diff options
Diffstat (limited to 'lcc/src/decl.c')
| -rwxr-xr-x | lcc/src/decl.c | 1160 |
1 files changed, 1160 insertions, 0 deletions
diff --git a/lcc/src/decl.c b/lcc/src/decl.c new file mode 100755 index 0000000..59e0850 --- /dev/null +++ b/lcc/src/decl.c @@ -0,0 +1,1160 @@ +#include "c.h"
+
+
+#define add(x,n) (x > inttype->u.sym->u.limits.max.i-(n) ? (overflow=1,x) : x+(n))
+#define chkoverflow(x,n) ((void)add(x,n))
+#define bits2bytes(n) (((n) + 7)/8)
+static int regcount;
+
+static List autos, registers;
+Symbol cfunc; /* current function */
+Symbol retv; /* return value location for structs */
+
+static void checkref(Symbol, void *);
+static Symbol dclglobal(int, char *, Type, Coordinate *);
+static Symbol dcllocal(int, char *, Type, Coordinate *);
+static Symbol dclparam(int, char *, Type, Coordinate *);
+static Type dclr(Type, char **, Symbol **, int);
+static Type dclr1(char **, Symbol **, int);
+static void decl(Symbol (*)(int, char *, Type, Coordinate *));
+extern void doconst(Symbol, void *);
+static void doglobal(Symbol, void *);
+static void doextern(Symbol, void *);
+static void exitparams(Symbol []);
+static void fields(Type);
+static void funcdefn(int, char *, Type, Symbol [], Coordinate);
+static void initglobal(Symbol, int);
+static void oldparam(Symbol, void *);
+static Symbol *parameters(Type);
+static Type specifier(int *);
+static Type structdcl(int);
+static Type tnode(int, Type);
+void program(void) {
+ int n;
+
+ level = GLOBAL;
+ for (n = 0; t != EOI; n++)
+ if (kind[t] == CHAR || kind[t] == STATIC
+ || t == ID || t == '*' || t == '(') {
+ decl(dclglobal);
+ deallocate(STMT);
+ if (!(glevel >= 3 || xref))
+ deallocate(FUNC);
+ } else if (t == ';') {
+ warning("empty declaration\n");
+ t = gettok();
+ } else {
+ error("unrecognized declaration\n");
+ t = gettok();
+ }
+ if (n == 0)
+ warning("empty input file\n");
+}
+static Type specifier(int *sclass) {
+ int cls, cons, sign, size, type, vol;
+ Type ty = NULL;
+
+ cls = vol = cons = sign = size = type = 0;
+ if (sclass == NULL)
+ cls = AUTO;
+ for (;;) {
+ int *p, tt = t;
+ switch (t) {
+ case AUTO:
+ case REGISTER: if (level <= GLOBAL && cls == 0)
+ error("invalid use of `%k'\n", t);
+ p = &cls; t = gettok(); break;
+ case STATIC: case EXTERN:
+ case TYPEDEF: p = &cls; t = gettok(); break;
+ case CONST: p = &cons; t = gettok(); break;
+ case VOLATILE: p = &vol; t = gettok(); break;
+ case SIGNED:
+ case UNSIGNED: p = &sign; t = gettok(); break;
+ case LONG: if (size == LONG) {
+ size = 0;
+ tt = LONG+LONG;
+ }
+ p = &size; t = gettok(); break;
+ case SHORT: p = &size; t = gettok(); break;
+ case VOID: case CHAR: case INT: case FLOAT:
+ case DOUBLE: p = &type; ty = tsym->type;
+ t = gettok(); break;
+ case ENUM: p = &type; ty = enumdcl(); break;
+ case STRUCT:
+ case UNION: p = &type; ty = structdcl(t); break;
+ case ID:
+ if (istypename(t, tsym) && type == 0
+ && sign == 0 && size == 0) {
+ use(tsym, src);
+ ty = tsym->type;
+ if (isqual(ty)
+ && ty->size != ty->type->size) {
+ ty = unqual(ty);
+ if (isconst(tsym->type))
+ ty = qual(CONST, ty);
+ if (isvolatile(tsym->type))
+ ty = qual(VOLATILE, ty);
+ tsym->type = ty;
+ }
+ p = &type;
+ t = gettok();
+ } else
+ p = NULL;
+ break;
+ default: p = NULL;
+ }
+ if (p == NULL)
+ break;
+ if (*p)
+ error("invalid use of `%k'\n", tt);
+ *p = tt;
+ }
+ if (sclass)
+ *sclass = cls;
+ if (type == 0) {
+ type = INT;
+ ty = inttype;
+ }
+ if (size == SHORT && type != INT
+ || size == LONG+LONG && type != INT
+ || size == LONG && type != INT && type != DOUBLE
+ || sign && type != INT && type != CHAR)
+ error("invalid type specification\n");
+ if (type == CHAR && sign)
+ ty = sign == UNSIGNED ? unsignedchar : signedchar;
+ else if (size == SHORT)
+ ty = sign == UNSIGNED ? unsignedshort : shorttype;
+ else if (size == LONG && type == DOUBLE)
