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typesem.d
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typesem.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2020 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/typesem.d, _typesem.d)
* Documentation: https://dlang.org/phobos/dmd_typesem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/typesem.d
*/
module dmd.typesem;
import core.checkedint;
import core.stdc.string;
import core.stdc.stdio;
import dmd.access;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.astcodegen;
import dmd.complex;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dimport;
import dmd.dmangle;
import dmd.dmodule : Module;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dsymbolsem;
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.imphint;
import dmd.init;
import dmd.initsem;
import dmd.visitor;
import dmd.mtype;
import dmd.objc;
import dmd.opover;
import dmd.parse;
import dmd.root.ctfloat;
import dmd.root.rmem;
import dmd.root.outbuffer;
import dmd.root.rootobject;
import dmd.root.string;
import dmd.root.stringtable;
import dmd.semantic3;
import dmd.sideeffect;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
/**************************
* This evaluates exp while setting length to be the number
* of elements in the tuple t.
*/
private Expression semanticLength(Scope* sc, Type t, Expression exp)
{
if (auto tt = t.isTypeTuple())
{
ScopeDsymbol sym = new ArrayScopeSymbol(sc, tt);
sym.parent = sc.scopesym;
sc = sc.push(sym);
sc = sc.startCTFE();
exp = exp.expressionSemantic(sc);
sc = sc.endCTFE();
sc.pop();
}
else
{
sc = sc.startCTFE();
exp = exp.expressionSemantic(sc);
sc = sc.endCTFE();
}
return exp;
}
private Expression semanticLength(Scope* sc, TupleDeclaration tup, Expression exp)
{
ScopeDsymbol sym = new ArrayScopeSymbol(sc, tup);
sym.parent = sc.scopesym;
sc = sc.push(sym);
sc = sc.startCTFE();
exp = exp.expressionSemantic(sc);
sc = sc.endCTFE();
sc.pop();
return exp;
}
/*************************************
* Resolve a tuple index.
*/
private void resolveTupleIndex(const ref Loc loc, Scope* sc, Dsymbol s, Expression* pe, Type* pt, Dsymbol* ps, RootObject oindex)
{
*pt = null;
*ps = null;
*pe = null;
auto tup = s.isTupleDeclaration();
auto eindex = isExpression(oindex);
auto tindex = isType(oindex);
auto sindex = isDsymbol(oindex);
if (!tup)
{
// It's really an index expression
if (tindex)
eindex = new TypeExp(loc, tindex);
else if (sindex)
eindex = symbolToExp(sindex, loc, sc, false);
Expression e = new IndexExp(loc, symbolToExp(s, loc, sc, false), eindex);
e = e.expressionSemantic(sc);
resolveExp(e, pt, pe, ps);
return;
}
// Convert oindex to Expression, then try to resolve to constant.
if (tindex)
tindex.resolve(loc, sc, &eindex, &tindex, &sindex);
if (sindex)
eindex = symbolToExp(sindex, loc, sc, false);
if (!eindex)
{
.error(loc, "index `%s` is not an expression", oindex.toChars());
*pt = Type.terror;
return;
}
eindex = semanticLength(sc, tup, eindex);
eindex = eindex.ctfeInterpret();
if (eindex.op == TOK.error)
{
*pt = Type.terror;
return;
}
const(uinteger_t) d = eindex.toUInteger();
if (d >= tup.objects.dim)
{
.error(loc, "tuple index `%llu` exceeds length %u", d, tup.objects.dim);
*pt = Type.terror;
return;
}
RootObject o = (*tup.objects)[cast(size_t)d];
*pt = isType(o);
*ps = isDsymbol(o);
*pe = isExpression(o);
if (*pt)
*pt = (*pt).typeSemantic(loc, sc);
if (*pe)
resolveExp(*pe, pt, pe, ps);
}
/*************************************
* Takes an array of Identifiers and figures out if
* it represents a Type, Expression, or Dsymbol.
