forked from dlang/dmd
/
expressionsem.d
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/
expressionsem.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/expressionsem.d, _expressionsem.d)
* Documentation: https://dlang.org/phobos/dmd_expressionsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/expressionsem.d
*/
module dmd.expressionsem;
import core.stdc.stdio;
import dmd.access;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.attrib;
import dmd.astcodegen;
import dmd.canthrow;
import dmd.ctorflow;
import dmd.dscope;
import dmd.dsymbol;
import dmd.declaration;
import dmd.dclass;
import dmd.dcast;
import dmd.delegatize;
import dmd.denum;
import dmd.dimport;
import dmd.dinterpret;
import dmd.dmangle;
import dmd.dmodule;
import dmd.dstruct;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.escape;
import dmd.expression;
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.inline;
import dmd.intrange;
import dmd.mtype;
import dmd.nspace;
import dmd.opover;
import dmd.optimize;
import dmd.parse;
import dmd.root.ctfloat;
import dmd.root.file;
import dmd.root.filename;
import dmd.root.outbuffer;
import dmd.root.rootobject;
import dmd.root.string;
import dmd.semantic2;
import dmd.semantic3;
import dmd.sideeffect;
import dmd.safe;
import dmd.target;
import dmd.tokens;
import dmd.traits;
import dmd.typesem;
import dmd.typinf;
import dmd.utf;
import dmd.utils;
import dmd.visitor;
enum LOGSEMANTIC = false;
/********************************************************
* Perform semantic analysis and CTFE on expressions to produce
* a string.
* Params:
* buf = append generated string to buffer
* sc = context
* exps = array of Expressions
* Returns:
* true on error
*/
bool expressionsToString(ref OutBuffer buf, Scope* sc, Expressions* exps)
{
if (!exps)
return false;
foreach (ex; *exps)
{
if (!ex)
continue;
auto sc2 = sc.startCTFE();
auto e2 = ex.expressionSemantic(sc2);
auto e3 = resolveProperties(sc2, e2);
sc2.endCTFE();
// allowed to contain types as well as expressions
auto e4 = ctfeInterpretForPragmaMsg(e3);
if (!e4 || e4.op == TOK.error)
return true;
// expand tuple
if (auto te = e4.isTupleExp())
{
if (expressionsToString(buf, sc, te.exps))
return true;
continue;
}
// char literals exp `.toStringExp` return `null` but we cant override it
// because in most contexts we don't want the conversion to succeed.
IntegerExp ie = e4.isIntegerExp();
const ty = (ie && ie.type) ? ie.type.ty : Terror;
if (ty == Tchar || ty == Twchar || ty == Tdchar)
{
auto tsa = new TypeSArray(ie.type, new IntegerExp(1));
e4 = new ArrayLiteralExp(ex.loc, tsa, ie);
}
if (StringExp se = e4.toStringExp())
buf.writestring(se.toUTF8(sc).peekString());
else
buf.writestring(e4.toString());
}
return false;
}
/***********************************************************
* Resolve `exp` as a compile-time known string.
* Params:
* sc = scope
* exp = Expression which expected as a string
* s = What the string is expected for, will be used in error diagnostic.
* Returns:
* String literal, or `null` if error happens.
*/
StringExp semanticString(Scope *sc, Expression exp, const char* s)
{
sc = sc.startCTFE();
exp = exp.expressionSemantic(sc);
exp = resolveProperties(sc, exp);
sc = sc.endCTFE();
if (exp.op == TOK.error)
return null;
auto e = exp;
if (exp.type.isString())
{
e = e.ctfeInterpret();
if (e.op == TOK.error)
return null;
}
auto se = e.toStringExp();
if (!se)
{
exp.error("`string` expected for %s, not `(%s)` of type `%s`",
s, exp.toChars(), exp.type.toChars());
return null;
}
return se;
}
private Expression extractOpDollarSideEffect(Scope* sc, UnaExp ue)
{
Expression e0;
Expression e1 = Expression.extractLast(ue.e1, e0);
// https://issues.dlang.org/show_bug.cgi?id=12585
// Extract the side effect part if ue.e1 is comma.