+ ty = longdouble;
+ else if (size == LONG+LONG) {
+ ty = sign == UNSIGNED ? unsignedlonglong : longlong;
+ if (Aflag >= 1)
+ warning("`%t' is a non-ANSI type\n", ty);
+ } else if (size == LONG)
+ ty = sign == UNSIGNED ? unsignedlong : longtype;
+ else if (sign == UNSIGNED && type == INT)
+ ty = unsignedtype;
+ if (cons == CONST)
+ ty = qual(CONST, ty);
+ if (vol == VOLATILE)
+ ty = qual(VOLATILE, ty);
+ return ty;
+}
+static void decl(Symbol (*dcl)(int, char *, Type, Coordinate *)) {
+ int sclass;
+ Type ty, ty1;
+ static char stop[] = { CHAR, STATIC, ID, 0 };
+
+ ty = specifier(&sclass);
+ if (t == ID || t == '*' || t == '(' || t == '[') {
+ char *id;
+ Coordinate pos;
+ id = NULL;
+ pos = src;
+ if (level == GLOBAL) {
+ Symbol *params = NULL;
+ ty1 = dclr(ty, &id, ¶ms, 0);
+ if (params && id && isfunc(ty1)
+ && (t == '{' || istypename(t, tsym)
+ || (kind[t] == STATIC && t != TYPEDEF))) {
+ if (sclass == TYPEDEF) {
+ error("invalid use of `typedef'\n");
+ sclass = EXTERN;
+ }
+ if (ty1->u.f.oldstyle)
+ exitscope();
+ funcdefn(sclass, id, ty1, params, pos);
+ return;
+ } else if (params)
+ exitparams(params);
+ } else
+ ty1 = dclr(ty, &id, NULL, 0);
+ for (;;) {
+ if (Aflag >= 1 && !hasproto(ty1))
+ warning("missing prototype\n");
+ if (id == NULL)
+ error("missing identifier\n");
+ else if (sclass == TYPEDEF)
+ {
+ Symbol p = lookup(id, identifiers);
+ if (p && p->scope == level)
+ error("redeclaration of `%s'\n", id);
+ p = install(id, &identifiers, level,
+ level < LOCAL ? PERM : FUNC);
+ p->type = ty1;
+ p->sclass = TYPEDEF;
+ p->src = pos;
+ }
+ else
+ (void)(*dcl)(sclass, id, ty1, &pos);
+ if (t != ',')
+ break;
+ t = gettok();
+ id = NULL;
+ pos = src;
+ ty1 = dclr(ty, &id, NULL, 0);
+ }
+ } else if (ty == NULL
+ || !(isenum(ty) ||
+ isstruct(ty) && (*unqual(ty)->u.sym->name < '1' || *unqual(ty)->u.sym->name > '9')))
+ error("empty declaration\n");
+ test(';', stop);
+}
+static Symbol dclglobal(int sclass, char *id, Type ty, Coordinate *pos) {
+ Symbol p;
+
+ if (sclass == 0)
+ sclass = AUTO;
+ else if (sclass != EXTERN && sclass != STATIC) {
+ error("invalid storage class `%k' for `%t %s'\n",
+ sclass, ty, id);
+ sclass = AUTO;
+ }
+ p = lookup(id, identifiers);
+ if (p && p->scope == GLOBAL) {
+ if (p->sclass != TYPEDEF && eqtype(ty, p->type, 1))
+ ty = compose(ty, p->type);
+ else
+ error("redeclaration of `%s' previously declared at %w\n", p->name, &p->src);
+
+ if (!isfunc(ty) && p->defined && t == '=')
+ error("redefinition of `%s' previously defined at %w\n", p->name, &p->src);
+
+ if (p->sclass == EXTERN && sclass == STATIC
+ || p->sclass == STATIC && sclass == AUTO
+ || p->sclass == AUTO && sclass == STATIC)
+ warning("inconsistent linkage for `%s' previously declared at %w\n", p->name, &p->src);
+
+ }
+ if (p == NULL || p->scope != GLOBAL) {
+ Symbol q = lookup(id, externals);
+ if (q) {
+ if (sclass == STATIC || !eqtype(ty, q->type, 1))
+ warning("declaration of `%s' does not match previous declaration at %w\n", id, &q->src);
+
+ p = relocate(id, externals, globals);
+ p->sclass = sclass;
+ } else {
+ p = install(id, &globals, GLOBAL, PERM);
+ p->sclass = sclass;
+ (*IR->defsymbol)(p);
+ }
+ if (p->sclass != STATIC) {
+ static int nglobals;
+ nglobals++;
+ if (Aflag >= 2 && nglobals == 512)
+ warning("more than 511 external identifiers\n");
+ }
+ } else if (p->sclass == EXTERN)
+ p->sclass = sclass;
+ p->type = ty;
+ p->src = *pos;
+ if (t == '=' && isfunc(p->type)) {
+ error("illegal initialization for `%s'\n", p->name);
+ t = gettok();
+ initializer(p->type, 0);
+ } else if (t == '=') {
+ initglobal(p, 0);
+ if (glevel > 0 && IR->stabsym) {
+ (*IR->stabsym)(p); swtoseg(p->u.seg); }
+ } else if (p->sclass == STATIC && !isfunc(p->type)
+ && p->type->size == 0)
+ error("undefined size for `%t %s'\n", p->type, p->name);
+ return p;
+}
