// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
* static initialization
*/
#include "go.h"
static NodeList *initlist;
static void init2(Node*, NodeList**);
static void init2list(NodeList*, NodeList**);
static void
init1(Node *n, NodeList **out)
{
NodeList *l;
if(n == N)
return;
init1(n->left, out);
init1(n->right, out);
for(l=n->list; l; l=l->next)
init1(l->n, out);
if(n->op != ONAME)
return;
switch(n->class) {
case PEXTERN:
case PFUNC:
break;
default:
if(isblank(n) && n->defn != N && !n->defn->initorder) {
n->defn->initorder = 1;
*out = list(*out, n->defn);
}
return;
}
if(n->initorder == 1)
return;
if(n->initorder == 2) {
if(n->class == PFUNC)
return;
// if there have already been errors printed,
// those errors probably confused us and
// there might not be a loop. let the user
// fix those first.
flusherrors();
if(nerrors > 0)
errorexit();
print("initialization loop:\n");
for(l=initlist;; l=l->next) {
if(l->next == nil)
break;
l->next->end = l;
}
for(; l; l=l->end)
print("\t%L %S refers to\n", l->n->lineno, l->n->sym);
print("\t%L %S\n", n->lineno, n->sym);
errorexit();
}
n->initorder = 2;
l = malloc(sizeof *l);
l->next = initlist;
l->n = n;
l->end = nil;
initlist = l;
// make sure that everything n depends on is initialized.
// n->defn is an assignment to n
if(n->defn != N) {
switch(n->defn->op) {
default:
goto bad;
case ODCLFUNC:
init2list(n->defn->nbody, out);
break;
case OAS:
if(n->defn->left != n)
goto bad;
n->defn->dodata = 1;
init1(n->defn->right, out);
if(debug['j'])
print("%S\n", n->sym);
*out = list(*out, n->defn);
break;
case OAS2FUNC:
case OAS2MAPR:
case OAS2DOTTYPE:
case OAS2RECV:
if(n->defn->initorder)
break;
n->defn->initorder = 1;
for(l=n->defn->rlist; l; l=l->next)
init1(l->n, out);
*out = list(*out, n->defn);
break;
}
}
l = initlist;
initlist = l->next;
if(l->n != n)
fatal("bad initlist");
free(l);
n->initorder = 1;
return;
bad:
dump("defn", n->defn);
fatal("init1: bad defn");
}
// recurse over n, doing init1 everywhere.
static void
init2(Node *n, NodeList **out)
{
if(n == N || n->initorder == 1)
return;
init1(n, out);
init2(n->left, out);
init2(n->right, out);
init2(n->ntest, out);
init2list(n->ninit, out);
init2list(n->list, out);
init2list(n->rlist, out);
init2list(n->nbody, out);
init2list(n->nelse, out);
}
static void
init2list(NodeList *l, NodeList **out)
{
for(; l; l=l->next)
init2(l->n, out);
}
static void
initreorder(NodeList *l, NodeList **out)
{
Node *n;
for(; l; l=l->next) {
n = l->n;
switch(n->op) {
case ODCLFUNC:
case ODCLCONST:
case ODCLTYPE:
continue;
}
initreorder(n->ninit, out);
n->ninit = nil;
init1(n, out);
}
}
NodeList*
initfix(NodeList *l)
{
NodeList *lout;
lout = nil;
initreorder(l, &lout);
return lout;
}
/*
* from here down is the walk analysis
* of composit literals.
