/
expression.d
7449 lines (6617 loc) · 206 KB
/
expression.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/expression.d, _expression.d)
* Documentation: https://dlang.org/phobos/dmd_expression.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/expression.d
*/
module dmd.expression;
import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.string;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.apply;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.gluelayer;
import dmd.canthrow;
import dmd.complex;
import dmd.constfold;
import dmd.ctfeexpr;
import dmd.ctorflow;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.delegatize;
import dmd.dimport;
import dmd.dinterpret;
import dmd.dmodule;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.escape;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.inline;
import dmd.mtype;
import dmd.nspace;
import dmd.objc;
import dmd.opover;
import dmd.optimize;
import dmd.root.ctfloat;
import dmd.root.filename;
import dmd.root.outbuffer;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.safe;
import dmd.sideeffect;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.utf;
import dmd.visitor;
enum LOGSEMANTIC = false;
void emplaceExp(T : Expression, Args...)(void* p, Args args)
{
scope tmp = new T(args);
memcpy(p, cast(void*)tmp, __traits(classInstanceSize, T));
}
void emplaceExp(T : UnionExp)(T* p, Expression e)
{
memcpy(p, cast(void*)e, e.size);
}
/****************************************
* Find the first non-comma expression.
* Params:
* e = Expressions connected by commas
* Returns:
* left-most non-comma expression
*/
inout(Expression) firstComma(inout Expression e)
{
Expression ex = cast()e;
while (ex.op == TOK.comma)
ex = (cast(CommaExp)ex).e1;
return cast(inout)ex;
}
/****************************************
* Find the last non-comma expression.
* Params:
* e = Expressions connected by commas
* Returns:
* right-most non-comma expression
*/
inout(Expression) lastComma(inout Expression e)
{
Expression ex = cast()e;
while (ex.op == TOK.comma)
ex = (cast(CommaExp)ex).e2;
return cast(inout)ex;
}
/*************************************************************
* Given var, get the
* right `this` pointer if var is in an outer class, but our
* existing `this` pointer is in an inner class.
* Params:
* loc = location to use for error messages
* sc = context
* ad = struct or class we need the correct `this` for
* e1 = existing `this`
* var = the specific member of ad we're accessing
* flag = if true, return `null` instead of throwing an error
* Returns:
* Expression representing the `this` for the var
*/
extern (C++) Expression getRightThis(const ref Loc loc, Scope* sc, AggregateDeclaration ad, Expression e1, Declaration var, int flag = 0)
{
//printf("\ngetRightThis(e1 = %s, ad = %s, var = %s)\n", e1.toChars(), ad.toChars(), var.toChars());
L1:
Type t = e1.type.toBasetype();
//printf("e1.type = %s, var.type = %s\n", e1.type.toChars(), var.type.toChars());
if (e1.op == TOK.objcClassReference)
{
// We already have an Objective-C class reference, just use that as 'this'.
return e1;
}
else if (ad && ad.isClassDeclaration && ad.isClassDeclaration.classKind == ClassKind.objc &&
var.isFuncDeclaration && var.isFuncDeclaration.isStatic &&
var.isFuncDeclaration.selector)
{
return new ObjcClassReferenceExp(e1.loc, cast(ClassDeclaration) ad);
}
/* If e1 is not the 'this' pointer for ad
*/
if (ad &&
!(t.ty == Tpointer && t.nextOf().ty == Tstruct && (cast(TypeStruct)t.nextOf()).sym == ad) &&
!(t.ty == Tstruct && (cast(TypeStruct)t).sym == ad))
{
ClassDeclaration cd = ad.isClassDeclaration();
ClassDeclaration tcd = t.isClassHandle();
/* e1 is the right this if ad is a base class of e1
*/
if (!cd || !tcd || !(tcd == cd || cd.isBaseOf(tcd, null)))
{
/* Only classes can be inner classes with an 'outer'
* member pointing to the enclosing class instance
*/
if (tcd && tcd.isNested())
{
/* e1 is the 'this' pointer for an inner class: tcd.
* Rewrite it as the 'this' pointer for the outer class.
