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opover.c
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2010 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 <stdlib.h>
#include <ctype.h>
#include <assert.h>
#if _MSC_VER
#include <complex>
#else
#include <complex.h>
#endif
#ifdef __APPLE__
#define integer_t dmd_integer_t
#endif
#include "rmem.h"
//#include "port.h"
#include "mtype.h"
#include "init.h"
#include "expression.h"
#include "id.h"
#include "declaration.h"
#include "aggregate.h"
#include "template.h"
static void inferApplyArgTypesX(FuncDeclaration *fstart, Parameters *arguments);
static void inferApplyArgTypesZ(TemplateDeclaration *tstart, Parameters *arguments);
static int inferApplyArgTypesY(TypeFunction *tf, Parameters *arguments);
static void templateResolve(Match *m, TemplateDeclaration *td, Scope *sc, Loc loc, Objects *targsi, Expression *ethis, Expressions *arguments);
/******************************** Expression **************************/
/***********************************
* Determine if operands of binary op can be reversed
* to fit operator overload.
*/
int Expression::isCommutative()
{
return FALSE; // default is no reverse
}
/***********************************
* Get Identifier for operator overload.
*/
Identifier *Expression::opId()
{
assert(0);
return NULL;
}
/***********************************
* Get Identifier for reverse operator overload,
* NULL if not supported for this operator.
*/
Identifier *Expression::opId_r()
{
return NULL;
}
/************************* Operators *****************************/
Identifier *UAddExp::opId() { return Id::uadd; }
Identifier *NegExp::opId() { return Id::neg; }
Identifier *ComExp::opId() { return Id::com; }
Identifier *CastExp::opId() { return Id::cast; }
Identifier *InExp::opId() { return Id::opIn; }
Identifier *InExp::opId_r() { return Id::opIn_r; }
Identifier *PostExp::opId() { return (op == TOKplusplus)
? Id::postinc
: Id::postdec; }
int AddExp::isCommutative() { return TRUE; }
Identifier *AddExp::opId() { return Id::add; }
Identifier *AddExp::opId_r() { return Id::add_r; }
Identifier *MinExp::opId() { return Id::sub; }
Identifier *MinExp::opId_r() { return Id::sub_r; }
int MulExp::isCommutative() { return TRUE; }
Identifier *MulExp::opId() { return Id::mul; }
Identifier *MulExp::opId_r() { return Id::mul_r; }
Identifier *DivExp::opId() { return Id::div; }
Identifier *DivExp::opId_r() { return Id::div_r; }
Identifier *ModExp::opId() { return Id::mod; }
Identifier *ModExp::opId_r() { return Id::mod_r; }
#if DMDV2
Identifier *PowExp::opId() { return Id::pow; }
Identifier *PowExp::opId_r() { return Id::pow_r; }
#endif
Identifier *ShlExp::opId() { return Id::shl; }
Identifier *ShlExp::opId_r() { return Id::shl_r; }
Identifier *ShrExp::opId() { return Id::shr; }
Identifier *ShrExp::opId_r() { return Id::shr_r; }
Identifier *UshrExp::opId() { return Id::ushr; }
Identifier *UshrExp::opId_r() { return Id::ushr_r; }
int AndExp::isCommutative() { return TRUE; }
Identifier *AndExp::opId() { return Id::iand; }
Identifier *AndExp::opId_r() { return Id::iand_r; }
int OrExp::isCommutative() { return TRUE; }
Identifier *OrExp::opId() { return Id::ior; }
Identifier *OrExp::opId_r() { return Id::ior_r; }
int XorExp::isCommutative() { return TRUE; }
Identifier *XorExp::opId() { return Id::ixor; }
Identifier *XorExp::opId_r() { return Id::ixor_r; }
