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dtemplate.d
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dtemplate.d
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2016 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.dtemplate;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import ddmd.aggregate;
import ddmd.aliasthis;
import ddmd.arraytypes;
import ddmd.attrib;
import ddmd.gluelayer;
import ddmd.dcast;
import ddmd.dclass;
import ddmd.declaration;
import ddmd.dmangle;
import ddmd.dmodule;
import ddmd.doc;
import ddmd.dscope;
import ddmd.dsymbol;
import ddmd.errors;
import ddmd.expression;
import ddmd.func;
import ddmd.globals;
import ddmd.hdrgen;
import ddmd.id;
import ddmd.identifier;
import ddmd.init;
import ddmd.mtype;
import ddmd.opover;
import ddmd.root.aav;
import ddmd.root.array;
import ddmd.root.outbuffer;
import ddmd.root.rootobject;
import ddmd.tokens;
import ddmd.visitor;
private enum LOG = false;
enum IDX_NOTFOUND = 0x12345678;
/********************************************
* These functions substitute for dynamic_cast. dynamic_cast does not work
* on earlier versions of gcc.
*/
extern (C++) Expression isExpression(RootObject o)
{
//return dynamic_cast<Expression *>(o);
if (!o || o.dyncast() != DYNCAST_EXPRESSION)
return null;
return cast(Expression)o;
}
extern (C++) Dsymbol isDsymbol(RootObject o)
{
//return dynamic_cast<Dsymbol *>(o);
if (!o || o.dyncast() != DYNCAST_DSYMBOL)
return null;
return cast(Dsymbol)o;
}
extern (C++) Type isType(RootObject o)
{
//return dynamic_cast<Type *>(o);
if (!o || o.dyncast() != DYNCAST_TYPE)
return null;
return cast(Type)o;
}
extern (C++) Tuple isTuple(RootObject o)
{
//return dynamic_cast<Tuple *>(o);
if (!o || o.dyncast() != DYNCAST_TUPLE)
return null;
return cast(Tuple)o;
}
extern (C++) Parameter isParameter(RootObject o)
{
//return dynamic_cast<Parameter *>(o);
if (!o || o.dyncast() != DYNCAST_PARAMETER)
return null;
return cast(Parameter)o;
}
/**************************************
* Is this Object an error?
*/
extern (C++) bool isError(RootObject o)
{
Type t = isType(o);
if (t)
return (t.ty == Terror);
Expression e = isExpression(o);
if (e)
return (e.op == TOKerror || !e.type || e.type.ty == Terror);
Tuple v = isTuple(o);
if (v)
return arrayObjectIsError(&v.objects);
Dsymbol s = isDsymbol(o);
assert(s);
if (s.errors)
return true;
return s.parent ? isError(s.parent) : false;
}
/**************************************
* Are any of the Objects an error?
*/
extern (C++) bool arrayObjectIsError(Objects* args)
{
for (size_t i = 0; i < args.dim; i++)
{
RootObject o = (*args)[i];
if (isError(o))
return true;
}
return false;
}
/***********************
* Try to get arg as a type.
*/
extern (C++) Type getType(RootObject o)
{
Type t = isType(o);
if (!t)
{
Expression e = isExpression(o);
if (e)
t = e.type;
}
return t;
}
extern (C++) Dsymbol getDsymbol(RootObject oarg)
{
//printf("getDsymbol()\n");
//printf("e %p s %p t %p v %p\n", isExpression(oarg), isDsymbol(oarg), isType(oarg), isTuple(oarg));
Dsymbol sa;
Expression ea = isExpression(oarg);
if (ea)
{
// Try to convert Expression to symbol
if (ea.op == TOKvar)
sa = (cast(VarExp)ea).var;
else if (ea.op == TOKfunction)
{
if ((cast(FuncExp)ea).td)
sa = (cast(FuncExp)ea).td;
else
sa = (cast(FuncExp)ea).fd;
}
else if (ea.op == TOKtemplate)
sa = (cast(TemplateExp)ea).td;
else
sa = null;
}
else
{
// Try to convert Type to symbol
Type ta = isType(oarg);
if (ta)
sa = ta.toDsymbol(null);
else
sa = isDsymbol(oarg); // if already a symbol
}
return sa;
}
extern (C++) Expression getValue(ref Dsymbol s)
{
Expression e = null;
if (s)
{
VarDeclaration v = s.isVarDeclaration();
if (v && v.storage_class & STCmanifest)
{
e = v.getConstInitializer();
}
}
return e;
}
/***********************
* Try to get value from manifest constant
*/
extern (C++) Expression getValue(Expression e)
{
if (e && e.op == TOKvar)
{
VarDeclaration v = (cast(VarExp)e).var.isVarDeclaration();
if (v && v.storage_class & STCmanifest)
{
e = v.getConstInitializer();
}
}
return e;
}
/******************************
* If o1 matches o2, return true.
