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opover.d
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opover.d
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/**
* Handles operator overloading.
*
* Specification: $(LINK2 https://dlang.org/spec/operatoroverloading.html, Operator Overloading)
*
* Copyright: Copyright (C) 1999-2023 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/opover.d, _opover.d)
* Documentation: https://dlang.org/phobos/dmd_opover.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/opover.d
*/
module dmd.opover;
import core.stdc.stdio;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arraytypes;
import dmd.astenums;
import dmd.dclass;
import dmd.declaration;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dtemplate;
import dmd.errors;
import dmd.expression;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.location;
import dmd.mtype;
import dmd.statement;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
/***********************************
* Determine if operands of binary op can be reversed
* to fit operator overload.
*/
bool isCommutative(EXP op)
{
switch (op)
{
case EXP.add:
case EXP.mul:
case EXP.and:
case EXP.or:
case EXP.xor:
// EqualExp
case EXP.equal:
case EXP.notEqual:
// CmpExp
case EXP.lessThan:
case EXP.lessOrEqual:
case EXP.greaterThan:
case EXP.greaterOrEqual:
return true;
default:
break;
}
return false;
}
/***********************************
* Get Identifier for operator overload.
*/
private Identifier opId(Expression e)
{
switch (e.op)
{
case EXP.uadd: return Id.uadd;
case EXP.negate: return Id.neg;
case EXP.tilde: return Id.com;
case EXP.cast_: return Id._cast;
case EXP.in_: return Id.opIn;
case EXP.plusPlus: return Id.postinc;
case EXP.minusMinus: return Id.postdec;
case EXP.add: return Id.add;
case EXP.min: return Id.sub;
case EXP.mul: return Id.mul;
case EXP.div: return Id.div;
case EXP.mod: return Id.mod;
case EXP.pow: return Id.pow;
case EXP.leftShift: return Id.shl;
case EXP.rightShift: return Id.shr;
case EXP.unsignedRightShift: return Id.ushr;
case EXP.and: return Id.iand;
case EXP.or: return Id.ior;
case EXP.xor: return Id.ixor;
case EXP.concatenate: return Id.cat;
case EXP.assign: return Id.assign;
case EXP.addAssign: return Id.addass;
case EXP.minAssign: return Id.subass;
case EXP.mulAssign: return Id.mulass;
case EXP.divAssign: return Id.divass;
case EXP.modAssign: return Id.modass;
case EXP.powAssign: return Id.powass;
case EXP.leftShiftAssign: return Id.shlass;
case EXP.rightShiftAssign: return Id.shrass;
case EXP.unsignedRightShiftAssign: return Id.ushrass;
case EXP.andAssign: return Id.andass;
case EXP.orAssign: return Id.orass;
case EXP.xorAssign: return Id.xorass;
case EXP.concatenateAssign: return Id.catass;
case EXP.equal: return Id.eq;
case EXP.lessThan:
case EXP.lessOrEqual:
case EXP.greaterThan:
case EXP.greaterOrEqual: return Id.cmp;
case EXP.array: return Id.index;
case EXP.star: return Id.opStar;
default: assert(0);
}
}
/***********************************
* Get Identifier for reverse operator overload,
* `null` if not supported for this operator.
