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// 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.
#include <u.h>
#include <libc.h>
#include "go.h"
#define TUP(x,y) (((x)<<16)|(y))
static Val tocplx(Val);
static Val toflt(Val);
static Val tostr(Val);
static Val copyval(Val);
static void cmplxmpy(Mpcplx*, Mpcplx*);
static void cmplxdiv(Mpcplx*, Mpcplx*);
/*
* truncate float literal fv to 32-bit or 64-bit precision
* according to type; return truncated value.
*/
Mpflt*
truncfltlit(Mpflt *oldv, Type *t)
{
double d;
float f;
Mpflt *fv;
if(t == T)
return oldv;
fv = mal(sizeof *fv);
*fv = *oldv;
// convert large precision literal floating
// into limited precision (float64 or float32)
// botch -- this assumes that compiler fp
// has same precision as runtime fp
switch(t->etype) {
case TFLOAT64:
d = mpgetflt(fv);
mpmovecflt(fv, d);
break;
case TFLOAT32:
d = mpgetflt(fv);
f = d;
d = f;
mpmovecflt(fv, d);
break;
}
return fv;
}
/*
* convert n, if literal, to type t.
* implicit conversion.
*/
void
convlit(Node **np, Type *t)
{
convlit1(np, t, 0);
}
/*
* convert n, if literal, to type t.
* return a new node if necessary
* (if n is a named constant, can't edit n->type directly).
*/
void
convlit1(Node **np, Type *t, int explicit)
{
int ct, et;
Node *n, *nn;
n = *np;
if(n == N || t == T || n->type == T || isideal(t) || n->type == t)
return;
if(!explicit && !isideal(n->type))
return;
if(n->op == OLITERAL) {
nn = nod(OXXX, N, N);
*nn = *n;
n = nn;
*np = n;
}
switch(n->op) {
default:
if(n->type == idealbool) {
if(t->etype == TBOOL)
n->type = t;
else
n->type = types[TBOOL];
}
if(n->type->etype == TIDEAL) {
convlit(&n->left, t);
convlit(&n->right, t);
n->type = t;
}
return;
case OLITERAL:
// target is invalid type for a constant? leave alone.
if(!okforconst[t->etype] && n->type->etype != TNIL) {
defaultlit(&n, T);
*np = n;
return;
}
break;
case OLSH:
case ORSH:
convlit1(&n->left, t, explicit && isideal(n->left->type));
t = n->left->type;
if(t != T && t->etype == TIDEAL && n->val.ctype != CTINT)
n->val = toint(n->val);
if(t != T && !isint[t->etype]) {
yyerror("invalid operation: %N (shift of type %T)", n, t);
t = T;
}
n->type = t;
return;
case OCOMPLEX:
if(n->type->etype == TIDEAL) {
switch(t->etype) {
default:
// If trying to convert to non-complex type,
// leave as complex128 and let typechecker complain.
t = types[TCOMPLEX128];
//fallthrough
case TCOMPLEX128:
n->type = t;
convlit(&n->left, types[TFLOAT64]);
convlit(&n->right, types[TFLOAT64]);
break;
case TCOMPLEX64:
n->type = t;
convlit(&n->left, types[TFLOAT32]);
convlit(&n->right, types[TFLOAT32]);
break;
}
}
return;
}
// avoided repeated calculations, errors
if(eqtype(n->type, t))
return;
ct = consttype(n);
if(ct < 0)
goto bad;
et = t->etype;
if(et == TINTER) {
if(ct == CTNIL && n->type == types[TNIL]) {
n->type = t;
return;
}
defaultlit(np, T);
return;
}
switch(ct) {
default:
goto bad;
case CTNIL:
switch(et) {
default:
n->type = T;
goto bad;
case TSTRING:
// let normal conversion code handle it
return;
case TARRAY:
if(!isslice(t))
goto bad;
break;
case TPTR32:
case TPTR64:
case TINTER:
case TMAP:
case TCHAN:
case TFUNC:
case TUNSAFEPTR:
break;
case TUINTPTR:
// A nil literal may be converted to uintptr
// if it is an unsafe.Pointer
if(n->type->etype == TUNSAFEPTR) {
n->val.u.xval = mal(sizeof(*n->val.u.xval));
mpmovecfix(n->val.u.xval, 0);
n->val.ctype = CTINT;
} else
goto bad;
}
break;
case CTSTR:
case CTBOOL:
if(et != n->type->etype)
goto bad;
break;
case CTINT:
case CTRUNE:
case CTFLT:
case CTCPLX:
ct = n->val.ctype;
if(isint[et]) {
switch(ct) {
default:
goto bad;
case CTCPLX:
case CTFLT:
case CTRUNE:
n->val = toint(n->val);
// flowthrough
case CTINT:
overflow(n->val, t);
break;
}
} else
if(isfloat[et]) {
switch(ct) {
default:
goto bad;
case CTCPLX:
case CTINT:
case CTRUNE:
n->val = toflt(n->val);
// flowthrough
case CTFLT:
overflow(n->val, t);
n->val.u.fval = truncfltlit(n->val.u.fval, t);
break;
}
} else
if(iscomplex[et]) {
switch(ct) {
default:
goto bad;
case CTFLT:
case CTINT:
case CTRUNE:
n->val = tocplx(n->val);
break;
case CTCPLX:
overflow(n->val, t);
break;
}
} else
if(et == TSTRING && (ct == CTINT || ct == CTRUNE) && explicit)
n->val = tostr(n->val);
else
goto bad;
break;
}
n->type = t;
return;
bad:
if(!n->diag) {
if(!t->broke)
yyerror("cannot convert %N to type %T", n, t);
n->diag = 1;
}
if(isideal(n->type)) {
defaultlit(&n, T);
*np = n;
}
return;
}
static Val
copyval(Val v)
{
Mpint *i;
Mpflt *f;
Mpcplx *c;
switch(v.ctype) {
case CTINT:
case CTRUNE:
i = mal(sizeof(*i));
mpmovefixfix(i, v.u.xval);
v.u.xval = i;
break;
case CTFLT:
f = mal(sizeof(*f));
mpmovefltflt(f, v.u.fval);
v.u.fval = f;
break;
case CTCPLX:
c = mal(sizeof(*c));
mpmovefltflt(&c->real, &v.u.cval->real);
mpmovefltflt(&c->imag, &v.u.cval->imag);
v.u.cval = c;
break;
}
return v;
}
static Val
tocplx(Val v)
{
Mpcplx *c;
switch(v.ctype) {
case CTINT:
case CTRUNE:
c = mal(sizeof(*c));
mpmovefixflt(&c->real, v.u.xval);
mpmovecflt(&c->imag, 0.0);
v.ctype = CTCPLX;
v.u.cval = c;
break;
case CTFLT:
c = mal(sizeof(*c));
mpmovefltflt(&c->real, v.u.fval);
mpmovecflt(&c->imag, 0.0);
v.ctype = CTCPLX;
v.u.cval = c;
break;
}
return v;
}
static Val
toflt(Val v)
{
Mpflt *f;
switch(v.ctype) {
case CTINT:
case CTRUNE:
f = mal(sizeof(*f));
mpmovefixflt(f, v.u.xval);
v.ctype = CTFLT;
v.u.fval = f;
break;
case CTCPLX:
f = mal(sizeof(*f));
mpmovefltflt(f, &v.u.cval->real);
if(mpcmpfltc(&v.u.cval->imag, 0) != 0)
yyerror("constant %#F%+#Fi truncated to real", &v.u.cval->real, &v.u.cval->imag);
v.ctype = CTFLT;
v.u.fval = f;
break;
}
return v;
}
Val
toint(Val v)
{
Mpint *i;
switch(v.ctype) {
case CTRUNE:
v.ctype = CTINT;
break;
case CTFLT:
i = mal(sizeof(*i));
if(mpmovefltfix(i, v.u.fval) < 0)
yyerror("constant %#F truncated to integer", v.u.fval);
v.ctype = CTINT;
v.u.xval = i;
break;
case CTCPLX:
i = mal(sizeof(*i));
if(mpmovefltfix(i, &v.u.cval->real) < 0)
yyerror("constant %#F%+#Fi truncated to integer", &v.u.cval->real, &v.u.cval->imag);
if(mpcmpfltc(&v.u.cval->imag, 0) != 0)
yyerror("constant %#F%+#Fi truncated to real", &v.u.cval->real, &v.u.cval->imag);
v.ctype = CTINT;
v.u.xval = i;
break;
}
return v;
}
int
doesoverflow(Val v, Type *t)
{
switch(v.ctype) {
case CTINT:
case CTRUNE:
if(!isint[t->etype])
fatal("overflow: %T integer constant", t);
if(mpcmpfixfix(v.u.xval, minintval[t->etype]) < 0 ||
mpcmpfixfix(v.u.xval, maxintval[t->etype]) > 0)
return 1;
break;
case CTFLT:
if(!isfloat[t->etype])
fatal("overflow: %T floating-point constant", t);
if(mpcmpfltflt(v.u.fval, minfltval[t->etype]) <= 0 ||
mpcmpfltflt(v.u.fval, maxfltval[t->etype]) >= 0)
return 1;
break;
case CTCPLX:
if(!iscomplex[t->etype])
fatal("overflow: %T complex constant", t);
if(mpcmpfltflt(&v.u.cval->real, minfltval[t->etype]) <= 0 ||
mpcmpfltflt(&v.u.cval->real, maxfltval[t->etype]) >= 0 ||
mpcmpfltflt(&v.u.cval->imag, minfltval[t->etype]) <= 0 ||
mpcmpfltflt(&v.u.cval->imag, maxfltval[t->etype]) >= 0)
return 1;
break;
}
return 0;
}
void
overflow(Val v, Type *t)
{
// v has already been converted
// to appropriate form for t.
