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expression.d
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expression.d
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2015 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
module ddmd.expression;
import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.string;
import ddmd.access;
import ddmd.aggregate;
import ddmd.aliasthis;
import ddmd.apply;
import ddmd.argtypes;
import ddmd.arrayop;
import ddmd.arraytypes;
import ddmd.attrib;
import ddmd.gluelayer;
import ddmd.canthrow;
import ddmd.clone;
import ddmd.complex;
import ddmd.constfold;
import ddmd.ctfeexpr;
import ddmd.dcast;
import ddmd.dclass;
import ddmd.declaration;
import ddmd.delegatize;
import ddmd.denum;
import ddmd.dimport;
import ddmd.dinterpret;
import ddmd.dmangle;
import ddmd.dmodule;
import ddmd.doc;
import ddmd.dscope;
import ddmd.dstruct;
import ddmd.dsymbol;
import ddmd.dtemplate;
import ddmd.errors;
import ddmd.func;
import ddmd.globals;
import ddmd.hdrgen;
import ddmd.id;
import ddmd.identifier;
import ddmd.imphint;
import ddmd.init;
import ddmd.inline;
import ddmd.intrange;
import ddmd.mars;
import ddmd.mtype;
import ddmd.nspace;
import ddmd.opover;
import ddmd.optimize;
import ddmd.parse;
import ddmd.root.aav;
import ddmd.root.file;
import ddmd.root.filename;
import ddmd.root.longdouble;
import ddmd.root.outbuffer;
import ddmd.root.port;
import ddmd.root.rmem;
import ddmd.root.rootobject;
import ddmd.sideeffect;
import ddmd.statement;
import ddmd.target;
import ddmd.tokens;
import ddmd.traits;
import ddmd.typinf;
import ddmd.utf;
import ddmd.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);
}
/*************************************************************
* Given var, we need to get the
* right 'this' pointer if var is in an outer class, but our
* existing 'this' pointer is in an inner class.
* Input:
* e1 existing 'this'
* ad struct or class we need the correct 'this' for
* var the specific member of ad we're accessing
*/
extern (C++) Expression getRightThis(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 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 checkNestedRef()
//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.semantic(sc);
}
else
e1 = e1.semantic(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;
}
/*****************************************
* Determine if 'this' is available.
* If it is, return the FuncDeclaration that has it.
*/
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())
{
//printf("test '%s'\n", fd->toChars());
goto Lno;
}
assert(fd.vthis);
return fd;
Lno:
return null; // don't have 'this' available
}
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())
{
//printf("\t ad2 = %s\n", ad2->toChars());
if (ad2 == ad)
return false;
else if (ad2.isNested())
continue;
else
return true;
}
if (FuncDeclaration f = s.isFuncDeclaration())
{
if (f.isFuncLiteralDeclaration() && f.isNested())
continue;
if (f.isMember2())
break;
}
}
return true;
}
/***************************************
* Pull out any properties.
*/
extern (C++) Expression resolvePropertiesX(Scope* sc, Expression e1, Expression e2 = null)
{
//printf("resolvePropertiesX, e1 = %s %s, e2 = %s\n", Token::toChars(e1->op), e1->toChars(), e2 ? e2->toChars() : NULL);
Loc loc = e1.loc;
OverloadSet os;
Dsymbol s;
Objects* tiargs;
Type tthis;
if (e1.op == TOKdot)
{
DotExp de = cast(DotExp)e1;
if (de.e2.op == TOKoverloadset)
{
tiargs = null;
tthis = de.e1.type;
os = (cast(OverExp)de.e2).vars;
goto Los;
}
}
else if (e1.op == TOKoverloadset)
{
tiargs = null;
tthis = null;
os = (cast(OverExp)e1).vars;
Los:
assert(os);
FuncDeclaration fd = null;
if (e2)
{
e2 = e2.semantic(sc);
if (e2.op == TOKerror)