* most of the work is to generate
* data statements for the constant
* 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 int
isliteral(Node *n)
{
if(n->op == OLITERAL)
if(n->val.ctype != CTNIL)
return 1;
return 0;
}
static int
simplename(Node *n)
{
if(n->op != ONAME)
goto no;
if(!n->addable)
goto no;
if(n->class & PHEAP)
goto no;
if(n->class == PPARAMREF)
goto no;
return 1;
no:
return 0;
}
static void
litas(Node *l, Node *r, NodeList **init)
{
Node *a;
a = nod(OAS, l, r);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
}
enum
{
MODEDYNAM = 1,
MODECONST = 2,
};
static int
getdyn(Node *n, int top)
{
NodeList *nl;
Node *value;
int mode;
mode = 0;
switch(n->op) {
default:
if(isliteral(n))
return MODECONST;
return MODEDYNAM;
case OARRAYLIT:
if(!top && n->type->bound < 0)
return MODEDYNAM;
case OSTRUCTLIT:
break;
}
for(nl=n->list; nl; nl=nl->next) {
value = nl->n->right;
mode |= getdyn(value, 0);
if(mode == (MODEDYNAM|MODECONST))
break;
}
return mode;
}
static void
structlit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *nl;
Node *index, *value;
for(nl=n->list; nl; nl=nl->next) {
r = nl->n;
if(r->op != OKEY)
fatal("structlit: rhs not OKEY: %N", r);
index = r->left;
value = r->right;
switch(value->op) {
case OARRAYLIT:
if(value->type->bound < 0) {
if(pass == 1 && ctxt != 0) {
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);
} else
if(pass == 3)
break;
continue;
}
a = nod(ODOT, var, newname(index->sym));
arraylit(ctxt, pass, value, a, init);
continue;
case OSTRUCTLIT:
a = nod(ODOT, var, newname(index->sym));
structlit(ctxt, pass, value, a, init);
continue;
}
if(isliteral(value)) {
if(pass == 2)
continue;
} else
if(pass == 1)
continue;
// build list of var.field = expr
a = nod(ODOT, var, newname(index->sym));
a = nod(OAS, a, value);
typecheck(&a, Etop);
walkexpr(&a, init);
if(pass == 1) {
if(a->op != OAS)
fatal("structlit: not as");
a->dodata = 2;
}
*init = list(*init, a);
}
}
static void
arraylit(int ctxt, int pass, Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *l;
Node *index, *value;
for(l=n->list; l; l=l->next) {
r = l->n;
if(r->op != OKEY)
fatal("arraylit: rhs not OKEY: %N", r);
index = r->left;
value = r->right;
switch(value->op) {
case OARRAYLIT:
if(value->type->bound < 0) {
if(pass == 1 && ctxt != 0) {
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);
} else
if(pass == 3)
break;
continue;
}
a = nod(OINDEX, var, index);
arraylit(ctxt, pass, value, a, init);
continue;
case OSTRUCTLIT:
a = nod(OINDEX, var, index);
structlit(ctxt, pass, value, a, init);
continue;
}
if(isliteral(index) && isliteral(value)) {
if(pass == 2)
continue;
} else
if(pass == 1)
continue;
// build list of var[index] = value
a = nod(OINDEX, var, index);
a = nod(OAS, a, value);
typecheck(&a, Etop);
walkexpr(&a, init); // add any assignments in r to top
if(pass == 1) {
if(a->op != OAS)
fatal("structlit: not as");
a->dodata = 2;
}
*init = list(*init, a);
}
}
static void
slicelit(int ctxt, Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *l;
Type *t;
Node *vstat, *vauto;
Node *index, *value;
int mode;
// make an array type
t = shallow(n->type);
t->bound = mpgetfix(n->right->val.u.xval);
t->width = 0;
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(OADDR, vstat, 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
// 2. assign (data statements) the constant part
// vstat = constpart{}
// 3. make an auto pointer to array and allocate heap to it
// var vauto *[...]t = new([...]t)
// 4. copy the static array to the auto array
// *vauto = vstat
// 5. assign slice of allocated heap to var
// var = [0:]*auto
// 6. for each dynamic part assign to the slice
// var[i] = dynamic part
//
// an optimization is done if there is no constant part
// 3. var vauto *[...]t = new([...]t)
// 5. var = [0:]*auto
// 6. var[i] = dynamic part
// if the literal contains constants,
// make static initialized array (1),(2)
vstat = N;
mode = getdyn(n, 1);
if(mode & MODECONST) {
vstat = staticname(t);
arraylit(ctxt, 1, n, vstat, init);
}
// make new auto *array (3 declare)
vauto = nod(OXXX, N, N);
tempname(vauto, ptrto(t));
// set auto to point at new heap (3 assign)
a = nod(ONEW, N, N);
a->list = list1(typenod(t));
a = nod(OAS, vauto, a);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
if(vstat != N) {
// copy static to heap (4)
a = nod(OIND, vauto, N);
a = nod(OAS, a, vstat);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
}
// make slice out of heap (5)
a = nod(OAS, var, vauto);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
// put dynamics into slice (6)
for(l=n->list; l; l=l->next) {
r = l->n;
if(r->op != OKEY)
fatal("slicelit: rhs not OKEY: %N", r);
index = r->left;
value = r->right;
a = nod(OINDEX, var, index);
a->etype = 1; // no bounds checking
// TODO need to check bounds?