Identifier *CatExp::opId() { return Id::cat; }
Identifier *CatExp::opId_r() { return Id::cat_r; }
Identifier * AssignExp::opId() { return Id::assign; }
Identifier * AddAssignExp::opId() { return Id::addass; }
Identifier * MinAssignExp::opId() { return Id::subass; }
Identifier * MulAssignExp::opId() { return Id::mulass; }
Identifier * DivAssignExp::opId() { return Id::divass; }
Identifier * ModAssignExp::opId() { return Id::modass; }
Identifier * AndAssignExp::opId() { return Id::andass; }
Identifier * OrAssignExp::opId() { return Id::orass; }
Identifier * XorAssignExp::opId() { return Id::xorass; }
Identifier * ShlAssignExp::opId() { return Id::shlass; }
Identifier * ShrAssignExp::opId() { return Id::shrass; }
Identifier *UshrAssignExp::opId() { return Id::ushrass; }
Identifier * CatAssignExp::opId() { return Id::catass; }
Identifier * PowAssignExp::opId() { return Id::powass; }
int EqualExp::isCommutative() { return TRUE; }
Identifier *EqualExp::opId() { return Id::eq; }
int CmpExp::isCommutative() { return TRUE; }
Identifier *CmpExp::opId() { return Id::cmp; }
Identifier *ArrayExp::opId() { return Id::index; }
Identifier *PtrExp::opId() { return Id::opStar; }
/************************************
* 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, enum 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(0, (char *)Token::toChars(op));
e = e->semantic(sc);
Objects *targsi = new Objects();
targsi->push(e);
return targsi;
}
/************************************
* Operator overload.
* Check for operator overload, if so, replace
* with function call.
* Return NULL if not an operator overload.
*/
Expression *UnaExp::op_overload(Scope *sc)
{
//printf("UnaExp::op_overload() (%s)\n", toChars());
#if DMDV2
if (e1->op == TOKarray)
{
ArrayExp *ae = (ArrayExp *)e1;
ae->e1 = ae->e1->semantic(sc);
ae->e1 = resolveProperties(sc, ae->e1);
AggregateDeclaration *ad = isAggregate(ae->e1->type);
if (ad)
{
/* Rewrite as:
* a.opIndexUnary!("+")(args);
*/
Dsymbol *fd = search_function(ad, Id::opIndexUnary);
if (fd)
{
Objects *targsi = opToArg(sc, op);
Expression *e = new DotTemplateInstanceExp(loc, ae->e1, fd->ident, targsi);
e = new CallExp(loc, e, ae->arguments);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite op(a[arguments]) as:
* op(a.aliasthis[arguments])
*/
Expression *e1 = ae->copy();
((ArrayExp *)e1)->e1 = new DotIdExp(loc, ae->e1, ad->aliasthis->ident);
Expression *e = copy();
((UnaExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
}
}
else if (e1->op == TOKslice)
{
SliceExp *se = (SliceExp *)e1;
se->e1 = se->e1->semantic(sc);
se->e1 = resolveProperties(sc, se->e1);
AggregateDeclaration *ad = isAggregate(se->e1->type);
if (ad)
{
/* Rewrite as:
* a.opSliceUnary!("+")(lwr, upr);
*/
Dsymbol *fd = search_function(ad, Id::opSliceUnary);
if (fd)
{
Expressions *a = new Expressions();
if (se->lwr)
{ a->push(se->lwr);
a->push(se->upr);
}
Objects *targsi = opToArg(sc, op);
Expression *e = new DotTemplateInstanceExp(loc, se->e1, fd->ident, targsi);
e = new CallExp(loc, e, a);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite op(a[lwr..upr]) as:
* op(a.aliasthis[lwr..upr])
*/
Expression *e1 = se->copy();
((SliceExp *)e1)->e1 = new DotIdExp(loc, se->e1, ad->aliasthis->ident);
Expression *e = copy();
((UnaExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
}
}
#endif
