|
| 904 |
|
|
else if (p->scope == PARAM)
|
| 905 |
|
|
warning("parameter `%t %s' is not referenced\n",
|
| 906 |
|
|
p->type, p->name);
|
| 907 |
|
|
else if (p->scope >= LOCAL && p->sclass != EXTERN)
|
| 908 |
|
|
warning("local `%t %s' is not referenced\n",
|
| 909 |
|
|
p->type, p->name);
|
| 910 |
|
|
}
|
| 911 |
|
|
if (p->sclass == AUTO
|
| 912 |
|
|
&& (p->scope == PARAM && regcount == 0
|
| 913 |
|
|
|| p->scope >= LOCAL)
|
| 914 |
|
|
&& !p->addressed && isscalar(p->type) && p->ref >= 3.0)
|
| 915 |
|
|
p->sclass = REGISTER;
|
| 916 |
|
|
if (level == GLOBAL && p->sclass == STATIC && !p->defined
|
| 917 |
|
|
&& isfunc(p->type) && p->ref)
|
| 918 |
|
|
error("undefined static `%t %s'\n", p->type, p->name);
|
| 919 |
|
|
assert(!(level == GLOBAL && p->sclass == STATIC && !p->defined && !isfunc(p->type)));
|
| 920 |
|
|
}
|
| 921 |
|
|
static Symbol dcllocal(int sclass, char *id, Type ty, Coordinate *pos) {
|
| 922 |
|
|
Symbol p, q;
|
| 923 |
|
|
|
| 924 |
|
|
if (sclass == 0)
|
| 925 |
|
|
sclass = isfunc(ty) ? EXTERN : AUTO;
|
| 926 |
|
|
else if (isfunc(ty) && sclass != EXTERN) {
|
| 927 |
|
|
error("invalid storage class `%k' for `%t %s'\n",
|
| 928 |
|
|
sclass, ty, id);
|
| 929 |
|
|
sclass = EXTERN;
|
| 930 |
|
|
} else if (sclass == REGISTER
|
| 931 |
|
|
&& (isvolatile(ty) || isstruct(ty) || isarray(ty))) {
|
| 932 |
|
|
warning("register declaration ignored for `%t %s'\n",
|
| 933 |
|
|
ty, id);
|
| 934 |
|
|
sclass = AUTO;
|
| 935 |
|
|
}
|
| 936 |
|
|
q = lookup(id, identifiers);
|
| 937 |
|
|
if (q && q->scope >= level
|
| 938 |
|
|
|| q && q->scope == PARAM && level == LOCAL)
|
| 939 |
|
|
if (sclass == EXTERN && q->sclass == EXTERN
|
| 940 |
|
|
&& eqtype(q->type, ty, 1))
|
| 941 |
|
|
ty = compose(ty, q->type);
|
| 942 |
|
|
else
|
| 943 |
|
|
error("redeclaration of `%s' previously declared at %w\n", q->name, &q->src);
|
| 944 |
|
|
|
| 945 |
|
|
assert(level >= LOCAL);
|
| 946 |
|
|
p = install(id, &identifiers, level, sclass == STATIC || sclass == EXTERN ? PERM : FUNC);
|
| 947 |
|
|
p->type = ty;
|
| 948 |
|
|
p->sclass = sclass;
|
| 949 |
|
|
p->src = *pos;
|
| 950 |
|
|
switch (sclass) {
|
| 951 |
|
|
case EXTERN: q = lookup(id, globals);
|
| 952 |
|
|
if (q == NULL || q->sclass == TYPEDEF || q->sclass == ENUM) {
|
| 953 |
|
|
q = lookup(id, externals);
|
| 954 |
|
|
if (q == NULL) {
|
| 955 |
|
|
q = install(p->name, &externals, GLOBAL, PERM);
|
| 956 |
|
|
q->type = p->type;
|
| 957 |
|
|
q->sclass = EXTERN;
|
| 958 |
|
|
q->src = src;
|
| 959 |
|
|
(*IR->defsymbol)(q);
