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opover.d
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opover.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://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.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.id;
import dmd.identifier;
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.
*/
extern (C++) bool isCommutative(TOK op)
{
switch (op)
{
case TOK.add:
case TOK.mul:
case TOK.and:
case TOK.or:
case TOK.xor:
// EqualExp
case TOK.equal:
case TOK.notEqual:
// CmpExp
case TOK.lessThan:
case TOK.lessOrEqual:
case TOK.greaterThan:
case TOK.greaterOrEqual:
return true;
default:
break;
}
return false;
}
/***********************************
* Get Identifier for operator overload.
*/
private Identifier opId(Expression e)
{
extern (C++) final class OpIdVisitor : Visitor
{
alias visit = Visitor.visit;
public:
Identifier id;
override void visit(Expression e)
{
assert(0);
}
override void visit(UAddExp e)
{
id = Id.uadd;
}
override void visit(NegExp e)
{
id = Id.neg;
}
override void visit(ComExp e)
{
id = Id.com;
}
override void visit(CastExp e)
{
id = Id._cast;
}
override void visit(InExp e)
{
id = Id.opIn;
}
override void visit(PostExp e)
{
id = (e.op == TOK.plusPlus) ? Id.postinc : Id.postdec;
}
override void visit(AddExp e)
{
id = Id.add;
}
override void visit(MinExp e)
{
id = Id.sub;
}
override void visit(MulExp e)
{
id = Id.mul;
}
override void visit(DivExp e)
{
id = Id.div;
}
override void visit(ModExp e)
{
id = Id.mod;
}
override void visit(PowExp e)
{
id = Id.pow;
}
override void visit(ShlExp e)
{
id = Id.shl;
}
override void visit(ShrExp e)
{
id = Id.shr;
}
override void visit(UshrExp e)
{
id = Id.ushr;
}
override void visit(AndExp e)
{
id = Id.iand;
}
override void visit(OrExp e)
{
id = Id.ior;
}
override void visit(XorExp e)
{
id = Id.ixor;
}
override void visit(CatExp e)
{
id = Id.cat;
}
override void visit(AssignExp e)
{
id = Id.assign;
}
override void visit(AddAssignExp e)
{
id = Id.addass;
}
override void visit(MinAssignExp e)
{
id = Id.subass;
}
override void visit(MulAssignExp e)
{
id = Id.mulass;
}
override void visit(DivAssignExp e)
{
id = Id.divass;
}
override void visit(ModAssignExp e)
{
id = Id.modass;
}
override void visit(AndAssignExp e)
{
id = Id.andass;
}
override void visit(OrAssignExp e)
{
id = Id.orass;
}
override void visit(XorAssignExp e)
{
id = Id.xorass;
}
override void visit(ShlAssignExp e)
{
id = Id.shlass;
}
override void visit(ShrAssignExp e)
{
id = Id.shrass;
}
override void visit(UshrAssignExp e)
{
id = Id.ushrass;
}
override void visit(CatAssignExp e)
{
id = Id.catass;
}
override void visit(PowAssignExp e)
{
id = Id.powass;
}
override void visit(EqualExp e)
{
id = Id.eq;
}
override void visit(CmpExp e)
{
id = Id.cmp;
}
override void visit(ArrayExp e)
{
id = Id.index;
}
override void visit(PtrExp e)
{
id = Id.opStar;
}
}
scope OpIdVisitor v = new OpIdVisitor();
e.accept(v);
return v.id;
}
/***********************************
* Get Identifier for reverse operator overload,
* NULL if not supported for this operator.
