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mirror of https://github.com/golang/go synced 2024-11-22 06:04:39 -07:00
SVN=124030
This commit is contained in:
Ken Thompson 2008-06-22 21:02:06 -07:00
parent 12c2864e4f
commit dee07c884e
2 changed files with 434 additions and 66 deletions

View File

@ -27,7 +27,7 @@ walktype(Node *n, int top)
Type *t; Type *t;
Sym *s; Sym *s;
long lno; long lno;
int et; int et, cl, cr;
/* /*
* walk the whole tree of the body of a function. * walk the whole tree of the body of a function.
@ -229,29 +229,47 @@ loop:
l = n->left; l = n->left;
r = n->right; r = n->right;
if(l == N)
goto ret;
walktype(l, Elv); walktype(l, Elv);
walktype(r, Erv); if(l == N || r == N)
if(l == N || l->type == T)
goto ret; goto ret;
convlit(r, l->type); cl = listcount(l);
if(r == N || r->type == T) cr = listcount(r);
goto ret;
if(r->op == OCALL && l->op == OLIST) { if(cl == cr) {
walktype(r, Erv);
l = ascompatee(n->op, &n->left, &n->right);
if(l != N)
*n = *reorder3(l);
goto ret;
}
if(cr != 1) {
yyerror("bad shape across assignment");
goto ret;
}
switch(r->op) {
case OCALLMETH:
case OCALLINTER:
case OCALL:
walktype(r, Erv);
l = ascompatet(n->op, &n->left, &r->type, 0); l = ascompatet(n->op, &n->left, &r->type, 0);
if(l != N) { if(l != N) {
*n = *nod(OLIST, r, reorder2(l)); *n = *nod(OLIST, r, reorder2(l));
} }
goto ret; break;
}
l = ascompatee(n->op, &n->left, &n->right); case OINDEX:
if(l != N) case OINDEXPTR:
*n = *reorder3(l); if(!isptrto(r->left->type, TMAP))
goto badt;
if(cl != 2)
goto badt;
*n = *mapop(n, top);
break;
}
goto ret; goto ret;
case OBREAK: case OBREAK:
@ -1412,40 +1430,6 @@ mapop(Node *n, int top)
a = n->left; // map a = n->left; // map
r = nod(OLIST, a, r); r = nod(OLIST, a, r);
on = syslook("mapaccess1", 1);
argtype(on, t->down); // any-1
argtype(on, t->type); // any-2
argtype(on, t->down); // any-3
argtype(on, t->type); // any-4
r = nod(OCALL, on, r);
walktype(r, Erv);
r->type = t->type;
break;
// mapaccess2(hmap *map[any]any, key any) (val any, pres bool);
t = fixmap(n->left->type);
if(t == T)
break;
convlit(n->right, t->down);
if(!eqtype(n->right->type, t->down, 0)) {
badtype(n->op, n->right->type, t->down);
break;
}
a = n->right; // key
if(!isptr[t->down->etype]) {
a = nod(OADDR, a, N);
a->type = ptrto(t);
}
r = a;
a = n->left; // map
r = nod(OLIST, a, r);
on = syslook("mapaccess2", 1); on = syslook("mapaccess2", 1);
argtype(on, t->down); // any-1 argtype(on, t->down); // any-1
@ -1458,9 +1442,36 @@ mapop(Node *n, int top)
r->type = t->type; r->type = t->type;
break; break;
access2:
// mapaccess2(hmap *map[any-1]any-2, key any-3) (val-4 any, pres bool);
t = fixmap(n->right->left->type);
if(t == T)
break;
a = n->right->right; // key
r = a;
a = n->right->left; // map
r = nod(OLIST, a, r);
on = syslook("mapaccess2", 1);
argtype(on, t->down); // any-1
argtype(on, t->type); // any-2
argtype(on, t->down); // any-3
argtype(on, t->type); // any-4
n->right = nod(OCALL, on, r);
walktype(n, Etop);
r = n;
break;
case OAS: case OAS:
if(top != Elv) if(top != Elv) {
if(top == Etop)
goto access2;
goto nottop; goto nottop;
}
if(n->left->op != OINDEX) if(n->left->op != OINDEX)
fatal("mapos: AS left not OINDEX"); fatal("mapos: AS left not OINDEX");
@ -1661,7 +1672,7 @@ colas(Node *nl, Node *nr)
/* nl is an expression list. /* nl is an expression list.
* nr is an expression list. * nr is an expression list.
* return a newname-list from * return a newname-list from
* the types from the rhs. * types derived from the rhs.