* Else, return false.
*/
extern (C++) bool match(RootObject o1, RootObject o2)
{
static Expression getExpression(RootObject o)
{
auto s = isDsymbol(o);
return s ? .getValue(s) : .getValue(isExpression(o));
}
enum debugPrint = 0;
static if (debugPrint)
{
printf("match() o1 = %p %s (%d), o2 = %p %s (%d)\n",
o1, o1.toChars(), o1.dyncast(), o2, o2.toChars(), o2.dyncast());
}
/* A proper implementation of the various equals() overrides
* should make it possible to just do o1.equals(o2), but
* we'll do that another day.
*/
/* Manifest constants should be compared by their values,
* at least in template arguments.
*/
if (auto t1 = isType(o1))
{
auto t2 = isType(o2);
if (!t2)
goto Lnomatch;
static if (debugPrint)
{
printf("\tt1 = %s\n", t1.toChars());
printf("\tt2 = %s\n", t2.toChars());
}
if (!t1.equals(t2))
goto Lnomatch;
goto Lmatch;
}
if (auto e1 = getExpression(o1))
{
auto e2 = getExpression(o2);
if (!e2)
goto Lnomatch;
static if (debugPrint)
{
printf("\te1 = %s '%s' %s\n", e1.type.toChars(), Token.toChars(e1.op), e1.toChars());
printf("\te2 = %s '%s' %s\n", e2.type.toChars(), Token.toChars(e2.op), e2.toChars());
}
if (!e1.equals(e2))
goto Lnomatch;
goto Lmatch;
}
if (auto s1 = isDsymbol(o1))
{
auto s2 = isDsymbol(o2);
if (!s2)
goto Lnomatch;
static if (debugPrint)
{
printf("\ts1 = %s \n", s1.kind(), s1.toChars());
printf("\ts2 = %s \n", s2.kind(), s2.toChars());
}
if (!s1.equals(s2))
goto Lnomatch;
if (s1.parent != s2.parent && !s1.isFuncDeclaration() && !s2.isFuncDeclaration())
goto Lnomatch;
goto Lmatch;
}
if (auto u1 = isTuple(o1))
{
auto u2 = isTuple(o2);
if (!u2)
goto Lnomatch;
static if (debugPrint)
{
printf("\tu1 = %s\n", u1.toChars());
printf("\tu2 = %s\n", u2.toChars());
}
if (!arrayObjectMatch(&u1.objects, &u2.objects))
goto Lnomatch;
goto Lmatch;
}
Lmatch:
static if (debugPrint)
printf("\t-> match\n");
return true;
Lnomatch:
static if (debugPrint)
printf("\t-> nomatch\n");
return false;
}
/************************************
* Match an array of them.
*/
extern (C++) int arrayObjectMatch(Objects* oa1, Objects* oa2)
{
if (oa1 == oa2)
return 1;
if (oa1.dim != oa2.dim)
return 0;
for (size_t j = 0; j < oa1.dim; j++)
{
RootObject o1 = (*oa1)[j];
RootObject o2 = (*oa2)[j];
if (!match(o1, o2))
{
return 0;
}
}
return 1;
}
/************************************
* Return hash of Objects.