e1 = e1->semantic(sc);
e1 = resolveProperties(sc, e1);
AggregateDeclaration *ad = isAggregate(e1->type);
if (ad)
{
Dsymbol *fd = NULL;
#if 1 // Old way, kept for compatibility with D1
if (op != TOKpreplusplus && op != TOKpreminusminus)
{ fd = search_function(ad, opId());
if (fd)
{
if (op == TOKarray)
{
/* Rewrite op e1[arguments] as:
* e1.fd(arguments)
*/
Expression *e = new DotIdExp(loc, e1, fd->ident);
ArrayExp *ae = (ArrayExp *)this;
e = new CallExp(loc, e, ae->arguments);
e = e->semantic(sc);
return e;
}
else
{
// Rewrite +e1 as e1.add()
return build_overload(loc, sc, e1, NULL, fd);
}
}
}
#endif
#if DMDV2
/* Rewrite as:
* e1.opUnary!("+")();
*/
fd = search_function(ad, Id::opUnary);
if (fd)
{
Objects *targsi = opToArg(sc, op);
Expression *e = new DotTemplateInstanceExp(loc, e1, fd->ident, targsi);
e = new CallExp(loc, e);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
Expression *e1 = new DotIdExp(loc, this->e1, ad->aliasthis->ident);
Expression *e = copy();
((UnaExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
#endif
}
return NULL;
}
Expression *ArrayExp::op_overload(Scope *sc)
{
//printf("ArrayExp::op_overload() (%s)\n", toChars());
AggregateDeclaration *ad = isAggregate(e1->type);
if (ad)
{
Dsymbol *fd = search_function(ad, opId());
if (fd)
{
/* Rewrite op e1[arguments] as:
* e1.opIndex(arguments)
*/
Expression *e = new DotIdExp(loc, e1, fd->ident);
e = new CallExp(loc, e, arguments);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
Expression *e1 = new DotIdExp(loc, this->e1, ad->aliasthis->ident);
Expression *e = copy();
((UnaExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
}
return NULL;
}
/***********************************************
* This is mostly the same as UnaryExp::op_overload(), but has
* a different rewrite.
*/
Expression *CastExp::op_overload(Scope *sc)
{
//printf("CastExp::op_overload() (%s)\n", toChars());
AggregateDeclaration *ad = isAggregate(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()
return build_overload(loc, sc, e1, NULL, fd);
}
#endif
Objects *targsi = new Objects();
targsi->push(to);
Expression *e = new DotTemplateInstanceExp(loc, e1, fd->ident, targsi);
e = new CallExp(loc, e);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
Expression *e1 = new DotIdExp(loc, this->e1, ad->aliasthis->ident);
Expression *e = copy();
((UnaExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
}
return NULL;
}
Expression *BinExp::op_overload(Scope *sc)
{
//printf("BinExp::op_overload() (%s)\n", toChars());
Identifier *id = opId();
Identifier *id_r = opId_r();
Expressions args1;
Expressions args2;
int argsset = 0;
AggregateDeclaration *ad1 = isAggregate(e1->type);
AggregateDeclaration *ad2 = isAggregate(e2->type);
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);
}
#endif
Objects *targsi = NULL;
#if DMDV2
if (!s && !s_r && op != TOKequal && op != TOKnotequal && op != TOKassign &&
op != TOKplusplus && op != TOKminusminus)
{
/* Try the new D2 scheme, opBinary and opBinaryRight
*/
if (ad1)
s = search_function(ad1, Id::opBinary);
if (ad2)
s_r = search_function(ad2, Id::opBinaryRight);
// Set targsi, the template argument list, which will be the operator string
if (s || s_r)
{
id = Id::opBinary;
id_r = Id::opBinaryRight;
targsi = opToArg(sc, op);
}
}
#endif
if (s || s_r)
{
/* Try:
* a.opfunc(b)
* b.opfunc_r(a)
* and see which is better.