return new ErrorExp();
e2 = resolveProperties(sc, e2);
Expressions a;
a.push(e2);
for (size_t i = 0; i < os.a.dim; i++)
{
FuncDeclaration f = resolveFuncCall(loc, sc, os.a[i], tiargs, tthis, &a, 1);
if (f)
{
if (f.errors)
return new ErrorExp();
fd = f;
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
}
}
if (fd)
{
Expression e = new CallExp(loc, e1, e2);
return e.semantic(sc);
}
}
{
for (size_t i = 0; i < os.a.dim; i++)
{
FuncDeclaration f = resolveFuncCall(loc, sc, os.a[i], tiargs, tthis, null, 1);
if (f)
{
if (f.errors)
return new ErrorExp();
fd = f;
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
if (!tf.isref && e2)
goto Leproplvalue;
}
}
if (fd)
{
Expression e = new CallExp(loc, e1);
if (e2)
e = new AssignExp(loc, e, e2);
return e.semantic(sc);
}
}
if (e2)
goto Leprop;
}
else if (e1.op == TOKdotti)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)e1;
if (!dti.findTempDecl(sc))
goto Leprop;
if (!dti.ti.semanticTiargs(sc))
goto Leprop;
tiargs = dti.ti.tiargs;
tthis = dti.e1.type;
if ((os = dti.ti.tempdecl.isOverloadSet()) !is null)
goto Los;
if ((s = dti.ti.tempdecl) !is null)
goto Lfd;
}
else if (e1.op == TOKdottd)
{
DotTemplateExp dte = cast(DotTemplateExp)e1;
s = dte.td;
tiargs = null;
tthis = dte.e1.type;
goto Lfd;
}
else if (e1.op == TOKscope)
{
s = (cast(ScopeExp)e1).sds;
if (s.isTemplateDeclaration())
{
tiargs = null;
tthis = null;
goto Lfd;
}
TemplateInstance ti = s.isTemplateInstance();
if (ti && !ti.semanticRun && ti.tempdecl)
{
//assert(ti->needsTypeInference(sc));
if (!ti.semanticTiargs(sc))
goto Leprop;
tiargs = ti.tiargs;
tthis = null;
if ((os = ti.tempdecl.isOverloadSet()) !is null)
goto Los;
if ((s = ti.tempdecl) !is null)
goto Lfd;
}
}
else if (e1.op == TOKtemplate)
{
s = (cast(TemplateExp)e1).td;
tiargs = null;
tthis = null;
goto Lfd;
}
else if (e1.op == TOKdotvar && e1.type && e1.type.toBasetype().ty == Tfunction)
{
DotVarExp dve = cast(DotVarExp)e1;
s = dve.var.isFuncDeclaration();
tiargs = null;
tthis = dve.e1.type;
goto Lfd;
}
else if (e1.op == TOKvar && e1.type && e1.type.toBasetype().ty == Tfunction)
{
s = (cast(VarExp)e1).var.isFuncDeclaration();
tiargs = null;
tthis = null;
Lfd:
assert(s);
if (e2)
{
e2 = e2.semantic(sc);
if (e2.op == TOKerror)
return new ErrorExp();
e2 = resolveProperties(sc, e2);
Expressions a;
a.push(e2);
FuncDeclaration fd = resolveFuncCall(loc, sc, s, tiargs, tthis, &a, 1);
if (fd && fd.type)
{
if (fd.errors)
return new ErrorExp();
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
Expression e = new CallExp(loc, e1, e2);
return e.semantic(sc);
}
}
{
FuncDeclaration fd = resolveFuncCall(loc, sc, s, tiargs, tthis, null, 1);
if (fd && fd.type)
{
if (fd.errors)
return new ErrorExp();
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
if (!e2 || tf.isref)
{
Expression e = new CallExp(loc, e1);
if (e2)
e = new AssignExp(loc, e, e2);
return e.semantic(sc);
}
}
}
if (FuncDeclaration fd = s.isFuncDeclaration())
{
// Keep better diagnostic message for invalid property usage of functions
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
Expression e = new CallExp(loc, e1, e2);
return e.semantic(sc);
}
if (e2)
goto Leprop;
}
if (e1.op == TOKvar)
{
VarExp ve = cast(VarExp)e1;
VarDeclaration v = ve.var.isVarDeclaration();
if (v && ve.checkPurity(sc, v))
return new ErrorExp();
}
if (e2)
return null;
if (e1.type && e1.op != TOKtype) // function type is not a property
{
/* Look for e1 being a lazy parameter; rewrite as delegate call
*/
if (e1.op == TOKvar)
{
VarExp ve = cast(VarExp)e1;
if (ve.var.storage_class & STClazy)
{
Expression e = new CallExp(loc, e1);
return e.semantic(sc);
}
}
else if (e1.op == TOKdotvar)
{
// Check for reading overlapped pointer field in @safe code.
