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add readonly flag to static initialization

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R=rsc
CC=golang-dev
https://golang.org/cl/2187042
This commit is contained in:
Ken Thompson 2010-09-16 16:42:38 -07:00
parent 19075ea609
commit d348971103
4 changed files with 61 additions and 102 deletions
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2
src/cmd/gc/go.h
View File

@ -1023,7 +1023,7 @@ void walkselect(Node *sel);
/*
* sinit.c
*/
void anylit(int ctxt, Node *n, Node *var, NodeList **init);
void anylit(Node *n, Node *var, NodeList **init);
int gen_as_init(Node *n);
NodeList* initfix(NodeList *l);
int oaslit(Node *n, NodeList **init);

112
src/cmd/gc/sinit.c
View File

@ -179,10 +179,23 @@ initfix(NodeList *l)
* part of the composit literal.
*/
static void structlit(int ctxt, int pass, Node *n, Node *var, NodeList **init);
static void arraylit(int ctxt, int pass, Node *n, Node *var, NodeList **init);
static void slicelit(int ctxt, Node *n, Node *var, NodeList **init);
static void maplit(int ctxt, Node *n, Node *var, NodeList **init);
static void structlit(int pass, Node *n, Node *var, NodeList **init);
static void arraylit(int pass, Node *n, Node *var, NodeList **init);
static void slicelit(Node *n, Node *var, NodeList **init);
static void maplit(Node *n, Node *var, NodeList **init);
Node*
staticname(Type *t)
{
Node *n;
snprint(namebuf, sizeof(namebuf), "statictmp_%.4d", statuniqgen);
statuniqgen++;
n = newname(lookup(namebuf));
n->readonly = 1;
addvar(n, t, PEXTERN);
return n;
}
static int
isliteral(Node *n)
@ -257,7 +270,7 @@ getdyn(Node *n, int top)
}
static void
structlit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
structlit(int pass, Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *nl;
@ -273,25 +286,21 @@ structlit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
switch(value->op) {
case OARRAYLIT:
if(value->type->bound < 0) {
if(pass == 1 && ctxt != 0) {
if(pass == 2) {
a = nod(ODOT, var, newname(index->sym));
slicelit(ctxt, value, a, init);
} else
if(pass == 2 && ctxt == 0) {
a = nod(ODOT, var, newname(index->sym));
slicelit(ctxt, value, a, init);
slicelit(value, a, init);
} else
if(pass == 3)
break;
continue;
}
a = nod(ODOT, var, newname(index->sym));
arraylit(ctxt, pass, value, a, init);
arraylit(pass, value, a, init);
continue;
case OSTRUCTLIT:
a = nod(ODOT, var, newname(index->sym));
structlit(ctxt, pass, value, a, init);
structlit(pass, value, a, init);
continue;
}
@ -317,7 +326,7 @@ structlit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
}
static void
arraylit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
arraylit(int pass, Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *l;
@ -333,25 +342,21 @@ arraylit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
switch(value->op) {
case OARRAYLIT:
if(value->type->bound < 0) {
if(pass == 1 && ctxt != 0) {
if(pass == 2) {
a = nod(OINDEX, var, index);
slicelit(ctxt, value, a, init);
} else
if(pass == 2 && ctxt == 0) {
a = nod(OINDEX, var, index);
slicelit(ctxt, value, a, init);
slicelit(value, a, init);
} else
if(pass == 3)
break;
continue;
}
a = nod(OINDEX, var, index);
arraylit(ctxt, pass, value, a, init);
arraylit(pass, value, a, init);
continue;
case OSTRUCTLIT:
a = nod(OINDEX, var, index);
structlit(ctxt, pass, value, a, init);
structlit(pass, value, a, init);
continue;
}
@ -377,7 +382,7 @@ arraylit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
}
static void
slicelit(int ctxt, Node *n, Node *var, NodeList **init)
slicelit(Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *l;
@ -393,22 +398,6 @@ slicelit(int ctxt, Node *n, Node *var, NodeList **init)
t->sym = nil;
dowidth(t);
if(ctxt != 0) {
// put everything into static array
vstat = staticname(t);
arraylit(ctxt, 1, n, vstat, init);
arraylit(ctxt, 2, n, vstat, init);
// copy static to slice
a = nod(OSLICE, vstat, nod(OKEY, N, N));
a = nod(OAS, var, a);
typecheck(&a, Etop);
a->dodata = 2;
*init = list(*init, a);
return;
}
// recipe for var = []t{...}
// 1. make a static array
// var vstat [...]t