*/ */
n = N; n = N;
cr = listcount(nr); cr = listcount(nr);
@ -1675,21 +1686,19 @@ colas(Node *nl, Node *nr)
l = listfirst(&savel, &nl); l = listfirst(&savel, &nl);
r = listfirst(&saver, &nr); r = listfirst(&saver, &nr);
loop: while(l != N) {
if(l == N) walktype(r, Erv);
return n; defaultlit(r);
a = old2new(l, r->type);
if(n == N)
n = a;
else
n = nod(OLIST, n, a);
walktype(r, Erv); l = listnext(&savel);
defaultlit(r); r = listnext(&saver);
a = old2new(l, r->type); }
if(n == N) return n;
n = a;
else
n = nod(OLIST, n, a);
l = listnext(&savel);
r = listnext(&saver);
goto loop;
multi: multi:
/* /*
@ -1738,9 +1747,9 @@ multi:
if(t == T || t->etype != TMAP) if(t == T || t->etype != TMAP)
goto badt; goto badt;
a = old2new(nl->left, types[TBOOL]); a = old2new(nl->left, t->type);
n = a; n = a;
a = old2new(nl->right, t->type); a = old2new(nl->right, types[TBOOL]);
n = nod(OLIST, n, a); n = nod(OLIST, n, a);
break; break;
} }

View File

@ -764,3 +764,362 @@ check(void)
// prints(1"check ok\n"); // prints(1"check ok\n");
initsig(); initsig();
} }
typedef struct Link Link;
typedef struct Hmap Hmap;
typedef struct Alg Alg;
struct Alg
{
uint64 (*hash)(uint32, void*);
uint32 (*equal)(uint32, void*, void*);
void (*print)(uint32, void*);
void (*copy)(uint32, void*, void*);
};
struct Link
{
Link* link;
byte data[8];
};
struct Hmap
{
uint32 keysize;
uint32 valsize;
uint32 hint;
Alg* keyalg;
Alg* valalg;
uint32 valoffset;
uint32 ko;
uint32 vo;
uint32 po;
Link* link;
};
static uint64
memhash(uint32 s, void *a)
{
prints("memhash\n");
return 0x12345;
}
static uint32
memequal(uint32 s, void *a, void *b)
{
byte *ba, *bb;
uint32 i;
ba = a;
bb = b;
for(i=0; i<s; i++)
if(ba[i] != bb[i])
return 0;
return 1;
}
static void
memprint(uint32 s, void *a)
{
uint64 v;
v = 0xbadb00b;
switch(s) {
case 1:
v = *(uint8*)a;
break;
case 2:
v = *(uint16*)a;
break;
case 4:
v = *(uint32*)a;
break;
case 8:
v = *(uint64*)a;
break;
}
sys_printint(v);
}
static void
memcopy(uint32 s, void *a, void *b)
{
byte *ba, *bb;
uint32 i;
ba = a;
bb = b;
if(bb == nil) {
for(i=0; i<s; i++)
ba[i] = 0;
return;
}
for(i=0; i<s; i++)
ba[i] = bb[i];
}
static uint64
stringhash(uint32 s, string *a)
{
prints("stringhash\n");
return 0x12345;
}
static uint32
stringequal(uint32 s, string *a, string *b)
{
return cmpstring(*a, *b) == 0;
}
static void
stringprint(uint32 s, string *a)
{
sys_printstring(*a);
}
static void
stringcopy(uint32 s, string *a, string *b)
{
if(b == nil) {
*b = nil;
return;
}
*a = *b;
}
static uint32
rnd(uint32 n, uint32 m)
{
uint32 r;
r = n % m;
if(r)
n += m-r;
return n;
}
static Alg
algarray[] =
{
{ &memhash, &memequal, &memprint, &memcopy },
{ &stringhash, &stringequal, &stringprint, &stringcopy },
};
// newmap(keysize uint32, valsize uint32,
// keyalg uint32, valalg uint32,
// hint uint32) (hmap *map[any]any);
void
sys_newmap(uint32 keysize, uint32 valsize,
uint32 keyalg, uint32 valalg, uint32 hint,
Hmap* ret)
{
Hmap *m;
if(keyalg >= nelem(algarray) ||
valalg >= nelem(algarray)) {
prints("0<=");
sys_printint(keyalg);
prints("<");
sys_printint(nelem(algarray));
prints("\n0<=");
sys_printint(valalg);
prints("<");
sys_printint(nelem(algarray));
prints("\n");
throw("sys_newmap: key/val algorithm out of range");
}
m = mal(sizeof(*m));
m->keysize = keysize;
m->valsize = valsize;
m->keyalg = &algarray[keyalg];
m->valalg = &algarray[valalg];
m->hint = hint;
// these calculations are compiler dependent
m->valoffset = rnd(keysize, valsize);
m->ko = rnd(sizeof(m), keysize);
m->vo = rnd(m->ko+keysize, valsize);
m->po = rnd(m->vo+valsize, 1);
ret = m;
FLUSH(&ret);
if(debug) {
prints("newmap: map=");
sys_printpointer(m);
prints("; keysize=");
sys_printint(keysize);
prints("; valsize=");
sys_printint(valsize);
prints("; keyalg=");
sys_printint(keyalg);
prints("; valalg=");
sys_printint(valalg);
prints("; valoffset=");
sys_printint(m->valoffset);
prints("; ko=");
sys_printint(m->ko);
prints("; vo=");
sys_printint(m->vo);
prints("; po=");
sys_printint(m->po);
prints("\n");
}
}
// mapaccess1(hmap *map[any]any, key any) (val any);
void
sys_mapaccess1(Hmap *m, ...)