if(t == T || t->etype == TIDEAL)
return;
if(!doesoverflow(v, t))
return;
switch(v.ctype) {
case CTINT:
case CTRUNE:
yyerror("constant %B overflows %T", v.u.xval, t);
break;
case CTFLT:
yyerror("constant %#F overflows %T", v.u.fval, t);
break;
case CTCPLX:
yyerror("constant %#F overflows %T", v.u.fval, t);
break;
}
}
static Val
tostr(Val v)
{
Rune rune;
int l;
Strlit *s;
switch(v.ctype) {
case CTINT:
case CTRUNE:
if(mpcmpfixfix(v.u.xval, minintval[TINT]) < 0 ||
mpcmpfixfix(v.u.xval, maxintval[TINT]) > 0)
yyerror("overflow in int -> string");
rune = mpgetfix(v.u.xval);
l = runelen(rune);
s = mal(sizeof(*s)+l);
s->len = l;
runetochar((char*)s->s, &rune);
memset(&v, 0, sizeof v);
v.ctype = CTSTR;
v.u.sval = s;
break;
case CTFLT:
yyerror("no float -> string");
case CTNIL:
memset(&v, 0, sizeof v);
v.ctype = CTSTR;
v.u.sval = mal(sizeof *s);
break;
}
return v;
}
int
consttype(Node *n)
{
if(n == N || n->op != OLITERAL)
return -1;
return n->val.ctype;
}
int
isconst(Node *n, int ct)
{
int t;
t = consttype(n);
// If the caller is asking for CTINT, allow CTRUNE too.
// Makes life easier for back ends.
return t == ct || (ct == CTINT && t == CTRUNE);
}
static Node*
saveorig(Node *n)
{
Node *n1;
if(n == n->orig) {
// duplicate node for n->orig.
n1 = nod(OLITERAL, N, N);
n->orig = n1;
*n1 = *n;
}
return n->orig;
}
/*
* if n is constant, rewrite as OLITERAL node.
*/
void
evconst(Node *n)
{
Node *nl, *nr, *norig;
int32 len;
Strlit *str;
int wl, wr, lno, et;
Val v, rv;
Mpint b;
// pick off just the opcodes that can be
// constant evaluated.
switch(n->op) {
default:
return;
case OADD:
case OADDSTR:
case OAND:
case OANDAND:
case OANDNOT:
case OARRAYBYTESTR:
case OCOM:
case ODIV:
case OEQ:
case OGE:
case OGT:
case OLE:
case OLSH:
case OLT:
case OMINUS:
case OMOD:
case OMUL:
case ONE:
case ONOT:
case OOR:
case OOROR:
case OPLUS:
case ORSH:
case OSUB:
case OXOR:
break;
case OCONV:
if(n->type == T)
return;
if(!okforconst[n->type->etype] && n->type->etype != TNIL)
return;
break;
}
nl = n->left;
if(nl == N || nl->type == T)
return;
if(consttype(nl) < 0)
return;
wl = nl->type->etype;
if(isint[wl] || isfloat[wl] || iscomplex[wl])
wl = TIDEAL;
nr = n->right;
if(nr == N)
goto unary;
if(nr->type == T)
return;
if(consttype(nr) < 0)
return;
wr = nr->type->etype;
if(isint[wr] || isfloat[wr] || iscomplex[wr])
wr = TIDEAL;
// check for compatible general types (numeric, string, etc)
if(wl != wr)
goto illegal;
// check for compatible types.
switch(n->op) {
default:
// ideal const mixes with anything but otherwise must match.
if(nl->type->etype != TIDEAL) {
defaultlit(&nr, nl->type);
n->right = nr;
}
if(nr->type->etype != TIDEAL) {
defaultlit(&nl, nr->type);
n->left = nl;
}
if(nl->type->etype != nr->type->etype)
goto illegal;
break;
case OLSH:
case ORSH:
// right must be unsigned.
// left can be ideal.
defaultlit(&nr, types[TUINT]);
n->right = nr;
if(nr->type && (issigned[nr->type->etype] || !isint[nr->type->etype]))
goto illegal;
if(nl->val.ctype != CTRUNE)
nl->val = toint(nl->val);
nr->val = toint(nr->val);
break;
}
// copy numeric value to avoid modifying
// n->left, in case someone still refers to it (e.g. iota).
v = nl->val;
if(wl == TIDEAL)
v = copyval(v);
rv = nr->val;
// convert to common ideal
if(v.ctype == CTCPLX || rv.ctype == CTCPLX) {
v = tocplx(v);
rv = tocplx(rv);
}
if(v.ctype == CTFLT || rv.ctype == CTFLT) {
v = toflt(v);
rv = toflt(rv);
}
// Rune and int turns into rune.
if(v.ctype == CTRUNE && rv.ctype == CTINT)
rv.ctype = CTRUNE;
if(v.ctype == CTINT && rv.ctype == CTRUNE) {
if(n->op == OLSH || n->op == ORSH)
rv.ctype = CTINT;
else
v.ctype = CTRUNE;
}
if(v.ctype != rv.ctype) {
// Use of undefined name as constant?
