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opover.c
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opover.c
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/* Compiler implementation of the D programming language
* Copyright (c) 1999-2014 by Digital Mars
* All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/opover.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <string.h> // memset()
#include "rmem.h"
#include "mtype.h"
#include "init.h"
#include "expression.h"
#include "statement.h"
#include "scope.h"
#include "id.h"
#include "declaration.h"
#include "aggregate.h"
#include "template.h"
#include "tokens.h"
static Dsymbol *inferApplyArgTypesX(Expression *ethis, FuncDeclaration *fstart, Parameters *parameters);
static int inferApplyArgTypesY(TypeFunction *tf, Parameters *parameters, int flags = 0);
Expression *compare_overload(BinExp *e, Scope *sc, Identifier *id);
/******************************** Expression **************************/
/***********************************
* Determine if operands of binary op can be reversed
* to fit operator overload.
*/
bool isCommutative(TOK op)
{
switch (op)
{
case TOKadd:
case TOKmul:
case TOKand:
case TOKor:
case TOKxor:
// EqualExp
case TOKequal:
case TOKnotequal:
// CmpExp
case TOKlt:
case TOKle:
case TOKgt:
case TOKge:
case TOKunord:
case TOKlg:
case TOKleg:
case TOKule:
case TOKul:
case TOKuge:
case TOKug:
case TOKue:
return true;
default:
break;
}
return false;
}
/***********************************
* Get Identifier for operator overload.
*/
static Identifier *opId(Expression *e)
{
class OpIdVisitor : public Visitor
{
public:
Identifier *id;
void visit(Expression *e) { assert(0); }
void visit(UAddExp *e) { id = Id::uadd; }
void visit(NegExp *e) { id = Id::neg; }
void visit(ComExp *e) { id = Id::com; }
void visit(CastExp *e) { id = Id::cast; }
void visit(InExp *e) { id = Id::opIn; }
void visit(PostExp *e) { id = (e->op == TOKplusplus) ? Id::postinc : Id::postdec; }
void visit(AddExp *e) { id = Id::add; }
void visit(MinExp *e) { id = Id::sub; }
void visit(MulExp *e) { id = Id::mul; }
void visit(DivExp *e) { id = Id::div; }
void visit(ModExp *e) { id = Id::mod; }
void visit(PowExp *e) { id = Id::pow; }
void visit(ShlExp *e) { id = Id::shl; }
void visit(ShrExp *e) { id = Id::shr; }
void visit(UshrExp *e) { id = Id::ushr; }
void visit(AndExp *e) { id = Id::iand; }
void visit(OrExp *e) { id = Id::ior; }
void visit(XorExp *e) { id = Id::ixor; }
void visit(CatExp *e) { id = Id::cat; }
void visit(AssignExp *e) { id = Id::assign; }
void visit(AddAssignExp *e) { id = Id::addass; }
void visit(MinAssignExp *e) { id = Id::subass; }
void visit(MulAssignExp *e) { id = Id::mulass; }
void visit(DivAssignExp *e) { id = Id::divass; }
void visit(ModAssignExp *e) { id = Id::modass; }
void visit(AndAssignExp *e) { id = Id::andass; }
void visit(OrAssignExp *e) { id = Id::orass; }
void visit(XorAssignExp *e) { id = Id::xorass; }
void visit(ShlAssignExp *e) { id = Id::shlass; }
void visit(ShrAssignExp *e) { id = Id::shrass; }
void visit(UshrAssignExp *e) { id = Id::ushrass; }
void visit(CatAssignExp *e) { id = Id::catass; }
void visit(PowAssignExp *e) { id = Id::powass; }
void visit(EqualExp *e) { id = Id::eq; }
void visit(CmpExp *e) { id = Id::cmp; }
void visit(ArrayExp *e) { id = Id::index; }
void visit(PtrExp *e) { id = Id::opStar; }
};
OpIdVisitor v;
e->accept(&v);
return v.id;
}
/***********************************
* Get Identifier for reverse operator overload,
* NULL if not supported for this operator.