* Params:
* mt = array of identifiers
* loc = location for error messages
* sc = context
* s = symbol to start search at
* scopesym = unused
* pe = set if expression
* pt = set if type
* ps = set if symbol
* typeid = set if in TypeidExpression https://dlang.org/spec/expression.html#TypeidExpression
*/
private void resolveHelper(TypeQualified mt, const ref Loc loc, Scope* sc, Dsymbol s, Dsymbol scopesym,
Expression* pe, Type* pt, Dsymbol* ps, bool intypeid = false)
{
version (none)
{
printf("TypeQualified::resolveHelper(sc = %p, idents = '%s')\n", sc, mt.toChars());
if (scopesym)
printf("\tscopesym = '%s'\n", scopesym.toChars());
}
*pe = null;
*pt = null;
*ps = null;
if (!s)
{
/* Look for what user might have intended
*/
const p = mt.mutableOf().unSharedOf().toChars();
auto id = Identifier.idPool(p, cast(uint)strlen(p));
if (const n = importHint(id.toString()))
error(loc, "`%s` is not defined, perhaps `import %.*s;` ?", p, cast(int)n.length, n.ptr);
else if (auto s2 = sc.search_correct(id))
error(loc, "undefined identifier `%s`, did you mean %s `%s`?", p, s2.kind(), s2.toChars());
else if (const q = Scope.search_correct_C(id))
error(loc, "undefined identifier `%s`, did you mean `%s`?", p, q);
else
error(loc, "undefined identifier `%s`", p);
*pt = Type.terror;
return;
}
//printf("\t1: s = '%s' %p, kind = '%s'\n",s.toChars(), s, s.kind());
Declaration d = s.isDeclaration();
if (d && (d.storage_class & STC.templateparameter))
s = s.toAlias();
else
{
// check for deprecated or disabled aliases
s.checkDeprecated(loc, sc);
if (d)
d.checkDisabled(loc, sc, true);
}
s = s.toAlias();
//printf("\t2: s = '%s' %p, kind = '%s'\n",s.toChars(), s, s.kind());
for (size_t i = 0; i < mt.idents.dim; i++)
{
RootObject id = mt.idents[i];
if (id.dyncast() == DYNCAST.expression ||
id.dyncast() == DYNCAST.type)
{
Type tx;
Expression ex;
Dsymbol sx;
resolveTupleIndex(loc, sc, s, &ex, &tx, &sx, id);
if (sx)
{
s = sx.toAlias();
continue;
}
if (tx)
ex = new TypeExp(loc, tx);
assert(ex);
ex = typeToExpressionHelper(mt, ex, i + 1);
ex = ex.expressionSemantic(sc);
resolveExp(ex, pt, pe, ps);
return;
}
Type t = s.getType(); // type symbol, type alias, or type tuple?
uint errorsave = global.errors;
int flags = t is null ? SearchLocalsOnly : IgnorePrivateImports;
Dsymbol sm = s.searchX(loc, sc, id, flags);
if (sm && !(sc.flags & SCOPE.ignoresymbolvisibility) && !symbolIsVisible(sc, sm))
{
.error(loc, "`%s` is not visible from module `%s`", sm.toPrettyChars(), sc._module.toChars());
sm = null;
}
if (global.errors != errorsave)
{
*pt = Type.terror;
return;
}
void helper3()
{
Expression e;
VarDeclaration v = s.isVarDeclaration();
FuncDeclaration f = s.isFuncDeclaration();
if (intypeid || !v && !f)
e = symbolToExp(s, loc, sc, true);
else
e = new VarExp(loc, s.isDeclaration(), true);
e = typeToExpressionHelper(mt, e, i);
e = e.expressionSemantic(sc);
resolveExp(e, pt, pe, ps);
}
//printf("\t3: s = %p %s %s, sm = %p\n", s, s.kind(), s.toChars(), sm);
if (intypeid && !t && sm && sm.needThis())
return helper3();
if (VarDeclaration v = s.isVarDeclaration())
{
// https://issues.dlang.org/show_bug.cgi?id=19913
// v.type would be null if it is a forward referenced member.
if (v.type is null)
v.dsymbolSemantic(sc);
if (v.storage_class & (STC.const_ | STC.immutable_ | STC.manifest) ||
v.type.isConst() || v.type.isImmutable())
{
// https://issues.dlang.org/show_bug.cgi?id=13087
// this.field is not constant always
if (!v.isThisDeclaration())
return helper3();
}
}
if (!sm)
{
if (!t)
{
if (s.isDeclaration()) // var, func, or tuple declaration?