if((v.ctype == 0 || rv.ctype == 0) && nerrors > 0)
return;
fatal("constant type mismatch %T(%d) %T(%d)", nl->type, v.ctype, nr->type, rv.ctype);
}
// run op
switch(TUP(n->op, v.ctype)) {
default:
illegal:
if(!n->diag) {
yyerror("illegal constant expression: %T %O %T",
nl->type, n->op, nr->type);
n->diag = 1;
}
return;
case TUP(OADD, CTINT):
case TUP(OADD, CTRUNE):
mpaddfixfix(v.u.xval, rv.u.xval, 0);
break;
case TUP(OSUB, CTINT):
case TUP(OSUB, CTRUNE):
mpsubfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OMUL, CTINT):
case TUP(OMUL, CTRUNE):
mpmulfixfix(v.u.xval, rv.u.xval);
break;
case TUP(ODIV, CTINT):
case TUP(ODIV, CTRUNE):
if(mpcmpfixc(rv.u.xval, 0) == 0) {
yyerror("division by zero");
mpmovecfix(v.u.xval, 1);
break;
}
mpdivfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OMOD, CTINT):
case TUP(OMOD, CTRUNE):
if(mpcmpfixc(rv.u.xval, 0) == 0) {
yyerror("division by zero");
mpmovecfix(v.u.xval, 1);
break;
}
mpmodfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OLSH, CTINT):
case TUP(OLSH, CTRUNE):
mplshfixfix(v.u.xval, rv.u.xval);
break;
case TUP(ORSH, CTINT):
case TUP(ORSH, CTRUNE):
mprshfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OOR, CTINT):
case TUP(OOR, CTRUNE):
mporfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OAND, CTINT):
case TUP(OAND, CTRUNE):
mpandfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OANDNOT, CTINT):
case TUP(OANDNOT, CTRUNE):
mpandnotfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OXOR, CTINT):
case TUP(OXOR, CTRUNE):
mpxorfixfix(v.u.xval, rv.u.xval);
break;
case TUP(OADD, CTFLT):
mpaddfltflt(v.u.fval, rv.u.fval);
break;
case TUP(OSUB, CTFLT):
mpsubfltflt(v.u.fval, rv.u.fval);
break;
case TUP(OMUL, CTFLT):
mpmulfltflt(v.u.fval, rv.u.fval);
break;
case TUP(ODIV, CTFLT):
if(mpcmpfltc(rv.u.fval, 0) == 0) {
yyerror("division by zero");
mpmovecflt(v.u.fval, 1.0);
break;
}
mpdivfltflt(v.u.fval, rv.u.fval);
break;
case TUP(OMOD, CTFLT):
// The default case above would print 'ideal % ideal',
// which is not quite an ideal error.
if(!n->diag) {
yyerror("illegal constant expression: floating-point %% operation");
n->diag = 1;
}
return;
case TUP(OADD, CTCPLX):
mpaddfltflt(&v.u.cval->real, &rv.u.cval->real);
mpaddfltflt(&v.u.cval->imag, &rv.u.cval->imag);
break;
case TUP(OSUB, CTCPLX):
mpsubfltflt(&v.u.cval->real, &rv.u.cval->real);
mpsubfltflt(&v.u.cval->imag, &rv.u.cval->imag);
break;
case TUP(OMUL, CTCPLX):
cmplxmpy(v.u.cval, rv.u.cval);
break;
case TUP(ODIV, CTCPLX):
if(mpcmpfltc(&rv.u.cval->real, 0) == 0 &&
mpcmpfltc(&rv.u.cval->imag, 0) == 0) {
yyerror("complex division by zero");
mpmovecflt(&rv.u.cval->real, 1.0);
mpmovecflt(&rv.u.cval->imag, 0.0);
break;
}
cmplxdiv(v.u.cval, rv.u.cval);
break;
case TUP(OEQ, CTNIL):
goto settrue;
case TUP(ONE, CTNIL):
goto setfalse;
case TUP(OEQ, CTINT):
case TUP(OEQ, CTRUNE):
if(mpcmpfixfix(v.u.xval, rv.u.xval) == 0)
goto settrue;
goto setfalse;
case TUP(ONE, CTINT):
case TUP(ONE, CTRUNE):
if(mpcmpfixfix(v.u.xval, rv.u.xval) != 0)
goto settrue;
goto setfalse;
case TUP(OLT, CTINT):
case TUP(OLT, CTRUNE):
if(mpcmpfixfix(v.u.xval, rv.u.xval) < 0)
goto settrue;
goto setfalse;
case TUP(OLE, CTINT):
case TUP(OLE, CTRUNE):
if(mpcmpfixfix(v.u.xval, rv.u.xval) <= 0)
goto settrue;
goto setfalse;
case TUP(OGE, CTINT):
case TUP(OGE, CTRUNE):
if(mpcmpfixfix(v.u.xval, rv.u.xval) >= 0)
goto settrue;
goto setfalse;
case TUP(OGT, CTINT):
case TUP(OGT, CTRUNE):
if(mpcmpfixfix(v.u.xval, rv.u.xval) > 0)