switch(value->op) {
case OARRAYLIT:
if(value->type->bound < 0)
break;
arraylit(ctxt, 2, value, a, init);
continue;
case OSTRUCTLIT:
structlit(ctxt, 2, value, a, init);
continue;
}
if(isliteral(index) && isliteral(value))
continue;
// build list of var[c] = expr
a = nod(OAS, a, value);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
}
}
static void
maplit(int ctxt, Node *n, Node *var, NodeList **init)
{
Node *r, *a;
NodeList *l;
int nerr, b;
Type *t, *tk, *tv, *t1;
Node *vstat, *index, *value;
Sym *syma, *symb;
// make the map var
nerr = nerrors;
a = nod(OMAKE, N, N);
a->list = list1(typenod(n->type));
litas(var, a, init);
// count the initializers
b = 0;
for(l=n->list; l; l=l->next) {
r = l->n;
if(r->op != OKEY)
fatal("slicelit: rhs not OKEY: %N", r);
index = r->left;
value = r->right;
if(isliteral(index) && isliteral(value))
b++;
}
t = T;
if(b != 0) {
// build type [count]struct { a Tindex, b Tvalue }
t = n->type;
tk = t->down;
tv = t->type;
symb = lookup("b");
t = typ(TFIELD);
t->type = tv;
t->sym = symb;
syma = lookup("a");
t1 = t;
t = typ(TFIELD);
t->type = tk;
t->sym = syma;
t->down = t1;
t1 = t;
t = typ(TSTRUCT);
t->type = t1;
t1 = t;
t = typ(TARRAY);
t->bound = b;
t->type = t1;
dowidth(t);
// make and initialize static array
vstat = staticname(t);
b = 0;
for(l=n->list; l; l=l->next) {
r = l->n;
if(r->op != OKEY)
fatal("slicelit: rhs not OKEY: %N", r);
index = r->left;
value = r->right;
if(isliteral(index) && isliteral(value)) {
// build vstat[b].a = key;
a = nodintconst(b);
a = nod(OINDEX, vstat, a);
a = nod(ODOT, a, newname(syma));
a = nod(OAS, a, index);
typecheck(&a, Etop);
walkexpr(&a, init);
a->dodata = 2;
*init = list(*init, a);
// build vstat[b].b = value;
a = nodintconst(b);
a = nod(OINDEX, vstat, a);
a = nod(ODOT, a, newname(symb));
a = nod(OAS, a, value);
typecheck(&a, Etop);
walkexpr(&a, init);
a->dodata = 2;
*init = list(*init, a);
b++;
}
}
// loop adding structure elements to map
// for i = 0; i < len(vstat); i++ {
// map[vstat[i].a] = vstat[i].b
// }
index = nod(OXXX, N, N);
tempname(index, types[TINT]);
a = nod(OINDEX, vstat, index);
a->etype = 1; // no bounds checking
a = nod(ODOT, a, newname(symb));
r = nod(OINDEX, vstat, index);
r->etype = 1; // no bounds checking
r = nod(ODOT, r, newname(syma));
r = nod(OINDEX, var, r);
r = nod(OAS, r, a);
a = nod(OFOR, N, N);
a->nbody = list1(r);
a->ninit = list1(nod(OAS, index, nodintconst(0)));
a->ntest = nod(OLT, index, nodintconst(t->bound));
a->nincr = nod(OASOP, index, nodintconst(1));
a->nincr->etype = OADD;
typecheck(&a, Etop);
walkstmt(&a);
*init = list(*init, a);
}
// put in dynamic entries one-at-a-time
for(l=n->list; l; l=l->next) {
r = l->n;
if(r->op != OKEY)
fatal("slicelit: rhs not OKEY: %N", r);
index = r->left;
value = r->right;
if(isliteral(index) && isliteral(value))
continue;
// build list of var[c] = expr
a = nod(OINDEX, var, r->left);
a = nod(OAS, a, r->right);
typecheck(&a, Etop);
walkexpr(&a, init);
if(nerr != nerrors)
break;
*init = list(*init, a);
}
}
void
anylit(int ctxt, Node *n, Node *var, NodeList **init)
{
Type *t;
Node *a, *vstat;
t = n->type;
switch(n->op) {
default:
fatal("anylit: not lit");
case OSTRUCTLIT:
if(t->etype != TSTRUCT)
fatal("anylit: not struct");
if(simplename(var)) {
if(ctxt == 0) {
// lay out static data
vstat = staticname(t);
structlit(1, 1, n, vstat, init);
// copy static to var
a = nod(OAS, var, vstat);
typecheck(&a, Etop);
walkexpr(&a, 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);
break;
}
// initialize of not completely specified
