/
cast.c
1676 lines (1510 loc) · 44.6 KB
/
cast.c
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// Copyright (c) 1999-2012 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.
#include <stdio.h>
#include <assert.h>
#include <string.h> // mem{set|cpy}()
#include "rmem.h"
#include "expression.h"
#include "mtype.h"
#include "utf.h"
#include "declaration.h"
#include "aggregate.h"
/* ==================== implicitCast ====================== */
/**************************************
* Do an implicit cast.
* Issue error if it can't be done.
*/
Expression *Expression::implicitCastTo(Scope *sc, Type *t)
{
//printf("implicitCastTo(%s) => %s\n", type->toChars(), t->toChars());
if (implicitConvTo(t))
{ TY tyfrom = type->toBasetype()->ty;
TY tyto = t->toBasetype()->ty;
if (global.params.warnings &&
Type::impcnvWarn[tyfrom][tyto] &&
op != TOKint64)
{
Expression *e = optimize(WANTflags | WANTvalue);
if (e->op == TOKint64)
return e->implicitCastTo(sc, t);
if (tyfrom == Tint32 &&
(op == TOKadd || op == TOKmin ||
op == TOKand || op == TOKor || op == TOKxor)
)
{
/* This is really only a semi-kludge fix,
* we really should look at the operands of op
* and see if they are narrower types.
* For example, b=b|b and b=b|7 and s=b+b should be allowed,
* but b=b|i should be an error.
*/
;
}
else
{
warning("implicit conversion of expression (%s) of type %s to %s can cause loss of data",
toChars(), type->toChars(), t->toChars());
}
}
#if DMDV2
if (match == MATCHconst && t == type->constOf())
{
Expression *e = copy();
e->type = t;
return e;
}
#endif
return castTo(sc, t);
}
Expression *e = optimize(WANTflags | WANTvalue);
if (e != this)
return e->implicitCastTo(sc, t);
#if 0
printf("ty = %d\n", type->ty);
print();
type->print();
printf("to:\n");
t->print();
printf("%p %p type: %s to: %s\n", type->deco, t->deco, type->deco, t->deco);
//printf("%p %p %p\n", type->nextOf()->arrayOf(), type, t);
fflush(stdout);
#endif
if (t->ty != Terror && type->ty != Terror)
{
if (!t->deco)
{ /* Can happen with:
* enum E { One }
* class A
* { static void fork(EDG dg) { dg(E.One); }
* alias void delegate(E) EDG;
* }
* Should eventually make it work.
*/
error("forward reference to type %s", t->toChars());
}
else if (t->reliesOnTident())
error("forward reference to type %s", t->reliesOnTident()->toChars());
error("cannot implicitly convert expression (%s) of type %s to %s",
toChars(), type->toChars(), t->toChars());
}
return new ErrorExp();
}
Expression *ErrorExp::implicitCastTo(Scope *sc, Type *t)
{
return this;
}
/*******************************************
* Return !=0 if we can implicitly convert this to type t.
* Don't do the actual cast.