goto settrue;
goto setfalse;
case TUP(OEQ, CTFLT):
if(mpcmpfltflt(v.u.fval, rv.u.fval) == 0)
goto settrue;
goto setfalse;
case TUP(ONE, CTFLT):
if(mpcmpfltflt(v.u.fval, rv.u.fval) != 0)
goto settrue;
goto setfalse;
case TUP(OLT, CTFLT):
if(mpcmpfltflt(v.u.fval, rv.u.fval) < 0)
goto settrue;
goto setfalse;
case TUP(OLE, CTFLT):
if(mpcmpfltflt(v.u.fval, rv.u.fval) <= 0)
goto settrue;
goto setfalse;
case TUP(OGE, CTFLT):
if(mpcmpfltflt(v.u.fval, rv.u.fval) >= 0)
goto settrue;
goto setfalse;
case TUP(OGT, CTFLT):
if(mpcmpfltflt(v.u.fval, rv.u.fval) > 0)
goto settrue;
goto setfalse;
case TUP(OEQ, CTCPLX):
if(mpcmpfltflt(&v.u.cval->real, &rv.u.cval->real) == 0 &&
mpcmpfltflt(&v.u.cval->imag, &rv.u.cval->imag) == 0)
goto settrue;
goto setfalse;
case TUP(ONE, CTCPLX):
if(mpcmpfltflt(&v.u.cval->real, &rv.u.cval->real) != 0 ||
mpcmpfltflt(&v.u.cval->imag, &rv.u.cval->imag) != 0)
goto settrue;
goto setfalse;
case TUP(OEQ, CTSTR):
if(cmpslit(nl, nr) == 0)
goto settrue;
goto setfalse;
case TUP(ONE, CTSTR):
if(cmpslit(nl, nr) != 0)
goto settrue;
goto setfalse;
case TUP(OLT, CTSTR):
if(cmpslit(nl, nr) < 0)
goto settrue;
goto setfalse;
case TUP(OLE, CTSTR):
if(cmpslit(nl, nr) <= 0)
goto settrue;
goto setfalse;
case TUP(OGE, CTSTR):
if(cmpslit(nl, nr) >= 0l)
goto settrue;
goto setfalse;
case TUP(OGT, CTSTR):
if(cmpslit(nl, nr) > 0)
goto settrue;
goto setfalse;
case TUP(OADDSTR, CTSTR):
len = v.u.sval->len + rv.u.sval->len;
str = mal(sizeof(*str) + len);
str->len = len;
memcpy(str->s, v.u.sval->s, v.u.sval->len);
memcpy(str->s+v.u.sval->len, rv.u.sval->s, rv.u.sval->len);
str->len = len;
v.u.sval = str;
break;
case TUP(OOROR, CTBOOL):
if(v.u.bval || rv.u.bval)
goto settrue;
goto setfalse;
case TUP(OANDAND, CTBOOL):
if(v.u.bval && rv.u.bval)
goto settrue;
goto setfalse;
case TUP(OEQ, CTBOOL):
if(v.u.bval == rv.u.bval)
goto settrue;
goto setfalse;
case TUP(ONE, CTBOOL):
if(v.u.bval != rv.u.bval)
goto settrue;
goto setfalse;
}
goto ret;
unary:
// copy numeric value to avoid modifying
// nl, in case someone still refers to it (e.g. iota).
v = nl->val;
if(wl == TIDEAL)
v = copyval(v);
switch(TUP(n->op, v.ctype)) {
default:
if(!n->diag) {
yyerror("illegal constant expression %O %T", n->op, nl->type);
n->diag = 1;
}
return;
case TUP(OCONV, CTNIL):
case TUP(OARRAYBYTESTR, CTNIL):
if(n->type->etype == TSTRING) {
v = tostr(v);
nl->type = n->type;
break;
}
// fall through
case TUP(OCONV, CTINT):
case TUP(OCONV, CTRUNE):
case TUP(OCONV, CTFLT):
case TUP(OCONV, CTSTR):
convlit1(&nl, n->type, 1);
break;
case TUP(OPLUS, CTINT):
case TUP(OPLUS, CTRUNE):
break;
case TUP(OMINUS, CTINT):
case TUP(OMINUS, CTRUNE):
mpnegfix(v.u.xval);
break;
case TUP(OCOM, CTINT):
case TUP(OCOM, CTRUNE):
et = Txxx;
if(nl->type != T)
et = nl->type->etype;
// calculate the mask in b
// result will be (a ^ mask)
switch(et) {
default:
// signed guys change sign
mpmovecfix(&b, -1);
break;
case TUINT8:
case TUINT16:
case TUINT32:
case TUINT64:
case TUINT:
case TUINTPTR:
// unsigned guys invert their bits
mpmovefixfix(&b, maxintval[et]);
break;
}
mpxorfixfix(v.u.xval, &b);
break;
case TUP(OPLUS, CTFLT):
break;
case TUP(OMINUS, CTFLT):
mpnegflt(v.u.fval);
break;
case TUP(OPLUS, CTCPLX):
break;
case TUP(OMINUS, CTCPLX):
mpnegflt(&v.u.cval->real);
mpnegflt(&v.u.cval->imag);
break;
case TUP(ONOT, CTBOOL):
if(!v.u.bval)
goto settrue;
goto setfalse;
}
ret:
norig = saveorig(n);
*n = *nl;
// restore value of n->orig.