+static void initglobal(Symbol p, int flag) {
+ Type ty;
+
+ if (t == '=' || flag) {
+ if (p->sclass == STATIC) {
+ for (ty = p->type; isarray(ty); ty = ty->type)
+ ;
+ defglobal(p, isconst(ty) ? LIT : DATA);
+ } else
+ defglobal(p, DATA);
+ if (t == '=')
+ t = gettok();
+ ty = initializer(p->type, 0);
+ if (isarray(p->type) && p->type->size == 0)
+ p->type = ty;
+ if (p->sclass == EXTERN)
+ p->sclass = AUTO;
+ }
+}
+void defglobal(Symbol p, int seg) {
+ p->u.seg = seg;
+ swtoseg(p->u.seg);
+ if (p->sclass != STATIC)
+ (*IR->export)(p);
+ (*IR->global)(p);
+ p->defined = 1;
+}
+
+static Type dclr(Type basety, char **id, Symbol **params, int abstract) {
+ Type ty = dclr1(id, params, abstract);
+
+ for ( ; ty; ty = ty->type)
+ switch (ty->op) {
+ case POINTER:
+ basety = ptr(basety);
+ break;
+ case FUNCTION:
+ basety = func(basety, ty->u.f.proto,
+ ty->u.f.oldstyle);
+ break;
+ case ARRAY:
+ basety = array(basety, ty->size, 0);
+ break;
+ case CONST: case VOLATILE:
+ basety = qual(ty->op, basety);
+ break;
+ default: assert(0);
+ }
+ if (Aflag >= 2 && basety->size > 32767)
+ warning("more than 32767 bytes in `%t'\n", basety);
+ return basety;
+}
+static Type tnode(int op, Type type) {
+ Type ty;
+
+ NEW0(ty, STMT);
+ ty->op = op;
+ ty->type = type;
+ return ty;
+}
+static Type dclr1(char **id, Symbol **params, int abstract) {
+ Type ty = NULL;
+
+ switch (t) {
+ case ID: if (id)
+ *id = token;
+ else
+ error("extraneous identifier `%s'\n", token);
+ t = gettok(); break;
+ case '*': t = gettok(); if (t == CONST || t == VOLATILE) {
+ Type ty1;
+ ty1 = ty = tnode(t, NULL);
+ while ((t = gettok()) == CONST || t == VOLATILE)
+ ty1 = tnode(t, ty1);
+ ty->type = dclr1(id, params, abstract);
+ ty = ty1;
+ } else
+ ty = dclr1(id, params, abstract);
+ ty = tnode(POINTER, ty); break;
+ case '(': t = gettok(); if (abstract
+ && (t == REGISTER || istypename(t, tsym) || t == ')')) {
+ Symbol *args;
+ ty = tnode(FUNCTION, ty);
+ enterscope();
+ if (level > PARAM)
+ enterscope();
+ args = parameters(ty);
+ exitparams(args);
+ } else {
+ ty = dclr1(id, params, abstract);
+ expect(')');
+ if (abstract && ty == NULL
+ && (id == NULL || *id == NULL))
+ return tnode(FUNCTION, NULL);
+ } break;
+ case '[': break;
+ default: return ty;
+ }
+ while (t == '(' || t == '[')
+ switch (t) {
+ case '(': t = gettok(); { Symbol *args;
+ ty = tnode(FUNCTION, ty);
+ enterscope();
+ if (level > PARAM)
+ enterscope();
+ args = parameters(ty);
+ if (params && *params == NULL)
+ *params = args;
+ else
+ exitparams(args);
+ }
+ break;
+ case '[': t = gettok(); { int n = 0;
+ if (kind[t] == ID) {
+ n = intexpr(']', 1);
+ if (n <= 0) {
+ error("`%d' is an illegal array size\n", n);
+ n = 1;
+ }
+ } else
+ expect(']');
+ ty = tnode(ARRAY, ty);
+ ty->size = n; } break;
+ default: assert(0);
+ }
+ return ty;
+}
+static Symbol *parameters(Type fty) {
+ List list = NULL;
+ Symbol *params;
+
+ if (kind[t] == STATIC || istypename(t, tsym)) {
+ int n = 0;
+ Type ty1 = NULL;
+ for (;;) {
+ Type ty;
+ int sclass = 0;
+ char *id = NULL;
+ if (ty1 && t == ELLIPSIS) {
+ static struct symbol sentinel;
+ if (sentinel.type == NULL) {
+ sentinel.type = voidtype;
+ sentinel.defined = 1;
+ }
+ if (ty1 == voidtype)
+ error("illegal formal parameter types\n");
+ list = append(&sentinel, list);
+ t = gettok();
+ break;
+ }
+ if (!istypename(t, tsym) && t != REGISTER)
+ error("missing parameter type\n");
+ n++;
+ ty = dclr(specifier(&sclass), &id, NULL, 1);
+ if ( ty == voidtype && (ty1 || id)
+ || ty1 == voidtype)
+ error("illegal formal parameter types\n");
+ if (id == NULL)
+ id = stringd(n);
+ if (ty != voidtype)
+ list = append(dclparam(sclass, id, ty, &src), list);
+ if (Aflag >= 1 && !hasproto(ty))
+ warning("missing prototype\n");
+ if (ty1 == NULL)
+ ty1 = ty;
+ if (t != ',')
+ break;
+ t = gettok();
+ }
