/
traits.d
1941 lines (1742 loc) · 57.1 KB
/
traits.d
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/**
* Handle introspection functionality of the `__traits()` construct.
*
* Specification: $(LINK2 https://dlang.org/spec/traits.html, Traits)
*
* 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/traits.d, _traits.d)
* Documentation: https://dlang.org/phobos/dmd_traits.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/traits.d
*/
module dmd.traits;
import core.stdc.stdio;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astcodegen;
import dmd.attrib;
import dmd.canthrow;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dimport;
import dmd.dmodule;
import dmd.dscope;
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.mtype;
import dmd.nogc;
import dmd.parse;
import dmd.root.array;
import dmd.root.speller;
import dmd.root.stringtable;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
import dmd.root.rootobject;
import dmd.root.outbuffer;
import dmd.root.string;
enum LOGSEMANTIC = false;
/************************ TraitsExp ************************************/
/**************************************
* Convert `Expression` or `Type` to corresponding `Dsymbol`, additionally
* stripping off expression contexts.
*
* Some symbol related `__traits` ignore arguments expression contexts.
* For example:
* ----
* struct S { void f() {} }
* S s;
* pragma(msg, __traits(isNested, s.f));
* // s.f is `DotVarExp`, but `__traits(isNested)`` needs a `FuncDeclaration`.
* ----
*
* This is used for that common `__traits` behavior.
*
* Input:
* oarg object to get the symbol for
* Returns:
* Dsymbol the corresponding symbol for oarg
*/
private Dsymbol getDsymbolWithoutExpCtx(RootObject oarg)
{
if (auto e = isExpression(oarg))
{
if (e.op == TOK.dotVariable)
return (cast(DotVarExp)e).var;
if (e.op == TOK.dotTemplateDeclaration)
return (cast(DotTemplateExp)e).td;
}
return getDsymbol(oarg);
}
private const StringTable!bool traitsStringTable;
shared static this()
{
static immutable string[] names =
[
"isAbstractClass",
"isArithmetic",
"isAssociativeArray",
"isDisabled",
"isDeprecated",
"isFuture",
"isFinalClass",
"isPOD",
"isNested",
"isFloating",
"isIntegral",
"isScalar",
"isStaticArray",
"isUnsigned",
"isVirtualFunction",
"isVirtualMethod",
"isAbstractFunction",
"isFinalFunction",
"isOverrideFunction",
"isStaticFunction",
"isModule",
"isPackage",
"isRef",
"isOut",
"isLazy",
"isReturnOnStack",
"hasMember",
"identifier",
"getProtection",
"parent",
"getLinkage",
"getMember",
"getOverloads",
"getVirtualFunctions",
"getVirtualMethods",
"classInstanceSize",
"allMembers",
"derivedMembers",
"isSame",
"compiles",
"parameters",
"getAliasThis",
"getAttributes",
"getFunctionAttributes",
"getFunctionVariadicStyle",
"getParameterStorageClasses",
"getUnitTests",
"getVirtualIndex",
"getPointerBitmap",
"isZeroInit",
"getTargetInfo",
"getLocation",
"hasPostblit",
"hasCopyConstructor",
];
StringTable!(bool)* stringTable = cast(StringTable!(bool)*) &traitsStringTable;
stringTable._init(names.length);
foreach (s; names)
{
auto sv = stringTable.insert(s, true);
assert(sv);
}
}
/**
* get an array of size_t values that indicate possible pointer words in memory
* if interpreted as the type given as argument
* Returns: the size of the type in bytes, d_uns64.max on error
*/
d_uns64 getTypePointerBitmap(Loc loc, Type t, Array!(d_uns64)* data)
{
d_uns64 sz;
if (t.ty == Tclass && !(cast(TypeClass)t).sym.isInterfaceDeclaration())
sz = (cast(TypeClass)t).sym.AggregateDeclaration.size(loc);
else
sz = t.size(loc);
if (sz == SIZE_INVALID)
return d_uns64.max;