if(count(n->list) < structcount(t)) {
a = nod(OAS, var, N);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
}
structlit(ctxt, 3, n, var, init);
break;
case OARRAYLIT:
if(t->etype != TARRAY)
fatal("anylit: not array");
if(t->bound < 0) {
slicelit(ctxt, n, var, init);
break;
}
if(simplename(var)) {
if(ctxt == 0) {
// lay out static data
vstat = staticname(t);
arraylit(1, 1, n, vstat, init);
// copy static to automatic
a = nod(OAS, var, vstat);
typecheck(&a, Etop);
walkexpr(&a, 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);
break;
}
// initialize of not completely specified
if(count(n->list) < t->bound) {
a = nod(OAS, var, N);
typecheck(&a, Etop);
walkexpr(&a, init);
*init = list(*init, a);
}
arraylit(ctxt, 3, n, var, init);
break;
case OMAPLIT:
if(t->etype != TMAP)
fatal("anylit: not map");
maplit(ctxt, n, var, init);
break;
}
}
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)
goto no;
if(!simplename(n->left))
goto no;
if(!eqtype(n->left->type, n->right->type))
goto no;
// 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:
goto no;
case OSTRUCTLIT:
case OARRAYLIT:
case OMAPLIT:
if(vmatch1(n->left, n->right))
goto no;
anylit(ctxt, n->right, n->left, init);
break;
}
n->op = OEMPTY;
return 1;
no:
// not a special composit literal assignment
return 0;
}
static int
getlit(Node *lit)
{
if(smallintconst(lit))
return mpgetfix(lit->val.u.xval);
return -1;
}
int
stataddr(Node *nam, Node *n)
{
int l;
if(n == N)
goto no;
switch(n->op) {
case ONAME:
*nam = *n;
return n->addable;
case ODOT:
if(!stataddr(nam, n->left))
break;
nam->xoffset += n->xoffset;
nam->type = n->type;
return 1;
case OINDEX:
if(n->left->type->bound < 0)
break;
if(!stataddr(nam, n->left))
break;
l = getlit(n->right);
if(l < 0)
break;
nam->xoffset += l*n->type->width;
nam->type = n->type;
return 1;
}
no:
return 0;
}
int
gen_as_init(Node *n)
{
Node *nr, *nl;
Node nam, nod1;
if(n->dodata == 0)
goto no;
nr = n->right;
nl = n->left;
if(nr == N) {
if(!stataddr(&nam, nl))
goto no;
if(nam.class != PEXTERN)
goto no;
goto yes;
}
if(nr->type == T || !eqtype(nl->type, nr->type))
goto no;
if(!stataddr(&nam, nl))
goto no;
if(nam.class != PEXTERN)
goto no;
switch(nr->op) {
default:
goto no;
case OCONVSLICE:
goto slice;
case OLITERAL:
break;
}
switch(nr->type->etype) {
default:
goto no;
case TBOOL:
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TINT64:
case TUINT64:
case TINT:
case TUINT:
case TUINTPTR:
case TPTR32:
case TPTR64:
case TFLOAT32:
case TFLOAT64:
case TFLOAT:
gused(N); // in case the data is the dest of a goto
gdata(&nam, nr, nr->type->width);
break;
case TCOMPLEX64:
case TCOMPLEX128:
case TCOMPLEX:
gused(N); // in case the data is the dest of a goto
gdatacomplex(&nam, nr->val.u.cval);
break;
case TSTRING:
gused(N); // in case the data is the dest of a goto
gdatastring(&nam, nr->val.u.sval);
break;
}
yes:
return 1;
slice:
gused(N); // in case the data is the dest of a goto
nr = n->right->left;
if(nr == N || nr->op != OADDR)
goto no;
nr = nr->left;
if(nr == N || nr->op != ONAME)
goto no;
// nr is the array being converted to a slice
if(nr->type == T || nr->type->etype != TARRAY || nr->type->bound < 0)
goto no;
nam.xoffset += Array_array;
gdata(&nam, n->right->left, types[tptr]->width);
nam.xoffset += Array_nel-Array_array;
nodconst(&nod1, types[TINT32], nr->type->bound);
gdata(&nam, &nod1, types[TINT32]->width);
nam.xoffset += Array_cap-Array_nel;
gdata(&nam, &nod1, types[TINT32]->width);
goto yes;
no:
if(n->dodata == 2) {
dump("\ngen_as_init", n);
fatal("gen_as_init couldnt make data statement");
}
return 0;
}