+ fty->u.f.proto = newarray(length(list) + 1,
+ sizeof (Type *), PERM);
+ params = ltov(&list, FUNC);
+ for (n = 0; params[n]; n++)
+ fty->u.f.proto[n] = params[n]->type;
+ fty->u.f.proto[n] = NULL;
+ fty->u.f.oldstyle = 0;
+ } else {
+ if (t == ID)
+ for (;;) {
+ Symbol p;
+ if (t != ID) {
+ error("expecting an identifier\n");
+ break;
+ }
+ p = dclparam(0, token, inttype, &src);
+ p->defined = 0;
+ list = append(p, list);
+ t = gettok();
+ if (t != ',')
+ break;
+ t = gettok();
+ }
+ params = ltov(&list, FUNC);
+ fty->u.f.proto = NULL;
+ fty->u.f.oldstyle = 1;
+ }
+ if (t != ')') {
+ static char stop[] = { CHAR, STATIC, IF, ')', 0 };
+ expect(')');
+ skipto('{', stop);
+ }
+ if (t == ')')
+ t = gettok();
+ return params;
+}
+static void exitparams(Symbol params[]) {
+ assert(params);
+ if (params[0] && !params[0]->defined)
+ error("extraneous old-style parameter list\n");
+ if (level > PARAM)
+ exitscope();
+ exitscope();
+}
+
+static Symbol dclparam(int sclass, char *id, Type ty, Coordinate *pos) {
+ Symbol p;
+
+ if (isfunc(ty))
+ ty = ptr(ty);
+ else if (isarray(ty))
+ ty = atop(ty);
+ if (sclass == 0)
+ sclass = AUTO;
+ else if (sclass != REGISTER) {
+ error("invalid storage class `%k' for `%t%s\n",
+ sclass, ty, stringf(id ? " %s'" : "' parameter", id));
+ sclass = AUTO;
+ } else if (isvolatile(ty) || isstruct(ty)) {
+ warning("register declaration ignored for `%t%s\n",
+ ty, stringf(id ? " %s'" : "' parameter", id));
+ sclass = AUTO;
+ }
+
+ p = lookup(id, identifiers);
+ if (p && p->scope == level)
+ error("duplicate declaration for `%s' previously declared at %w\n", id, &p->src);
+
+ else
+ p = install(id, &identifiers, level, FUNC);
+ p->sclass = sclass;
+ p->src = *pos;
+ p->type = ty;
+ p->defined = 1;
+ if (t == '=') {
+ error("illegal initialization for parameter `%s'\n", id);
+ t = gettok();
+ (void)expr1(0);
+ }
+ return p;
+}
+static Type structdcl(int op) {
+ char *tag;
+ Type ty;
+ Symbol p;
+ Coordinate pos;
+
+ t = gettok();
+ pos = src;
+ if (t == ID) {
+ tag = token;
+ t = gettok();
+ } else
+ tag = "";
+ if (t == '{') {
+ static char stop[] = { IF, ',', 0 };
+ ty = newstruct(op, tag);
+ ty->u.sym->src = pos;
+ ty->u.sym->defined = 1;
+ t = gettok();
+ if (istypename(t, tsym))
+ fields(ty);
+ else
+ error("invalid %k field declarations\n", op);
+ test('}', stop);
+ }
+ else if (*tag && (p = lookup(tag, types)) != NULL
+ && p->type->op == op) {
+ ty = p->type;
+ if (t == ';' && p->scope < level)
+ ty = newstruct(op, tag);
+ }
+ else {
+ if (*tag == 0)
+ error("missing %k tag\n", op);
+ ty = newstruct(op, tag);
+ }
+ if (*tag && xref)
+ use(ty->u.sym, pos);
+ return ty;
+}
+static void fields(Type ty) {
+ { int n = 0;
+ while (istypename(t, tsym)) {
+ static char stop[] = { IF, CHAR, '}', 0 };
+ Type ty1 = specifier(NULL);
+ for (;;) {
+ Field p;
+ char *id = NULL;
+ Type fty = dclr(ty1, &id, NULL, 0);
+ p = newfield(id, ty, fty);
+ if (Aflag >= 1 && !hasproto(p->type))
+ warning("missing prototype\n");
+ if (t == ':') {
+ if (unqual(p->type) != inttype
+ && unqual(p->type) != unsignedtype) {
+ error("`%t' is an illegal bit-field type\n",
+ p->type);
+ p->type = inttype;
+ }
+ t = gettok();
+ p->bitsize = intexpr(0, 0);
+ if (p->bitsize > 8*inttype->size || p->bitsize < 0) {
+ error("`%d' is an illegal bit-field size\n",
+ p->bitsize);
+ p->bitsize = 8*inttype->size;
+ } else if (p->bitsize == 0 && id) {
+ warning("extraneous 0-width bit field `%t %s' ignored\n", p->type, id);
+
+ p->name = stringd(genlabel(1));
+ }
+ p->lsb = 1;
+ }
+ else {
+ if (id == NULL)
+ error("field name missing\n");
+ else if (isfunc(p->type))
+ error("`%t' is an illegal field type\n", p->type);
+ else if (p->type->size == 0)
+ error("undefined size for field `%t %s'\n",
+ p->type, id);
+ }
+ if (isconst(p->type))
+ ty->u.sym->u.s.cfields = 1;
+ if (isvolatile(p->type))