const sz_size_t = Type.tsize_t.size(loc);
if (sz > sz.max - sz_size_t)
{
error(loc, "size overflow for type `%s`", t.toChars());
return d_uns64.max;
}
d_uns64 bitsPerWord = sz_size_t * 8;
d_uns64 cntptr = (sz + sz_size_t - 1) / sz_size_t;
d_uns64 cntdata = (cntptr + bitsPerWord - 1) / bitsPerWord;
data.setDim(cast(size_t)cntdata);
data.zero();
extern (C++) final class PointerBitmapVisitor : Visitor
{
alias visit = Visitor.visit;
public:
extern (D) this(Array!(d_uns64)* _data, d_uns64 _sz_size_t)
{
this.data = _data;
this.sz_size_t = _sz_size_t;
}
void setpointer(d_uns64 off)
{
d_uns64 ptroff = off / sz_size_t;
(*data)[cast(size_t)(ptroff / (8 * sz_size_t))] |= 1L << (ptroff % (8 * sz_size_t));
}
override void visit(Type t)
{
Type tb = t.toBasetype();
if (tb != t)
tb.accept(this);
}
override void visit(TypeError t)
{
visit(cast(Type)t);
}
override void visit(TypeNext t)
{
assert(0);
}
override void visit(TypeBasic t)
{
if (t.ty == Tvoid)
setpointer(offset);
}
override void visit(TypeVector t)
{
}
override void visit(TypeArray t)
{
assert(0);
}
override void visit(TypeSArray t)
{
d_uns64 arrayoff = offset;
d_uns64 nextsize = t.next.size();
if (nextsize == SIZE_INVALID)
error = true;
d_uns64 dim = t.dim.toInteger();
for (d_uns64 i = 0; i < dim; i++)
{
offset = arrayoff + i * nextsize;
t.next.accept(this);
}
offset = arrayoff;
}
override void visit(TypeDArray t)
{
setpointer(offset + sz_size_t);
}
// dynamic array is {length,ptr}
override void visit(TypeAArray t)
{
setpointer(offset);
}
override void visit(TypePointer t)
{
if (t.nextOf().ty != Tfunction) // don't mark function pointers
setpointer(offset);
}
override void visit(TypeReference t)
{
setpointer(offset);
}
override void visit(TypeClass t)
{
setpointer(offset);
}
override void visit(TypeFunction t)
{
}
override void visit(TypeDelegate t)
{
setpointer(offset);
}
// delegate is {context, function}
override void visit(TypeQualified t)
{
assert(0);
}
// assume resolved
override void visit(TypeIdentifier t)
{
assert(0);
}
override void visit(TypeInstance t)
{
assert(0);
}
override void visit(TypeTypeof t)
{
assert(0);
}
override void visit(TypeReturn t)
{
assert(0);
}
override void visit(TypeEnum t)
{
visit(cast(Type)t);
}
override void visit(TypeTuple t)
{
visit(cast(Type)t);
}
override void visit(TypeSlice t)
{
assert(0);
}
override void visit(TypeNull t)
{
// always a null pointer
}
override void visit(TypeStruct t)
{
d_uns64 structoff = offset;
foreach (v; t.sym.fields)
{
offset = structoff + v.offset;
if (v.type.ty == Tclass)
setpointer(offset);
else
v.type.accept(this);
}
offset = structoff;
}
// a "toplevel" class is treated as an instance, while TypeClass fields are treated as references
void visitClass(TypeClass t)
{
d_uns64 classoff = offset;
// skip vtable-ptr and monitor
if (t.sym.baseClass)
visitClass(cast(TypeClass)t.sym.baseClass.type);
foreach (v; t.sym.fields)
{
offset = classoff + v.offset;
v.type.accept(this);
}
offset = classoff;
}
Array!(d_uns64)* data;
d_uns64 offset;
d_uns64 sz_size_t;
bool error;
}
scope PointerBitmapVisitor pbv = new PointerBitmapVisitor(data, sz_size_t);
if (t.ty == Tclass)
pbv.visitClass(cast(TypeClass)t);
else
t.accept(pbv);
return pbv.error ? d_uns64.max : sz;
}
/**
* get an array of size_t values that indicate possible pointer words in memory
* if interpreted as the type given as argument
* the first array element is the size of the type for independent interpretation
* of the array
* following elements bits represent one word (4/8 bytes depending on the target
* architecture). If set the corresponding memory might contain a pointer/reference.