{
t = s.isDeclaration().type;
if (!t && s.isTupleDeclaration()) // expression tuple?
return helper3();
}
else if (s.isTemplateInstance() ||
s.isImport() || s.isPackage() || s.isModule())
{
return helper3();
}
}
if (t)
{
sm = t.toDsymbol(sc);
if (sm && id.dyncast() == DYNCAST.identifier)
{
sm = sm.search(loc, cast(Identifier)id, IgnorePrivateImports);
if (!sm)
return helper3();
}
else
return helper3();
}
else
{
if (id.dyncast() == DYNCAST.dsymbol)
{
// searchX already handles errors for template instances
assert(global.errors);
}
else
{
assert(id.dyncast() == DYNCAST.identifier);
sm = s.search_correct(cast(Identifier)id);
if (sm)
error(loc, "identifier `%s` of `%s` is not defined, did you mean %s `%s`?", id.toChars(), mt.toChars(), sm.kind(), sm.toChars());
else
error(loc, "identifier `%s` of `%s` is not defined", id.toChars(), mt.toChars());
}
*pe = new ErrorExp();
return;
}
}
s = sm.toAlias();
}
if (auto em = s.isEnumMember())
{
// It's not a type, it's an expression
*pe = em.getVarExp(loc, sc);
return;
}
if (auto v = s.isVarDeclaration())
{
/* This is mostly same with DsymbolExp::semantic(), but we cannot use it
* because some variables used in type context need to prevent lowering
* to a literal or contextful expression. For example:
*
* enum a = 1; alias b = a;
* template X(alias e){ alias v = e; } alias x = X!(1);
* struct S { int v; alias w = v; }
* // TypeIdentifier 'a', 'e', and 'v' should be TOK.variable,
* // because getDsymbol() need to work in AliasDeclaration::semantic().
*/
if (!v.type ||
!v.type.deco && v.inuse)
{
if (v.inuse) // https://issues.dlang.org/show_bug.cgi?id=9494
error(loc, "circular reference to %s `%s`", v.kind(), v.toPrettyChars());
else
error(loc, "forward reference to %s `%s`", v.kind(), v.toPrettyChars());
*pt = Type.terror;
return;
}
if (v.type.ty == Terror)
*pt = Type.terror;
else
*pe = new VarExp(loc, v);
return;
}
if (auto fld = s.isFuncLiteralDeclaration())
{
//printf("'%s' is a function literal\n", fld.toChars());
*pe = new FuncExp(loc, fld);
*pe = (*pe).expressionSemantic(sc);
return;
}
version (none)
{
if (FuncDeclaration fd = s.isFuncDeclaration())
{
*pe = new DsymbolExp(loc, fd);
return;
}
}
Type t;
while (1)
{
t = s.getType();
if (t)
break;
// If the symbol is an import, try looking inside the import
if (Import si = s.isImport())
{
s = si.search(loc, s.ident);
if (s && s != si)
continue;
s = si;
}
*ps = s;
return;
}
if (auto ti = t.isTypeInstance())
if (ti != mt && !ti.deco)
{
if (!ti.tempinst.errors)
error(loc, "forward reference to `%s`", ti.toChars());
*pt = Type.terror;
return;
}
if (t.ty == Ttuple)
*pt = t;
else
*pt = t.merge();
}
/************************************
* Transitively search a type for all function types.
* If any function types with parameters are found that have parameter identifiers
* or default arguments, remove those and create a new type stripped of those.
* This is used to determine the "canonical" version of a type which is useful for
* comparisons.