*/
MATCH Expression::implicitConvTo(Type *t)
{
#if 0
printf("Expression::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
//static int nest; if (++nest == 10) halt();
if (t == Type::terror)
return MATCHnomatch;
if (!type)
{ error("%s is not an expression", toChars());
type = Type::terror;
}
if (t->ty == Tbit && isBit())
return MATCHconvert;
Expression *e = optimize(WANTvalue | WANTflags);
if (e != this)
{ //printf("optimzed to %s\n", e->toChars());
return e->implicitConvTo(t);
}
MATCH match = type->implicitConvTo(t);
if (match)
return match;
#if 0
Type *tb = t->toBasetype();
if (tb->ty == Tdelegate)
{ TypeDelegate *td = (TypeDelegate *)tb;
TypeFunction *tf = (TypeFunction *)td->nextOf();
if (!tf->varargs &&
!(tf->arguments && tf->arguments->dim)
)
{
match = type->implicitConvTo(tf->nextOf());
if (match)
return match;
if (tf->nextOf()->toBasetype()->ty == Tvoid)
return MATCHconvert;
}
}
#endif
return MATCHnomatch;
}
MATCH IntegerExp::implicitConvTo(Type *t)
{
#if 0
printf("IntegerExp::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
if (type->equals(t))
return MATCHexact;
enum TY ty = type->toBasetype()->ty;
enum TY toty = t->toBasetype()->ty;
enum TY oldty = ty;
if (type->implicitConvTo(t) == MATCHnomatch && t->ty == Tenum)
{
return MATCHnomatch;
}
switch (ty)
{
case Tbit:
case Tbool:
value &= 1;
ty = Tint32;
break;
case Tint8:
value = (signed char)value;
ty = Tint32;
break;
case Tchar:
case Tuns8:
value &= 0xFF;
ty = Tint32;
break;
case Tint16:
value = (short)value;
ty = Tint32;
break;
case Tuns16:
case Twchar:
value &= 0xFFFF;
ty = Tint32;
break;
case Tint32:
value = (int)value;
break;
case Tuns32:
case Tdchar:
value &= 0xFFFFFFFF;
ty = Tuns32;
break;
default:
break;
}
// Only allow conversion if no change in value
switch (toty)
{
case Tbit:
case Tbool:
if ((value & 1) != value)
goto Lno;
goto Lyes;
case Tint8:
if ((signed char)value != value)
goto Lno;
goto Lyes;
case Tchar:
if ((oldty == Twchar || oldty == Tdchar) && value > 0x7F)
goto Lno;
case Tuns8:
//printf("value = %llu %llu\n", (dinteger_t)(unsigned char)value, value);
if ((unsigned char)value != value)
goto Lno;
goto Lyes;
case Tint16:
if ((short)value != value)
goto Lno;
goto Lyes;
case Twchar:
if (oldty == Tdchar && value > 0xD7FF && value < 0xE000)
goto Lno;
case Tuns16:
if ((unsigned short)value != value)
goto Lno;
goto Lyes;
case Tint32:
if (ty == Tuns32)
{
}
else if ((int)value != value)
goto Lno;
goto Lyes;
case Tuns32:
if (ty == Tint32)
{
}
else if ((unsigned)value != value)
goto Lno;
goto Lyes;
case Tdchar:
if (value > 0x10FFFFUL)
goto Lno;
goto Lyes;
case Tfloat32:
{
volatile float f;
if (type->isunsigned())
{
f = (float)value;
if (f != value)
goto Lno;
}
else
{
f = (float)(long long)value;
if (f != (long long)value)
goto Lno;
}
goto Lyes;
}
case Tfloat64:
{
volatile double f;
if (type->isunsigned())
{
f = (double)value;
if (f != value)
goto Lno;
}
else
{
f = (double)(long long)value;
if (f != (long long)value)
goto Lno;
}
goto Lyes;
}
case Tfloat80:
{
volatile long double f;
if (type->isunsigned())
{
f = (long double)value;
if (f != value)
goto Lno;
}
else
{
f = (long double)(long long)value;
if (f != (long long)value)
goto Lno;
}
goto Lyes;
}
}
return Expression::implicitConvTo(t);
Lyes:
//printf("MATCHconvert\n");
return MATCHconvert;
Lno:
//printf("MATCHnomatch\n");
return MATCHnomatch;
}
MATCH NullExp::implicitConvTo(Type *t)
{
#if 0
printf("NullExp::implicitConvTo(this=%s, type=%s, t=%s, committed = %d)\n",
toChars(), type->toChars(), t->toChars(), committed);
#endif
if (this->type->equals(t))
return MATCHexact;
// NULL implicitly converts to any pointer type or dynamic array
if (type->ty == Tpointer && type->next->ty == Tvoid)
{
if (t->ty == Ttypedef)
t = ((TypeTypedef *)t)->sym->basetype;
if (t->ty == Tpointer || t->ty == Tarray ||
t->ty == Taarray || t->ty == Tclass ||
t->ty == Tdelegate)
return committed ? MATCHconvert : MATCHexact;
}
return Expression::implicitConvTo(t);
}
#if DMDV2
MATCH StructLiteralExp::implicitConvTo(Type *t)
{
#if 0
printf("StructLiteralExp::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
MATCH m = Expression::implicitConvTo(t);
if (m != MATCHnomatch)
return m;
if (type->ty == t->ty && type->ty == Tstruct &&
((TypeStruct *)type)->sym == ((TypeStruct *)t)->sym)
{
m = MATCHconst;
for (size_t i = 0; i < elements->dim; i++)
{ Expression *e = (*elements)[i];
Type *te = e->type;
if (t->mod == 0)
te = te->mutableOf();
else
{ assert(t->mod == MODimmutable);
te = te->invariantOf();
}
MATCH m2 = e->implicitConvTo(te);
//printf("\t%s => %s, match = %d\n", e->toChars(), te->toChars(), m2);
if (m2 < m)
m = m2;
}
}
return m;
}
#endif
MATCH StringExp::implicitConvTo(Type *t)
{
#if 0
printf("StringExp::implicitConvTo(this=%s, committed=%d, type=%s, t=%s)\n",
toChars(), committed, type->toChars(), t->toChars());
#endif
if (!committed && t->ty == Tpointer && t->next->ty == Tvoid)
{
return MATCHnomatch;
}
if (!committed)
if (type->ty == Tsarray || type->ty == Tarray || type->ty == Tpointer)
{
if (type->next->ty == Tchar)
{
switch (t->ty)
{
case Tsarray:
if (type->ty == Tsarray &&
((TypeSArray *)type)->dim->toInteger() !=
((TypeSArray *)t)->dim->toInteger())
return MATCHnomatch;
goto L1;
case Tarray:
goto L1;
case Tpointer:
L1:
if (t->next->ty == Tchar)
return MATCHexact;
else if (!committed)
{ if (t->next->ty == Twchar)
return MATCHexact;
else if (t->next->ty == Tdchar)
return MATCHexact;
}
break;
}
}
}
return Expression::implicitConvTo(t);
#if 0
m = (MATCH)type->implicitConvTo(t);
if (m)
{
return m;
}
return MATCHnomatch;
#endif
}
MATCH ArrayLiteralExp::implicitConvTo(Type *t)
{ MATCH result = MATCHexact;
#if 0
printf("ArrayLiteralExp::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
Type *typeb = type->toBasetype();
Type *tb = t->toBasetype();
if ((tb->ty == Tarray || tb->ty == Tsarray) &&
(typeb->ty == Tarray || typeb->ty == Tsarray))
{
if (tb->ty == Tsarray)
{ TypeSArray *tsa = (TypeSArray *)tb;
if (elements->dim != tsa->dim->toInteger())
result = MATCHnomatch;
}
if (!elements->dim && typeb->nextOf()->toBasetype()->ty != Tvoid)
result = MATCHnomatch;
Type *telement = tb->nextOf();
for (size_t i = 0; i < elements->dim; i++)
{ Expression *e = (*elements)[i];
if (result == MATCHnomatch)
break; // no need to check for worse
MATCH m = (MATCH)e->implicitConvTo(telement);
if (m < result)
result = m; // remember worst match
}
if (!result)
result = type->implicitConvTo(t);
return result;
}
#if DMDV2
else if (tb->ty == Tvector &&
(typeb->ty == Tarray || typeb->ty == Tsarray))
{
// Convert array literal to vector type
TypeVector *tv = (TypeVector *)tb;