*
* Returns: [T.sizeof, pointerbit0-31/63, pointerbit32/64-63/128, ...]
*/
private Expression pointerBitmap(TraitsExp e)
{
if (!e.args || e.args.dim != 1)
{
error(e.loc, "a single type expected for trait pointerBitmap");
return new ErrorExp();
}
Type t = getType((*e.args)[0]);
if (!t)
{
error(e.loc, "`%s` is not a type", (*e.args)[0].toChars());
return new ErrorExp();
}
Array!(d_uns64) data;
d_uns64 sz = getTypePointerBitmap(e.loc, t, &data);
if (sz == d_uns64.max)
return new ErrorExp();
auto exps = new Expressions(data.dim + 1);
(*exps)[0] = new IntegerExp(e.loc, sz, Type.tsize_t);
foreach (size_t i; 1 .. exps.dim)
(*exps)[i] = new IntegerExp(e.loc, data[cast(size_t) (i - 1)], Type.tsize_t);
auto ale = new ArrayLiteralExp(e.loc, Type.tsize_t.sarrayOf(data.dim + 1), exps);
return ale;
}
Expression semanticTraits(TraitsExp e, Scope* sc)
{
static if (LOGSEMANTIC)
{
printf("TraitsExp::semantic() %s\n", e.toChars());
}
if (e.ident != Id.compiles &&
e.ident != Id.isSame &&
e.ident != Id.identifier &&
e.ident != Id.getProtection &&
e.ident != Id.getAttributes)
{
// Pretend we're in a deprecated scope so that deprecation messages
// aren't triggered when checking if a symbol is deprecated
const save = sc.stc;
if (e.ident == Id.isDeprecated)
sc.stc |= STC.deprecated_;
if (!TemplateInstance.semanticTiargs(e.loc, sc, e.args, 1))
{
sc.stc = save;
return new ErrorExp();
}
sc.stc = save;
}
size_t dim = e.args ? e.args.dim : 0;
Expression dimError(int expected)
{
e.error("expected %d arguments for `%s` but had %d", expected, e.ident.toChars(), cast(int)dim);
return new ErrorExp();
}
static IntegerExp True()
{
return IntegerExp.createBool(true);
}
static IntegerExp False()
{
return IntegerExp.createBool(false);
}
/********
* Gets the function type from a given AST node
* if the node is a function of some sort.
* Params:
* o = an AST node to check for a `TypeFunction`
* fdp = if `o` is a FuncDeclaration then fdp is set to that, otherwise `null`
* Returns:
* a type node if `o` is a declaration of
* a delegate, function, function-pointer or a variable of the former.
* Otherwise, `null`.
*/
static TypeFunction toTypeFunction(RootObject o, out FuncDeclaration fdp)
{
Type t;
if (auto s = getDsymbolWithoutExpCtx(o))
{
if (auto fd = s.isFuncDeclaration())
{
t = fd.type;
fdp = fd;
}
else if (auto vd = s.isVarDeclaration())
t = vd.type;
else
t = isType(o);
}
else
t = isType(o);
if (t)
{
if (t.ty == Tfunction)
return cast(TypeFunction)t;
else if (t.ty == Tdelegate)
return cast(TypeFunction)t.nextOf();
else if (t.ty == Tpointer && t.nextOf().ty == Tfunction)
return cast(TypeFunction)t.nextOf();
}
return null;
}
IntegerExp isX(T)(bool delegate(T) fp)
{
if (!dim)
return False();
foreach (o; *e.args)
{
static if (is(T == Type))
auto y = getType(o);
static if (is(T : Dsymbol))
{
auto s = getDsymbolWithoutExpCtx(o);
if (!s)
return False();
}
static if (is(T == Dsymbol))
alias y = s;
static if (is(T == Declaration))
auto y = s.isDeclaration();
static if (is(T == FuncDeclaration))
auto y = s.isFuncDeclaration();
static if (is(T == EnumMember))
auto y = s.isEnumMember();
if (!y || !fp(y))
return False();
}
return True();
}
alias isTypeX = isX!Type;
alias isDsymX = isX!Dsymbol;
alias isDeclX = isX!Declaration;
alias isFuncX = isX!FuncDeclaration;