if ((sc.flags & SCOPE.ctfe) ? hasSideEffect(e1) : !isTrivialExp(e1)) // match logic in extractSideEffect()
{
/* Even if opDollar is needed, 'e1' should be evaluate only once. So
* Rewrite:
* e1.opIndex( ... use of $ ... )
* e1.opSlice( ... use of $ ... )
* as:
* (ref __dop = e1, __dop).opIndex( ... __dop.opDollar ...)
* (ref __dop = e1, __dop).opSlice( ... __dop.opDollar ...)
*/
e1 = extractSideEffect(sc, "__dop", e0, e1, false);
assert(e1.op == TOK.variable);
VarExp ve = cast(VarExp)e1;
ve.var.storage_class |= STC.exptemp; // lifetime limited to expression
}
ue.e1 = e1;
return e0;
}
/**************************************
* Runs semantic on ae.arguments. Declares temporary variables
* if '$' was used.
*/
Expression resolveOpDollar(Scope* sc, ArrayExp ae, Expression* pe0)
{
assert(!ae.lengthVar);
*pe0 = null;
AggregateDeclaration ad = isAggregate(ae.e1.type);
Dsymbol slice = search_function(ad, Id.slice);
//printf("slice = %s %s\n", slice.kind(), slice.toChars());
foreach (i, e; *ae.arguments)
{
if (i == 0)
*pe0 = extractOpDollarSideEffect(sc, ae);
if (e.op == TOK.interval && !(slice && slice.isTemplateDeclaration()))
{
Lfallback:
if (ae.arguments.dim == 1)
return null;
ae.error("multi-dimensional slicing requires template `opSlice`");
return new ErrorExp();
}
//printf("[%d] e = %s\n", i, e.toChars());
// Create scope for '$' variable for this dimension
auto sym = new ArrayScopeSymbol(sc, ae);
sym.parent = sc.scopesym;
sc = sc.push(sym);
ae.lengthVar = null; // Create it only if required
ae.currentDimension = i; // Dimension for $, if required
e = e.expressionSemantic(sc);
e = resolveProperties(sc, e);
if (ae.lengthVar && sc.func)
{
// If $ was used, declare it now
Expression de = new DeclarationExp(ae.loc, ae.lengthVar);
de = de.expressionSemantic(sc);
*pe0 = Expression.combine(*pe0, de);
}
sc = sc.pop();
if (e.op == TOK.interval)
{
IntervalExp ie = cast(IntervalExp)e;
auto tiargs = new Objects();
Expression edim = new IntegerExp(ae.loc, i, Type.tsize_t);
edim = edim.expressionSemantic(sc);
tiargs.push(edim);
auto fargs = new Expressions(2);
(*fargs)[0] = ie.lwr;
(*fargs)[1] = ie.upr;
uint xerrors = global.startGagging();
sc = sc.push();
FuncDeclaration fslice = resolveFuncCall(ae.loc, sc, slice, tiargs, ae.e1.type, fargs, FuncResolveFlag.quiet);
sc = sc.pop();
global.endGagging(xerrors);
if (!fslice)
goto Lfallback;
e = new DotTemplateInstanceExp(ae.loc, ae.e1, slice.ident, tiargs);
e = new CallExp(ae.loc, e, fargs);
e = e.expressionSemantic(sc);
}
if (!e.type)
{
ae.error("`%s` has no value", e.toChars());
e = new ErrorExp();
}
if (e.op == TOK.error)
return e;
(*ae.arguments)[i] = e;
}
return ae;
}
/**************************************
* Runs semantic on se.lwr and se.upr. Declares a temporary variable
* if '$' was used.