*/
static Identifier *opId_r(Expression *e)
{
class OpIdRVisitor : public Visitor
{
public:
Identifier *id;
void visit(Expression *e) { id = NULL; }
void visit(InExp *e) { id = Id::opIn_r; }
void visit(AddExp *e) { id = Id::add_r; }
void visit(MinExp *e) { id = Id::sub_r; }
void visit(MulExp *e) { id = Id::mul_r; }
void visit(DivExp *e) { id = Id::div_r; }
void visit(ModExp *e) { id = Id::mod_r; }
void visit(PowExp *e) { id = Id::pow_r; }
void visit(ShlExp *e) { id = Id::shl_r; }
void visit(ShrExp *e) { id = Id::shr_r; }
void visit(UshrExp *e) { id = Id::ushr_r; }
void visit(AndExp *e) { id = Id::iand_r; }
void visit(OrExp *e) { id = Id::ior_r; }
void visit(XorExp *e) { id = Id::ixor_r; }
void visit(CatExp *e) { id = Id::cat_r; }
};
OpIdRVisitor v;
e->accept(&v);
return v.id;
}
/************************************
* If type is a class or struct, return the symbol for it,
* else NULL
*/
AggregateDeclaration *isAggregate(Type *t)
{
t = t->toBasetype();
if (t->ty == Tclass)
{
return ((TypeClass *)t)->sym;
}
else if (t->ty == Tstruct)
{
return ((TypeStruct *)t)->sym;
}
return NULL;
}
/*******************************************
* Helper function to turn operator into template argument list
*/
Objects *opToArg(Scope *sc, TOK op)
{
/* Remove the = from op=
*/
switch (op)
{
case TOKaddass: op = TOKadd; break;
case TOKminass: op = TOKmin; break;
case TOKmulass: op = TOKmul; break;
case TOKdivass: op = TOKdiv; break;
case TOKmodass: op = TOKmod; break;
case TOKandass: op = TOKand; break;
case TOKorass: op = TOKor; break;
case TOKxorass: op = TOKxor; break;
case TOKshlass: op = TOKshl; break;
case TOKshrass: op = TOKshr; break;
case TOKushrass: op = TOKushr; break;
case TOKcatass: op = TOKcat; break;
case TOKpowass: op = TOKpow; break;
}
Expression *e = new StringExp(Loc(), (char *)Token::toChars(op));
e = e->semantic(sc);
Objects *tiargs = new Objects();
tiargs->push(e);
return tiargs;
}
/************************************
* Operator overload.
* Check for operator overload, if so, replace
* with function call.
* Return NULL if not an operator overload.
*/
Expression *op_overload(Expression *e, Scope *sc)
{
class OpOverload : public Visitor
{
public:
Scope *sc;
Expression *result;
OpOverload(Scope *sc)
: sc(sc)
{
result = NULL;
}
void visit(Expression *e)
{
assert(0);
}
void visit(UnaExp *e)
{
//printf("UnaExp::op_overload() (%s)\n", e->toChars());
if (e->e1->op == TOKarray)
{
ArrayExp *ae = (ArrayExp *)e->e1;
ae->e1 = ae->e1->semantic(sc);
ae->e1 = resolveProperties(sc, ae->e1);
Expression *ae1old = ae->e1;
const bool maybeSlice =
(ae->arguments->dim == 0 ||
ae->arguments->dim == 1 && (*ae->arguments)[0]->op == TOKinterval);
IntervalExp *ie = NULL;
if (maybeSlice && ae->arguments->dim)
{
assert((*ae->arguments)[0]->op == TOKinterval);
ie = (IntervalExp *)(*ae->arguments)[0];
}
while (true)
{
if (ae->e1->op == TOKerror)
{
result = ae->e1;
return;
}
Expression *e0 = NULL;
Expression *ae1save = ae->e1;
ae->lengthVar = NULL;
Type *t1b = ae->e1->type->toBasetype();
AggregateDeclaration *ad = isAggregate(t1b);
if (!ad)
break;
if (search_function(ad, Id::opIndexUnary))
{
// Deal with $
result = resolveOpDollar(sc, ae, &e0);
if (!result) // op(a[i..j]) might be: a.opSliceUnary!(op)(i, j)
goto Lfallback;
if (result->op == TOKerror)
return;
/* Rewrite op(a[arguments]) as:
* a.opIndexUnary!(op)(arguments)
*/
Expressions *a = (Expressions *)ae->arguments->copy();
Objects *tiargs = opToArg(sc, e->op);
result = new DotTemplateInstanceExp(e->loc, ae->e1, Id::opIndexUnary, tiargs);
result = new CallExp(e->loc, result, a);
if (maybeSlice) // op(a[]) might be: a.opSliceUnary!(op)()
result = result->trySemantic(sc);
else
result = result->semantic(sc);
if (result)
{
result = Expression::combine(e0, result);
return;
}
}
Lfallback:
if (maybeSlice && search_function(ad, Id::opSliceUnary))
{
// Deal with $
result = resolveOpDollar(sc, ae, ie, &e0);
if (result->op == TOKerror)
return;
/* Rewrite op(a[i..j]) as:
* a.opSliceUnary!(op)(i, j)
*/
Expressions *a = new Expressions();
if (ie)
{
a->push(ie->lwr);
a->push(ie->upr);
}
Objects *tiargs = opToArg(sc, e->op);
result = new DotTemplateInstanceExp(e->loc, ae->e1, Id::opSliceUnary, tiargs);
result = new CallExp(e->loc, result, a);
result = result->semantic(sc);
result = Expression::combine(e0, result);
return;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis && t1b != ae->att1)
{
if (!ae->att1 && t1b->checkAliasThisRec())
ae->att1 = t1b;
/* Rewrite op(a[arguments]) as:
* op(a.aliasthis[arguments])
*/
ae->e1 = resolveAliasThis(sc, ae1save, true);
if (ae->e1)
continue;
}
break;
}
ae->e1 = ae1old; // recovery
ae->lengthVar = NULL;
}
e->e1 = e->e1->semantic(sc);
e->e1 = resolveProperties(sc, e->e1);
if (e->e1->op == TOKerror)
{
result = e->e1;
return;
}
AggregateDeclaration *ad = isAggregate(e->e1->type);
if (ad)
{
Dsymbol *fd = NULL;
#if 1 // Old way, kept for compatibility with D1
if (e->op != TOKpreplusplus && e->op != TOKpreminusminus)
{
fd = search_function(ad, opId(e));
if (fd)
{
// Rewrite +e1 as e1.add()
result = build_overload(e->loc, sc, e->e1, NULL, fd);
return;
}
}
#endif
/* Rewrite as:
* e1.opUnary!(op)()
*/
fd = search_function(ad, Id::opUnary);
if (fd)
{
Objects *tiargs = opToArg(sc, e->op);
result = new DotTemplateInstanceExp(e->loc, e->e1, fd->ident, tiargs);
result = new CallExp(e->loc, result);
result = result->semantic(sc);
return;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis && e->e1->type != e->att1)
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
//printf("att una %s e1 = %s\n", Token::toChars(op), this->e1->type->toChars());
Expression *e1 = new DotIdExp(e->loc, e->e1, ad->aliasthis->ident);
UnaExp *ue = (UnaExp *)e->copy();
if (!ue->att1 && e->e1->type->checkAliasThisRec())
ue->att1 = e->e1->type;
ue->e1 = e1;
result = ue->trySemantic(sc);
return;
}
}
}
void visit(ArrayExp *ae)
{
//printf("ArrayExp::op_overload() (%s)\n", ae->toChars());
ae->e1 = ae->e1->semantic(sc);
ae->e1 = resolveProperties(sc, ae->e1);
Expression *ae1old = ae->e1;
const bool maybeSlice =
(ae->arguments->dim == 0 ||
ae->arguments->dim == 1 && (*ae->arguments)[0]->op == TOKinterval);
IntervalExp *ie = NULL;
if (maybeSlice && ae->arguments->dim)
{
assert((*ae->arguments)[0]->op == TOKinterval);
ie = (IntervalExp *)(*ae->arguments)[0];
}
while (true)
{
if (ae->e1->op == TOKerror)
{
result = ae->e1;
return;
}
Expression *e0 = NULL;
Expression *ae1save = ae->e1;
ae->lengthVar = NULL;
Type *t1b = ae->e1->type->toBasetype();
AggregateDeclaration *ad = isAggregate(t1b);
if (!ad)
{
// If the non-aggregate expression ae->e1 is indexable or sliceable,
// convert it to the corresponding concrete expression.