|
| 960 |
|
|
}
|
| 961 |
|
|
}
|
| 962 |
|
|
if (!eqtype(p->type, q->type, 1))
|
| 963 |
|
|
warning("declaration of `%s' does not match previous declaration at %w\n", q->name, &q->src);
|
| 964 |
|
|
|
| 965 |
|
|
p->u.alias = q; break;
|
| 966 |
|
|
case STATIC: (*IR->defsymbol)(p);
|
| 967 |
|
|
initglobal(p, 0);
|
| 968 |
|
|
if (!p->defined)
|
| 969 |
|
|
if (p->type->size > 0) {
|
| 970 |
|
|
defglobal(p, BSS);
|
| 971 |
|
|
(*IR->space)(p->type->size);
|
| 972 |
|
|
} else
|
| 973 |
|
|
error("undefined size for `%t %s'\n",
|
| 974 |
|
|
p->type, p->name);
|
| 975 |
|
|
p->defined = 1; break;
|
| 976 |
|
|
case REGISTER: registers = append(p, registers);
|
| 977 |
|
|
regcount++;
|
| 978 |
|
|
p->defined = 1;
|
| 979 |
|
|
break;
|
| 980 |
|
|
case AUTO: autos = append(p, autos);
|
| 981 |
|
|
p->defined = 1;
|
| 982 |
|
|
if (isarray(ty))
|
| 983 |
|
|
p->addressed = 1; break;
|
| 984 |
|
|
default: assert(0);
|
| 985 |
|
|
}
|
| 986 |
|
|
if (t == '=') {
|
| 987 |
|
|
Tree e;
|
| 988 |
|
|
if (sclass == EXTERN)
|
| 989 |
|
|
error("illegal initialization of `extern %s'\n", id);
|
| 990 |
|
|
t = gettok();
|
| 991 |
|
|
definept(NULL);
|
| 992 |
|
|
if (isscalar(p->type)
|
| 993 |
|
|
|| isstruct(p->type) && t != '{') {
|
| 994 |
|
|
if (t == '{') {
|
| 995 |
|
|
t = gettok();
|
| 996 |
|
|
e = expr1(0);
|
| 997 |
|
|
expect('}');
|
| 998 |
|
|
} else
|
| 999 |
|
|
e = expr1(0);
|
| 1000 |
|
|
} else {
|
| 1001 |
|
|
Symbol t1;
|
| 1002 |
|
|
Type ty = p->type, ty1 = ty;
|
| 1003 |
|
|
while (isarray(ty1))
|
| 1004 |
|
|
ty1 = ty1->type;
|
| 1005 |
|
|
if (!isconst(ty) && (!isarray(ty) || !isconst(ty1)))
|
| 1006 |
|
|
ty = qual(CONST, ty);
|
| 1007 |
|
|
t1 = genident(STATIC, ty, GLOBAL);
|
| 1008 |
|
|
initglobal(t1, 1);
|
| 1009 |
|
|
if (isarray(p->type) && p->type->size == 0
|
| 1010 |
|
|
&& t1->type->size > 0)
|
| 1011 |
|
|
p->type = array(p->type->type,
|
| 1012 |
|
|
t1->type->size/t1->type->type->size, 0);
|
| 1013 |
|
|
e = idtree(t1);
|
| 1014 |
|
|
}
|
| 1015 |
|
|
walk(root(asgn(p, e)), 0, 0);
|
| 1016 |
|
|
p->ref = 1;
|
| 1017 |
|
|
}
|
| 1018 |
|
|
if (!isfunc(p->type) && p->defined && p->type->size <= 0)
|
| 1019 |
|
|
error("undefined size for `%t %s'\n", p->type, id);
|
| 1020 |
|
|
return p;
|
| 1021 |
|
|
}
|
| 1022 |
|
|
void finalize(void) {
|
| 1023 |
|
|
foreach(externals, GLOBAL, doextern, NULL);
|
| 1024 |
|
|
foreach(identifiers, GLOBAL, doglobal, NULL);
|
| 1025 |
|
|
foreach(identifiers, GLOBAL, checkref, NULL);
|
| 1026 |
|
|
foreach(constants, CONSTANTS, doconst, NULL);