* Returns:
* ae, or ErrorExp if errors occurred
*/
Expression resolveOpDollar(Scope* sc, ArrayExp ae, IntervalExp ie, Expression* pe0)
{
//assert(!ae.lengthVar);
if (!ie)
return ae;
VarDeclaration lengthVar = ae.lengthVar;
bool errors = false;
// create scope for '$'
auto sym = new ArrayScopeSymbol(sc, ae);
sym.parent = sc.scopesym;
sc = sc.push(sym);
Expression sem(Expression e)
{
e = e.expressionSemantic(sc);
e = resolveProperties(sc, e);
if (!e.type)
{
ae.error("`%s` has no value", e.toChars());
errors = true;
}
return e;
}
ie.lwr = sem(ie.lwr);
ie.upr = sem(ie.upr);
if (lengthVar != ae.lengthVar && sc.func)
{
// If $ was used, declare it now
Expression de = new DeclarationExp(ae.loc, ae.lengthVar);
de = de.expressionSemantic(sc);
*pe0 = Expression.combine(*pe0, de);
}
sc = sc.pop();
return errors ? new ErrorExp() : ae;
}
/******************************
* Perform semantic() on an array of Expressions.
*/
bool arrayExpressionSemantic(Expressions* exps, Scope* sc, bool preserveErrors = false)
{
bool err = false;
if (exps)
{
foreach (ref e; *exps)
{
if (e)
{
auto e2 = e.expressionSemantic(sc);
if (e2.op == TOK.error)
err = true;
if (preserveErrors || e2.op != TOK.error)
e = e2;
}
}
}
return err;
}
/******************************
* Check the tail CallExp is really property function call.
* Bugs:
* This doesn't appear to do anything.
*/
private bool checkPropertyCall(Expression e)
{
e = lastComma(e);
if (e.op == TOK.call)
{
CallExp ce = cast(CallExp)e;
TypeFunction tf;
if (ce.f)
{
tf = cast(TypeFunction)ce.f.type;
/* If a forward reference to ce.f, try to resolve it
*/
if (!tf.deco && ce.f.semanticRun < PASS.semanticdone)
{
ce.f.dsymbolSemantic(null);
tf = cast(TypeFunction)ce.f.type;
}
}
else if (ce.e1.type.ty == Tfunction)
tf = cast(TypeFunction)ce.e1.type;
else if (ce.e1.type.ty == Tdelegate)
tf = cast(TypeFunction)ce.e1.type.nextOf();
else if (ce.e1.type.ty == Tpointer && ce.e1.type.nextOf().ty == Tfunction)
tf = cast(TypeFunction)ce.e1.type.nextOf();
else
assert(0);
}
return false;
}
/******************************
* Find symbol in accordance with the UFCS name look up rule
*/
private Expression searchUFCS(Scope* sc, UnaExp ue, Identifier ident)
{
//printf("searchUFCS(ident = %s)\n", ident.toChars());
Loc loc = ue.loc;
// TODO: merge with Scope.search.searchScopes()
Dsymbol searchScopes(int flags)
{
Dsymbol s = null;
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (!scx.scopesym)
continue;
if (scx.scopesym.isModule())
flags |= SearchUnqualifiedModule; // tell Module.search() that SearchLocalsOnly is to be obeyed
s = scx.scopesym.search(loc, ident, flags);
if (s)
{
// overload set contains only module scope symbols.
if (s.isOverloadSet())
break;
// selective/renamed imports also be picked up
if (AliasDeclaration ad = s.isAliasDeclaration())
{
if (ad._import)
break;
}
// See only module scope symbols for UFCS target.