if (t1b->ty == Tpointer ||
t1b->ty == Tsarray ||
t1b->ty == Tarray ||
t1b->ty == Taarray ||
t1b->ty == Ttuple ||
ae->e1->op == TOKtype)
{
// Convert to SliceExp
if (maybeSlice)
{
result = new SliceExp(ae->loc, ae->e1, ie);
result = result->semantic(sc);
return;
}
// Convert to IndexExp
if (ae->arguments->dim == 1)
{
result = new IndexExp(ae->loc, ae->e1, (*ae->arguments)[0]);
result = result->semantic(sc);
return;
}
}
break;
}
if (search_function(ad, Id::index))
{
// Deal with $
result = resolveOpDollar(sc, ae, &e0);
if (!result) // a[i..j] might be: a.opSlice(i, j)
goto Lfallback;
if (result->op == TOKerror)
return;
/* Rewrite e1[arguments] as:
* e1.opIndex(arguments)
*/
Expressions *a = (Expressions *)ae->arguments->copy();
result = new DotIdExp(ae->loc, ae->e1, Id::index);
result = new CallExp(ae->loc, result, a);
if (maybeSlice) // a[] might be: a.opSlice()
result = result->trySemantic(sc);
else
result = result->semantic(sc);
if (result)
{
result = Expression::combine(e0, result);
return;
}
}
Lfallback:
if (maybeSlice && ae->e1->op == TOKtype)
{
result = new SliceExp(ae->loc, ae->e1, ie);
result = result->semantic(sc);
result = Expression::combine(e0, result);
return;
}
if (maybeSlice && search_function(ad, Id::slice))
{
// Deal with $
result = resolveOpDollar(sc, ae, ie, &e0);
if (result->op == TOKerror)
return;
/* Rewrite a[i..j] as:
* a.opSlice(i, j)
*/
Expressions *a = new Expressions();
if (ie)
{
a->push(ie->lwr);
a->push(ie->upr);
}
result = new DotIdExp(ae->loc, ae->e1, Id::slice);
result = new CallExp(ae->loc, result, a);
result = result->semantic(sc);
result = Expression::combine(e0, result);
return;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis && t1b != ae->att1)
{
if (!ae->att1 && t1b->checkAliasThisRec())
ae->att1 = t1b;
//printf("att arr e1 = %s\n", this->e1->type->toChars());
/* Rewrite op(a[arguments]) as:
* op(a.aliasthis[arguments])
*/
ae->e1 = resolveAliasThis(sc, ae1save, true);
if (ae->e1)
continue;
}
break;
}
ae->e1 = ae1old; // recovery
ae->lengthVar = NULL;
}
/***********************************************
* This is mostly the same as UnaryExp::op_overload(), but has
* a different rewrite.