VarDeclaration v = (cast(DotVarExp)e1).var.isVarDeclaration();
if (v && v.overlapped && sc.func && !sc.intypeof)
{
AggregateDeclaration ad = v.toParent2().isAggregateDeclaration();
if (ad && e1.type.hasPointers() && sc.func.setUnsafe())
{
e1.error("field %s.%s cannot be accessed in @safe code because it overlaps with a pointer", ad.toChars(), v.toChars());
return new ErrorExp();
}
}
}
else if (e1.op == TOKdot)
{
e1.error("expression has no value");
return new ErrorExp();
}
}
if (!e1.type)
{
error(loc, "cannot resolve type for %s", e1.toChars());
e1 = new ErrorExp();
}
return e1;
Leprop:
error(loc, "not a property %s", e1.toChars());
return new ErrorExp();
Leproplvalue:
error(loc, "%s is not an lvalue", e1.toChars());
return new ErrorExp();
}
extern (C++) Expression resolveProperties(Scope* sc, Expression e)
{
//printf("resolveProperties(%s)\n", e->toChars());
e = resolvePropertiesX(sc, e);
if (e.checkRightThis(sc))
return new ErrorExp();
return e;
}
/******************************
* Check the tail CallExp is really property function call.
*/
extern (C++) bool checkPropertyCall(Expression e, Expression emsg)
{
while (e.op == TOKcomma)
e = (cast(CommaExp)e).e2;
if (e.op == TOKcall)
{
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._scope)
{
ce.f.semantic(ce.f._scope);
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 == TOKdot)
{
DotExp de = cast(DotExp)e1;
if (de.e2.op == TOKoverloadset)
{
os = (cast(OverExp)de.e2).vars;
goto Los;
}
}
else if (e1.op == TOKoverloadset)
{
os = (cast(OverExp)e1).vars;
Los:
assert(os);
for (size_t i = 0; i < os.a.dim; i++)
{
Dsymbol s = os.a[i];
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 & STCproperty) || (td._scope.stc & STCproperty))
{
return resolveProperties(sc, e1);
}
}
}
}
else if (e1.op == TOKdotti)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)e1;
if (dti.ti.tempdecl && (td = dti.ti.tempdecl.isTemplateDeclaration()) !is null)
goto Ltd;
}
else if (e1.op == TOKdottd)
{
td = (cast(DotTemplateExp)e1).td;
goto Ltd;
}
else if (e1.op == TOKscope)
{
Dsymbol s = (cast(ScopeExp)e1).sds;
td = s.isTemplateDeclaration();
if (td)
goto Ltd;
TemplateInstance ti = s.isTemplateInstance();
if (ti && !ti.semanticRun && ti.tempdecl)
{
if ((td = ti.tempdecl.isTemplateDeclaration()) !is null)
goto Ltd;
}
}
else if (e1.op == TOKtemplate)
{
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 & STCproperty) || (td._scope.stc & STCproperty))
{
return resolveProperties(sc, e1);
}
}
}
else if (e1.op == TOKdotvar && e1.type.ty == Tfunction)
{
DotVarExp dve = cast(DotVarExp)e1;
fd = dve.var.isFuncDeclaration();
goto Lfd;
}
else if (e1.op == TOKvar && 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
*/
extern (C++) Expression searchUFCS(Scope* sc, UnaExp ue, Identifier ident)
{
Loc loc = ue.loc;
Dsymbol s = null;
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (!scx.scopesym)
continue;
s = scx.scopesym.search(loc, ident);
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;
}
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 == TOKdotti)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)ue;
auto ti = new TemplateInstance(loc, s.ident);
ti.tiargs = dti.ti.tiargs; // for better diagnostic message
if (!ti.updateTempDecl(sc, s))
return new ErrorExp();
return new ScopeExp(loc, ti);
}
else
{
return new DsymbolExp(loc, s, 1);
}
}
/******************************
* 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 == TOKdotti && (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 == TOKdotid)
