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decl.c
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#include "c.h"
static char rcsid[] = "$Id$";
#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(unqual(rty)), PARAM);
compound(0, NULL, 0);
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(unqual(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 (level == LOCAL) {
Code cp;
for (cp = codelist; cp->kind < Label; cp = cp->prev)
;
if (cp->kind != Jump) {
if (freturn(cfunc->type) != voidtype) {
warning("missing return value\n");
retcode(cnsttree(inttype, 0L));
} else
retcode(NULL);
}
}
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;
if (isarray(ty))
p->addressed = 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 {