TypeSArray *tbase = (TypeSArray *)tv->basetype;
assert(tbase->ty == Tsarray);
if (elements->dim != tbase->dim->toInteger())
return MATCHnomatch;
Type *telement = tv->elementType();
for (size_t i = 0; i < elements->dim; i++)
{ Expression *e = (*elements)[i];
MATCH m = (MATCH)e->implicitConvTo(telement);
if (m < result)
result = m; // remember worst match
if (result == MATCHnomatch)
break; // no need to check for worse
}
return result;
}
#endif
else
return Expression::implicitConvTo(t);
}
MATCH AssocArrayLiteralExp::implicitConvTo(Type *t)
{ MATCH result = MATCHexact;
Type *typeb = type->toBasetype();
Type *tb = t->toBasetype();
if (tb->ty == Taarray && typeb->ty == Taarray)
{
for (size_t i = 0; i < keys->dim; i++)
{ Expression *e = (Expression *)keys->data[i];
MATCH m = (MATCH)e->implicitConvTo(((TypeAArray *)tb)->key);
if (m < result)
result = m; // remember worst match
if (result == MATCHnomatch)
break; // no need to check for worse
e = (Expression *)values->data[i];
m = (MATCH)e->implicitConvTo(tb->nextOf());
if (m < result)
result = m; // remember worst match
if (result == MATCHnomatch)
break; // no need to check for worse
}
return result;
}
else
return Expression::implicitConvTo(t);
}
MATCH AddrExp::implicitConvTo(Type *t)
{
#if 0
printf("AddrExp::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
MATCH result;
result = type->implicitConvTo(t);
//printf("\tresult = %d\n", result);
if (result == MATCHnomatch)
{
// Look for pointers to functions where the functions are overloaded.
VarExp *ve;
FuncDeclaration *f;
t = t->toBasetype();
if (type->ty == Tpointer && type->next->ty == Tfunction &&
t->ty == Tpointer && t->next->ty == Tfunction &&
e1->op == TOKvar)
{
ve = (VarExp *)e1;
f = ve->var->isFuncDeclaration();
if (f && f->overloadExactMatch(t->next, m))
result = MATCHexact;
}
}
//printf("\tresult = %d\n", result);
return result;
}
MATCH SymOffExp::implicitConvTo(Type *t)
{
#if 0
printf("SymOffExp::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
MATCH result;
result = type->implicitConvTo(t);
//printf("\tresult = %d\n", result);
if (result == MATCHnomatch)
{
// Look for pointers to functions where the functions are overloaded.
FuncDeclaration *f;
t = t->toBasetype();
if (type->ty == Tpointer && type->next->ty == Tfunction &&
t->ty == Tpointer && t->next->ty == Tfunction)
{
f = var->isFuncDeclaration();
if (f && f->overloadExactMatch(t->next, m))
result = MATCHexact;
}
}
//printf("\tresult = %d\n", result);
return result;
}
MATCH DelegateExp::implicitConvTo(Type *t)
{
#if 0
printf("DelegateExp::implicitConvTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
MATCH result;
result = type->implicitConvTo(t);
if (result == 0)
{
// Look for pointers to functions where the functions are overloaded.
t = t->toBasetype();
if (type->ty == Tdelegate && type->nextOf()->ty == Tfunction &&
t->ty == Tdelegate && t->nextOf()->ty == Tfunction)
{
if (func && func->overloadExactMatch(t->nextOf(), m))
result = MATCHexact;
}
}
return result;
}
MATCH CondExp::implicitConvTo(Type *t)
{
MATCH m1;
MATCH m2;
m1 = e1->implicitConvTo(t);
m2 = e2->implicitConvTo(t);
// Pick the worst match
return (m1 < m2) ? m1 : m2;
}
/* ==================== castTo ====================== */
/**************************************
* Do an explicit cast.