+ ty->u.sym->u.s.vfields = 1;
+ n++;
+ if (Aflag >= 2 && n == 128)
+ warning("more than 127 fields in `%t'\n", ty);
+ if (t != ',')
+ break;
+ t = gettok();
+ }
+ test(';', stop);
+ } }
+ { int bits = 0, off = 0, overflow = 0;
+ Field p, *q = &ty->u.sym->u.s.flist;
+ ty->align = IR->structmetric.align;
+ for (p = *q; p; p = p->link) {
+ int a = p->type->align ? p->type->align : 1;
+ if (p->lsb)
+ a = unsignedtype->align;
+ if (ty->op == UNION)
+ off = bits = 0;
+ else if (p->bitsize == 0 || bits == 0
+ || bits - 1 + p->bitsize > 8*unsignedtype->size) {
+ off = add(off, bits2bytes(bits-1));
+ bits = 0;
+ chkoverflow(off, a - 1);
+ off = roundup(off, a);
+ }
+ if (a > ty->align)
+ ty->align = a;
+ p->offset = off;
+
+ if (p->lsb) {
+ if (bits == 0)
+ bits = 1;
+ if (IR->little_endian)
+ p->lsb = bits;
+ else
+ p->lsb = 8*unsignedtype->size - bits + 1
+ - p->bitsize + 1;
+ bits += p->bitsize;
+ } else
+ off = add(off, p->type->size);
+ if (off + bits2bytes(bits-1) > ty->size)
+ ty->size = off + bits2bytes(bits-1);
+ if (p->name == NULL
+ || !('1' <= *p->name && *p->name <= '9')) {
+ *q = p;
+ q = &p->link;
+ }
+ }
+ *q = NULL;
+ chkoverflow(ty->size, ty->align - 1);
+ ty->size = roundup(ty->size, ty->align);
+ if (overflow) {
+ error("size of `%t' exceeds %d bytes\n", ty, inttype->u.sym->u.limits.max.i);
+ ty->size = inttype->u.sym->u.limits.max.i&(~(ty->align - 1));
+ } }
+}
+static void funcdefn(int sclass, char *id, Type ty, Symbol params[], Coordinate pt) {
+ int i, n;
+ Symbol *callee, *caller, p;
+ Type rty = freturn(ty);
+
+ if (isstruct(rty) && rty->size == 0)
+ error("illegal use of incomplete type `%t'\n", rty);
+ for (n = 0; params[n]; n++)
+ ;
+ if (n > 0 && params[n-1]->name == NULL)
+ params[--n] = NULL;
+ if (Aflag >= 2 && n > 31)
+ warning("more than 31 parameters in function `%s'\n", id);
+ if (ty->u.f.oldstyle) {
+ if (Aflag >= 1)
+ warning("old-style function definition for `%s'\n", id);
+ caller = params;
+ callee = newarray(n + 1, sizeof *callee, FUNC);
+ memcpy(callee, caller, (n+1)*sizeof *callee);
+ enterscope();
+ assert(level == PARAM);
+ while (kind[t] == STATIC || istypename(t, tsym))
+ decl(dclparam);
+ foreach(identifiers, PARAM, oldparam, callee);
+
+ for (i = 0; (p = callee[i]) != NULL; i++) {
+ if (!p->defined)
+ callee[i] = dclparam(0, p->name, inttype, &p->src);
+ *caller[i] = *p;
+ caller[i]->sclass = AUTO;
+ caller[i]->type = promote(p->type);
+ }
+ p = lookup(id, identifiers);
+ if (p && p->scope == GLOBAL && isfunc(p->type)
+ && p->type->u.f.proto) {
+ Type *proto = p->type->u.f.proto;
+ for (i = 0; caller[i] && proto[i]; i++) {
+ Type ty = unqual(proto[i]);
+ if (eqtype(isenum(ty) ? ty->type : ty,
+ unqual(caller[i]->type), 1) == 0)
+ break;
+ else if (isenum(ty) && !isenum(unqual(caller[i]->type)))
+ warning("compatibility of `%t' and `%t' is compiler dependent\n",
+ proto[i], caller[i]->type);
+ }
+ if (proto[i] || caller[i])
+ error("conflicting argument declarations for function `%s'\n", id);
+
+ }
+ else {
+ Type *proto = newarray(n + 1, sizeof *proto, PERM);
+ if (Aflag >= 1)
+ warning("missing prototype for `%s'\n", id);
+ for (i = 0; i < n; i++)
+ proto[i] = caller[i]->type;
+ proto[i] = NULL;
+ ty = func(rty, proto, 1);
+ }
+ } else {
+ callee = params;
+ caller = newarray(n + 1, sizeof *caller, FUNC);
+ for (i = 0; (p = callee[i]) != NULL && p->name; i++) {
+ NEW(caller[i], FUNC);
+ *caller[i] = *p;
+ if (isint(p->type))
+ caller[i]->type = promote(p->type);
+ caller[i]->sclass = AUTO;
+ if ('1' <= *p->name && *p->name <= '9')
+ error("missing name for parameter %d to function `%s'\n", i + 1, id);
+
+ }
+ caller[i] = NULL;
+ }
+ for (i = 0; (p = callee[i]) != NULL; i++)
+ if (p->type->size == 0) {
+ error("undefined size for parameter `%t %s'\n",
+ p->type, p->name);
+ caller[i]->type = p->type = inttype;
+ }