*/
private Identifier opId_r(Expression e)
{
switch (e.op)
{
case EXP.in_: return Id.opIn_r;
case EXP.add: return Id.add_r;
case EXP.min: return Id.sub_r;
case EXP.mul: return Id.mul_r;
case EXP.div: return Id.div_r;
case EXP.mod: return Id.mod_r;
case EXP.pow: return Id.pow_r;
case EXP.leftShift: return Id.shl_r;
case EXP.rightShift: return Id.shr_r;
case EXP.unsignedRightShift:return Id.ushr_r;
case EXP.and: return Id.iand_r;
case EXP.or: return Id.ior_r;
case EXP.xor: return Id.ixor_r;
case EXP.concatenate: return Id.cat_r;
default: return null;
}
}
/*******************************************
* Helper function to turn operator into template argument list
*/
Objects* opToArg(Scope* sc, EXP op)
{
/* Remove the = from op=
*/
switch (op)
{
case EXP.addAssign:
op = EXP.add;
break;
case EXP.minAssign:
op = EXP.min;
break;
case EXP.mulAssign:
op = EXP.mul;
break;
case EXP.divAssign:
op = EXP.div;
break;
case EXP.modAssign:
op = EXP.mod;
break;
case EXP.andAssign:
op = EXP.and;
break;
case EXP.orAssign:
op = EXP.or;
break;
case EXP.xorAssign:
op = EXP.xor;
break;
case EXP.leftShiftAssign:
op = EXP.leftShift;
break;
case EXP.rightShiftAssign:
op = EXP.rightShift;
break;
case EXP.unsignedRightShiftAssign:
op = EXP.unsignedRightShift;
break;
case EXP.concatenateAssign:
op = EXP.concatenate;
break;
case EXP.powAssign:
op = EXP.pow;
break;
default:
break;
}
Expression e = new StringExp(Loc.initial, EXPtoString(op));
e = e.expressionSemantic(sc);
auto tiargs = new Objects();
tiargs.push(e);
return tiargs;
}
// Try alias this on first operand
private Expression checkAliasThisForLhs(AggregateDeclaration ad, Scope* sc, BinExp e)
{
if (!ad || !ad.aliasthis)
return null;
/* Rewrite (e1 op e2) as:
* (e1.aliasthis op e2)
*/
if (isRecursiveAliasThis(e.att1, e.e1.type))
return null;
//printf("att %s e1 = %s\n", Token.toChars(e.op), e.e1.type.toChars());
BinExp be = cast(BinExp)e.copy();
// Resolve 'alias this' but in case of assigment don't resolve properties yet
// because 'e1 = e2' could mean 'e1(e2)' or 'e1() = e2'
bool findOnly = (e.op == EXP.assign);
be.e1 = resolveAliasThis(sc, e.e1, true, findOnly);
if (!be.e1)
return null;
Expression result;
if (be.op == EXP.concatenateAssign)
result = be.op_overload(sc);
else
result = be.trySemantic(sc);
return result;
}
// Try alias this on second operand
private Expression checkAliasThisForRhs(AggregateDeclaration ad, Scope* sc, BinExp e)
{
if (!ad || !ad.aliasthis)
return null;
/* Rewrite (e1 op e2) as:
* (e1 op e2.aliasthis)
*/
if (isRecursiveAliasThis(e.att2, e.e2.type))
return null;
//printf("att %s e2 = %s\n", Token.toChars(e.op), e.e2.type.toChars());
BinExp be = cast(BinExp)e.copy();
be.e2 = resolveAliasThis(sc, e.e2, true);
if (!be.e2)
return null;
Expression result;
if (be.op == EXP.concatenateAssign)
result = be.op_overload(sc);
else
result = be.trySemantic(sc);
return result;
}
/************************************
* Operator overload.
* Check for operator overload, if so, replace
* with function call.