{
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.semantic(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 == TOKerror)
return ey;
ce.e1 = ey;
if (isDotOpDispatch(ey))
{
uint errors = global.startGagging();
e = ce.syntaxCopy().semantic(sc);
if (!global.endGagging(errors))
return e;
/* fall down to UFCS */
}
else
return null;
}
}
e = searchUFCS(sc, die, ident);
}
else if (ce.e1.op == TOKdotti)
{
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 == TOKdotid)
{
DotIdExp die = cast(DotIdExp)e1;
eleft = die.e1;
e = searchUFCS(sc, die, die.ident);
}
else if (e1.op == TOKdotti)
{
DotTemplateInstanceExp dti;
dti = cast(DotTemplateInstanceExp)e1;
eleft = dti.e1;
e = searchUFCS(sc, dti, dti.ti.name);
}
else
return null;
// Rewrite
if (e2)
{
// run semantic without gagging
e2 = e2.semantic(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, e1);
ex = new AssignExp(loc, ex, e2);
return ex.semantic(sc);
}
}
else
{
// strict setter prints errors if fails
e = e.semantic(sc);
}
checkPropertyCall(e, e1);
return e;
}
else
{
/* f(e1)
*/
auto arguments = new Expressions();
arguments.setDim(1);
(*arguments)[0] = eleft;
e = new CallExp(loc, e, arguments);
e = e.semantic(sc);
checkPropertyCall(e, e1);
return e.semantic(sc);
}
}
/******************************
* Perform semantic() on an array of Expressions.
*/
extern (C++) bool arrayExpressionSemantic(Expressions* exps, Scope* sc, bool preserveErrors = false)
{
bool err = false;
if (exps)
{
for (size_t i = 0; i < exps.dim; i++)
{
Expression e = (*exps)[i];
if (e)
{
e = e.semantic(sc);
if (e.op == TOKerror)
err = true;
if (preserveErrors || e.op != TOKerror)
(*exps)[i] = e;
}
}
}
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];
if (!arg)
continue;
// Look for tuple with 0 members
if (arg.op == TOKtype)
{
TypeExp e = cast(TypeExp)arg;
if (e.type.toBasetype().ty == Ttuple)
{
TypeTuple tt = cast(TypeTuple)e.type.toBasetype();
if (!tt.arguments || tt.arguments.dim == 0)
{
exps.remove(i);
if (i == exps.dim)
return;
i--;
continue;
}
}
}
// Inline expand all the tuples
while (arg.op == TOKtuple)
{
TupleExp te = cast(TupleExp)arg;
exps.remove(i); // remove arg
exps.insert(i, te.exps); // replace with tuple contents
if (i == exps.dim)
return; // empty tuple, no more arguments
(*exps)[i] = Expression.combine(te.e0, (*exps)[i]);
arg = (*exps)[i];
}
}
}
}
/****************************************
* Expand alias this tuples.
*/
extern (C++) TupleDeclaration isAliasThisTuple(Expression e)
{
if (!e.type)
return null;
Type t = e.type.toBasetype();
Lagain:
if (Dsymbol s = t.toDsymbol(null))
{
AggregateDeclaration ad = s.isAggregateDeclaration();
if (ad)
{
s = ad.aliasthis;
if (s && s.isVarDeclaration())
{
TupleDeclaration td = s.isVarDeclaration().toAlias().isTupleDeclaration();
if (td && td.isexp)
return td;
}
if (Type att = t.aliasthisOf())
{
t = att;
goto Lagain;
}
}
}
return null;
}
extern (C++) int expandAliasThisTuples(Expressions* exps, size_t starti = 0)
{
if (!exps || exps.dim == 0)
return -1;
for (size_t u = starti; u < exps.dim; u++)
{
Expression exp = (*exps)[u];
TupleDeclaration td = isAliasThisTuple(exp);
if (td)
{
exps.remove(u);
for (size_t i = 0; i < td.objects.dim; ++i)
{
Expression e = isExpression((*td.objects)[i]);
assert(e);
assert(e.op == TOKdsymbol);
DsymbolExp se = cast(DsymbolExp)e;
Declaration d = se.s.isDeclaration();
assert(d);
e = new DotVarExp(exp.loc, exp, d);
assert(d.type);
e.type = d.type;