* Params:
* t = type to scan
* Returns:
* `t` if no parameter identifiers or default arguments found, otherwise a new type that is
* the same as t but with no parameter identifiers or default arguments.
*/
private Type stripDefaultArgs(Type t)
{
static Parameters* stripParams(Parameters* parameters)
{
static Parameter stripParameter(Parameter p)
{
Type t = stripDefaultArgs(p.type);
return (t != p.type || p.defaultArg || p.ident || p.userAttribDecl)
? new Parameter(p.storageClass, t, null, null, null)
: null;
}
if (parameters)
{
foreach (i, p; *parameters)
{
Parameter ps = stripParameter(p);
if (ps)
{
// Replace params with a copy we can modify
Parameters* nparams = new Parameters(parameters.dim);
foreach (j, ref np; *nparams)
{
Parameter pj = (*parameters)[j];
if (j < i)
np = pj;
else if (j == i)
np = ps;
else
{
Parameter nps = stripParameter(pj);
np = nps ? nps : pj;
}
}
return nparams;
}
}
}
return parameters;
}
if (t is null)
return t;
if (auto tf = t.isTypeFunction())
{
Type tret = stripDefaultArgs(tf.next);
Parameters* params = stripParams(tf.parameterList.parameters);
if (tret == tf.next && params == tf.parameterList.parameters)
return t;
TypeFunction tr = cast(TypeFunction)tf.copy();
tr.parameterList.parameters = params;
tr.next = tret;
//printf("strip %s\n <- %s\n", tr.toChars(), t.toChars());
return tr;
}
else if (auto tt = t.isTypeTuple())
{
Parameters* args = stripParams(tt.arguments);
if (args == tt.arguments)
return t;
TypeTuple tr = cast(TypeTuple)t.copy();
tr.arguments = args;
return tr;
}
else if (t.ty == Tenum)
{
// TypeEnum::nextOf() may be != NULL, but it's not necessary here.
return t;
}
else
{
Type tn = t.nextOf();
Type n = stripDefaultArgs(tn);
if (n == tn)
return t;
TypeNext tr = cast(TypeNext)t.copy();
tr.next = n;
return tr;
}
}
/******************************************
* We've mistakenly parsed `t` as a type.
* Redo `t` as an Expression.
* Params:
* t = mistaken type
* Returns:
* t redone as Expression, null if cannot
*/
Expression typeToExpression(Type t)
{
static Expression visitSArray(TypeSArray t)
{
if (auto e = t.next.typeToExpression())
return new ArrayExp(t.dim.loc, e, t.dim);
return null;
}
static Expression visitAArray(TypeAArray t)
{
if (auto e = t.next.typeToExpression())
{
if (auto ei = t.index.typeToExpression())
return new ArrayExp(t.loc, e, ei);
}
return null;
}
static Expression visitIdentifier(TypeIdentifier t)
{
return typeToExpressionHelper(t, new IdentifierExp(t.loc, t.ident));
}
static Expression visitInstance(TypeInstance t)
{
return typeToExpressionHelper(t, new ScopeExp(t.loc, t.tempinst));
}
// easy way to enable 'auto v = new int[mixin("exp")];' in 2.088+
static Expression visitMixin(TypeMixin t)
{
return new TypeExp(t.loc, t);
}
switch (t.ty)
{
case Tsarray: return visitSArray(cast(TypeSArray) t);
case Taarray: return visitAArray(cast(TypeAArray) t);
case Tident: return visitIdentifier(cast(TypeIdentifier) t);
case Tinstance: return visitInstance(cast(TypeInstance) t);
case Tmixin: return visitMixin(cast(TypeMixin) t);
default: return null;
}
}
/* Helper function for `typeToExpression`. Contains common code
* for TypeQualified derived classes.