+ if (Aflag >= 2 && sclass != STATIC && strcmp(id, "main") == 0) {
+ if (ty->u.f.oldstyle)
+ warning("`%t %s()' is a non-ANSI definition\n", rty, id);
+ else if (!(rty == inttype
+ && (n == 0 && callee[0] == NULL
+ || n == 2 && callee[0]->type == inttype
+ && isptr(callee[1]->type) && callee[1]->type->type == charptype
+ && !variadic(ty))))
+ warning("`%s' is a non-ANSI definition\n", typestring(ty, id));
+ }
+ p = lookup(id, identifiers);
+ if (p && isfunc(p->type) && p->defined)
+ error("redefinition of `%s' previously defined at %w\n",
+ p->name, &p->src);
+ cfunc = dclglobal(sclass, id, ty, &pt);
+ cfunc->u.f.label = genlabel(1);
+ cfunc->u.f.callee = callee;
+ cfunc->u.f.pt = src;
+ cfunc->defined = 1;
+ if (xref)
+ use(cfunc, cfunc->src);
+ if (Pflag)
+ printproto(cfunc, cfunc->u.f.callee);
+ if (ncalled >= 0)
+ ncalled = findfunc(cfunc->name, pt.file);
+ labels = table(NULL, LABELS);
+ stmtlabs = table(NULL, LABELS);
+ refinc = 1.0;
+ regcount = 0;
+ codelist = &codehead;
+ codelist->next = NULL;
+ if (!IR->wants_callb && isstruct(rty))
+ retv = genident(AUTO, ptr(rty), PARAM);
+ compound(0, NULL, 0);
+
+ {
+ Code cp;
+ for (cp = codelist; cp->kind < Label; cp = cp->prev)
+ ;
+ if (cp->kind != Jump) {
+ if (rty != voidtype) {
+ warning("missing return value\n");
+ retcode(cnsttree(inttype, 0L));
+ } else
+ retcode(NULL);
+ }
+ }
+ definelab(cfunc->u.f.label);
+ if (events.exit)
+ apply(events.exit, cfunc, NULL);
+ walk(NULL, 0, 0);
+ exitscope();
+ assert(level == PARAM);
+ foreach(identifiers, level, checkref, NULL);
+ if (!IR->wants_callb && isstruct(rty)) {
+ Symbol *a;
+ a = newarray(n + 2, sizeof *a, FUNC);
+ a[0] = retv;
+ memcpy(&a[1], callee, (n+1)*sizeof *callee);
+ callee = a;
+ a = newarray(n + 2, sizeof *a, FUNC);
+ NEW(a[0], FUNC);
+ *a[0] = *retv;
+ memcpy(&a[1], caller, (n+1)*sizeof *callee);
+ caller = a;
+ }
+ if (!IR->wants_argb)
+ for (i = 0; caller[i]; i++)
+ if (isstruct(caller[i]->type)) {
+ caller[i]->type = ptr(caller[i]->type);
+ callee[i]->type = ptr(callee[i]->type);
+ caller[i]->structarg = callee[i]->structarg = 1;
+ }
+ if (glevel > 1) for (i = 0; callee[i]; i++) callee[i]->sclass = AUTO;
+ if (cfunc->sclass != STATIC)
+ (*IR->export)(cfunc);
+ if (glevel && IR->stabsym) {
+ swtoseg(CODE); (*IR->stabsym)(cfunc); }
+ swtoseg(CODE);
+ (*IR->function)(cfunc, caller, callee, cfunc->u.f.ncalls);
+ if (glevel && IR->stabfend)
+ (*IR->stabfend)(cfunc, lineno);
+ foreach(stmtlabs, LABELS, checklab, NULL);
+ exitscope();
+ expect('}');
+ labels = stmtlabs = NULL;
+ retv = NULL;
+ cfunc = NULL;
+}
+static void oldparam(Symbol p, void *cl) {
+ int i;
+ Symbol *callee = cl;
+
+ for (i = 0; callee[i]; i++)
+ if (p->name == callee[i]->name) {
+ callee[i] = p;
+ return;
+ }
+ error("declared parameter `%s' is missing\n", p->name);
+}
+void compound(int loop, struct swtch *swp, int lev) {
+ Code cp;
+ int nregs;
+
+ walk(NULL, 0, 0);
+ cp = code(Blockbeg);
+ enterscope();
+ assert(level >= LOCAL);
+ if (level == LOCAL && events.entry)
+ apply(events.entry, cfunc, NULL);
+ definept(NULL);
+ expect('{');
+ autos = registers = NULL;
+ if (level == LOCAL && IR->wants_callb
+ && isstruct(freturn(cfunc->type))) {
+ retv = genident(AUTO, ptr(freturn(cfunc->type)), level);
+ retv->defined = 1;
+ retv->ref = 1;
+ registers = append(retv, registers);
+ }
+ while (kind[t] == CHAR || kind[t] == STATIC
+ || istypename(t, tsym) && getchr() != ':')
+ decl(dcllocal);
+ {
+ int i;
+ Symbol *a = ltov(&autos, STMT);
+ nregs = length(registers);
+ for (i = 0; a[i]; i++)
+ registers = append(a[i], registers);
+ cp->u.block.locals = ltov(®isters, FUNC);
+ }
+ if (events.blockentry)
+ apply(events.blockentry, cp->u.block.locals, NULL);
+ while (kind[t] == IF || kind[t] == ID)
+ statement(loop, swp, lev);
+ walk(NULL, 0, 0);
+ foreach(identifiers, level, checkref, NULL);
+ {