*/
extern (C++) hash_t arrayObjectHash(Objects* oa1)
{
hash_t hash = 0;
for (size_t j = 0; j < oa1.dim; j++)
{
/* Must follow the logic of match()
*/
RootObject o1 = (*oa1)[j];
if (Type t1 = isType(o1))
hash += cast(size_t)t1.deco;
else
{
Dsymbol s1 = isDsymbol(o1);
Expression e1 = s1 ? getValue(s1) : getValue(isExpression(o1));
if (e1)
{
if (e1.op == TOKint64)
{
IntegerExp ne = cast(IntegerExp)e1;
hash += cast(size_t)ne.getInteger();
}
}
else if (s1)
{
FuncAliasDeclaration fa1 = s1.isFuncAliasDeclaration();
if (fa1)
s1 = fa1.toAliasFunc();
hash += cast(size_t)cast(void*)s1.getIdent() + cast(size_t)cast(void*)s1.parent;
}
else if (Tuple u1 = isTuple(o1))
hash += arrayObjectHash(&u1.objects);
}
}
return hash;
}
extern (C++) RootObject objectSyntaxCopy(RootObject o)
{
if (!o)
return null;
if (Type t = isType(o))
return t.syntaxCopy();
if (Expression e = isExpression(o))
return e.syntaxCopy();
return o;
}
extern (C++) final class Tuple : RootObject
{
public:
Objects objects;
// kludge for template.isType()
override int dyncast()
{
return DYNCAST_TUPLE;
}
override const(char)* toChars()
{
return objects.toChars();
}
}
struct TemplatePrevious
{
TemplatePrevious* prev;
Scope* sc;
Objects* dedargs;
}
/***********************************************************
*/
extern (C++) final class TemplateDeclaration : ScopeDsymbol
{
public:
TemplateParameters* parameters; // array of TemplateParameter's
TemplateParameters* origParameters; // originals for Ddoc
Expression constraint;
// Hash table to look up TemplateInstance's of this TemplateDeclaration
TemplateInstance[TemplateInstanceBox] instances;
TemplateDeclaration overnext; // next overloaded TemplateDeclaration
TemplateDeclaration overroot; // first in overnext list
FuncDeclaration funcroot; // first function in unified overload list
Dsymbol onemember; // if !=null then one member of this template
bool literal; // this template declaration is a literal
bool ismixin; // template declaration is only to be used as a mixin
bool isstatic; // this is static template declaration
Prot protection;
// threaded list of previous instantiation attempts on stack
TemplatePrevious* previous;
extern (D) this(Loc loc, Identifier id, TemplateParameters* parameters, Expression constraint, Dsymbols* decldefs, bool ismixin = false, bool literal = false)
{
super(id);
static if (LOG)
{
printf("TemplateDeclaration(this = %p, id = '%s')\n", this, id.toChars());
}
version (none)
{
if (parameters)
for (int i = 0; i < parameters.dim; i++)
{
TemplateParameter tp = (*parameters)[i];
//printf("\tparameter[%d] = %p\n", i, tp);
TemplateTypeParameter ttp = tp.isTemplateTypeParameter();
if (ttp)
{
printf("\tparameter[%d] = %s : %s\n", i, tp.ident.toChars(), ttp.specType ? ttp.specType.toChars() : "");
}
}
}
this.loc = loc;
this.parameters = parameters;
this.origParameters = parameters;
this.constraint = constraint;
this.members = decldefs;
this.literal = literal;
this.ismixin = ismixin;
this.isstatic = true;
this.protection = Prot(PROTundefined);
// Compute in advance for Ddoc's use
// Bugzilla 11153: ident could be NULL if parsing fails.