*/
args1.setDim(1);
args1.tdata()[0] = e1;
args2.setDim(1);
args2.tdata()[0] = e2;
argsset = 1;
Match m;
memset(&m, 0, sizeof(m));
m.last = MATCHnomatch;
if (s)
{
FuncDeclaration *fd = s->isFuncDeclaration();
if (fd)
{
overloadResolveX(&m, fd, NULL, &args2);
}
else
{ TemplateDeclaration *td = s->isTemplateDeclaration();
templateResolve(&m, td, sc, loc, targsi, e1, &args2);
}
}
FuncDeclaration *lastf = m.lastf;
if (s_r)
{
FuncDeclaration *fd = s_r->isFuncDeclaration();
if (fd)
{
overloadResolveX(&m, fd, NULL, &args1);
}
else
{ TemplateDeclaration *td = s_r->isTemplateDeclaration();
templateResolve(&m, td, sc, loc, targsi, e2, &args1);
}
}
if (m.count > 1)
{
// Error, ambiguous
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 (targsi)
goto L1;
}
Expression *e;
if (op == TOKplusplus || 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()
e = build_overload(loc, sc, 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)
e = build_overload(loc, sc, e1, e2, m.lastf ? m.lastf : s);
else
// Rewrite (e1 op e2) as e2.opfunc_r(e1)
e = build_overload(loc, sc, e2, e1, m.lastf ? m.lastf : s_r);
return e;
}
L1:
#if 1 // Retained for D1 compatibility
if (isCommutative() && !targsi)
{
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_r)
{
/* Try:
* a.opfunc_r(b)
* b.opfunc(a)
* and see which is better.
*/
if (!argsset)
{ args1.setDim(1);
args1.tdata()[0] = e1;
args2.setDim(1);
args2.tdata()[0] = e2;
}
Match m;
memset(&m, 0, sizeof(m));
m.last = MATCHnomatch;
if (s_r)
{
FuncDeclaration *fd = s_r->isFuncDeclaration();
if (fd)
{
overloadResolveX(&m, fd, NULL, &args2);
}
else
{ TemplateDeclaration *td = s_r->isTemplateDeclaration();
templateResolve(&m, td, sc, loc, targsi, e1, &args2);
}
}
FuncDeclaration *lastf = m.lastf;
if (s)
{
FuncDeclaration *fd = s->isFuncDeclaration();
if (fd)
{
overloadResolveX(&m, fd, NULL, &args1);
}
else
{ TemplateDeclaration *td = s->isTemplateDeclaration();
templateResolve(&m, td, sc, loc, targsi, e2, &args1);
}
}
if (m.count > 1)
{
// Error, ambiguous
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;
}
Expression *e;
if (lastf && m.lastf == lastf || !s && m.last == MATCHnomatch)
// Rewrite (e1 op e2) as e1.opfunc_r(e2)
e = build_overload(loc, sc, e1, e2, m.lastf ? m.lastf : s_r);
else
// Rewrite (e1 op e2) as e2.opfunc(e1)
e = build_overload(loc, sc, e2, e1, m.lastf ? m.lastf : s);
// When reversing operands of comparison operators,
// need to reverse the sense of the op
switch (op)
{
case TOKlt: op = TOKgt; break;
case TOKgt: op = TOKlt; break;
case TOKle: op = TOKge; break;
case TOKge: op = TOKle; break;
// Floating point compares
case TOKule: op = TOKuge; break;
case TOKul: op = TOKug; break;
case TOKuge: op = TOKule; break;
case TOKug: op = TOKul; break;
// These are symmetric
case TOKunord:
case TOKlg:
case TOKleg:
case TOKue:
break;
}
return e;
}
}
#endif
#if DMDV2
// Try alias this on first operand
if (ad1 && ad1->aliasthis &&
!(op == TOKassign && ad2 && ad1 == ad2)) // See Bugzilla 2943
{
/* Rewrite (e1 op e2) as:
* (e1.aliasthis op e2)
*/
Expression *e1 = new DotIdExp(loc, this->e1, ad1->aliasthis->ident);
Expression *e = copy();
((BinExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
// Try alias this on second operand
if (ad2 && ad2->aliasthis &&
/* Bugzilla 2943: make sure that when we're copying the struct, we don't
* just copy the alias this member
*/
!(op == TOKassign && ad1 && ad1 == ad2))
{
/* Rewrite (e1 op e2) as:
* (e1 op e2.aliasthis)
*/
Expression *e2 = new DotIdExp(loc, this->e2, ad2->aliasthis->ident);
Expression *e = copy();
((BinExp *)e)->e2 = e2;
e = e->trySemantic(sc);
return e;
}
#endif
return NULL;
}
/******************************************
* Common code for overloading of EqualExp and CmpExp
*/
Expression *BinExp::compare_overload(Scope *sc, Identifier *id)
{
//printf("BinExp::compare_overload(id = %s) %s\n", id->toChars(), toChars());
AggregateDeclaration *ad1 = isAggregate(e1->type);
AggregateDeclaration *ad2 = isAggregate(e2->type);
Dsymbol *s = NULL;
Dsymbol *s_r = NULL;
if (ad1)
{
s = search_function(ad1, id);
}
if (ad2)
{
s_r = search_function(ad2, id);
if (s == s_r)
s_r = NULL;
}
Objects *targsi = NULL;
if (s || s_r)
{
/* Try:
* a.opEquals(b)
* b.opEquals(a)
* and see which is better.