* Params:
* e = expression with operator
* sc = context
* pop = if not null, is set to the operator that was actually overloaded,
* which may not be `e.op`. Happens when operands are reversed to
* match an overload
* Returns:
* `null` if not an operator overload,
* otherwise the lowered expression
*/
Expression op_overload(Expression e, Scope* sc, EXP* pop = null)
{
Expression visit(Expression e)
{
assert(0);
}
Expression visitUna(UnaExp e)
{
//printf("UnaExp::op_overload() (%s)\n", e.toChars());
Expression result;
if (auto ae = e.e1.isArrayExp())
{
ae.e1 = ae.e1.expressionSemantic(sc);
ae.e1 = resolveProperties(sc, ae.e1);
Expression ae1old = ae.e1;
const(bool) maybeSlice = (ae.arguments.length == 0 || ae.arguments.length == 1 && (*ae.arguments)[0].op == EXP.interval);
IntervalExp ie = null;
if (maybeSlice && ae.arguments.length)
{
ie = (*ae.arguments)[0].isIntervalExp();
}
while (true)
{
if (ae.e1.op == EXP.error)
{
return ae.e1;
}
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 == EXP.error)
return result;
/* Rewrite op(a[arguments]) as:
* a.opIndexUnary!(op)(arguments)
*/
Expressions* a = 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.expressionSemantic(sc);
if (result)
{
return Expression.combine(e0, result);
}
}
Lfallback:
if (maybeSlice && search_function(ad, Id.opSliceUnary))
{
// Deal with $
result = resolveOpDollar(sc, ae, ie, &e0);
if (result.op == EXP.error)
return result;
/* Rewrite op(a[i..j]) as:
* a.opSliceUnary!(op)(i, j)
*/
auto 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.expressionSemantic(sc);
result = Expression.combine(e0, result);
return result;
}
// Didn't find it. Forward to aliasthis
if (ad.aliasthis && !isRecursiveAliasThis(ae.att1, ae.e1.type))
{
/* 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.expressionSemantic(sc);
e.e1 = resolveProperties(sc, e.e1);
if (e.e1.op == EXP.error)
{
return e.e1;
}
AggregateDeclaration ad = isAggregate(e.e1.type);
if (ad)
{
Dsymbol fd = null;
/* 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.expressionSemantic(sc);
return result;
}
// D1-style operator overloads, deprecated
if (e.op != EXP.prePlusPlus && e.op != EXP.preMinusMinus)
{
auto id = opId(e);
fd = search_function(ad, id);
if (fd)
{
// @@@DEPRECATED_2.110@@@.
// Deprecated in 2.088, made an error in 2.100
e.error("`%s` is obsolete. Use `opUnary(string op)() if (op == \"%s\")` instead.", id.toChars(), EXPtoString(e.op).ptr);
return ErrorExp.get();
}
}
// Didn't find it. Forward to aliasthis
if (ad.aliasthis && !isRecursiveAliasThis(e.att1, e.e1.type))
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
//printf("att una %s e1 = %s\n", EXPtoString(op).ptr, this.e1.type.toChars());
Expression e1 = new DotIdExp(e.loc, e.e1, ad.aliasthis.ident);
UnaExp ue = cast(UnaExp)e.copy();
ue.e1 = e1;
result = ue.trySemantic(sc);
return result;
}
}
return result;
}
Expression visitArray(ArrayExp ae)
{
//printf("ArrayExp::op_overload() (%s)\n", ae.toChars());
ae.e1 = ae.e1.expressionSemantic(sc);
ae.e1 = resolveProperties(sc, ae.e1);
Expression ae1old = ae.e1;
const(bool) maybeSlice = (ae.arguments.length == 0 || ae.arguments.length == 1 && (*ae.arguments)[0].op == EXP.interval);
IntervalExp ie = null;
if (maybeSlice && ae.arguments.length)
{
ie = (*ae.arguments)[0].isIntervalExp();
}
Expression result;
while (true)
{
if (ae.e1.op == EXP.error)
{
return ae.e1;
}
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 (isIndexableNonAggregate(t1b) || ae.e1.op == EXP.type)
{
// Convert to SliceExp
if (maybeSlice)
{
result = new SliceExp(ae.loc, ae.e1, ie);
result = result.expressionSemantic(sc);
return result;
}
// Convert to IndexExp
if (ae.arguments.length == 1)
{
result = new IndexExp(ae.loc, ae.e1, (*ae.arguments)[0]);
result = result.expressionSemantic(sc);
return result;
}
}
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 == EXP.error)
return result;
/* Rewrite e1[arguments] as:
* e1.opIndex(arguments)
*/
Expressions* a = 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.expressionSemantic(sc);
if (result)
{
return Expression.combine(e0, result);
}
}
Lfallback:
if (maybeSlice && ae.e1.op == EXP.type)
{
result = new SliceExp(ae.loc, ae.e1, ie);
result = result.expressionSemantic(sc);
result = Expression.combine(e0, result);
return result;
}
if (maybeSlice && search_function(ad, Id.slice))
{
// Deal with $
result = resolveOpDollar(sc, ae, ie, &e0);
if (result.op == EXP.error)
{
if (!e0 && !search_function(ad, Id.dollar)) {
ae.loc.errorSupplemental("Aggregate declaration '%s' does not define 'opDollar'", ae.e1.toChars());
}
return result;
}
/* Rewrite a[i..j] as:
* a.opSlice(i, j)
*/
auto 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.expressionSemantic(sc);
result = Expression.combine(e0, result);
return result;
}
// Didn't find it. Forward to aliasthis
if (ad.aliasthis && !isRecursiveAliasThis(ae.att1, ae.e1.type))
{
//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;
return result;
}
/***********************************************
* This is mostly the same as UnaryExp::op_overload(), but has
* a different rewrite.