*/
Expression *Expression::castTo(Scope *sc, Type *t)
{
//printf("Expression::castTo(this=%s, t=%s)\n", toChars(), t->toChars());
#if 0
printf("Expression::castTo(this=%s, type=%s, t=%s)\n",
toChars(), type->toChars(), t->toChars());
#endif
if (type == t)
return this;
Expression *e = this;
Type *tb = t->toBasetype();
Type *typeb = type->toBasetype();
if (tb != typeb)
{
// Do (type *) cast of (type [dim])
if (tb->ty == Tpointer &&
typeb->ty == Tsarray
)
{
//printf("Converting [dim] to *\n");
if (typeb->size(loc) == 0)
e = new NullExp(loc);
else
e = new AddrExp(loc, e);
}
#if 0
else if (tb->ty == Tdelegate && type->ty != Tdelegate)
{
TypeDelegate *td = (TypeDelegate *)tb;
TypeFunction *tf = (TypeFunction *)td->nextOf();
return toDelegate(sc, tf->nextOf());
}
#endif
else
{
e = new CastExp(loc, e, tb);
}
}
else
{
e = e->copy(); // because of COW for assignment to e->type
}
assert(e != this);
e->type = t;
//printf("Returning: %s\n", e->toChars());
return e;
}
Expression *ErrorExp::castTo(Scope *sc, Type *t)
{
return this;
}
Expression *RealExp::castTo(Scope *sc, Type *t)
{ Expression *e = this;
if (type != t)
{
if ((type->isreal() && t->isreal()) ||
(type->isimaginary() && t->isimaginary())
)
{ e = copy();
e->type = t;
}
else
e = Expression::castTo(sc, t);
}
return e;
}
Expression *ComplexExp::castTo(Scope *sc, Type *t)
{ Expression *e = this;
if (type != t)
{
if (type->iscomplex() && t->iscomplex())
{ e = copy();
e->type = t;
}
else
e = Expression::castTo(sc, t);
}
return e;
}
Expression *NullExp::castTo(Scope *sc, Type *t)
{ NullExp *e;
Type *tb;
//printf("NullExp::castTo(t = %p)\n", t);
if (type == t)
{
committed = 1;
return this;
}
e = (NullExp *)copy();
e->committed = 1;
tb = t->toBasetype();
e->type = type->toBasetype();
if (tb != e->type)
{
// NULL implicitly converts to any pointer type or dynamic array
if (e->type->ty == Tpointer && e->type->nextOf()->ty == Tvoid &&
(tb->ty == Tpointer || tb->ty == Tarray || tb->ty == Taarray ||
tb->ty == Tdelegate))
{
#if 0
if (tb->ty == Tdelegate)
{ TypeDelegate *td = (TypeDelegate *)tb;
TypeFunction *tf = (TypeFunction *)td->nextOf();
if (!tf->varargs &&
!(tf->arguments && tf->arguments->dim)
)
{
return Expression::castTo(sc, t);
}
}
#endif
}
else
{
return e->Expression::castTo(sc, t);
}
}
e->type = t;
return e;
}
Expression *StringExp::castTo(Scope *sc, Type *t)
{
/* This follows copy-on-write; any changes to 'this'
* will result in a copy.
* The this->string member is considered immutable.
*/
int copied = 0;
//printf("StringExp::castTo(t = %s), '%s' committed = %d\n", t->toChars(), toChars(), committed);
if (!committed && t->ty == Tpointer && t->nextOf()->ty == Tvoid)
{
error("cannot convert string literal to void*");
return new ErrorExp();
}
StringExp *se = this;
if (!committed)
{ se = (StringExp *)copy();
se->committed = 1;
copied = 1;
}
if (type == t)
{
return se;
}
Type *tb = t->toBasetype();
//printf("\ttype = %s\n", type->toChars());
if (tb->ty == Tdelegate && type->toBasetype()->ty != Tdelegate)
return Expression::castTo(sc, t);
Type *typeb = type->toBasetype();
if (typeb == tb)
{
if (!copied)
{ se = (StringExp *)copy();
copied = 1;
}
se->type = t;
return se;
}
if (tb->ty != Tsarray && tb->ty != Tarray && tb->ty != Tpointer)