alias isEnumMemX = isX!EnumMember;
Expression isPkgX(bool function(Package) fp)
{
return isDsymX((Dsymbol sym) {
Package p = resolveIsPackage(sym);
return (p !is null) && fp(p);
});
}
if (e.ident == Id.isArithmetic)
{
return isTypeX(t => t.isintegral() || t.isfloating());
}
if (e.ident == Id.isFloating)
{
return isTypeX(t => t.isfloating());
}
if (e.ident == Id.isIntegral)
{
return isTypeX(t => t.isintegral());
}
if (e.ident == Id.isScalar)
{
return isTypeX(t => t.isscalar());
}
if (e.ident == Id.isUnsigned)
{
return isTypeX(t => t.isunsigned());
}
if (e.ident == Id.isAssociativeArray)
{
return isTypeX(t => t.toBasetype().ty == Taarray);
}
if (e.ident == Id.isDeprecated)
{
if (global.params.vcomplex)
{
if (isTypeX(t => t.iscomplex() || t.isimaginary()).isBool(true))
return True();
}
return isDsymX(t => t.isDeprecated());
}
if (e.ident == Id.isFuture)
{
return isDeclX(t => t.isFuture());
}
if (e.ident == Id.isStaticArray)
{
return isTypeX(t => t.toBasetype().ty == Tsarray);
}
if (e.ident == Id.isAbstractClass)
{
return isTypeX(t => t.toBasetype().ty == Tclass &&
(cast(TypeClass)t.toBasetype()).sym.isAbstract());
}
if (e.ident == Id.isFinalClass)
{
return isTypeX(t => t.toBasetype().ty == Tclass &&
((cast(TypeClass)t.toBasetype()).sym.storage_class & STC.final_) != 0);
}
if (e.ident == Id.isTemplate)
{
if (dim != 1)
return dimError(1);
return isDsymX((s)
{
if (!s.toAlias().isOverloadable())
return false;
return overloadApply(s,
sm => sm.isTemplateDeclaration() !is null) != 0;
});
}
if (e.ident == Id.isPOD)
{
if (dim != 1)
return dimError(1);
auto o = (*e.args)[0];
auto t = isType(o);
if (!t)
{
e.error("type expected as second argument of __traits `%s` instead of `%s`",
e.ident.toChars(), o.toChars());
return new ErrorExp();
}
Type tb = t.baseElemOf();
if (auto sd = tb.ty == Tstruct ? (cast(TypeStruct)tb).sym : null)
{
return sd.isPOD() ? True() : False();
}
return True();
}
if (e.ident == Id.hasCopyConstructor || e.ident == Id.hasPostblit)
{
if (dim != 1)
return dimError(1);
auto o = (*e.args)[0];
auto t = isType(o);
if (!t)
{
e.error("type expected as second argument of __traits `%s` instead of `%s`",
e.ident.toChars(), o.toChars());
return new ErrorExp();
}
Type tb = t.baseElemOf();
if (auto sd = tb.ty == Tstruct ? (cast(TypeStruct)tb).sym : null)
{
return (e.ident == Id.hasPostblit) ? (sd.postblit ? True() : False())
: (sd.hasCopyCtor ? True() : False());
}
return False();
}
if (e.ident == Id.isNested)
{
if (dim != 1)
return dimError(1);
auto o = (*e.args)[0];
auto s = getDsymbolWithoutExpCtx(o);
if (!s)
{
}
else if (auto ad = s.isAggregateDeclaration())
{
return ad.isNested() ? True() : False();
}
else if (auto fd = s.isFuncDeclaration())
{
return fd.isNested() ? True() : False();
}
e.error("aggregate or function expected instead of `%s`", o.toChars());
return new ErrorExp();
}
if (e.ident == Id.isDisabled)
{
if (dim != 1)
return dimError(1);
return isDeclX(f => f.isDisabled());
}
if (e.ident == Id.isAbstractFunction)
{
if (dim != 1)
return dimError(1);
return isFuncX(f => f.isAbstract());
}
if (e.ident == Id.isVirtualFunction)
{
if (dim != 1)
return dimError(1);
return isFuncX(f => f.isVirtual());
}
if (e.ident == Id.isVirtualMethod)
{
if (dim != 1)
return dimError(1);
return isFuncX(f => f.isVirtualMethod());