*/
Expression visitCast(CastExp e)
{
//printf("CastExp::op_overload() (%s)\n", e.toChars());
Expression result;
AggregateDeclaration ad = isAggregate(e.e1.type);
if (ad)
{
Dsymbol fd = null;
/* Rewrite as:
* e1.opCast!(T)()
*/
fd = search_function(ad, Id._cast);
if (fd)
{
version (all)
{
// Backwards compatibility with D1 if opCast is a function, not a template
if (fd.isFuncDeclaration())
{
// Rewrite as: e1.opCast()
return build_overload(e.loc, sc, e.e1, null, fd);
}
}
auto 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.expressionSemantic(sc);
return result;
}
// Didn't find it. Forward to aliasthis
if (ad.aliasthis && !isRecursiveAliasThis(e.att1, e.e1.type))
{
/* Rewrite op(e1) as:
* op(e1.aliasthis)
*/
if (auto e1 = resolveAliasThis(sc, e.e1, true))
{
result = e.copy();
(cast(UnaExp)result).e1 = e1;
result = result.op_overload(sc);
return result;
}
}
}
return result;
}
Expression visitBin(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 == EXP.assign && ad1 == ad2)
{
StructDeclaration sd = ad1.isStructDeclaration();
if (sd &&
(!sd.hasIdentityAssign ||
/* Do a blit if we can and the rvalue is something like .init,
* where a postblit is not necessary.
*/
(sd.hasBlitAssign && !e.e2.isLvalue())))
{
/* This is bitwise struct assignment. */
return null;
}
}
Dsymbol s = null;
Dsymbol s_r = null;
Objects* tiargs = null;
if (e.op == EXP.plusPlus || e.op == EXP.minusMinus)
{
// Bug4099 fix
if (ad1 && search_function(ad1, Id.opUnary))
return null;
}
if (e.op != EXP.equal && e.op != EXP.notEqual && e.op != EXP.assign && e.op != EXP.plusPlus && e.op != EXP.minusMinus)
{
/* Try 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());
return ErrorExp.get();
}
}
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());
return ErrorExp.get();
}
if (s_r && s_r == s) // https://issues.dlang.org/show_bug.cgi?id=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 the D1-style operators, deprecated
if (ad1 && id)
{
s = search_function(ad1, id);
if (s && id != Id.assign)
{
// @@@DEPRECATED_2.110@@@.
// Deprecated in 2.088, made an error in 2.100
if (id == Id.postinc || id == Id.postdec)
e.error("`%s` is obsolete. Use `opUnary(string op)() if (op == \"%s\")` instead.", id.toChars(), EXPtoString(e.op).ptr);
else
e.error("`%s` is obsolete. Use `opBinary(string op)(...) if (op == \"%s\")` instead.", id.toChars(), EXPtoString(e.op).ptr);
return ErrorExp.get();
}
}
if (ad2 && id_r)
{
s_r = search_function(ad2, id_r);
// https://issues.dlang.org/show_bug.cgi?id=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;
if (s_r)
{
// @@@DEPRECATED_2.110@@@.