|
| 1027 |
|
|
}
|
| 1028 |
|
|
static void doextern(Symbol p, void *cl) {
|
| 1029 |
|
|
(*IR->import)(p);
|
| 1030 |
|
|
}
|
| 1031 |
|
|
static void doglobal(Symbol p, void *cl) {
|
| 1032 |
|
|
if (!p->defined && (p->sclass == EXTERN
|
| 1033 |
|
|
|| isfunc(p->type) && p->sclass == AUTO))
|
| 1034 |
|
|
(*IR->import)(p);
|
| 1035 |
|
|
else if (!p->defined && !isfunc(p->type)
|
| 1036 |
|
|
&& (p->sclass == AUTO || p->sclass == STATIC)) {
|
| 1037 |
|
|
if (isarray(p->type)
|
| 1038 |
|
|
&& p->type->size == 0 && p->type->type->size > 0)
|
| 1039 |
|
|
p->type = array(p->type->type, 1, 0);
|
| 1040 |
|
|
if (p->type->size > 0) {
|
| 1041 |
|
|
defglobal(p, BSS);
|
| 1042 |
|
|
(*IR->space)(p->type->size);
|
| 1043 |
|
|
if (glevel > 0 && IR->stabsym)
|
| 1044 |
|
|
(*IR->stabsym)(p);
|
| 1045 |
|
|
} else
|
| 1046 |
|
|
error("undefined size for `%t %s'\n",
|
| 1047 |
|
|
p->type, p->name);
|
| 1048 |
|
|
p->defined = 1;
|
| 1049 |
|
|
}
|
| 1050 |
|
|
if (Pflag
|
| 1051 |
|
|
&& !isfunc(p->type)
|
| 1052 |
|
|
&& !p->generated && p->sclass != EXTERN)
|
| 1053 |
|
|
printdecl(p, p->type);
|
| 1054 |
|
|
}
|
| 1055 |
|
|
void doconst(Symbol p, void *cl) {
|
| 1056 |
|
|
if (p->u.c.loc) {
|
| 1057 |
|
|
assert(p->u.c.loc->u.seg == 0);
|
| 1058 |
|
|
defglobal(p->u.c.loc, LIT);
|
| 1059 |
|
|
if (isarray(p->type) && p->type->type == widechar) {
|
| 1060 |
|
|
unsigned int *s = p->u.c.v.p;
|
| 1061 |
|
|
int n = p->type->size/widechar->size;
|
| 1062 |
|
|
while (n-- > 0) {
|
| 1063 |
|
|
Value v;
|
| 1064 |
|
|
v.u = *s++;
|
| 1065 |
|
|
(*IR->defconst)(widechar->op, widechar->size, v);
|
| 1066 |
|
|
}
|
| 1067 |
|
|
} else if (isarray(p->type))
|
| 1068 |
|
|
(*IR->defstring)(p->type->size, p->u.c.v.p);
|
| 1069 |
|
|
else
|
| 1070 |
|
|
(*IR->defconst)(p->type->op, p->type->size, p->u.c.v);
|
| 1071 |
|
|
p->u.c.loc = NULL;
|
| 1072 |
|
|
}
|
| 1073 |
|
|
}
|
| 1074 |
|
|
void checklab(Symbol p, void *cl) {
|
| 1075 |
|
|
if (!p->defined)
|
| 1076 |
|
|
error("undefined label `%s'\n", p->name);
|
| 1077 |
|
|
p->defined = 1;
|
| 1078 |
|
|
}
|
| 1079 |
|
|
|
| 1080 |
|
|
Type enumdcl(void) {
|
| 1081 |
|
|
char *tag;
|
| 1082 |
|
|
Type ty;
|
| 1083 |
|
|
Symbol p;
|
| 1084 |
|
|
Coordinate pos;
|
| 1085 |
|
|
|
| 1086 |
|
|
t = gettok();
|
| 1087 |
|
|
pos = src;
|
| 1088 |
|
|
if (t == ID) {
|
| 1089 |
|
|
tag = token;
|
| 1090 |
|
|
t = gettok();
|
| 1091 |
|
|
} else
|
| 1092 |
|
|
tag = "";
|
| 1093 |
|
|
if (t == '{') {
|
| 1094 |
|
|
static char follow[] = { IF, 0 };