}
if (e.ident == Id.isFinalFunction)
{
if (dim != 1)
return dimError(1);
return isFuncX(f => f.isFinalFunc());
}
if (e.ident == Id.isOverrideFunction)
{
if (dim != 1)
return dimError(1);
return isFuncX(f => f.isOverride());
}
if (e.ident == Id.isStaticFunction)
{
if (dim != 1)
return dimError(1);
return isFuncX(f => !f.needThis() && !f.isNested());
}
if (e.ident == Id.isModule)
{
if (dim != 1)
return dimError(1);
return isPkgX(p => p.isModule() || p.isPackageMod());
}
if (e.ident == Id.isPackage)
{
if (dim != 1)
return dimError(1);
return isPkgX(p => p.isModule() is null);
}
if (e.ident == Id.isRef)
{
if (dim != 1)
return dimError(1);
return isDeclX(d => d.isRef());
}
if (e.ident == Id.isOut)
{
if (dim != 1)
return dimError(1);
return isDeclX(d => d.isOut());
}
if (e.ident == Id.isLazy)
{
if (dim != 1)
return dimError(1);
return isDeclX(d => (d.storage_class & STC.lazy_) != 0);
}
if (e.ident == Id.identifier)
{
// Get identifier for symbol as a string literal
/* Specify 0 for bit 0 of the flags argument to semanticTiargs() so that
* a symbol should not be folded to a constant.
* Bit 1 means don't convert Parameter to Type if Parameter has an identifier
*/
if (!TemplateInstance.semanticTiargs(e.loc, sc, e.args, 2))
return new ErrorExp();
if (dim != 1)
return dimError(1);
auto o = (*e.args)[0];
Identifier id;
if (auto po = isParameter(o))
{
if (!po.ident)
{
e.error("argument `%s` has no identifier", po.type.toChars());
return new ErrorExp();
}
id = po.ident;
}
else
{
Dsymbol s = getDsymbolWithoutExpCtx(o);
if (!s || !s.ident)
{
e.error("argument `%s` has no identifier", o.toChars());
return new ErrorExp();
}
id = s.ident;
}
auto se = new StringExp(e.loc, id.toString());
return se.expressionSemantic(sc);
}
if (e.ident == Id.getProtection)
{
if (dim != 1)
return dimError(1);
Scope* sc2 = sc.push();
sc2.flags = sc.flags | SCOPE.noaccesscheck | SCOPE.ignoresymbolvisibility;
bool ok = TemplateInstance.semanticTiargs(e.loc, sc2, e.args, 1);
sc2.pop();
if (!ok)
return new ErrorExp();
auto o = (*e.args)[0];
auto s = getDsymbolWithoutExpCtx(o);
if (!s)
{
if (!isError(o))
e.error("argument `%s` has no protection", o.toChars());
return new ErrorExp();
}
if (s.semanticRun == PASS.init)
s.dsymbolSemantic(null);
auto protName = protectionToString(s.prot().kind); // TODO: How about package(names)
assert(protName);
auto se = new StringExp(e.loc, protName);
return se.expressionSemantic(sc);
}
if (e.ident == Id.parent)
{
if (dim != 1)
return dimError(1);
auto o = (*e.args)[0];
auto s = getDsymbolWithoutExpCtx(o);
if (s)
{
// https://issues.dlang.org/show_bug.cgi?id=12496
// Consider:
// class T1
// {
// class C(uint value) { }
// }
// __traits(parent, T1.C!2)
if (auto ad = s.isAggregateDeclaration()) // `s` is `C`
{
if (ad.isNested()) // `C` is nested
{
if (auto p = s.toParent()) // `C`'s parent is `C!2`, believe it or not
{
if (p.isTemplateInstance()) // `C!2` is a template instance
{
s = p; // `C!2`'s parent is `T1`
auto td = (cast(TemplateInstance)p).tempdecl;
if (td)
s = td; // get the declaration context just in case there's two contexts
}
}
}
}
if (auto fd = s.isFuncDeclaration()) // https://issues.dlang.org/show_bug.cgi?id=8943
s = fd.toAliasFunc();
if (!s.isImport()) // https://issues.dlang.org/show_bug.cgi?id=8922