// Deprecated in 2.088, made an error in 2.100
e.error("`%s` is obsolete. Use `opBinaryRight(string op)(...) if (op == \"%s\")` instead.", id_r.toChars(), EXPtoString(e.op).ptr);
return ErrorExp.get();
}
}
}
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;
MatchAccumulator m;
if (s)
{
functionResolve(m, s, e.loc, sc, tiargs, e.e1.type, &args2);
if (m.lastf && (m.lastf.errors || m.lastf.hasSemantic3Errors()))
{
return ErrorExp.get();
}
}
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 || m.lastf.hasSemantic3Errors()))
{
return ErrorExp.get();
}
}
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 == MATCH.nomatch)
{
if (tiargs)
goto L1;
m.lastf = null;
}
if (e.op == EXP.plusPlus || e.op == EXP.minusMinus)
{
// 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()
return build_overload(e.loc, sc, e.e1, null, m.lastf ? m.lastf : s);
}
else if (lastf && m.lastf == lastf || !s_r && m.last == MATCH.nomatch)
{
// Rewrite (e1 op e2) as e1.opfunc(e2)
return build_overload(e.loc, sc, e.e1, e.e2, m.lastf ? m.lastf : s);
}
else
{
// Rewrite (e1 op e2) as e2.opfunc_r(e1)
return build_overload(e.loc, sc, e.e2, e.e1, m.lastf ? m.lastf : s_r);
}
}
L1:
version (all)
{
// 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) // https://issues.dlang.org/show_bug.cgi?id=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);
}
MatchAccumulator m;
if (s_r)
{
functionResolve(m, s_r, e.loc, sc, tiargs, e.e1.type, &args2);
if (m.lastf && (m.lastf.errors || m.lastf.hasSemantic3Errors()))
{
return ErrorExp.get();
}
}
FuncDeclaration lastf = m.lastf;
if (s)
{
functionResolve(m, s, e.loc, sc, tiargs, e.e2.type, &args1);
if (m.lastf && (m.lastf.errors || m.lastf.hasSemantic3Errors()))
{
return ErrorExp.get();
}
}
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 == MATCH.nomatch)
{
m.lastf = null;
}
if (lastf && m.lastf == lastf || !s && m.last == MATCH.nomatch)
{
// Rewrite (e1 op e2) as e1.opfunc_r(e2)
return build_overload(e.loc, sc, e.e1, e.e2, m.lastf ? m.lastf : s_r);
}
else
{
// Rewrite (e1 op e2) as e2.opfunc(e1)
Expression 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
if (pop)
*pop = reverseRelation(e.op);
return result;
}
}
}
}
Expression rewrittenLhs;
if (!(e.op == EXP.assign && ad2 && ad1 == ad2)) // https://issues.dlang.org/show_bug.cgi?id=2943
{
if (Expression result = checkAliasThisForLhs(ad1, sc, e))
{
/* https://issues.dlang.org/show_bug.cgi?id=19441
*
* alias this may not be used for partial assignment.
* If a struct has a single member which is aliased this
* directly or aliased to a ref getter function that returns
* the mentioned member, then alias this may be
* used since the object will be fully initialised.
* If the struct is nested, the context pointer is considered
* one of the members, hence the `ad1.fields.length == 2 && ad1.vthis`
* condition.