|
| 1095 |
|
|
int n = 0;
|
| 1096 |
|
|
long k = -1;
|
| 1097 |
|
|
List idlist = 0;
|
| 1098 |
|
|
ty = newstruct(ENUM, tag);
|
| 1099 |
|
|
t = gettok();
|
| 1100 |
|
|
if (t != ID)
|
| 1101 |
|
|
error("expecting an enumerator identifier\n");
|
| 1102 |
|
|
while (t == ID) {
|
| 1103 |
|
|
char *id = token;
|
| 1104 |
|
|
Coordinate s;
|
| 1105 |
|
|
if (tsym && tsym->scope == level)
|
| 1106 |
|
|
error("redeclaration of `%s' previously declared at %w\n",
|
| 1107 |
|
|
token, &tsym->src);
|
| 1108 |
|
|
s = src;
|
| 1109 |
|
|
t = gettok();
|
| 1110 |
|
|
if (t == '=') {
|
| 1111 |
|
|
t = gettok();
|
| 1112 |
|
|
k = intexpr(0, 0);
|
| 1113 |
|
|
} else {
|
| 1114 |
|
|
if (k == inttype->u.sym->u.limits.max.i)
|
| 1115 |
|
|
error("overflow in value for enumeration constant `%s'\n", id);
|
| 1116 |
|
|
k++;
|
| 1117 |
|
|
}
|
| 1118 |
|
|
p = install(id, &identifiers, level, level < LOCAL ? PERM : FUNC);
|
| 1119 |
|
|
p->src = s;
|
| 1120 |
|
|
p->type = ty;
|
| 1121 |
|
|
p->sclass = ENUM;
|
| 1122 |
|
|
p->u.value = k;
|
| 1123 |
|
|
idlist = append(p, idlist);
|
| 1124 |
|
|
n++;
|
| 1125 |
|
|
if (Aflag >= 2 && n == 128)
|
| 1126 |
|
|
warning("more than 127 enumeration constants in `%t'\n", ty);
|
| 1127 |
|
|
if (t != ',')
|
| 1128 |
|
|
break;
|
| 1129 |
|
|
t = gettok();
|
| 1130 |
|
|
if (Aflag >= 2 && t == '}')
|
| 1131 |
|
|
warning("non-ANSI trailing comma in enumerator list\n");
|
| 1132 |
|
|
}
|
| 1133 |
|
|
test('}', follow);
|
| 1134 |
|
|
ty->type = inttype;
|
| 1135 |
|
|
ty->size = ty->type->size;
|
| 1136 |
|
|
ty->align = ty->type->align;
|
| 1137 |
|
|
ty->u.sym->u.idlist = ltov(&idlist, PERM);
|
| 1138 |
|
|
ty->u.sym->defined = 1;
|
| 1139 |
|
|
} else if ((p = lookup(tag, types)) != NULL && p->type->op == ENUM) {
|
| 1140 |
|
|
ty = p->type;
|
| 1141 |
|
|
if (t == ';')
|
| 1142 |
|
|
error("empty declaration\n");
|
| 1143 |
|
|
} else {
|
| 1144 |
|
|
error("unknown enumeration `%s'\n", tag);
|
| 1145 |
|
|
ty = newstruct(ENUM, tag);
|
| 1146 |
|
|
ty->type = inttype;
|
| 1147 |
|
|
}
|
| 1148 |
|
|
if (*tag && xref)
|
| 1149 |
|
|
use(p, pos);
|
| 1150 |
|
|
return ty;
|
| 1151 |
|
|
}
|
| 1152 |
|
|
|
| 1153 |
|
|
Type typename(void) {
|
| 1154 |
|
|
Type ty = specifier(NULL);
|
| 1155 |
|
|
|
| 1156 |
|
|
if (t == '*' || t == '(' || t == '[') {
|
| 1157 |
|
|
ty = dclr(ty, NULL, NULL, 1);
|
| 1158 |
|
|
if (Aflag >= 1 && !hasproto(ty))
|
| 1159 |
|
|
warning("missing prototype\n");
|
| 1160 |
|
|
}
|
| 1161 |
|
|
return ty;
|
| 1162 |
|
|
}
|
| 1163 |
|
|
|
