diff options
Diffstat (limited to 'code/tools/lcc/src/decl.c')
-rw-r--r-- | code/tools/lcc/src/decl.c | 1162 |
1 files changed, 1162 insertions, 0 deletions
diff --git a/code/tools/lcc/src/decl.c b/code/tools/lcc/src/decl.c new file mode 100644 index 0000000..132241e --- /dev/null +++ b/code/tools/lcc/src/decl.c @@ -0,0 +1,1162 @@ +#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 = {0}; + 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; +} + |