Dsymbol p = s.toParent2();
if (p && p.isModule())
break;
}
s = null;
// Stop when we hit a module, but keep going if that is not just under the global scope
if (scx.scopesym.isModule() && !(scx.enclosing && !scx.enclosing.enclosing))
break;
}
return s;
}
int flags = 0;
Dsymbol s;
if (sc.flags & SCOPE.ignoresymbolvisibility)
flags |= IgnoreSymbolVisibility;
// First look in local scopes
s = searchScopes(flags | SearchLocalsOnly);
if (!s)
{
// Second look in imported modules
s = searchScopes(flags | SearchImportsOnly);
}
if (!s)
return ue.e1.type.Type.getProperty(loc, ident, 0);
FuncDeclaration f = s.isFuncDeclaration();
if (f)
{
TemplateDeclaration td = getFuncTemplateDecl(f);
if (td)
{
if (td.overroot)
td = td.overroot;
s = td;
}
}
if (ue.op == TOK.dotTemplateInstance)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)ue;
auto ti = new TemplateInstance(loc, s.ident, dti.ti.tiargs);
if (!ti.updateTempDecl(sc, s))
return new ErrorExp();
return new ScopeExp(loc, ti);
}
else
{
//printf("-searchUFCS() %s\n", s.toChars());
return new DsymbolExp(loc, s);
}
}
/******************************
* Pull out callable entity with UFCS.
*/
private Expression resolveUFCS(Scope* sc, CallExp ce)
{
Loc loc = ce.loc;
Expression eleft;
Expression e;
if (ce.e1.op == TOK.dotIdentifier)
{
DotIdExp die = cast(DotIdExp)ce.e1;
Identifier ident = die.ident;
Expression ex = die.semanticX(sc);
if (ex != die)
{
ce.e1 = ex;
return null;
}
eleft = die.e1;
Type t = eleft.type.toBasetype();
if (t.ty == Tarray || t.ty == Tsarray || t.ty == Tnull || (t.isTypeBasic() && t.ty != Tvoid))
{
/* Built-in types and arrays have no callable properties, so do shortcut.
* It is necessary in: e.init()
*/
}
else if (t.ty == Taarray)
{
if (ident == Id.remove)
{
/* Transform:
* aa.remove(arg) into delete aa[arg]
*/
if (!ce.arguments || ce.arguments.dim != 1)
{
ce.error("expected key as argument to `aa.remove()`");
return new ErrorExp();
}
if (!eleft.type.isMutable())
{
ce.error("cannot remove key from `%s` associative array `%s`", MODtoChars(t.mod), eleft.toChars());
return new ErrorExp();
}
Expression key = (*ce.arguments)[0];
key = key.expressionSemantic(sc);
key = resolveProperties(sc, key);
TypeAArray taa = cast(TypeAArray)t;
key = key.implicitCastTo(sc, taa.index);
if (key.checkValue() || key.checkSharedAccess(sc))
return new ErrorExp();
semanticTypeInfo(sc, taa.index);
return new RemoveExp(loc, eleft, key);
}
}
else
{
if (Expression ey = die.semanticY(sc, 1))
{
if (ey.op == TOK.error)
return ey;
ce.e1 = ey;
if (isDotOpDispatch(ey))
{
uint errors = global.startGagging();
e = ce.syntaxCopy().expressionSemantic(sc);
if (!global.endGagging(errors))
return e;
// even opDispatch and UFCS must have valid arguments,
// so now that we've seen indication of a problem,
// check them for issues.
Expressions* originalArguments = Expression.arraySyntaxCopy(ce.arguments);
if (arrayExpressionSemantic(originalArguments, sc))
return new ErrorExp();
/* fall down to UFCS */
}
else
return null;
}
}
/* https://issues.dlang.org/show_bug.cgi?id=13953
*
* If a struct has an alias this to an associative array
* and remove is used on a struct instance, we have to
* check first if there is a remove function that can be called
* on the struct. If not we must check the alias this.