*/
e1 = new DotVarExp(loc, e1, tcd.vthis);
e1.type = tcd.vthis.type;
e1.type = e1.type.addMod(t.mod);
// Do not call ensureStaticLinkTo()
//e1 = e1.semantic(sc);
// Skip up over nested functions, and get the enclosing
// class type.
int n = 0;
Dsymbol s;
for (s = tcd.toParent(); s && s.isFuncDeclaration(); s = s.toParent())
{
FuncDeclaration f = s.isFuncDeclaration();
if (f.vthis)
{
//printf("rewriting e1 to %s's this\n", f.toChars());
n++;
e1 = new VarExp(loc, f.vthis);
}
else
{
e1.error("need `this` of type `%s` to access member `%s` from static function `%s`", ad.toChars(), var.toChars(), f.toChars());
e1 = new ErrorExp();
return e1;
}
}
if (s && s.isClassDeclaration())
{
e1.type = s.isClassDeclaration().type;
e1.type = e1.type.addMod(t.mod);
if (n > 1)
e1 = e1.expressionSemantic(sc);
}
else
e1 = e1.expressionSemantic(sc);
goto L1;
}
/* Can't find a path from e1 to ad
*/
if (flag)
return null;
e1.error("`this` for `%s` needs to be type `%s` not type `%s`", var.toChars(), ad.toChars(), t.toChars());
return new ErrorExp();
}
}
return e1;
}
/****************************************
* Resolve a symbol `s` and wraps it in an expression object.
*
* Params:
* loc = location of use of `s`
* sc = context
* s = symbol to resolve
* 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 resolve(const ref Loc loc, Scope *sc, Dsymbol s, 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 (!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.toParent2();
FuncDeclaration fdthis = hasThis(sc);
AggregateDeclaration ad = p ? p.isAggregateDeclaration() : null;
if (fdthis && ad && isAggregate(fdthis.vthis.type) == ad && (td._scope.stc & STC.static_) == 0)
{
e = new DotTemplateExp(loc, new ThisExp(loc), td);
}
else
e = new TemplateExp(loc, td);
e = e.expressionSemantic(sc);
return e;
}
.error(loc, "%s `%s` is not a variable", s.kind(), s.toChars());
return new ErrorExp();
}
/*****************************************
* Determine if `this` is available by walking up the enclosing
* scopes until a function is found.
*
* Params:
* sc = where to start looking for the enclosing function
* Returns:
* Found function if it satisfies `isThis()`, otherwise `null`
*/
extern (C++) FuncDeclaration hasThis(Scope* sc)
{
//printf("hasThis()\n");
Dsymbol p = sc.parent;
while (p && p.isTemplateMixin())
p = p.parent;
FuncDeclaration fdthis = p ? p.isFuncDeclaration() : null;
//printf("fdthis = %p, '%s'\n", fdthis, fdthis ? fdthis.toChars() : "");
// Go upwards until we find the enclosing member function
FuncDeclaration fd = fdthis;
while (1)
{
if (!fd)
{
goto Lno;
}
if (!fd.isNested())
break;
Dsymbol parent = fd.parent;
while (1)
{
if (!parent)
goto Lno;
TemplateInstance ti = parent.isTemplateInstance();
if (ti)
parent = ti.parent;
else
break;
}
fd = parent.isFuncDeclaration();
}
if (!fd.isThis())
{
goto Lno;
}
assert(fd.vthis);
return fd;
Lno:
return null; // don't have 'this' available
}
/***********************************
* Determine if a `this` is needed to access `d`.
* Params:
* sc = context
* d = declaration to check
* Returns:
* true means a `this` is needed
*/
extern (C++) bool isNeedThisScope(Scope* sc, Declaration d)
{
if (sc.intypeof == 1)
return false;
AggregateDeclaration ad = d.isThis();
if (!ad)
return false;
//printf("d = %s, ad = %s\n", d.toChars(), ad.toChars());
for (Dsymbol s = sc.parent; s; s = s.toParent2())
{
//printf("\ts = %s %s, toParent2() = %p\n", s.kind(), s.toChars(), s.toParent2());
if (AggregateDeclaration ad2 = s.isAggregateDeclaration())
{
if (ad2 == ad)
return false;
else if (ad2.isNested())
continue;
else
return true;
}
if (FuncDeclaration f = s.isFuncDeclaration())
{
if (f.isMember2())
break;
}
}
return true;
}
/******************************
* 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;
}
/******************************
* If e1 is a property function (template), resolve it.