*/
Expression typeToExpressionHelper(TypeQualified t, Expression e, size_t i = 0)
{
//printf("toExpressionHelper(e = %s %s)\n", Token.toChars(e.op), e.toChars());
foreach (id; t.idents[i .. t.idents.dim])
{
//printf("\t[%d] e: '%s', id: '%s'\n", i, e.toChars(), id.toChars());
final switch (id.dyncast())
{
// ... '. ident'
case DYNCAST.identifier:
e = new DotIdExp(e.loc, e, cast(Identifier)id);
break;
// ... '. name!(tiargs)'
case DYNCAST.dsymbol:
auto ti = (cast(Dsymbol)id).isTemplateInstance();
assert(ti);
e = new DotTemplateInstanceExp(e.loc, e, ti.name, ti.tiargs);
break;
// ... '[type]'
case DYNCAST.type: // https://issues.dlang.org/show_bug.cgi?id=1215
e = new ArrayExp(t.loc, e, new TypeExp(t.loc, cast(Type)id));
break;
// ... '[expr]'
case DYNCAST.expression: // https://issues.dlang.org/show_bug.cgi?id=1215
e = new ArrayExp(t.loc, e, cast(Expression)id);
break;
case DYNCAST.object:
case DYNCAST.tuple:
case DYNCAST.parameter:
case DYNCAST.statement:
case DYNCAST.condition:
case DYNCAST.templateparameter:
assert(0);
}
}
return e;
}
/******************************************
* Perform semantic analysis on a type.
* Params:
* t = Type AST node
* loc = the location of the type
* sc = context
* Returns:
* `Type` with completed semantic analysis, `Terror` if errors
* were encountered
*/
extern(C++) Type typeSemantic(Type t, Loc loc, Scope* sc)
{
static Type error()
{
return Type.terror;
}
Type visitType(Type t)
{
if (t.ty == Tint128 || t.ty == Tuns128)
{
.error(loc, "`cent` and `ucent` types not implemented");
return error();
}
return t.merge();
}
Type visitVector(TypeVector mtype)
{
const errors = global.errors;
mtype.basetype = mtype.basetype.typeSemantic(loc, sc);
if (errors != global.errors)
return error();
mtype.basetype = mtype.basetype.toBasetype().mutableOf();
if (mtype.basetype.ty != Tsarray)
{
.error(loc, "T in __vector(T) must be a static array, not `%s`", mtype.basetype.toChars());
return error();
}
TypeSArray t = cast(TypeSArray)mtype.basetype;
const sz = cast(int)t.size(loc);
final switch (target.isVectorTypeSupported(sz, t.nextOf()))
{
case 0:
// valid
break;
case 1:
// no support at all
.error(loc, "SIMD vector types not supported on this platform");
return error();
case 2:
// invalid base type
.error(loc, "vector type `%s` is not supported on this platform", mtype.toChars());
return error();
case 3:
// invalid size
.error(loc, "%d byte vector type `%s` is not supported on this platform", sz, mtype.toChars());
return error();
}
return merge(mtype);
}
Type visitSArray(TypeSArray mtype)
{
//printf("TypeSArray::semantic() %s\n", toChars());
Type t;
Expression e;
Dsymbol s;
mtype.next.resolve(loc, sc, &e, &t, &s);
if (auto tup = s ? s.isTupleDeclaration() : null)
{
mtype.dim = semanticLength(sc, tup, mtype.dim);
mtype.dim = mtype.dim.ctfeInterpret();
if (mtype.dim.op == TOK.error)
return error();
uinteger_t d = mtype.dim.toUInteger();
if (d >= tup.objects.dim)
{
.error(loc, "tuple index %llu exceeds %llu", cast(ulong)d, cast(ulong)tup.objects.dim);
return error();
}
RootObject o = (*tup.objects)[cast(size_t)d];
if (o.dyncast() != DYNCAST.type)
{
.error(loc, "`%s` is not a type", mtype.toChars());
return error();
}
return (cast(Type)o).addMod(mtype.mod);
}
Type tn = mtype.next.typeSemantic(loc, sc);
if (tn.ty == Terror)
return error();
Type tbn = tn.toBasetype();
if (mtype.dim)
{
//https://issues.dlang.org/show_bug.cgi?id=15478