*
* struct A
* {
* string[string] a;
* alias a this;
* }
*
* void fun()
* {
* A s;
* s.remove("foo");
* }
*/
const errors = global.startGagging();
e = searchUFCS(sc, die, ident);
// if there were any errors and the identifier was remove
if (global.endGagging(errors))
{
if (ident == Id.remove)
{
// check alias this
Expression alias_e = resolveAliasThis(sc, die.e1, 1);
if (alias_e && alias_e != die.e1)
{
die.e1 = alias_e;
CallExp ce2 = cast(CallExp)ce.syntaxCopy();
ce2.e1 = die;
e = cast(CallExp)ce2.trySemantic(sc);
if (e)
return e;
}
}
// if alias this did not work out, print the initial errors
searchUFCS(sc, die, ident);
}
}
else if (ce.e1.op == TOK.dotTemplateInstance)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)ce.e1;
if (Expression ey = dti.semanticY(sc, 1))
{
ce.e1 = ey;
return null;
}
eleft = dti.e1;
e = searchUFCS(sc, dti, dti.ti.name);
}
else
return null;
// Rewrite
ce.e1 = e;
if (!ce.arguments)
ce.arguments = new Expressions();
ce.arguments.shift(eleft);
return null;
}
/******************************
* Pull out property with UFCS.
*/
private Expression resolveUFCSProperties(Scope* sc, Expression e1, Expression e2 = null)
{
Loc loc = e1.loc;
Expression eleft;
Expression e;
if (e1.op == TOK.dotIdentifier)
{
DotIdExp die = cast(DotIdExp)e1;
eleft = die.e1;
e = searchUFCS(sc, die, die.ident);
}
else if (e1.op == TOK.dotTemplateInstance)
{
DotTemplateInstanceExp dti;
dti = cast(DotTemplateInstanceExp)e1;
eleft = dti.e1;
e = searchUFCS(sc, dti, dti.ti.name);
}
else
return null;
if (e is null)
return null;
// Rewrite
if (e2)
{
// run semantic without gagging
e2 = e2.expressionSemantic(sc);
/* f(e1) = e2
*/
Expression ex = e.copy();
auto a1 = new Expressions(1);
(*a1)[0] = eleft;
ex = new CallExp(loc, ex, a1);
auto e1PassSemantic = ex.trySemantic(sc);
/* f(e1, e2)
*/
auto a2 = new Expressions(2);
(*a2)[0] = eleft;
(*a2)[1] = e2;
e = new CallExp(loc, e, a2);
e = e.trySemantic(sc);
if (!e1PassSemantic && !e)
{
/* https://issues.dlang.org/show_bug.cgi?id=20448
*
* If both versions have failed to pass semantic,
* f(e1) = e2 gets priority in error printing
* because f might be a templated function that
* failed to instantiate and we have to print
* the instantiation errors.
*/
return e1.expressionSemantic(sc);
}
else if (ex && !e)
{
checkPropertyCall(ex);
ex = new AssignExp(loc, ex, e2);
return ex.expressionSemantic(sc);
}
else
{
// strict setter prints errors if fails
e = e.expressionSemantic(sc);
}
checkPropertyCall(e);
return e;
}
else
{
/* f(e1)
*/
auto arguments = new Expressions(1);
(*arguments)[0] = eleft;
e = new CallExp(loc, e, arguments);
e = e.expressionSemantic(sc);
checkPropertyCall(e);
return e.expressionSemantic(sc);
}
}
/******************************
* If e1 is a property function (template), resolve it.