*/
Expressions args1;
Expressions args2;
args1.setDim(1);
args1.tdata()[0] = e1;
args2.setDim(1);
args2.tdata()[0] = e2;
Match m;
memset(&m, 0, sizeof(m));
m.last = MATCHnomatch;
if (0 && s && s_r)
{
printf("s : %s\n", s->toPrettyChars());
printf("s_r: %s\n", s_r->toPrettyChars());
}
if (s)
{
FuncDeclaration *fd = s->isFuncDeclaration();
if (fd)
{
overloadResolveX(&m, fd, NULL, &args2);
}
else
{ TemplateDeclaration *td = s->isTemplateDeclaration();
templateResolve(&m, td, sc, loc, targsi, NULL, &args2);
}
}
FuncDeclaration *lastf = m.lastf;
int count = m.count;
if (s_r)
{
FuncDeclaration *fd = s_r->isFuncDeclaration();
if (fd)
{
overloadResolveX(&m, fd, NULL, &args1);
}
else
{ TemplateDeclaration *td = s_r->isTemplateDeclaration();
templateResolve(&m, td, sc, loc, targsi, NULL, &args1);
}
}
if (m.count > 1)
{
/* The following if says "not ambiguous" if there's one match
* from s and one from s_r, in which case we pick s.
* This doesn't follow the spec, but is a workaround for the case
* where opEquals was generated from templates and we cannot figure
* out if both s and s_r came from the same declaration or not.
* The test case is:
* import std.typecons;
* void main() {
* assert(tuple("has a", 2u) == tuple("has a", 1));
* }
*/
if (!(m.lastf == lastf && m.count == 2 && count == 1))
{
// Error, ambiguous
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;
}
Expression *e;
if (lastf && m.lastf == lastf || !s_r && m.last == MATCHnomatch)
// Rewrite (e1 op e2) as e1.opfunc(e2)
e = build_overload(loc, sc, e1, e2, m.lastf ? m.lastf : s);
else
{ // Rewrite (e1 op e2) as e2.opfunc_r(e1)
e = build_overload(loc, sc, e2, e1, m.lastf ? m.lastf : s_r);
// When reversing operands of comparison operators,
// need to reverse the sense of the op
switch (op)
{
case TOKlt: op = TOKgt; break;
case TOKgt: op = TOKlt; break;
case TOKle: op = TOKge; break;
case TOKge: op = TOKle; break;
// Floating point compares
case TOKule: op = TOKuge; break;
case TOKul: op = TOKug; break;
case TOKuge: op = TOKule; break;
case TOKug: op = TOKul; break;
// The rest are symmetric
default:
break;
}
}
return e;
}
// Try alias this on first operand
if (ad1 && ad1->aliasthis)
{
/* Rewrite (e1 op e2) as:
* (e1.aliasthis op e2)
*/
Expression *e1 = new DotIdExp(loc, this->e1, ad1->aliasthis->ident);
Expression *e = copy();
((BinExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
// Try alias this on second operand
if (ad2 && ad2->aliasthis)
{
/* Rewrite (e1 op e2) as:
* (e1 op e2.aliasthis)
*/
Expression *e2 = new DotIdExp(loc, this->e2, ad2->aliasthis->ident);