*/
private Identifier opId_r(Expression e)
{
extern (C++) final class OpIdRVisitor : Visitor
{
alias visit = Visitor.visit;
public:
Identifier id;
override void visit(Expression e)
{
id = null;
}
override void visit(InExp e)
{
id = Id.opIn_r;
}
override void visit(AddExp e)
{
id = Id.add_r;
}
override void visit(MinExp e)
{
id = Id.sub_r;
}
override void visit(MulExp e)
{
id = Id.mul_r;
}
override void visit(DivExp e)
{
id = Id.div_r;
}
override void visit(ModExp e)
{
id = Id.mod_r;
}
override void visit(PowExp e)
{
id = Id.pow_r;
}
override void visit(ShlExp e)
{
id = Id.shl_r;
}
override void visit(ShrExp e)
{
id = Id.shr_r;
}
override void visit(UshrExp e)
{
id = Id.ushr_r;
}
override void visit(AndExp e)
{
id = Id.iand_r;
}
override void visit(OrExp e)
{
id = Id.ior_r;
}
override void visit(XorExp e)
{
id = Id.ixor_r;
}
override void visit(CatExp e)
{
id = Id.cat_r;
}
}
scope OpIdRVisitor v = new OpIdRVisitor();
e.accept(v);
return v.id;
}
/************************************
* If type is a class or struct, return the symbol for it,
* else NULL
*/
extern (C++) AggregateDeclaration isAggregate(Type t)
{
t = t.toBasetype();
if (t.ty == Tclass)
{
return (cast(TypeClass)t).sym;
}
else if (t.ty == Tstruct)
{
return (cast(TypeStruct)t).sym;
}
return null;
}
/*******************************************
* Helper function to turn operator into template argument list
*/
extern (C++) Objects* opToArg(Scope* sc, TOK op)
{
/* Remove the = from op=
*/
switch (op)
{
case TOK.addAssign:
op = TOK.add;
break;
case TOK.minAssign:
op = TOK.min;
break;
case TOK.mulAssign:
op = TOK.mul;
break;
case TOK.divAssign:
op = TOK.div;
break;
case TOK.modAssign:
op = TOK.mod;
break;
case TOK.andAssign:
op = TOK.and;
break;
case TOK.orAssign:
op = TOK.or;
break;
case TOK.xorAssign:
op = TOK.xor;
break;
case TOK.leftShiftAssign:
op = TOK.leftShift;
break;
case TOK.rightShiftAssign:
op = TOK.rightShift;
break;
case TOK.unsignedRightShiftAssign:
op = TOK.unsignedRightShift;
break;
case TOK.concatenateAssign:
op = TOK.concatenate;
break;
case TOK.powAssign:
op = TOK.pow;
break;
default:
break;
}
Expression e = new StringExp(Loc.initial, cast(char*)Token.toChars(op));
e = e.expressionSemantic(sc);
auto 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.
*/
extern (C++) Expression op_overload(Expression e, Scope* sc)
{
extern (C++) final class OpOverload : Visitor
{
alias visit = Visitor.visit;
public:
Scope* sc;
Expression result;
extern (D) this(Scope* sc)
{
this.sc = sc;
}
override void visit(Expression e)
{
assert(0);
}
override void visit(UnaExp e)
{
//printf("UnaExp::op_overload() (%s)\n", e.toChars());
if (e.e1.op == TOK.array)
{
ArrayExp ae = cast(ArrayExp)e.e1;
ae.e1 = ae.e1.expressionSemantic(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 == TOK.interval);
IntervalExp ie = null;
if (maybeSlice && ae.arguments.dim)
{
assert((*ae.arguments)[0].op == TOK.interval);
ie = cast(IntervalExp)(*ae.arguments)[0];
}
while (true)
{
if (ae.e1.op == TOK.error)
{
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 == TOK.error)
return;
/* 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)
{
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 == TOK.error)
return;
/* 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;
}
// 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.expressionSemantic(sc);
e.e1 = resolveProperties(sc, e.e1);
if (e.e1.op == TOK.error)
{
result = e.e1;
return;
}
AggregateDeclaration ad = isAggregate(e.e1.type);
if (ad)
{
Dsymbol fd = null;
version (all)
{
// Old way, kept for compatibility with D1
if (e.op != TOK.prePlusPlus && e.op != TOK.preMinusMinus)
{
fd = search_function(ad, opId(e));
if (fd)
{
// Rewrite +e1 as e1.add()
result = build_overload(e.loc, sc, e.e1, null, fd);
return;
}
}
}