n->orig = norig;
n->val = v;
// check range.
lno = setlineno(n);
overflow(v, n->type);
lineno = lno;
// truncate precision for non-ideal float.
if(v.ctype == CTFLT && n->type->etype != TIDEAL)
n->val.u.fval = truncfltlit(v.u.fval, n->type);
return;
settrue:
norig = saveorig(n);
*n = *nodbool(1);
n->orig = norig;
return;
setfalse:
norig = saveorig(n);
*n = *nodbool(0);
n->orig = norig;
return;
}
Node*
nodlit(Val v)
{
Node *n;
n = nod(OLITERAL, N, N);
n->val = v;
switch(v.ctype) {
default:
fatal("nodlit ctype %d", v.ctype);
case CTSTR:
n->type = idealstring;
break;
case CTBOOL:
n->type = idealbool;
break;
case CTINT:
case CTRUNE:
case CTFLT:
case CTCPLX:
n->type = types[TIDEAL];
break;
case CTNIL:
n->type = types[TNIL];
break;
}
return n;
}
Node*
nodcplxlit(Val r, Val i)
{
Node *n;
Mpcplx *c;
r = toflt(r);
i = toflt(i);
c = mal(sizeof(*c));
n = nod(OLITERAL, N, N);
n->type = types[TIDEAL];
n->val.u.cval = c;
n->val.ctype = CTCPLX;
if(r.ctype != CTFLT || i.ctype != CTFLT)
fatal("nodcplxlit ctype %d/%d", r.ctype, i.ctype);
mpmovefltflt(&c->real, r.u.fval);
mpmovefltflt(&c->imag, i.u.fval);
return n;
}
// idealkind returns a constant kind like consttype
// but for an arbitrary "ideal" (untyped constant) expression.
static int
idealkind(Node *n)
{
int k1, k2;
if(n == N || !isideal(n->type))
return CTxxx;
switch(n->op) {
default:
return CTxxx;
case OLITERAL:
return n->val.ctype;
case OADD:
case OAND:
case OANDNOT:
case OCOM:
case ODIV:
case OMINUS:
case OMOD:
case OMUL:
case OSUB:
case OXOR:
case OOR:
case OPLUS:
// numeric kinds.
k1 = idealkind(n->left);
k2 = idealkind(n->right);
if(k1 > k2)
return k1;
else
return k2;
case OREAL:
case OIMAG:
return CTFLT;
case OCOMPLEX:
return CTCPLX;
case OADDSTR:
return CTSTR;
case OANDAND:
case OEQ:
case OGE:
case OGT:
case OLE:
case OLT:
case ONE:
case ONOT:
case OOROR:
case OCMPSTR:
case OCMPIFACE:
return CTBOOL;
case OLSH:
case ORSH:
// shifts (beware!).
return idealkind(n->left);
}
}
void
defaultlit(Node **np, Type *t)
{
int lno;
int ctype;
Node *n, *nn;
Type *t1;
n = *np;
if(n == N || !isideal(n->type))
return;
if(n->op == OLITERAL) {
nn = nod(OXXX, N, N);
*nn = *n;
n = nn;
*np = n;
}
lno = setlineno(n);
ctype = idealkind(n);
switch(ctype) {
default:
if(t != T) {
convlit(np, t);
return;
}
if(n->val.ctype == CTNIL) {
lineno = lno;
yyerror("use of untyped nil");
n->type = T;
break;
}
if(n->val.ctype == CTSTR) {
t1 = types[TSTRING];
convlit(np, t1);
break;
}
yyerror("defaultlit: unknown literal: %N", n);
break;
case CTxxx:
fatal("defaultlit: idealkind is CTxxx: %+N", n);
break;
case CTBOOL:
t1 = types[TBOOL];
if(t != T && t->etype == TBOOL)
t1 = t;
convlit(np, t1);
break;
case CTINT:
t1 = types[TINT];
goto num;
case CTRUNE:
t1 = runetype;
goto num;
case CTFLT:
t1 = types[TFLOAT64];
goto num;
case CTCPLX:
t1 = types[TCOMPLEX128];
goto num;
num:
if(t != T) {
if(isint[t->etype]) {
t1 = t;
n->val = toint(n->val);
}
else
if(isfloat[t->etype]) {
t1 = t;
n->val = toflt(n->val);
}
else
if(iscomplex[t->etype]) {
t1 = t;
n->val = tocplx(n->val);
}
}
overflow(n->val, t1);
convlit(np, t1);
break;
}
lineno = lno;
}
/*
* defaultlit on both nodes simultaneously;
* if they're both ideal going in they better
* get the same type going out.