Expression *e = copy();
((BinExp *)e)->e2 = e2;
e = e->trySemantic(sc);
return e;
}
return NULL;
}
Expression *EqualExp::op_overload(Scope *sc)
{
//printf("EqualExp::op_overload() (%s)\n", toChars());
Type *t1 = e1->type->toBasetype();
Type *t2 = e2->type->toBasetype();
if (t1->ty == Tclass && t2->ty == Tclass)
{
/* Rewrite as:
* .object.opEquals(e1, e2)
*/
Expression *e = new IdentifierExp(loc, Id::empty);
e = new DotIdExp(loc, e, Id::object);
e = new DotIdExp(loc, e, Id::eq);
e = new CallExp(loc, e, e1, e2);
e = e->semantic(sc);
return e;
}
return compare_overload(sc, Id::eq);
}
Expression *CmpExp::op_overload(Scope *sc)
{
//printf("CmpExp::op_overload() (%s)\n", toChars());
return compare_overload(sc, Id::cmp);
}
/*********************************
* Operator overloading for op=
*/
Expression *BinAssignExp::op_overload(Scope *sc)
{
//printf("BinAssignExp::op_overload() (%s)\n", toChars());
#if DMDV2
if (e1->op == TOKarray)
{
ArrayExp *ae = (ArrayExp *)e1;
ae->e1 = ae->e1->semantic(sc);
ae->e1 = resolveProperties(sc, ae->e1);
AggregateDeclaration *ad = isAggregate(ae->e1->type);
if (ad)
{
/* Rewrite a[args]+=e2 as:
* a.opIndexOpAssign!("+")(e2, args);
*/
Dsymbol *fd = search_function(ad, Id::opIndexOpAssign);
if (fd)
{
Expressions *a = new Expressions();
a->push(e2);
for (int i = 0; i < ae->arguments->dim; i++)
a->push(ae->arguments->tdata()[i]);
Objects *targsi = opToArg(sc, op);
Expression *e = new DotTemplateInstanceExp(loc, ae->e1, fd->ident, targsi);
e = new CallExp(loc, e, a);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite a[arguments] op= e2 as:
* a.aliasthis[arguments] op= e2
*/
Expression *e1 = ae->copy();
((ArrayExp *)e1)->e1 = new DotIdExp(loc, ae->e1, ad->aliasthis->ident);
Expression *e = copy();
((UnaExp *)e)->e1 = e1;
e = e->trySemantic(sc);
return e;
}
}
}
else if (e1->op == TOKslice)
{
SliceExp *se = (SliceExp *)e1;
se->e1 = se->e1->semantic(sc);
se->e1 = resolveProperties(sc, se->e1);
AggregateDeclaration *ad = isAggregate(se->e1->type);
if (ad)
{
/* Rewrite a[lwr..upr]+=e2 as:
* a.opSliceOpAssign!("+")(e2, lwr, upr);
*/
Dsymbol *fd = search_function(ad, Id::opSliceOpAssign);
if (fd)
{
Expressions *a = new Expressions();
a->push(e2);
if (se->lwr)
{ a->push(se->lwr);
a->push(se->upr);
}
Objects *targsi = opToArg(sc, op);
Expression *e = new DotTemplateInstanceExp(loc, se->e1, fd->ident, targsi);
e = new CallExp(loc, e, a);
e = e->semantic(sc);
return e;
}
// Didn't find it. Forward to aliasthis
if (ad->aliasthis)
{
/* Rewrite a[lwr..upr] op= e2 as:
* a.aliasthis[lwr..upr] op= e2