*/
Expression resolvePropertiesOnly(Scope* sc, Expression e1)
{
//printf("e1 = %s %s\n", Token::toChars(e1.op), e1.toChars());
Expression handleOverloadSet(OverloadSet os)
{
assert(os);
foreach (s; os.a)
{
auto fd = s.isFuncDeclaration();
auto td = s.isTemplateDeclaration();
if (fd)
{
if ((cast(TypeFunction)fd.type).isproperty)
return resolveProperties(sc, e1);
}
else if (td && td.onemember && (fd = td.onemember.isFuncDeclaration()) !is null)
{
if ((cast(TypeFunction)fd.type).isproperty ||
(fd.storage_class2 & STC.property) ||
(td._scope.stc & STC.property))
return resolveProperties(sc, e1);
}
}
return e1;
}
Expression handleTemplateDecl(TemplateDeclaration td)
{
assert(td);
if (td.onemember)
{
if (auto fd = td.onemember.isFuncDeclaration())
{
if ((cast(TypeFunction)fd.type).isproperty ||
(fd.storage_class2 & STC.property) ||
(td._scope.stc & STC.property))
return resolveProperties(sc, e1);
}
}
return e1;
}
Expression handleFuncDecl(FuncDeclaration fd)
{
assert(fd);
if ((cast(TypeFunction)fd.type).isproperty)
return resolveProperties(sc, e1);
return e1;
}
if (auto de = e1.isDotExp())
{
if (auto os = de.e2.isOverExp())
return handleOverloadSet(os.vars);
}
else if (auto oe = e1.isOverExp())
return handleOverloadSet(oe.vars);
else if (auto dti = e1.isDotTemplateInstanceExp())
{
if (dti.ti.tempdecl)
if (auto td = dti.ti.tempdecl.isTemplateDeclaration())
return handleTemplateDecl(td);
}
else if (auto dte = e1.isDotTemplateExp())
return handleTemplateDecl(dte.td);
else if (e1.op == TOK.scope_)
{
Dsymbol s = (cast(ScopeExp)e1).sds;
TemplateInstance ti = s.isTemplateInstance();
if (ti && !ti.semanticRun && ti.tempdecl)
if (auto td = ti.tempdecl.isTemplateDeclaration())
return handleTemplateDecl(td);
}
else if (e1.op == TOK.template_)
return handleTemplateDecl((cast(TemplateExp)e1).td);
else if (e1.op == TOK.dotVariable && e1.type.ty == Tfunction)
{
DotVarExp dve = cast(DotVarExp)e1;
return handleFuncDecl(dve.var.isFuncDeclaration());
}
else if (e1.op == TOK.variable && e1.type && e1.type.ty == Tfunction && (sc.intypeof || !(cast(VarExp)e1).var.needThis()))
return handleFuncDecl((cast(VarExp)e1).var.isFuncDeclaration());
return e1;
}
/****************************************
* Turn symbol `s` into the expression it represents.
*
* Params:
* s = symbol to resolve
* loc = location of use of `s`
* sc = context
* hasOverloads = applies if `s` represents a function.
* true means it's overloaded and will be resolved later,
* false means it's the exact function symbol.
* Returns:
* `s` turned into an expression, `ErrorExp` if an error occurred
*/
Expression symbolToExp(Dsymbol s, const ref Loc loc, Scope *sc, bool hasOverloads)
{
static if (LOGSEMANTIC)
{
printf("DsymbolExp::resolve(%s %s)\n", s.kind(), s.toChars());
}
Lagain:
Expression e;
//printf("DsymbolExp:: %p '%s' is a symbol\n", this, toChars());
//printf("s = '%s', s.kind = '%s'\n", s.toChars(), s.kind());
Dsymbol olds = s;
Declaration d = s.isDeclaration();
if (d && (d.storage_class & STC.templateparameter))
{
s = s.toAlias();
}
else
{
if (!s.isFuncDeclaration()) // functions are checked after overloading
{
s.checkDeprecated(loc, sc);
if (d)
d.checkDisabled(loc, sc);
}
// https://issues.dlang.org/show_bug.cgi?id=12023
// if 's' is a tuple variable, the tuple is returned.