* force means must assign concrete (non-ideal) type.
*/
void
defaultlit2(Node **lp, Node **rp, int force)
{
Node *l, *r;
int lkind, rkind;
l = *lp;
r = *rp;
if(l->type == T || r->type == T)
return;
if(!isideal(l->type)) {
convlit(rp, l->type);
return;
}
if(!isideal(r->type)) {
convlit(lp, r->type);
return;
}
if(!force)
return;
if(l->type->etype == TBOOL) {
convlit(lp, types[TBOOL]);
convlit(rp, types[TBOOL]);
}
lkind = idealkind(l);
rkind = idealkind(r);
if(lkind == CTCPLX || rkind == CTCPLX) {
convlit(lp, types[TCOMPLEX128]);
convlit(rp, types[TCOMPLEX128]);
return;
}
if(lkind == CTFLT || rkind == CTFLT) {
convlit(lp, types[TFLOAT64]);
convlit(rp, types[TFLOAT64]);
return;
}
if(lkind == CTRUNE || rkind == CTRUNE) {
convlit(lp, runetype);
convlit(rp, runetype);
return;
}
convlit(lp, types[TINT]);
convlit(rp, types[TINT]);
}
int
cmpslit(Node *l, Node *r)
{
int32 l1, l2, i, m;
uchar *s1, *s2;
l1 = l->val.u.sval->len;
l2 = r->val.u.sval->len;
s1 = (uchar*)l->val.u.sval->s;
s2 = (uchar*)r->val.u.sval->s;
m = l1;
if(l2 < m)
m = l2;
for(i=0; i<m; i++) {
if(s1[i] == s2[i])
continue;
if(s1[i] > s2[i])
return +1;
return -1;
}
if(l1 == l2)
return 0;
if(l1 > l2)
return +1;
return -1;
}
int
smallintconst(Node *n)
{
if(n->op == OLITERAL && isconst(n, CTINT) && n->type != T)
switch(simtype[n->type->etype]) {
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TBOOL:
case TPTR32:
return 1;
case TIDEAL:
case TINT64:
case TUINT64:
case TPTR64:
if(mpcmpfixfix(n->val.u.xval, minintval[TINT32]) < 0
|| mpcmpfixfix(n->val.u.xval, maxintval[TINT32]) > 0)
break;
return 1;
}
return 0;
}
long
nonnegconst(Node *n)
{
if(n->op == OLITERAL && n->type != T)
switch(simtype[n->type->etype]) {
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TINT64:
case TUINT64:
case TIDEAL:
// check negative and 2^31
if(mpcmpfixfix(n->val.u.xval, minintval[TUINT32]) < 0
|| mpcmpfixfix(n->val.u.xval, maxintval[TINT32]) > 0)
break;
return mpgetfix(n->val.u.xval);
}
return -1;
}
/*
* convert x to type et and back to int64
* for sign extension and truncation.
*/
static int64
iconv(int64 x, int et)
{
switch(et) {
case TINT8:
x = (int8)x;
break;
case TUINT8:
x = (uint8)x;
break;
case TINT16:
x = (int16)x;
break;
case TUINT16:
x = (uint64)x;
break;
case TINT32:
x = (int32)x;
break;
case TUINT32:
x = (uint32)x;
break;
case TINT64:
case TUINT64:
break;
}
return x;
}
/*
* convert constant val to type t; leave in con.
* for back end.
*/
void
convconst(Node *con, Type *t, Val *val)
{
int64 i;
int tt;
tt = simsimtype(t);
// copy the constant for conversion
nodconst(con, types[TINT8], 0);
con->type = t;
con->val = *val;
if(isint[tt]) {
con->val.ctype = CTINT;
con->val.u.xval = mal(sizeof *con->val.u.xval);
switch(val->ctype) {
default:
fatal("convconst ctype=%d %lT", val->ctype, t);
case CTINT:
case CTRUNE:
i = mpgetfix(val->u.xval);
break;
case CTBOOL:
i = val->u.bval;
break;
case CTNIL:
i = 0;
break;
}
i = iconv(i, tt);
mpmovecfix(con->val.u.xval, i);
return;
}
if(isfloat[tt]) {
con->val = toflt(con->val);
if(con->val.ctype != CTFLT)
fatal("convconst ctype=%d %T", con->val.ctype, t);
if(tt == TFLOAT32)
con->val.u.fval = truncfltlit(con->val.u.fval, t);
return;
}
if(iscomplex[tt]) {
con->val = tocplx(con->val);
if(tt == TCOMPLEX64) {
con->val.u.cval->real = *truncfltlit(&con->val.u.cval->real, types[TFLOAT32]);
con->val.u.cval->imag = *truncfltlit(&con->val.u.cval->imag, types[TFLOAT32]);
}
return;
}
fatal("convconst %lT constant", t);
}
// complex multiply v *= rv