if (mtype.dim.isDotVarExp())
{
if (Declaration vd = mtype.dim.isDotVarExp().var)
{
FuncDeclaration fd = vd.toAlias().isFuncDeclaration();
if (fd)
mtype.dim = new CallExp(loc, fd, null);
}
}
auto errors = global.errors;
mtype.dim = semanticLength(sc, tbn, mtype.dim);
if (errors != global.errors)
return error();
mtype.dim = mtype.dim.optimize(WANTvalue);
mtype.dim = mtype.dim.ctfeInterpret();
if (mtype.dim.op == TOK.error)
return error();
errors = global.errors;
dinteger_t d1 = mtype.dim.toInteger();
if (errors != global.errors)
return error();
mtype.dim = mtype.dim.implicitCastTo(sc, Type.tsize_t);
mtype.dim = mtype.dim.optimize(WANTvalue);
if (mtype.dim.op == TOK.error)
return error();
errors = global.errors;
dinteger_t d2 = mtype.dim.toInteger();
if (errors != global.errors)
return error();
if (mtype.dim.op == TOK.error)
return error();
Type overflowError()
{
.error(loc, "`%s` size %llu * %llu exceeds 0x%llx size limit for static array",
mtype.toChars(), cast(ulong)tbn.size(loc), cast(ulong)d1, target.maxStaticDataSize);
return error();
}
if (d1 != d2)
return overflowError();
Type tbx = tbn.baseElemOf();
if (tbx.ty == Tstruct && !(cast(TypeStruct)tbx).sym.members ||
tbx.ty == Tenum && !(cast(TypeEnum)tbx).sym.members)
{
/* To avoid meaningless error message, skip the total size limit check
* when the bottom of element type is opaque.
*/
}
else if (tbn.isTypeBasic() ||
tbn.ty == Tpointer ||
tbn.ty == Tarray ||
tbn.ty == Tsarray ||
tbn.ty == Taarray ||
(tbn.ty == Tstruct && ((cast(TypeStruct)tbn).sym.sizeok == Sizeok.done)) ||
tbn.ty == Tclass)
{
/* Only do this for types that don't need to have semantic()
* run on them for the size, since they may be forward referenced.
*/
bool overflow = false;
if (mulu(tbn.size(loc), d2, overflow) >= target.maxStaticDataSize || overflow)
return overflowError();
}
}
switch (tbn.ty)
{
case Ttuple:
{
// Index the tuple to get the type
assert(mtype.dim);
TypeTuple tt = cast(TypeTuple)tbn;
uinteger_t d = mtype.dim.toUInteger();
if (d >= tt.arguments.dim)
{
.error(loc, "tuple index %llu exceeds %llu", cast(ulong)d, cast(ulong)tt.arguments.dim);
return error();
}
Type telem = (*tt.arguments)[cast(size_t)d].type;
return telem.addMod(mtype.mod);
}
case Tfunction:
case Tnone:
.error(loc, "cannot have array of `%s`", tbn.toChars());
return error();
default:
break;
}
if (tbn.isscope())
{
.error(loc, "cannot have array of scope `%s`", tbn.toChars());
return error();
}
/* Ensure things like const(immutable(T)[3]) become immutable(T[3])
* and const(T)[3] become const(T[3])
*/
mtype.next = tn;
mtype.transitive();
return mtype.addMod(tn.mod).merge();
}
Type visitDArray(TypeDArray mtype)
{
Type tn = mtype.next.typeSemantic(loc, sc);
Type tbn = tn.toBasetype();
switch (tbn.ty)
{
case Ttuple:
return tbn;
case Tfunction:
case Tnone:
.error(loc, "cannot have array of `%s`", tbn.toChars());
return error();
case Terror:
return error();
default:
break;
}
if (tn.isscope())
{
.error(loc, "cannot have array of scope `%s`", tn.toChars());
return error();
}
mtype.next = tn;
mtype.transitive();
return merge(mtype);
}
Type visitAArray(TypeAArray mtype)
{
//printf("TypeAArray::semantic() %s index.ty = %d\n", mtype.toChars(), mtype.index.ty);
if (mtype.deco)
{
return mtype;
}
mtype.loc = loc;
mtype.sc = sc;
if (sc)
sc.setNoFree();
// Deal with the case where we thought the index was a type, but
// in reality it was an expression.