/* 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;
}
// 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 = cast(UnaExp)e.copy();
if (!ue.att1 && e.e1.type.checkAliasThisRec())
ue.att1 = e.e1.type;
ue.e1 = e1;
result = ue.trySemantic(sc);
return;
}
}
}
override void visit(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.dim == 0 || ae.arguments.dim == 1 && (*ae.arguments)[0].op == TOK.interval);
IntervalExp ie = null;
if (maybeSlice && ae.arguments.dim)
{
assert((*ae.arguments)[0].op == TOK.interval);
ie = cast(IntervalExp)(*ae.arguments)[0];
}
while (true)
{
if (ae.e1.op == TOK.error)
{
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 || t1b.ty == Tvector || ae.e1.op == TOK.type)
{
// Convert to SliceExp
if (maybeSlice)
{
result = new SliceExp(ae.loc, ae.e1, ie);
result = result.expressionSemantic(sc);
return;
}
// Convert to IndexExp
if (ae.arguments.dim == 1)
{
result = new IndexExp(ae.loc, ae.e1, (*ae.arguments)[0]);
result = result.expressionSemantic(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 == TOK.error)
return;
/* 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)
{
result = Expression.combine(e0, result);
return;
}
}
Lfallback:
if (maybeSlice && ae.e1.op == TOK.type)
{
result = new SliceExp(ae.loc, ae.e1, ie);
result = result.expressionSemantic(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 == TOK.error)
return;
/* 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;
}
// 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.
*/
override 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)
{
version (all)
{
// 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;
}
}
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;
}
// 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();
(cast(UnaExp)result).e1 = e1;
result = result.trySemantic(sc);
return;
}
}
}
override 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 == TOK.assign && ad1 == ad2)
{
StructDeclaration sd = ad1.isStructDeclaration();
if (sd && !sd.hasIdentityAssign)
{
/* This is bitwise struct assignment. */
return;
}
}
Dsymbol s = null;
Dsymbol s_r = null;
version (all)
{
// the old D1 scheme
if (ad1 && id)
{
s = search_function(ad1, id);
}
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;
}
}
Objects* tiargs = null;
if (e.op == TOK.plusPlus || e.op == TOK.minusMinus)
{
// Bug4099 fix
if (ad1 && search_function(ad1, Id.opUnary))
return;
}
if (!s && !s_r && e.op != TOK.equal && e.op != TOK.notEqual && e.op != TOK.assign && e.op != TOK.plusPlus && e.op != TOK.minusMinus)
{
/* 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) // 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:
* 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;
m.last = MATCH.nomatch;
if (s)
{
functionResolve(&m, s, e.loc, sc, tiargs, e.e1.type, &args2);
if (m.lastf && (m.lastf.errors || m.lastf.semantic3Errors))
{
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 || m.lastf.semantic3Errors))
{
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 <= MATCH.nomatch)
{
m.lastf = m.anyf;
if (tiargs)
goto L1;
}
if (e.op == TOK.plusPlus || e.op == TOK.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()
result = 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)
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:
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);
}
Match m;
m.last = MATCH.nomatch;
if (s_r)
{
functionResolve(&m, s_r, e.loc, sc, tiargs, e.e1.type, &args2);
if (m.lastf && (m.lastf.errors || m.lastf.semantic3Errors))
{
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 || m.lastf.semantic3Errors))
{
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 <= MATCH.nomatch)
{
m.lastf = m.anyf;
}
if (lastf && m.lastf == lastf || !s && m.last <= MATCH.nomatch)
{
// 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);
}