s = s.toParent();
}
if (!s || s.isImport())
{
e.error("argument `%s` has no parent", o.toChars());
return new ErrorExp();
}
if (auto f = s.isFuncDeclaration())
{
if (auto td = getFuncTemplateDecl(f))
{
if (td.overroot) // if not start of overloaded list of TemplateDeclaration's
td = td.overroot; // then get the start
Expression ex = new TemplateExp(e.loc, td, f);
ex = ex.expressionSemantic(sc);
return ex;
}
if (auto fld = f.isFuncLiteralDeclaration())
{
// Directly translate to VarExp instead of FuncExp
Expression ex = new VarExp(e.loc, fld, true);
return ex.expressionSemantic(sc);
}
}
return symbolToExp(s, e.loc, sc, false);
}
if (e.ident == Id.hasMember ||
e.ident == Id.getMember ||
e.ident == Id.getOverloads ||
e.ident == Id.getVirtualMethods ||
e.ident == Id.getVirtualFunctions)
{
if (dim != 2 && !(dim == 3 && e.ident == Id.getOverloads))
return dimError(2);
auto o = (*e.args)[0];
auto ex = isExpression((*e.args)[1]);
if (!ex)
{
e.error("expression expected as second argument of __traits `%s`", e.ident.toChars());
return new ErrorExp();
}
ex = ex.ctfeInterpret();
bool includeTemplates = false;
if (dim == 3 && e.ident == Id.getOverloads)
{
auto b = isExpression((*e.args)[2]);
b = b.ctfeInterpret();
if (!b.type.equals(Type.tbool))
{
e.error("`bool` expected as third argument of `__traits(getOverloads)`, not `%s` of type `%s`", b.toChars(), b.type.toChars());
return new ErrorExp();
}
includeTemplates = b.isBool(true);
}
StringExp se = ex.toStringExp();
if (!se || se.len == 0)
{
e.error("string expected as second argument of __traits `%s` instead of `%s`", e.ident.toChars(), ex.toChars());
return new ErrorExp();
}
se = se.toUTF8(sc);
if (se.sz != 1)
{
e.error("string must be chars");
return new ErrorExp();
}
auto id = Identifier.idPool(se.peekString());
/* Prefer dsymbol, because it might need some runtime contexts.
*/
Dsymbol sym = getDsymbol(o);
if (sym)
{
if (e.ident == Id.hasMember)
{
if (auto sm = sym.search(e.loc, id))
return True();
}
ex = new DsymbolExp(e.loc, sym);
ex = new DotIdExp(e.loc, ex, id);
}
else if (auto t = isType(o))
ex = typeDotIdExp(e.loc, t, id);
else if (auto ex2 = isExpression(o))
ex = new DotIdExp(e.loc, ex2, id);
else
{
e.error("invalid first argument");
return new ErrorExp();
}
// ignore symbol visibility and disable access checks for these traits
Scope* scx = sc.push();
scx.flags |= SCOPE.ignoresymbolvisibility | SCOPE.noaccesscheck;
scope (exit) scx.pop();
if (e.ident == Id.hasMember)
{
/* Take any errors as meaning it wasn't found
*/
ex = ex.trySemantic(scx);
return ex ? True() : False();
}
else if (e.ident == Id.getMember)
{
if (ex.op == TOK.dotIdentifier)
// Prevent semantic() from replacing Symbol with its initializer
(cast(DotIdExp)ex).wantsym = true;
ex = ex.expressionSemantic(scx);
return ex;
}
else if (e.ident == Id.getVirtualFunctions ||
e.ident == Id.getVirtualMethods ||
e.ident == Id.getOverloads)
{
uint errors = global.errors;
Expression eorig = ex;
ex = ex.expressionSemantic(scx);
if (errors < global.errors)
e.error("`%s` cannot be resolved", eorig.toChars());
/* Create tuple of functions of ex
*/
auto exps = new Expressions();
Dsymbol f;
if (ex.op == TOK.variable)
{
VarExp ve = cast(VarExp)ex;
f = ve.var.isFuncDeclaration();
ex = null;
}
else if (ex.op == TOK.dotVariable)
{