+ int i = nregs, j;
+ Symbol p;
+ for ( ; (p = cp->u.block.locals[i]) != NULL; i++) {
+ for (j = i; j > nregs
+ && cp->u.block.locals[j-1]->ref < p->ref; j--)
+ cp->u.block.locals[j] = cp->u.block.locals[j-1];
+ cp->u.block.locals[j] = p;
+ }
+ }
+ if (events.blockexit)
+ apply(events.blockexit, cp->u.block.locals, NULL);
+ cp->u.block.level = level;
+ cp->u.block.identifiers = identifiers;
+ cp->u.block.types = types;
+ code(Blockend)->u.begin = cp;
+ if (reachable(Gen))
+ definept(NULL);
+ if (level > LOCAL) {
+ exitscope();
+ expect('}');
+ }
+}
+static void checkref(Symbol p, void *cl) {
+ if (p->scope >= PARAM
+ && (isvolatile(p->type) || isfunc(p->type)))
+ p->addressed = 1;
+ if (Aflag >= 2 && p->defined && p->ref == 0) {
+ if (p->sclass == STATIC)
+ warning("static `%t %s' is not referenced\n",
+ p->type, p->name);
+ else if (p->scope == PARAM)
+ warning("parameter `%t %s' is not referenced\n",
+ p->type, p->name);
+ else if (p->scope >= LOCAL && p->sclass != EXTERN)
+ warning("local `%t %s' is not referenced\n",
+ p->type, p->name);
+ }
+ if (p->sclass == AUTO
+ && (p->scope == PARAM && regcount == 0
+ || p->scope >= LOCAL)
+ && !p->addressed && isscalar(p->type) && p->ref >= 3.0)
+ p->sclass = REGISTER;
+ if (level == GLOBAL && p->sclass == STATIC && !p->defined
+ && isfunc(p->type) && p->ref)
+ error("undefined static `%t %s'\n", p->type, p->name);
+ assert(!(level == GLOBAL && p->sclass == STATIC && !p->defined && !isfunc(p->type)));
+}
+static Symbol dcllocal(int sclass, char *id, Type ty, Coordinate *pos) {
+ Symbol p, q;
+
+ if (sclass == 0)
+ sclass = isfunc(ty) ? EXTERN : AUTO;
+ else if (isfunc(ty) && sclass != EXTERN) {
+ error("invalid storage class `%k' for `%t %s'\n",
+ sclass, ty, id);
+ sclass = EXTERN;
+ } else if (sclass == REGISTER
+ && (isvolatile(ty) || isstruct(ty) || isarray(ty))) {
+ warning("register declaration ignored for `%t %s'\n",
+ ty, id);
+ sclass = AUTO;
+ }
+ q = lookup(id, identifiers);
+ if (q && q->scope >= level
+ || q && q->scope == PARAM && level == LOCAL)
+ if (sclass == EXTERN && q->sclass == EXTERN
+ && eqtype(q->type, ty, 1))
+ ty = compose(ty, q->type);
+ else
+ error("redeclaration of `%s' previously declared at %w\n", q->name, &q->src);
+
+ assert(level >= LOCAL);
+ p = install(id, &identifiers, level, sclass == STATIC || sclass == EXTERN ? PERM : FUNC);
+ p->type = ty;
+ p->sclass = sclass;
+ p->src = *pos;
+ switch (sclass) {
+ case EXTERN: q = lookup(id, globals);
+ if (q == NULL || q->sclass == TYPEDEF || q->sclass == ENUM) {
+ q = lookup(id, externals);
+ if (q == NULL) {
+ q = install(p->name, &externals, GLOBAL, PERM);
+ q->type = p->type;
+ q->sclass = EXTERN;
+ q->src = src;
+ (*IR->defsymbol)(q);
+ }
+ }
+ if (!eqtype(p->type, q->type, 1))
+ warning("declaration of `%s' does not match previous declaration at %w\n", q->name, &q->src);
+
+ p->u.alias = q; break;
+ case STATIC: (*IR->defsymbol)(p);
+ initglobal(p, 0);
+ if (!p->defined)
+ if (p->type->size > 0) {
+ defglobal(p, BSS);
+ (*IR->space)(p->type->size);
+ } else
+ error("undefined size for `%t %s'\n",
+ p->type, p->name);
+ p->defined = 1; break;
+ case REGISTER: registers = append(p, registers);
+ regcount++;
+ p->defined = 1;
+ break;
+ case AUTO: autos = append(p, autos);
+ p->defined = 1; break;
+ default: assert(0);
+ }
+ if (t == '=') {
+ Tree e;
+ if (sclass == EXTERN)
+ error("illegal initialization of `extern %s'\n", id);
+ t = gettok();
+ definept(NULL);
+ if (isscalar(p->type)
+ || isstruct(p->type) && t != '{') {
+ if (t == '{') {
+ t = gettok();
+ e = expr1(0);
+ expect('}');
+ } else
+ e = expr1(0);
+ } else {
+ Symbol t1;
+ Type ty = p->type, ty1 = ty;
+ while (isarray(ty1))
+ ty1 = ty1->type;
+ if (!isconst(ty) && (!isarray(ty) || !isconst(ty1)))
+ ty = qual(CONST, ty);
+ t1 = genident(STATIC, ty, GLOBAL);
+ initglobal(t1, 1);