@ -434,7 +423,7 @@ slicelit(int ctxt, Node *n, Node *var, NodeList **init)
mode = getdyn(n, 1);
if(mode & MODECONST) {
vstat = staticname(t);
arraylit(ctxt, 1, n, vstat, init);
arraylit(1, n, vstat, init);
}
// make new auto *array (3 declare)
@ -479,11 +468,11 @@ slicelit(int ctxt, Node *n, Node *var, NodeList **init)
case OARRAYLIT:
if(value->type->bound < 0)
break;
arraylit(ctxt, 2, value, a, init);
arraylit(2, value, a, init);
continue;
case OSTRUCTLIT:
structlit(ctxt, 2, value, a, init);
structlit(2, value, a, init);
continue;
}
@ -499,7 +488,7 @@ slicelit(int ctxt, Node *n, Node *var, NodeList **init)
}
static void
maplit(int ctxt, Node *n, Node *var, NodeList **init)
maplit(Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *l;
@ -651,7 +640,7 @@ maplit(int ctxt, Node *n, Node *var, NodeList **init)
}
void
anylit(int ctxt, Node *n, Node *var, NodeList **init)
anylit(Node *n, Node *var, NodeList **init)
{
Type *t;
Node *a, *vstat;
@ -666,11 +655,9 @@ anylit(int ctxt, Node *n, Node *var, NodeList **init)
fatal("anylit: not struct");
if(simplename(var)) {
if(ctxt == 0) {
// lay out static data
vstat = staticname(t);
structlit(1, 1, n, vstat, init);
structlit(1, n, vstat, init);
// copy static to var
a = nod(OAS, var, vstat);
@ -679,11 +666,7 @@ anylit(int ctxt, Node *n, Node *var, NodeList **init)
*init = list(*init, a);
// add expressions to automatic
structlit(ctxt, 2, n, var, init);
break;
}
structlit(ctxt, 1, n, var, init);
structlit(ctxt, 2, n, var, init);
structlit(2, n, var, init);
break;
}
@ -694,23 +677,21 @@ anylit(int ctxt, Node *n, Node *var, NodeList **init)
walkexpr(&a, init);
*init = list(*init, a);
}
structlit(ctxt, 3, n, var, init);
structlit(3, n, var, init);
break;
case OARRAYLIT:
if(t->etype != TARRAY)
fatal("anylit: not array");
if(t->bound < 0) {
slicelit(ctxt, n, var, init);
slicelit(n, var, init);
break;
}
if(simplename(var)) {
if(ctxt == 0) {
// lay out static data
vstat = staticname(t);
arraylit(1, 1, n, vstat, init);
arraylit(1, n, vstat, init);
// copy static to automatic
a = nod(OAS, var, vstat);
@ -719,11 +700,7 @@ anylit(int ctxt, Node *n, Node *var, NodeList **init)
*init = list(*init, a);
// add expressions to automatic
arraylit(ctxt, 2, n, var, init);
break;
}
arraylit(ctxt, 1, n, var, init);
arraylit(ctxt, 2, n, var, init);
arraylit(2, n, var, init);
break;
}
@ -734,13 +711,13 @@ anylit(int ctxt, Node *n, Node *var, NodeList **init)
walkexpr(&a, init);
*init = list(*init, a);
}
arraylit(ctxt, 3, n, var, init);
arraylit(3, n, var, init);
break;
case OMAPLIT:
if(t->etype != TMAP)
fatal("anylit: not map");
maplit(ctxt, n, var, init);
maplit(n, var, init);
break;
}
}
@ -748,8 +725,6 @@ anylit(int ctxt, Node *n, Node *var, NodeList **init)
int
oaslit(Node *n, NodeList **init)
{
int ctxt;
if(n->left == N || n->right == N)
goto no;
if(n->left->type == T || n->right->type == T)
@ -762,9 +737,6 @@ oaslit(Node *n, NodeList **init)
// context is init() function.
// implies generated data executed
// exactly once and not subject to races.
ctxt = 0;
if(n->dodata == 1)
ctxt = 1;
switch(n->right->op) {
default:
@ -775,7 +747,7 @@ oaslit(Node *n, NodeList **init)
case OMAPLIT:
if(vmatch1(n->left, n->right))
goto no;
anylit(ctxt, n->right, n->left, init);
anylit(n->right, n->left, init);
break;
}
n->op = OEMPTY;

13
src/cmd/gc/subr.c
View File

@ -2593,19 +2593,6 @@ brrev(int a)
return a;
}
Node*
staticname(Type *t)
{
Node *n;
snprint(namebuf, sizeof(namebuf), "statictmp_%.4d", statuniqgen);
statuniqgen++;
n = newname(lookup(namebuf));
// n->readonly = 1;
addvar(n, t, PEXTERN);
return n;
}
/*
* return side effect-free appending side effects to init.
* result is assignable if n is.

4
src/cmd/gc/walk.c
View File

@ -1159,7 +1159,7 @@ walkexpr(Node **np, NodeList **init)
case OMAPLIT:
case OSTRUCTLIT:
nvar = makenewvar(n->type, init, &nstar);
anylit(0, n->left, nstar, init);
anylit(n->left, nstar, init);
n = nvar;
goto ret;
}
@ -1341,7 +1341,7 @@ walkexpr(Node **np, NodeList **init)
case OSTRUCTLIT:
nvar = nod(OXXX, N, N);
tempname(nvar, n->type);
anylit(0, n, nvar, init);
anylit(n, nvar, init);
n = nvar;
goto ret;