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fix unsafe.Sizeof("abc")

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R=rsc
OCL=25105
CL=25105
This commit is contained in:
Ken Thompson 2009-02-17 13:10:57 -08:00
parent 575257d503
commit 3c0fc400fb
1 changed files with 13 additions and 5 deletions
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18
src/cmd/gc/dcl.c
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@ -1525,7 +1525,7 @@ unsafenmagic(Node *l, Node *r)
{
Node *n;
Sym *s;
Type *t;
Type *t, *tr;
long v;
Val val;
@ -1541,9 +1541,12 @@ unsafenmagic(Node *l, Node *r)
if(strcmp(s->name, "Sizeof") == 0) {
walktype(r, Erv);
if(r->type == T)
tr = r->type;
if(r->op == OLITERAL && r->val.ctype == CTSTR)
tr = types[TSTRING];
if(tr == T)
goto no;
v = r->type->width;
v = tr->width;
goto yes;
}
if(strcmp(s->name, "Offsetof") == 0) {
@ -1555,16 +1558,21 @@ unsafenmagic(Node *l, Node *r)
}
if(strcmp(s->name, "Alignof") == 0) {
walktype(r, Erv);
if (r->type == T)
tr = r->type;
if(r->op == OLITERAL && r->val.ctype == CTSTR)
tr = types[TSTRING];
if(tr == T)
goto no;
// make struct { byte; T; }
t = typ(TSTRUCT);
t->type = typ(TFIELD);
t->type->type = types[TUINT8];
t->type->down = typ(TFIELD);
t->type->down->type = r->type;
t->type->down->type = tr;
// compute struct widths
dowidth(t);
// the offset of T is its required alignment
v = t->type->down->width;
goto yes;