*/
if (result.op != EXP.assign)
return result; // i.e: Rewrote `e1 = e2` -> `e1(e2)`
auto ae = result.isAssignExp();
if (ae.e1.op != EXP.dotVariable)
return result; // i.e: Rewrote `e1 = e2` -> `e1() = e2`
auto dve = ae.e1.isDotVarExp();
if (auto ad = dve.var.isMember2())
{
// i.e: Rewrote `e1 = e2` -> `e1.some.var = e2`
// Ensure that `var` is the only field member in `ad`
if (ad.fields.length == 1 || (ad.fields.length == 2 && ad.vthis))
{
if (dve.var == ad.aliasthis.sym)
return result;
}
}
rewrittenLhs = ae.e1;
}
}
if (!(e.op == EXP.assign && ad1 && ad1 == ad2)) // https://issues.dlang.org/show_bug.cgi?id=2943
{
if (Expression result = checkAliasThisForRhs(ad2, sc, e))
return result;
}
if (rewrittenLhs)
{
e.error("cannot use `alias this` to partially initialize variable `%s` of type `%s`. Use `%s`",
e.e1.toChars(), ad1.toChars(), rewrittenLhs.toChars());
return ErrorExp.get();
}
return null;
}
Expression visitEqual(EqualExp e)
{
//printf("EqualExp::op_overload() (%s)\n", e.toChars());
Type t1 = e.e1.type.toBasetype();
Type t2 = e.e2.type.toBasetype();
/* Array equality is handled by expressionSemantic() potentially
* lowering to object.__equals(), which takes care of overloaded
* operators for the element types.
*/
if ((t1.ty == Tarray || t1.ty == Tsarray) &&
(t2.ty == Tarray || t2.ty == Tsarray))
{
return null;
}
/* Check for class equality with null literal or typeof(null).
*/
if (t1.ty == Tclass && e.e2.op == EXP.null_ ||
t2.ty == Tclass && e.e1.op == EXP.null_)
{
e.error("use `%s` instead of `%s` when comparing with `null`",
EXPtoString(e.op == EXP.equal ? EXP.identity : EXP.notIdentity).ptr,
EXPtoString(e.op).ptr);
return ErrorExp.get();
}
if (t1.ty == Tclass && t2.ty == Tnull ||
t1.ty == Tnull && t2.ty == Tclass)
{
// Comparing a class with typeof(null) should not call opEquals
return null;
}
/* Check for class equality.
*/
if (t1.ty == Tclass && t2.ty == Tclass)
{
ClassDeclaration cd1 = t1.isClassHandle();
ClassDeclaration cd2 = t2.isClassHandle();
if (!(cd1.classKind == ClassKind.cpp || cd2.classKind == ClassKind.cpp))
{
/* Rewrite as:
* .object.opEquals(e1, e2)
*/
if (!ClassDeclaration.object)
{
e.error("cannot compare classes for equality because `object.Object` was not declared");
return null;
}
Expression e1x = e.e1;
Expression e2x = e.e2;
/* The explicit cast is necessary for interfaces
* https://issues.dlang.org/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());
Expression 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);
if (e.op == EXP.notEqual)
result = new NotExp(e.loc, result);
result = result.expressionSemantic(sc);
return result;
}
}
if (Expression result = compare_overload(e, sc, Id.eq, null))
{
if (lastComma(result).op == EXP.call && e.op == EXP.notEqual)
{
result = new NotExp(result.loc, result);
result = result.expressionSemantic(sc);
}
return result;
}
/* Check for pointer equality.
*/
if (t1.ty == Tpointer || t2.ty == Tpointer)
{
/* Rewrite:
* ptr1 == ptr2
* as:
* ptr1 is ptr2
*
* This is just a rewriting for deterministic AST representation
* as the backend input.
*/
auto op2 = e.op == EXP.equal ? EXP.identity : EXP.notIdentity;
Expression r = new IdentityExp(op2, e.loc, e.e1, e.e2);
return r.expressionSemantic(sc);
}
/* Check for struct equality without opEquals.
*/
if (t1.ty == Tstruct && t2.ty == Tstruct)
{
auto sd = t1.isTypeStruct().sym;
if (sd != t2.isTypeStruct().sym)
return null;
import dmd.clone : needOpEquals;
if (!global.params.fieldwise && !needOpEquals(sd))