*/
extern (C++) Expression resolvePropertiesOnly(Scope* sc, Expression e1)
{
//printf("e1 = %s %s\n", Token::toChars(e1.op), e1.toChars());
OverloadSet os;
FuncDeclaration fd;
TemplateDeclaration td;
if (e1.op == TOK.dot)
{
DotExp de = cast(DotExp)e1;
if (de.e2.op == TOK.overloadSet)
{
os = (cast(OverExp)de.e2).vars;
goto Los;
}
}
else if (e1.op == TOK.overloadSet)
{
os = (cast(OverExp)e1).vars;
Los:
assert(os);
foreach (s; os.a)
{
fd = s.isFuncDeclaration();
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);
}
}
}
}
else if (e1.op == TOK.dotTemplateInstance)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)e1;
if (dti.ti.tempdecl && (td = dti.ti.tempdecl.isTemplateDeclaration()) !is null)
goto Ltd;
}
else if (e1.op == TOK.dotTemplateDeclaration)
{
td = (cast(DotTemplateExp)e1).td;
goto Ltd;
}
else if (e1.op == TOK.scope_)
{
Dsymbol s = (cast(ScopeExp)e1).sds;
TemplateInstance ti = s.isTemplateInstance();
if (ti && !ti.semanticRun && ti.tempdecl)
{
if ((td = ti.tempdecl.isTemplateDeclaration()) !is null)
goto Ltd;
}
}
else if (e1.op == TOK.template_)
{
td = (cast(TemplateExp)e1).td;
Ltd:
assert(td);
if (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);
}
}
}
else if (e1.op == TOK.dotVariable && e1.type.ty == Tfunction)
{
DotVarExp dve = cast(DotVarExp)e1;
fd = dve.var.isFuncDeclaration();
goto Lfd;
}
else if (e1.op == TOK.variable && e1.type.ty == Tfunction && (sc.intypeof || !(cast(VarExp)e1).var.needThis()))
{
fd = (cast(VarExp)e1).var.isFuncDeclaration();
Lfd:
assert(fd);
if ((cast(TypeFunction)fd.type).isproperty)
return resolveProperties(sc, e1);
}
return e1;
}
/******************************
* 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;
Dsymbol sold = void;
if (global.params.bug10378 || global.params.check10378)
{
sold = searchScopes(flags | IgnoreSymbolVisibility);
if (!global.params.check10378)
{
s = sold;
goto Lsearchdone;
}
}
// First look in local scopes
s = searchScopes(flags | SearchLocalsOnly);
if (!s)
{
// Second look in imported modules
s = searchScopes(flags | SearchImportsOnly);
/** Still find private symbols, so that symbols that weren't access
* checked by the compiler remain usable. Once the deprecation is over,
* this should be moved to search_correct instead.
*/
if (!s && !(flags & IgnoreSymbolVisibility))
{
s = searchScopes(flags | SearchLocalsOnly | IgnoreSymbolVisibility);
if (!s)
s = searchScopes(flags | SearchImportsOnly | IgnoreSymbolVisibility);
if (s)
.deprecation(loc, "`%s` is not visible from module `%s`", s.toPrettyChars(), sc._module.toChars());
}
}
if (global.params.check10378)
{
alias snew = s;
if (sold !is snew)
Scope.deprecation10378(loc, sold, snew);
if (global.params.bug10378)
s = sold;
}
Lsearchdone:
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);
}
}
/******************************
* check e is exp.opDispatch!(tiargs) or not
* It's used to switch to UFCS the semantic analysis path
*/
extern (C++) bool isDotOpDispatch(Expression e)
{
return e.op == TOK.dotTemplateInstance && (cast(DotTemplateInstanceExp)e).ti.name == Id.opDispatch;
}
/******************************
* Pull out callable entity with UFCS.
*/
extern (C++) 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())
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;
/* fall down to UFCS */
}
else
return null;
}
}
e = 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.
*/
extern (C++) 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();
a1.setDim(1);
(*a1)[0] = eleft;
ex = new CallExp(loc, ex, a1);
ex = ex.trySemantic(sc);
/* f(e1, e2)
*/
auto a2 = new Expressions();
a2.setDim(2);
(*a2)[0] = eleft;
(*a2)[1] = e2;
e = new CallExp(loc, e, a2);
if (ex)
{
// if fallback setter exists, gag errors
e = e.trySemantic(sc);
if (!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();
arguments.setDim(1);
(*arguments)[0] = eleft;
e = new CallExp(loc, e, arguments);
e = e.expressionSemantic(sc);
checkPropertyCall(e);
return e.expressionSemantic(sc);
}
}
/******************************
* Perform semantic() on an array of Expressions.
*/
extern (C++) 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;
}
/****************************************
* Expand tuples.
* Input:
* exps aray of Expressions
* Output:
* exps rewritten in place
*/
extern (C++) void expandTuples(Expressions* exps)
{
//printf("expandTuples()\n");
if (exps)
{
for (size_t i = 0; i < exps.dim; i++)
{
Expression arg = (*exps)[i];