{
Link *l;
byte *ak, *av;
ak = (byte*)&m + m->ko;
av = (byte*)&m + m->vo;
for(l=m->link; l!=nil; l=l->link) {
if(m->keyalg->equal(m->keysize, ak, l->data)) {
m->valalg->copy(m->valsize, av, l->data+m->valoffset);
goto out;
}
}
m->valalg->copy(m->valsize, av, 0);
out:
if(1) {
prints("sys_mapaccess1: map=");
sys_printpointer(m);
prints("; key=");
m->keyalg->print(m->keysize, ak);
prints("; val=");
m->valalg->print(m->valsize, av);
prints("\n");
}
}
// mapaccess2(hmap *map[any]any, key any) (val any, pres bool);
void
sys_mapaccess2(Hmap *m, ...)
{
Link *l;
byte *ak, *av, *ap;
ak = (byte*)&m + m->ko;
av = (byte*)&m + m->vo;
ap = (byte*)&m + m->po;
for(l=m->link; l!=nil; l=l->link) {
if(m->keyalg->equal(m->keysize, ak, l->data)) {
*ap = true;
m->valalg->copy(m->valsize, av, l->data+m->valoffset);
goto out;
}
}
*ap = false;
m->valalg->copy(m->valsize, av, nil);
out:
if(debug) {
prints("sys_mapaccess2: map=");
sys_printpointer(m);
prints("; key=");
m->keyalg->print(m->keysize, ak);
prints("; val=");
m->valalg->print(m->valsize, av);
prints("; pres=");
sys_printbool(*ap);
prints("\n");
}
}
static void
sys_mapassign(Hmap *m, byte *ak, byte *av)
{
Link *l;
// mapassign(hmap *map[any]any, key any, val any);
for(l=m->link; l!=nil; l=l->link) {
if(m->keyalg->equal(m->keysize, ak, l->data))
goto out;
}
l = mal((sizeof(*l)-8) + m->keysize + m->valsize);
l->link = m->link;
m->link = l;
m->keyalg->copy(m->keysize, l->data, ak);
out:
m->valalg->copy(m->valsize, l->data+m->valoffset, av);
if(debug) {
prints("mapassign: map=");
sys_printpointer(m);
prints("; key=");
m->keyalg->print(m->keysize, ak);
prints("; val=");
m->valalg->print(m->valsize, av);
prints("\n");
}
}
// mapassign1(hmap *map[any]any, key any, val any);
void
sys_mapassign1(Hmap *m, ...)
{
Link **ll;
byte *ak, *av;
ak = (byte*)&m + m->ko;
av = (byte*)&m + m->vo;
sys_mapassign(m, ak, av);
}
// mapassign2(hmap *map[any]any, key any, val any, pres bool);
void
sys_mapassign2(Hmap *m, ...)
{
Link **ll;
byte *ak, *av, *ap;
ak = (byte*)&m + m->ko;
av = (byte*)&m + m->vo;
ap = (byte*)&m + m->po;
if(*ap == true) {
// assign
sys_mapassign(m, ak, av);
return;
}
// delete
for(ll=&m->link; (*ll)!=nil; ll=&(*ll)->link) {
if(m->keyalg->equal(m->keysize, ak, (*ll)->data)) {
m->valalg->copy(m->valsize, (*ll)->data+m->valoffset, nil);
(*ll) = (*ll)->link;
if(debug) {
prints("mapdelete (found): map=");
sys_printpointer(m);
prints("; key=");
m->keyalg->print(m->keysize, ak);
prints("\n");
}
return;
}
}
if(debug) {
prints("mapdelete (not found): map=");
sys_printpointer(m);
prints("; key=");
m->keyalg->print(m->keysize, ak);
prints(" *** not found\n");
}
}