// (a, b) * (c, d) = (a*c - b*d, b*c + a*d)
static void
cmplxmpy(Mpcplx *v, Mpcplx *rv)
{
Mpflt ac, bd, bc, ad;
mpmovefltflt(&ac, &v->real);
mpmulfltflt(&ac, &rv->real); // ac
mpmovefltflt(&bd, &v->imag);
mpmulfltflt(&bd, &rv->imag); // bd
mpmovefltflt(&bc, &v->imag);
mpmulfltflt(&bc, &rv->real); // bc
mpmovefltflt(&ad, &v->real);
mpmulfltflt(&ad, &rv->imag); // ad
mpmovefltflt(&v->real, &ac);
mpsubfltflt(&v->real, &bd); // ac-bd
mpmovefltflt(&v->imag, &bc);
mpaddfltflt(&v->imag, &ad); // bc+ad
}
// complex divide v /= rv
// (a, b) / (c, d) = ((a*c + b*d), (b*c - a*d))/(c*c + d*d)
static void
cmplxdiv(Mpcplx *v, Mpcplx *rv)
{
Mpflt ac, bd, bc, ad, cc_plus_dd;
mpmovefltflt(&cc_plus_dd, &rv->real);
mpmulfltflt(&cc_plus_dd, &rv->real); // cc
mpmovefltflt(&ac, &rv->imag);
mpmulfltflt(&ac, &rv->imag); // dd
mpaddfltflt(&cc_plus_dd, &ac); // cc+dd
mpmovefltflt(&ac, &v->real);
mpmulfltflt(&ac, &rv->real); // ac
mpmovefltflt(&bd, &v->imag);
mpmulfltflt(&bd, &rv->imag); // bd
mpmovefltflt(&bc, &v->imag);
mpmulfltflt(&bc, &rv->real); // bc
mpmovefltflt(&ad, &v->real);
mpmulfltflt(&ad, &rv->imag); // ad
mpmovefltflt(&v->real, &ac);
mpaddfltflt(&v->real, &bd); // ac+bd
mpdivfltflt(&v->real, &cc_plus_dd); // (ac+bd)/(cc+dd)
mpmovefltflt(&v->imag, &bc);
mpsubfltflt(&v->imag, &ad); // bc-ad
mpdivfltflt(&v->imag, &cc_plus_dd); // (bc+ad)/(cc+dd)
}
static int hascallchan(Node*);
// Is n a Go language constant (as opposed to a compile-time constant)?
// Expressions derived from nil, like string([]byte(nil)), while they
// may be known at compile time, are not Go language constants.
// Only called for expressions known to evaluated to compile-time
// constants.
int
isgoconst(Node *n)
{
Node *l;
Type *t;
if(n->orig != N)
n = n->orig;
switch(n->op) {
case OADD:
case OADDSTR:
case OAND:
case OANDAND:
case OANDNOT:
case OCOM:
case ODIV:
case OEQ:
case OGE:
case OGT:
case OLE:
case OLSH:
case OLT:
case OMINUS:
case OMOD:
case OMUL:
case ONE:
case ONOT:
case OOR:
case OOROR:
case OPLUS:
case ORSH:
case OSUB:
case OXOR:
case OCONV:
case OIOTA:
case OCOMPLEX:
case OREAL:
case OIMAG:
if(isgoconst(n->left) && (n->right == N || isgoconst(n->right)))
return 1;
break;
case OLEN:
case OCAP:
l = n->left;
if(isgoconst(l))
return 1;
// Special case: len/cap is constant when applied to array or
// pointer to array when the expression does not contain
// function calls or channel receive operations.
t = l->type;
if(t != T && isptr[t->etype])
t = t->type;
if(isfixedarray(t) && !hascallchan(l))
return 1;
break;
case OLITERAL:
if(n->val.ctype != CTNIL)
return 1;
break;
case ONAME:
l = n->sym->def;
if(l->op == OLITERAL && n->val.ctype != CTNIL)
return 1;
break;
case ONONAME:
if(n->sym->def != N && n->sym->def->op == OIOTA)
return 1;
break;
case OCALL:
// Only constant calls are unsafe.Alignof, Offsetof, and Sizeof.
l = n->left;
while(l->op == OPAREN)
l = l->left;
if(l->op != ONAME || l->sym->pkg != unsafepkg)
break;
if(strcmp(l->sym->name, "Alignof") == 0 ||
strcmp(l->sym->name, "Offsetof") == 0 ||
strcmp(l->sym->name, "Sizeof") == 0)
return 1;
break;
}
//dump("nonconst", n);
return 0;
}
static int
hascallchan(Node *n)
{
NodeList *l;
if(n == N)
return 0;
switch(n->op) {
case OCALL:
case OCALLFUNC:
case OCALLMETH:
case OCALLINTER:
case ORECV:
return 1;
}
if(hascallchan(n->left) ||
hascallchan(n->right))
return 1;
for(l=n->list; l; l=l->next)
if(hascallchan(l->n))
return 1;
for(l=n->rlist; l; l=l->next)
if(hascallchan(l->n))
return 1;
return 0;
}