if (mtype.index.ty == Tident || mtype.index.ty == Tinstance || mtype.index.ty == Tsarray || mtype.index.ty == Ttypeof || mtype.index.ty == Treturn || mtype.index.ty == Tmixin)
{
Expression e;
Type t;
Dsymbol s;
mtype.index.resolve(loc, sc, &e, &t, &s);
//https://issues.dlang.org/show_bug.cgi?id=15478
if (s)
{
if (FuncDeclaration fd = s.toAlias().isFuncDeclaration())
e = new CallExp(loc, fd, null);
}
if (e)
{
// It was an expression -
// Rewrite as a static array
auto tsa = new TypeSArray(mtype.next, e);
return tsa.typeSemantic(loc, sc);
}
else if (t)
mtype.index = t.typeSemantic(loc, sc);
else
{
.error(loc, "index is not a type or an expression");
return error();
}
}
else
mtype.index = mtype.index.typeSemantic(loc, sc);
mtype.index = mtype.index.merge2();
if (mtype.index.nextOf() && !mtype.index.nextOf().isImmutable())
{
mtype.index = mtype.index.constOf().mutableOf();
version (none)
{
printf("index is %p %s\n", mtype.index, mtype.index.toChars());
mtype.index.check();
printf("index.mod = x%x\n", mtype.index.mod);
printf("index.ito = x%x\n", mtype.index.ito);
if (mtype.index.ito)
{
printf("index.ito.mod = x%x\n", mtype.index.ito.mod);
printf("index.ito.ito = x%x\n", mtype.index.ito.ito);
}
}
}
switch (mtype.index.toBasetype().ty)
{
case Tfunction:
case Tvoid:
case Tnone:
case Ttuple:
.error(loc, "cannot have associative array key of `%s`", mtype.index.toBasetype().toChars());
goto case Terror;
case Terror:
return error();
default:
break;
}
Type tbase = mtype.index.baseElemOf();
while (tbase.ty == Tarray)
tbase = tbase.nextOf().baseElemOf();
if (auto ts = tbase.isTypeStruct())
{
/* AA's need typeid(index).equals() and getHash(). Issue error if not correctly set up.
*/
StructDeclaration sd = ts.sym;
if (sd.semanticRun < PASS.semanticdone)
sd.dsymbolSemantic(null);
// duplicate a part of StructDeclaration::semanticTypeInfoMembers
//printf("AA = %s, key: xeq = %p, xerreq = %p xhash = %p\n", toChars(), sd.xeq, sd.xerreq, sd.xhash);
if (sd.xeq && sd.xeq._scope && sd.xeq.semanticRun < PASS.semantic3done)
{
uint errors = global.startGagging();
sd.xeq.semantic3(sd.xeq._scope);
if (global.endGagging(errors))
sd.xeq = sd.xerreq;
}
//printf("AA = %s, key: xeq = %p, xhash = %p\n", toChars(), sd.xeq, sd.xhash);
const(char)* s = (mtype.index.toBasetype().ty != Tstruct) ? "bottom of " : "";
if (!sd.xeq)
{
// If sd.xhash != NULL:
// sd or its fields have user-defined toHash.
// AA assumes that its result is consistent with bitwise equality.
// else:
// bitwise equality & hashing
}
else if (sd.xeq == sd.xerreq)
{
if (search_function(sd, Id.eq))
{
.error(loc, "%sAA key type `%s` does not have `bool opEquals(ref const %s) const`", s, sd.toChars(), sd.toChars());
}
else
{
.error(loc, "%sAA key type `%s` does not support const equality", s, sd.toChars());
}
return error();
}