+ if (isarray(p->type) && p->type->size == 0
+ && t1->type->size > 0)
+ p->type = array(p->type->type,
+ t1->type->size/t1->type->type->size, 0);
+ e = idtree(t1);
+ }
+ walk(root(asgn(p, e)), 0, 0);
+ p->ref = 1;
+ }
+ if (!isfunc(p->type) && p->defined && p->type->size <= 0)
+ error("undefined size for `%t %s'\n", p->type, id);
+ return p;
+}
+void finalize(void) {
+ foreach(externals, GLOBAL, doextern, NULL);
+ foreach(identifiers, GLOBAL, doglobal, NULL);
+ foreach(identifiers, GLOBAL, checkref, NULL);
+ foreach(constants, CONSTANTS, doconst, NULL);
+}
+static void doextern(Symbol p, void *cl) {
+ (*IR->import)(p);
+}
+static void doglobal(Symbol p, void *cl) {
+ if (!p->defined && (p->sclass == EXTERN
+ || isfunc(p->type) && p->sclass == AUTO))
+ (*IR->import)(p);
+ else if (!p->defined && !isfunc(p->type)
+ && (p->sclass == AUTO || p->sclass == STATIC)) {
+ if (isarray(p->type)
+ && p->type->size == 0 && p->type->type->size > 0)
+ p->type = array(p->type->type, 1, 0);
+ if (p->type->size > 0) {
+ defglobal(p, BSS);
+ (*IR->space)(p->type->size);
+ if (glevel > 0 && IR->stabsym)
+ (*IR->stabsym)(p);
+ } else
+ error("undefined size for `%t %s'\n",
+ p->type, p->name);
+ p->defined = 1;
+ }
+ if (Pflag
+ && !isfunc(p->type)
+ && !p->generated && p->sclass != EXTERN)
+ printdecl(p, p->type);
+}
+void doconst(Symbol p, void *cl) {
+ if (p->u.c.loc) {
+ assert(p->u.c.loc->u.seg == 0);
+ defglobal(p->u.c.loc, LIT);
+ if (isarray(p->type) && p->type->type == widechar) {
+ unsigned int *s = p->u.c.v.p;
+ int n = p->type->size/widechar->size;
+ while (n-- > 0) {
+ Value v;
+ v.u = *s++;
+ (*IR->defconst)(widechar->op, widechar->size, v);
+ }
+ } else if (isarray(p->type))
+ (*IR->defstring)(p->type->size, p->u.c.v.p);
+ else
+ (*IR->defconst)(p->type->op, p->type->size, p->u.c.v);
+ p->u.c.loc = NULL;
+ }
+}
+void checklab(Symbol p, void *cl) {
+ if (!p->defined)
+ error("undefined label `%s'\n", p->name);
+ p->defined = 1;
+}
+
+Type enumdcl(void) {
+ char *tag;
+ Type ty;
+ Symbol p;
+ Coordinate pos;
+
+ t = gettok();
+ pos = src;
+ if (t == ID) {
+ tag = token;
+ t = gettok();
+ } else
+ tag = "";
+ if (t == '{') {
+ static char follow[] = { IF, 0 };
+ int n = 0;
+ long k = -1;
+ List idlist = 0;
+ ty = newstruct(ENUM, tag);
+ t = gettok();
+ if (t != ID)
+ error("expecting an enumerator identifier\n");
+ while (t == ID) {
+ char *id = token;
+ Coordinate s;
+ if (tsym && tsym->scope == level)
+ error("redeclaration of `%s' previously declared at %w\n",
+ token, &tsym->src);
+ s = src;
+ t = gettok();
+ if (t == '=') {
+ t = gettok();
+ k = intexpr(0, 0);
+ } else {
+ if (k == inttype->u.sym->u.limits.max.i)
+ error("overflow in value for enumeration constant `%s'\n", id);
+ k++;
+ }
+ p = install(id, &identifiers, level, level < LOCAL ? PERM : FUNC);
+ p->src = s;
+ p->type = ty;
+ p->sclass = ENUM;
+ p->u.value = k;
+ idlist = append(p, idlist);
+ n++;
+ if (Aflag >= 2 && n == 128)
+ warning("more than 127 enumeration constants in `%t'\n", ty);
+ if (t != ',')
+ break;
+ t = gettok();
+ if (Aflag >= 2 && t == '}')
+ warning("non-ANSI trailing comma in enumerator list\n");
+ }
+ test('}', follow);
+ ty->type = inttype;
+ ty->size = ty->type->size;
+ ty->align = ty->type->align;
+ ty->u.sym->u.idlist = ltov(&idlist, PERM);
+ ty->u.sym->defined = 1;
+ } else if ((p = lookup(tag, types)) != NULL && p->type->op == ENUM) {
+ ty = p->type;
+ if (t == ';')
+ error("empty declaration\n");
+ } else {
+ error("unknown enumeration `%s'\n", tag);
+ ty = newstruct(ENUM, tag);
+ ty->type = inttype;
+ }
+ if (*tag && xref)
+ use(p, pos);
+ return ty;
+}
+
+Type typename(void) {
+ Type ty = specifier(NULL);
+
+ if (t == '*' || t == '(' || t == '[') {
+ ty = dclr(ty, NULL, NULL, 1);
+ if (Aflag >= 1 && !hasproto(ty))
+ warning("missing prototype\n");
+ }
+ return ty;
+}
+
|