*/
void visit(CastExp *e)
{
//printf("CastExp::op_overload() (%s)\n", e->toChars());
AggregateDeclaration *ad = isAggregate(e->e1->type);
if (ad)
{
Dsymbol *fd = NULL;
/* Rewrite as:
* e1.opCast!(T)()
*/
fd = search_function(ad, Id::cast);
if (fd)
{
#if 1 // Backwards compatibility with D1 if opCast is a function, not a template
if (fd->isFuncDeclaration())
{
// Rewrite as: e1.opCast()
result = build_overload(e->loc, sc, e->e1, NULL, fd);
return;
}
#endif
Objects *tiargs = new Objects();
tiargs->push(e->to);
result = new DotTemplateInstanceExp(e->loc, e->e1, fd->ident, tiargs);
result = new CallExp(e->loc, result);
result = result->semantic(sc);
return;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
Expression *e1 = new DotIdExp(e->loc, e->e1, ad->aliasthis->ident);
result = e->copy();
((UnaExp *)result)->e1 = e1;
result = result->trySemantic(sc);
return;
}
}
}
void visit(BinExp *e)
{
//printf("BinExp::op_overload() (%s)\n", e->toChars());
Identifier *id = opId(e);
Identifier *id_r = opId_r(e);
Expressions args1;
Expressions args2;
int argsset = 0;
AggregateDeclaration *ad1 = isAggregate(e->e1->type);
AggregateDeclaration *ad2 = isAggregate(e->e2->type);
if (e->op == TOKassign && ad1 == ad2)
{
StructDeclaration *sd = ad1->isStructDeclaration();
if (sd && !sd->hasIdentityAssign)
{
/* This is bitwise struct assignment. */
return;
}
}
Dsymbol *s = NULL;
Dsymbol *s_r = NULL;
#if 1 // the old D1 scheme
if (ad1 && id)
{
s = search_function(ad1, id);
}
if (ad2 && id_r)
{
s_r = search_function(ad2, id_r);
// Bugzilla 12778: If both x.opBinary(y) and y.opBinaryRight(x) found,
// and they are exactly same symbol, x.opBinary(y) should be preferred.
if (s_r && s_r == s)
s_r = NULL;
}
#endif
Objects *tiargs = NULL;
if (e->op == TOKplusplus || e->op == TOKminusminus)
{
// Bug4099 fix
if (ad1 && search_function(ad1, Id::opUnary))
return;
}
if (!s && !s_r && e->op != TOKequal && e->op != TOKnotequal && e->op != TOKassign &&
e->op != TOKplusplus && e->op != TOKminusminus)
{
/* Try the new D2 scheme, opBinary and opBinaryRight
*/
if (ad1)
{
s = search_function(ad1, Id::opBinary);
if (s && !s->isTemplateDeclaration())
{
e->e1->error("%s.opBinary isn't a template", e->e1->toChars());
result = new ErrorExp();
return;
}
}
if (ad2)
{
s_r = search_function(ad2, Id::opBinaryRight);
if (s_r && !s_r->isTemplateDeclaration())
{
e->e2->error("%s.opBinaryRight isn't a template", e->e2->toChars());
result = new ErrorExp();
return;
}
if (s_r && s_r == s) // Bugzilla 12778
s_r = NULL;
}
// Set tiargs, the template argument list, which will be the operator string
if (s || s_r)
{
id = Id::opBinary;
id_r = Id::opBinaryRight;
tiargs = opToArg(sc, e->op);
}
}
if (s || s_r)
{
/* Try:
* a.opfunc(b)
* b.opfunc_r(a)
* and see which is better.
*/
args1.setDim(1);
args1[0] = e->e1;
expandTuples(&args1);
args2.setDim(1);
args2[0] = e->e2;
expandTuples(&args2);
argsset = 1;
Match m;
memset(&m, 0, sizeof(m));
m.last = MATCHnomatch;
if (s)
{
functionResolve(&m, s, e->loc, sc, tiargs, e->e1->type, &args2);
if (m.lastf && m.lastf->errors)
{
result = new ErrorExp();
return;
}
}
FuncDeclaration *lastf = m.lastf;
if (s_r)
{
functionResolve(&m, s_r, e->loc, sc, tiargs, e->e2->type, &args1);
if (m.lastf && m.lastf->errors)
{
result = new ErrorExp();
return;
}
}
if (m.count > 1)
{
// Error, ambiguous
e->error("overloads %s and %s both match argument list for %s",
m.lastf->type->toChars(),
m.nextf->type->toChars(),
m.lastf->toChars());
}
else if (m.last <= MATCHnomatch)
{
m.lastf = m.anyf;
if (tiargs)
goto L1;
}
if (e->op == TOKplusplus || e->op == TOKminusminus)
{
// Kludge because operator overloading regards e++ and e--
// as unary, but it's implemented as a binary.
