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-rw-r--r--lcc/src/init.c318
1 files changed, 0 insertions, 318 deletions
diff --git a/lcc/src/init.c b/lcc/src/init.c
deleted file mode 100644
index 172d7c0..0000000
--- a/lcc/src/init.c
+++ /dev/null
@@ -1,318 +0,0 @@
-#include "c.h"
-
-
-static int curseg; /* current segment */
-
-/* defpointer - initialize a pointer to p or to 0 if p==0 */
-void defpointer(Symbol p) {
- if (p) {
- (*IR->defaddress)(p);
- p->ref++;
- } else {
- static Value v;
- (*IR->defconst)(P, voidptype->size, v);
- }
-}
-
-/* genconst - generate/check constant expression e; return size */
-static int genconst(Tree e, int def) {
- for (;;)
- switch (generic(e->op)) {
- case ADDRG:
- if (def)
- (*IR->defaddress)(e->u.sym);
- return e->type->size;
- case CNST:
- if (e->op == CNST+P && isarray(e->type)) {
- e = cvtconst(e);
- continue;
- }
- if (def)
- (*IR->defconst)(e->type->op, e->type->size, e->u.v);
- return e->type->size;
- case RIGHT:
- assert(e->kids[0] || e->kids[1]);
- if (e->kids[1] && e->kids[0])
- error("initializer must be constant\n");
- e = e->kids[1] ? e->kids[1] : e->kids[0];
- continue;
- case CVP:
- if (isarith(e->type))
- error("cast from `%t' to `%t' is illegal in constant expressions\n",
- e->kids[0]->type, e->type);
- /* fall thru */
- case CVI: case CVU: case CVF:
- e = e->kids[0];
- continue;
- default:
- error("initializer must be constant\n");
- if (def)
- genconst(consttree(0, inttype), def);
- return inttype->size;
- }
-}
-
-/* initvalue - evaluate a constant expression for a value of integer type ty */
-static Tree initvalue(Type ty) {
- Type aty;
- Tree e;
-
- needconst++;
- e = expr1(0);
- if ((aty = assign(ty, e)) != NULL)
- e = cast(e, aty);
- else {
- error("invalid initialization type; found `%t' expected `%t'\n",
- e->type, ty);
- e = retype(consttree(0, inttype), ty);
- }
- needconst--;
- if (generic(e->op) != CNST) {
- error("initializer must be constant\n");
- e = retype(consttree(0, inttype), ty);
- }
- return e;
-}
-
-/* initarray - initialize array of ty of <= len bytes; if len == 0, go to } */
-static int initarray(int len, Type ty, int lev) {
- int n = 0;
-
- do {
- initializer(ty, lev);
- n += ty->size;
- if ((len > 0 && n >= len) || t != ',')
- break;
- t = gettok();
- } while (t != '}');
- return n;
-}
-
-/* initchar - initialize array of <= len ty characters; if len == 0, go to } */
-static int initchar(int len, Type ty) {
- int n = 0;
- char buf[16], *s = buf;
-
- do {
- *s++ = initvalue(ty)->u.v.i;
- if (++n%inttype->size == 0) {
- (*IR->defstring)(inttype->size, buf);
- s = buf;
- }
- if ((len > 0 && n >= len) || t != ',')
- break;
- t = gettok();
- } while (t != '}');
- if (s > buf)
- (*IR->defstring)(s - buf, buf);
- return n;
-}
-
-/* initend - finish off an initialization at level lev; accepts trailing comma */
-static void initend(int lev, char follow[]) {
- if (lev == 0 && t == ',')
- t = gettok();
- test('}', follow);
-}
-
-/* initfields - initialize <= an unsigned's worth of bit fields in fields p to q */
-static int initfields(Field p, Field q) {
- unsigned int bits = 0;
- int i, n = 0;
-
- do {
- i = initvalue(inttype)->u.v.i;
- if (fieldsize(p) < 8*p->type->size) {
- if ((p->type == inttype &&
- (i < -(int)(fieldmask(p)>>1)-1 || i > (int)(fieldmask(p)>>1)))
- || (p->type == unsignedtype && (i&~fieldmask(p)) != 0))
- warning("initializer exceeds bit-field width\n");
- i &= fieldmask(p);
- }
- bits |= i<<fieldright(p);
- if (IR->little_endian) {
- if (fieldsize(p) + fieldright(p) > n)
- n = fieldsize(p) + fieldright(p);
- } else {
- if (fieldsize(p) + fieldleft(p) > n)
- n = fieldsize(p) + fieldleft(p);
- }
- if (p->link == q)
- break;
- p = p->link;
- } while (t == ',' && (t = gettok()) != 0);
- n = (n + 7)/8;
- for (i = 0; i < n; i++) {
- Value v;
- if (IR->little_endian) {
- v.u = (unsigned char)bits;
- bits >>= 8;
- } else { /* a big endian */
- v.u = (unsigned char)(bits>>(8*(unsignedtype->size - 1)));
- bits <<= 8;
- }
- (*IR->defconst)(U, unsignedchar->size, v);
- }
- return n;
-}
-