if (members && ident)
{
Dsymbol s;
if (Dsymbol.oneMembers(members, &s, ident) && s)
{
onemember = s;
s.parent = this;
}
}
}
override Dsymbol syntaxCopy(Dsymbol)
{
//printf("TemplateDeclaration::syntaxCopy()\n");
TemplateParameters* p = null;
if (parameters)
{
p = new TemplateParameters();
p.setDim(parameters.dim);
for (size_t i = 0; i < p.dim; i++)
(*p)[i] = (*parameters)[i].syntaxCopy();
}
return new TemplateDeclaration(loc, ident, p, constraint ? constraint.syntaxCopy() : null, Dsymbol.arraySyntaxCopy(members), ismixin, literal);
}
override void semantic(Scope* sc)
{
static if (LOG)
{
printf("TemplateDeclaration::semantic(this = %p, id = '%s')\n", this, ident.toChars());
printf("sc->stc = %llx\n", sc.stc);
printf("sc->module = %s\n", sc._module.toChars());
}
if (semanticRun != PASSinit)
return; // semantic() already run
semanticRun = PASSsemantic;
// Remember templates defined in module object that we need to know about
if (sc._module && sc._module.ident == Id.object)
{
if (ident == Id.RTInfo)
Type.rtinfo = this;
}
/* Remember Scope for later instantiations, but make
* a copy since attributes can change.
*/
if (!this._scope)
{
this._scope = sc.copy();
this._scope.setNoFree();
}
parent = sc.parent;
protection = sc.protection;
isstatic = toParent().isModule() || (_scope.stc & STCstatic);
if (!isstatic)
{
if (auto ad = parent.pastMixin().isAggregateDeclaration())
ad.makeNested();
}
// Set up scope for parameters
auto paramsym = new ScopeDsymbol();
paramsym.parent = parent;
Scope* paramscope = sc.push(paramsym);
paramscope.stc = 0;
if (global.params.doDocComments)
{
origParameters = new TemplateParameters();
origParameters.setDim(parameters.dim);
for (size_t i = 0; i < parameters.dim; i++)
{
TemplateParameter tp = (*parameters)[i];
(*origParameters)[i] = tp.syntaxCopy();
}
}
for (size_t i = 0; i < parameters.dim; i++)
{
TemplateParameter tp = (*parameters)[i];
if (!tp.declareParameter(paramscope))
{
error(tp.loc, "parameter '%s' multiply defined", tp.ident.toChars());
errors = true;
}
if (!tp.semantic(paramscope, parameters))
{
errors = true;
}
if (i + 1 != parameters.dim && tp.isTemplateTupleParameter())
{
error("template tuple parameter must be last one");
errors = true;
}
}
/* Calculate TemplateParameter::dependent
*/
TemplateParameters tparams;
tparams.setDim(1);
for (size_t i = 0; i < parameters.dim; i++)
{
TemplateParameter tp = (*parameters)[i];
tparams[0] = tp;
for (size_t j = 0; j < parameters.dim; j++)
{
// Skip cases like: X(T : T)
if (i == j)
continue;
if (TemplateTypeParameter ttp = (*parameters)[j].isTemplateTypeParameter())
{
if (reliesOnTident(ttp.specType, &tparams))
tp.dependent = true;
}
else if (TemplateAliasParameter tap = (*parameters)[j].isTemplateAliasParameter())
{
if (reliesOnTident(tap.specType, &tparams) ||
reliesOnTident(isType(tap.specAlias), &tparams))
{
tp.dependent = true;
}
}
}
}
paramscope.pop();
// Compute again
onemember = null;
if (members)
{
Dsymbol s;
if (Dsymbol.oneMembers(members, &s, ident) && s)
{
onemember = s;
s.parent = this;
}
}
/* BUG: should check:
* o no virtual functions or non-static data members of classes
*/
}
/**********************************
* Overload existing TemplateDeclaration 'this' with the new one 's'.
* Return true if successful; i.e. no conflict.