// Rewrite (e1 ++ e2) as e1.postinc()
// Rewrite (e1 -- e2) as e1.postdec()
result = build_overload(e->loc, sc, e->e1, NULL, m.lastf ? m.lastf : s);
}
else if (lastf && m.lastf == lastf || !s_r && m.last <= MATCHnomatch)
{
// Rewrite (e1 op e2) as e1.opfunc(e2)
result = build_overload(e->loc, sc, e->e1, e->e2, m.lastf ? m.lastf : s);
}
else
{
// Rewrite (e1 op e2) as e2.opfunc_r(e1)
result = build_overload(e->loc, sc, e->e2, e->e1, m.lastf ? m.lastf : s_r);
}
return;
}
L1:
#if 1 // Retained for D1 compatibility
if (isCommutative(e->op) && !tiargs)
{
s = NULL;
s_r = NULL;
if (ad1 && id_r)
{
s_r = search_function(ad1, id_r);
}
if (ad2 && id)
{
s = search_function(ad2, id);
if (s && s == s_r) // Bugzilla 12778
s = NULL;
}
if (s || s_r)
{
/* Try:
* a.opfunc_r(b)
* b.opfunc(a)
* and see which is better.
*/
if (!argsset)
{
args1.setDim(1);
args1[0] = e->e1;
expandTuples(&args1);
args2.setDim(1);
args2[0] = e->e2;
expandTuples(&args2);
}
Match m;
memset(&m, 0, sizeof(m));
m.last = MATCHnomatch;
if (s_r)
{
functionResolve(&m, s_r, e->loc, sc, tiargs, e->e1->type, &args2);
if (m.lastf && m.lastf->errors)
{
result = new ErrorExp();
return;
}
}
FuncDeclaration *lastf = m.lastf;
if (s)
{
functionResolve(&m, s, e->loc, sc, tiargs, e->e2->type, &args1);
if (m.lastf && m.lastf->errors)
{
result = new ErrorExp();
return;
}
}
if (m.count > 1)
{
// Error, ambiguous
e->error("overloads %s and %s both match argument list for %s",
m.lastf->type->toChars(),
m.nextf->type->toChars(),
m.lastf->toChars());
}
else if (m.last <= MATCHnomatch)
{
m.lastf = m.anyf;
}
if (lastf && m.lastf == lastf || !s && m.last <= MATCHnomatch)
{
// Rewrite (e1 op e2) as e1.opfunc_r(e2)
result = build_overload(e->loc, sc, e->e1, e->e2, m.lastf ? m.lastf : s_r);
}
else
{
// Rewrite (e1 op e2) as e2.opfunc(e1)
result = build_overload(e->loc, sc, e->e2, e->e1, m.lastf ? m.lastf : s);
}
// When reversing operands of comparison operators,
// need to reverse the sense of the op
switch (e->op)
{
case TOKlt: e->op = TOKgt; break;
case TOKgt: e->op = TOKlt; break;
case TOKle: e->op = TOKge; break;
case TOKge: e->op = TOKle; break;
// Floating point compares
case TOKule: e->op = TOKuge; break;
case TOKul: e->op = TOKug; break;
case TOKuge: e->op = TOKule; break;
case TOKug: e->op = TOKul; break;
// These are symmetric
case TOKunord:
case TOKlg:
case TOKleg:
case TOKue:
break;
}
return;
}
}
#endif
// Try alias this on first operand
if (ad1 && ad1->aliasthis &&
!(e->op == TOKassign && ad2 && ad1 == ad2)) // See Bugzilla 2943
{
/* Rewrite (e1 op e2) as:
* (e1.aliasthis op e2)
*/
if (e->att1 && e->e1->type == e->att1)
return;
//printf("att bin e1 = %s\n", this->e1->type->toChars());
Expression *e1 = new DotIdExp(e->loc, e->e1, ad1->aliasthis->ident);
BinExp *be = (BinExp *)e->copy();
if (!be->att1 && e->e1->type->checkAliasThisRec())
be->att1 = e->e1->type;
be->e1 = e1;
result = be->trySemantic(sc);