-/* initstruct - initialize a struct ty of <= len bytes; if len == 0, go to } */
-static int initstruct(int len, Type ty, int lev) {
- int a, n = 0;
- Field p = ty->u.sym->u.s.flist;
-
- do {
- if (p->offset > n) {
- (*IR->space)(p->offset - n);
- n += p->offset - n;
- }
- if (p->lsb) {
- Field q = p;
- while (q->link && q->link->offset == p->offset)
- q = q->link;
- n += initfields(p, q->link);
- p = q;
- } else {
- initializer(p->type, lev);
- n += p->type->size;
- }
- if (p->link) {
- p = p->link;
- a = p->type->align;
- } else
- a = ty->align;
- if (a && n%a) {
- (*IR->space)(a - n%a);
- n = roundup(n, a);
- }
- if ((len > 0 && n >= len) || t != ',')
- break;
- t = gettok();
- } while (t != '}');
- return n;
-}
-
-/* initializer - constexpr | { constexpr ( , constexpr )* [ , ] } */
-Type initializer(Type ty, int lev) {
- int n = 0;
- Tree e;
- Type aty = NULL;
- static char follow[] = { IF, CHAR, STATIC, 0 };
-
- ty = unqual(ty);
- if (isscalar(ty)) {
- needconst++;
- if (t == '{') {
- t = gettok();
- e = expr1(0);
- initend(lev, follow);
- } else
- e = expr1(0);
- e = pointer(e);
- if ((aty = assign(ty, e)) != NULL)
- e = cast(e, aty);
- else
- error("invalid initialization type; found `%t' expected `%t'\n",
- e->type, ty);
- n = genconst(e, 1);
- deallocate(STMT);
- needconst--;
- }
- if ((isunion(ty) || isstruct(ty)) && ty->size == 0) {
- static char follow[] = { CHAR, STATIC, 0 };
- error("cannot initialize undefined `%t'\n", ty);
- skipto(';', follow);
- return ty;
- } else if (isunion(ty)) {
- if (t == '{') {
- t = gettok();
- n = initstruct(ty->u.sym->u.s.flist->type->size, ty, lev + 1);
- initend(lev, follow);
- } else {
- if (lev == 0)
- error("missing { in initialization of `%t'\n", ty);
- n = initstruct(ty->u.sym->u.s.flist->type->size, ty, lev + 1);
- }
- } else if (isstruct(ty)) {
- if (t == '{') {
- t = gettok();
- n = initstruct(0, ty, lev + 1);
- test('}', follow);
- } else if (lev > 0)
- n = initstruct(ty->size, ty, lev + 1);
- else {
- error("missing { in initialization of `%t'\n", ty);
- n = initstruct(ty->u.sym->u.s.flist->type->size, ty, lev + 1);
- }
- }
- if (isarray(ty))
- aty = unqual(ty->type);
- if (isarray(ty) && ischar(aty)) {
- if (t == SCON) {
- if (ty->size > 0 && ty->size == tsym->type->size - 1)
- tsym->type = array(chartype, ty->size, 0);
- n = tsym->type->size;
- (*IR->defstring)(tsym->type->size, tsym->u.c.v.p);
- t = gettok();
- } else if (t == '{') {
- t = gettok();
- if (t == SCON) {
- ty = initializer(ty, lev + 1);
- initend(lev, follow);
- return ty;
- }
- n = initchar(0, aty);
- test('}', follow);
- } else if (lev > 0 && ty->size > 0)
- n = initchar(ty->size, aty);
- else { /* eg, char c[] = 0; */
- error("missing { in initialization of `%t'\n", ty);
- n = initchar(1, aty);
- }
- } else if (isarray(ty)) {
- if (t == SCON && aty == widechar) {
- int i;
- unsigned int *s = tsym->u.c.v.p;
- if (ty->size > 0 && ty->size == tsym->type->size - widechar->size)
- tsym->type = array(widechar, ty->size/widechar->size, 0);
- n = tsym->type->size;
- for (i = 0; i < n; i += widechar->size) {
- Value v;
- v.u = *s++;
- (*IR->defconst)(widechar->op, widechar->size, v);
- }
- t = gettok();
- } else if (t == '{') {
- t = gettok();
- if (t == SCON && aty == widechar) {
- ty = initializer(ty, lev + 1);
- initend(lev, follow);
- return ty;
- }
- n = initarray(0, aty, lev + 1);
- test('}', follow);
- } else if (lev > 0 && ty->size > 0)
- n = initarray(ty->size, aty, lev + 1);
- else {
- error("missing { in initialization of `%t'\n", ty);
- n = initarray(aty->size, aty, lev + 1);
- }
- }
- if (ty->size) {
- if (n > ty->size)
- error("too many initializers\n");
- else if (n < ty->size)
- (*IR->space)(ty->size - n);
- } else if (isarray(ty) && ty->type->size > 0)
- ty = array(ty->type, n/ty->type->size, 0);
- else
- ty->size = n;
- return ty;
-}
-
-/* swtoseg - switch to segment seg, if necessary */
-void swtoseg(int seg) {
- if (curseg != seg)
- (*IR->segment)(seg);
- curseg = seg;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 12:07:35 +0000