{ if (!copied)
{ se = (StringExp *)copy();
copied = 1;
}
goto Lcast;
}
if (typeb->ty != Tsarray && typeb->ty != Tarray && typeb->ty != Tpointer)
{ if (!copied)
{ se = (StringExp *)copy();
copied = 1;
}
goto Lcast;
}
if (typeb->nextOf()->size() == tb->nextOf()->size())
{
if (!copied)
{ se = (StringExp *)copy();
copied = 1;
}
if (tb->ty == Tsarray)
goto L2; // handle possible change in static array dimension
se->type = t;
return se;
}
if (committed)
goto Lcast;
#define X(tf,tt) ((tf) * 256 + (tt))
{
OutBuffer buffer;
size_t newlen = 0;
int tfty = typeb->nextOf()->toBasetype()->ty;
int ttty = tb->nextOf()->toBasetype()->ty;
switch (X(tfty, ttty))
{
case X(Tchar, Tchar):
case X(Twchar,Twchar):
case X(Tdchar,Tdchar):
break;
case X(Tchar, Twchar):
for (size_t u = 0; u < len;)
{ unsigned c;
const char *p = utf_decodeChar((unsigned char *)se->string, len, &u, &c);
if (p)
error("%s", p);
else
buffer.writeUTF16(c);
}
newlen = buffer.offset / 2;
buffer.writeUTF16(0);
goto L1;
case X(Tchar, Tdchar):
for (size_t u = 0; u < len;)
{ unsigned c;
const char *p = utf_decodeChar((unsigned char *)se->string, len, &u, &c);
if (p)
error("%s", p);
buffer.write4(c);
newlen++;
}
buffer.write4(0);
goto L1;
case X(Twchar,Tchar):
for (size_t u = 0; u < len;)
{ unsigned c;
const char *p = utf_decodeWchar((unsigned short *)se->string, len, &u, &c);
if (p)
error("%s", p);
else
buffer.writeUTF8(c);
}
newlen = buffer.offset;
buffer.writeUTF8(0);
goto L1;
case X(Twchar,Tdchar):
for (size_t u = 0; u < len;)
{ unsigned c;
const char *p = utf_decodeWchar((unsigned short *)se->string, len, &u, &c);
if (p)
error("%s", p);
buffer.write4(c);
newlen++;
}
buffer.write4(0);
goto L1;
case X(Tdchar,Tchar):
for (size_t u = 0; u < len; u++)
{
unsigned c = ((unsigned *)se->string)[u];
if (!utf_isValidDchar(c))
error("invalid UCS-32 char \\U%08x", c);
else
buffer.writeUTF8(c);
newlen++;
}
newlen = buffer.offset;
buffer.writeUTF8(0);
goto L1;
case X(Tdchar,Twchar):
for (size_t u = 0; u < len; u++)
{
unsigned c = ((unsigned *)se->string)[u];
if (!utf_isValidDchar(c))
error("invalid UCS-32 char \\U%08x", c);
else
buffer.writeUTF16(c);
newlen++;
}
newlen = buffer.offset / 2;
buffer.writeUTF16(0);
goto L1;
L1:
if (!copied)
{ se = (StringExp *)copy();
copied = 1;
}
se->string = buffer.extractData();
se->len = newlen;
{
d_uns64 szx = tb->nextOf()->size();
assert(szx <= 255);
se->sz = (unsigned char)szx;
}
break;
default:
assert(typeb->nextOf()->size() != tb->nextOf()->size());
goto Lcast;
}
}
#undef X
L2:
assert(copied);
// See if need to truncate or extend the literal
if (tb->ty == Tsarray)
{
dinteger_t dim2 = ((TypeSArray *)tb)->dim->toInteger();
//printf("dim from = %d, to = %d\n", (int)se->len, (int)dim2);
// Changing dimensions
if (dim2 != se->len)
{
// Copy when changing the string literal
unsigned newsz = se->sz;
void *s;
int d;
d = (dim2 < se->len) ? dim2 : se->len;
s = (unsigned char *)mem.malloc((dim2 + 1) * newsz);
memcpy(s, se->string, d * newsz);
// Extend with 0, add terminating 0
memset((char *)s + d * newsz, 0, (dim2 + 1 - d) * newsz);
se->string = s;
se->len = dim2;
}
}
se->type = t;
return se;
Lcast:
Expression *e = new CastExp(loc, se, t);
e->type = t; // so semantic() won't be run on e
return e;
}