return;
}
// Try alias this on second operand
/* Bugzilla 2943: make sure that when we're copying the struct, we don't
* just copy the alias this member
*/
if (ad2 && ad2->aliasthis &&
!(e->op == TOKassign && ad1 && ad1 == ad2))
{
/* Rewrite (e1 op e2) as:
* (e1 op e2.aliasthis)
*/
if (e->att2 && e->e2->type == e->att2)
return;
//printf("att bin e2 = %s\n", e->e2->type->toChars());
Expression *e2 = new DotIdExp(e->loc, e->e2, ad2->aliasthis->ident);
BinExp *be = (BinExp *)e->copy();
if (!be->att2 && e->e2->type->checkAliasThisRec())
be->att2 = e->e2->type;
be->e2 = e2;
result = be->trySemantic(sc);
return;
}
return;
}
void visit(EqualExp *e)
{
//printf("EqualExp::op_overload() (%s)\n", e->toChars());
Type *t1 = e->e1->type->toBasetype();
Type *t2 = e->e2->type->toBasetype();
if (t1->ty == Tclass && t2->ty == Tclass)
{
ClassDeclaration *cd1 = t1->isClassHandle();
ClassDeclaration *cd2 = t2->isClassHandle();
if (!(cd1->cpp || cd2->cpp))
{
/* Rewrite as:
* .object.opEquals(e1, e2)
*/
Expression *e1x = e->e1;
Expression *e2x = e->e2;
/*
* The explicit cast is necessary for interfaces,
* see http://d.puremagic.com/issues/show_bug.cgi?id=4088
*/
Type *to = ClassDeclaration::object->getType();
if (cd1->isInterfaceDeclaration())
e1x = new CastExp(e->loc, e->e1, t1->isMutable() ? to : to->constOf());
if (cd2->isInterfaceDeclaration())
e2x = new CastExp(e->loc, e->e2, t2->isMutable() ? to : to->constOf());
result = new IdentifierExp(e->loc, Id::empty);
result = new DotIdExp(e->loc, result, Id::object);
result = new DotIdExp(e->loc, result, Id::eq);
result = new CallExp(e->loc, result, e1x, e2x);
result = result->semantic(sc);
return;
}
}
// Comparing a class with typeof(null) should not call opEquals
if (t1->ty == Tclass && t2->ty == Tnull ||
t1->ty == Tnull && t2->ty == Tclass)
{
}
else
{
result = compare_overload(e, sc, Id::eq);
}
}
void visit(CmpExp *e)
{
//printf("CmpExp::op_overload() (%s)\n", e->toChars());
result = compare_overload(e, sc, Id::cmp);
}
/*********************************
* Operator overloading for op=
*/
void visit(BinAssignExp *e)
{
//printf("BinAssignExp::op_overload() (%s)\n", e->toChars());
if (e->e1->op == TOKarray)
{
ArrayExp *ae = (ArrayExp *)e->e1;
ae->e1 = ae->e1->semantic(sc);
ae->e1 = resolveProperties(sc, ae->e1);
Expression *ae1old = ae->e1;
const bool maybeSlice =
(ae->arguments->dim == 0 ||
ae->arguments->dim == 1 && (*ae->arguments)[0]->op == TOKinterval);
IntervalExp *ie = NULL;
if (maybeSlice && ae->arguments->dim)
{
assert((*ae->arguments)[0]->op == TOKinterval);
ie = (IntervalExp *)(*ae->arguments)[0];
}
while (true)
{
if (ae->e1->op == TOKerror)
{
result = ae->e1;
return;
}
Expression *e0 = NULL;
Expression *ae1save = ae->e1;
ae->lengthVar = NULL;
Type *t1b = ae->e1->type->toBasetype();
AggregateDeclaration *ad = isAggregate(t1b);
if (!ad)
break;
if (search_function(ad, Id::opIndexOpAssign))
{
// Deal with $