*/
override bool overloadInsert(Dsymbol s)
{
static if (LOG)
{
printf("TemplateDeclaration::overloadInsert('%s')\n", s.toChars());
}
FuncDeclaration fd = s.isFuncDeclaration();
if (fd)
{
if (funcroot)
return funcroot.overloadInsert(fd);
funcroot = fd;
return funcroot.overloadInsert(this);
}
TemplateDeclaration td = s.isTemplateDeclaration();
if (!td)
return false;
TemplateDeclaration pthis = this;
TemplateDeclaration* ptd;
for (ptd = &pthis; *ptd; ptd = &(*ptd).overnext)
{
}
td.overroot = this;
*ptd = td;
static if (LOG)
{
printf("\ttrue: no conflict\n");
}
return true;
}
override bool hasStaticCtorOrDtor()
{
return false; // don't scan uninstantiated templates
}
override const(char)* kind() const
{
return (onemember && onemember.isAggregateDeclaration()) ? onemember.kind() : "template";
}
override const(char)* toChars()
{
if (literal)
return Dsymbol.toChars();
OutBuffer buf;
HdrGenState hgs;
buf.writestring(ident.toChars());
buf.writeByte('(');
for (size_t i = 0; i < parameters.dim; i++)
{
TemplateParameter tp = (*parameters)[i];
if (i)
buf.writestring(", ");
.toCBuffer(tp, &buf, &hgs);
}
buf.writeByte(')');
if (onemember)
{
FuncDeclaration fd = onemember.isFuncDeclaration();
if (fd && fd.type)
{
TypeFunction tf = cast(TypeFunction)fd.type;
buf.writestring(parametersTypeToChars(tf.parameters, tf.varargs));
}
}
if (constraint)
{
buf.writestring(" if (");
.toCBuffer(constraint, &buf, &hgs);
buf.writeByte(')');
}
return buf.extractString();
}
override Prot prot()
{
return protection;
}
/****************************
* Check to see if constraint is satisfied.
*/
bool evaluateConstraint(TemplateInstance ti, Scope* sc, Scope* paramscope, Objects* dedargs, FuncDeclaration fd)
{
/* Detect recursive attempts to instantiate this template declaration,
* Bugzilla 4072
* void foo(T)(T x) if (is(typeof(foo(x)))) { }
* static assert(!is(typeof(foo(7))));
* Recursive attempts are regarded as a constraint failure.
*/
/* There's a chicken-and-egg problem here. We don't know yet if this template
* instantiation will be a local one (enclosing is set), and we won't know until
* after selecting the correct template. Thus, function we're nesting inside
* is not on the sc scope chain, and this can cause errors in FuncDeclaration::getLevel().
* Workaround the problem by setting a flag to relax the checking on frame errors.
*/
for (TemplatePrevious* p = previous; p; p = p.prev)
{
if (arrayObjectMatch(p.dedargs, dedargs))
{
//printf("recursive, no match p->sc=%p %p %s\n", p->sc, this, this->toChars());
/* It must be a subscope of p->sc, other scope chains are not recursive
* instantiations.