s = s.toAlias();
//printf("s = '%s', s.kind = '%s', s.needThis() = %p\n", s.toChars(), s.kind(), s.needThis());
if (s != olds && !s.isFuncDeclaration())
{
s.checkDeprecated(loc, sc);
if (d)
d.checkDisabled(loc, sc);
}
}
if (auto em = s.isEnumMember())
{
return em.getVarExp(loc, sc);
}
if (auto v = s.isVarDeclaration())
{
//printf("Identifier '%s' is a variable, type '%s'\n", s.toChars(), v.type.toChars());
if (sc.intypeof == 1 && !v.inuse)
v.dsymbolSemantic(sc);
if (!v.type || // during variable type inference
!v.type.deco && v.inuse) // during variable type semantic
{
if (v.inuse) // variable type depends on the variable itself
error(loc, "circular reference to %s `%s`", v.kind(), v.toPrettyChars());
else // variable type cannot be determined
error(loc, "forward reference to %s `%s`", v.kind(), v.toPrettyChars());
return new ErrorExp();
}
if (v.type.ty == Terror)
return new ErrorExp();
if ((v.storage_class & STC.manifest) && v._init)
{
if (v.inuse)
{
error(loc, "circular initialization of %s `%s`", v.kind(), v.toPrettyChars());
return new ErrorExp();
}
e = v.expandInitializer(loc);
v.inuse++;
e = e.expressionSemantic(sc);
v.inuse--;
return e;
}
// Change the ancestor lambdas to delegate before hasThis(sc) call.
if (v.checkNestedReference(sc, loc))
return new ErrorExp();
if (v.needThis() && hasThis(sc))
e = new DotVarExp(loc, new ThisExp(loc), v);
else
e = new VarExp(loc, v);
e = e.expressionSemantic(sc);
return e;
}
if (auto fld = s.isFuncLiteralDeclaration())
{
//printf("'%s' is a function literal\n", fld.toChars());
e = new FuncExp(loc, fld);
return e.expressionSemantic(sc);
}
if (auto f = s.isFuncDeclaration())
{
f = f.toAliasFunc();
if (!f.functionSemantic())
return new ErrorExp();
if (!hasOverloads && f.checkForwardRef(loc))
return new ErrorExp();
auto fd = s.isFuncDeclaration();
fd.type = f.type;
return new VarExp(loc, fd, hasOverloads);
}
if (OverDeclaration od = s.isOverDeclaration())
{
e = new VarExp(loc, od, true);
e.type = Type.tvoid;
return e;
}
if (OverloadSet o = s.isOverloadSet())
{
//printf("'%s' is an overload set\n", o.toChars());
return new OverExp(loc, o);
}
if (Import imp = s.isImport())
{
if (!imp.pkg)
{
.error(loc, "forward reference of import `%s`", imp.toChars());
return new ErrorExp();
}
auto ie = new ScopeExp(loc, imp.pkg);
return ie.expressionSemantic(sc);
}
if (Package pkg = s.isPackage())
{
auto ie = new ScopeExp(loc, pkg);
return ie.expressionSemantic(sc);
}
if (Module mod = s.isModule())
{
auto ie = new ScopeExp(loc, mod);
return ie.expressionSemantic(sc);
}
if (Nspace ns = s.isNspace())
{
auto ie = new ScopeExp(loc, ns);
return ie.expressionSemantic(sc);
}
if (Type t = s.getType())
{
return (new TypeExp(loc, t)).expressionSemantic(sc);
}
if (TupleDeclaration tup = s.isTupleDeclaration())
{
if (tup.needThis() && hasThis(sc))
e = new DotVarExp(loc, new ThisExp(loc), tup);
else
e = new TupleExp(loc, tup);
e = e.expressionSemantic(sc);
return e;
}
if (TemplateInstance ti = s.isTemplateInstance())
{
ti.dsymbolSemantic(sc);
if (!ti.inst || ti.errors)
return new ErrorExp();
s = ti.toAlias();
if (!s.isTemplateInstance())
goto Lagain;
e = new ScopeExp(loc, ti);
e = e.expressionSemantic(sc);
return e;
}
if (TemplateDeclaration td = s.isTemplateDeclaration())
{
Dsymbol p = td.toParentLocal();
FuncDeclaration fdthis = hasThis(sc);
AggregateDeclaration ad = p ? p.isAggregateDeclaration() : null;
if (fdthis && ad && fdthis.isMemberLocal() == ad && (td._scope.stc & STC.static_) == 0)
{
e = new DotTemplateExp(loc, new ThisExp(loc), td);
}
else