*/
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (scx == p.sc)
return false;
}
}
/* BUG: should also check for ref param differences
*/
}
TemplatePrevious pr;
pr.prev = previous;
pr.sc = paramscope;
pr.dedargs = dedargs;
previous = ≺ // add this to threaded list
uint nerrors = global.errors;
Scope* scx = paramscope.push(ti);
scx.parent = ti;
scx.tinst = null;
scx.minst = null;
assert(!ti.symtab);
if (fd)
{
/* Declare all the function parameters as variables and add them to the scope
* Making parameters is similar to FuncDeclaration::semantic3
*/
TypeFunction tf = cast(TypeFunction)fd.type;
assert(tf.ty == Tfunction);
scx.parent = fd;
Parameters* fparameters = tf.parameters;
int fvarargs = tf.varargs;
size_t nfparams = Parameter.dim(fparameters);
for (size_t i = 0; i < nfparams; i++)
{
Parameter fparam = Parameter.getNth(fparameters, i);
fparam.storageClass &= (STCin | STCout | STCref | STClazy | STCfinal | STC_TYPECTOR | STCnodtor);
fparam.storageClass |= STCparameter;
if (fvarargs == 2 && i + 1 == nfparams)
fparam.storageClass |= STCvariadic;
}
for (size_t i = 0; i < fparameters.dim; i++)
{
Parameter fparam = (*fparameters)[i];
if (!fparam.ident)
continue;
// don't add it, if it has no name
auto v = new VarDeclaration(loc, fparam.type, fparam.ident, null);
v.storage_class = fparam.storageClass;
v.semantic(scx);
if (!ti.symtab)
ti.symtab = new DsymbolTable();
if (!scx.insert(v))
error("parameter %s.%s is already defined", toChars(), v.toChars());
else
v.parent = fd;
}
if (isstatic)
fd.storage_class |= STCstatic;
fd.vthis = fd.declareThis(scx, fd.isThis());
}
Expression e = constraint.syntaxCopy();
scx = scx.startCTFE();
scx.flags |= SCOPEcondition | SCOPEconstraint;
assert(ti.inst is null);
ti.inst = ti; // temporary instantiation to enable genIdent()
//printf("\tscx->parent = %s %s\n", scx->parent->kind(), scx->parent->toPrettyChars());
e = e.semantic(scx);
e = resolveProperties(scx, e);
ti.inst = null;
ti.symtab = null;
scx = scx.endCTFE();
scx = scx.pop();
previous = pr.prev; // unlink from threaded list
if (nerrors != global.errors) // if any errors from evaluating the constraint, no match
return false;
if (e.op == TOKerror)
return false;
e = e.ctfeInterpret();
if (e.isBool(true))
{
}
else if (e.isBool(false))
return false;
else
{
e.error("constraint %s is not constant or does not evaluate to a bool", e.toChars());
}
return true;
}
/***************************************
* Given that ti is an instance of this TemplateDeclaration,
* deduce the types of the parameters to this, and store
* those deduced types in dedtypes[].
* Input:
* flag 1: don't do semantic() because of dummy types
* 2: don't change types in matchArg()
* Output:
* dedtypes deduced arguments
* Return match level.
*/
MATCH matchWithInstance(Scope* sc, TemplateInstance ti, Objects* dedtypes, Expressions* fargs, int flag)
{
enum LOGM = 0;
static if (LOGM)
{
printf("\n+TemplateDeclaration::matchWithInstance(this = %s, ti = %s, flag = %d)\n", toChars(), ti.toChars(), flag);
}
version (none)
{
printf("dedtypes->dim = %d, parameters->dim = %d\n", dedtypes.dim, parameters.dim);
if (ti.tiargs.dim)
printf("ti->tiargs->dim = %d, [0] = %p\n", ti.tiargs.dim, (*ti.tiargs)[0]);
}
MATCH m;
size_t dedtypes_dim = dedtypes.dim;
dedtypes.zero();
if (errors)
return MATCHnomatch;
size_t parameters_dim = parameters.dim;
int variadic = isVariadic() !is null;
// If more arguments than parameters, no match
if (ti.tiargs.dim > parameters_dim && !variadic)
{
static if (LOGM)
{
printf(" no match: more arguments than parameters\n");
}
return MATCHnomatch;
}
assert(dedtypes_dim == parameters_dim);
assert(dedtypes_dim >= ti.tiargs.dim || variadic);
assert(_scope);
// Set up scope for template parameters
auto paramsym = new ScopeDsymbol();
paramsym.parent = _scope.parent;
Scope* paramscope = _scope.push(paramsym);
paramscope.tinst = ti;
paramscope.minst = sc.minst;
paramscope.callsc = sc;
paramscope.stc = 0;
// Attempt type deduction
m = MATCHexact;
for (size_t i = 0; i < dedtypes_dim; i++)
{
MATCH m2;
TemplateParameter tp = (*parameters)[i];
Declaration sparam;
//printf("\targument [%d]\n", i);
static if (LOGM)
{
//printf("\targument [%d] is %s\n", i, oarg ? oarg->toChars() : "null");
TemplateTypeParameter ttp = tp.isTemplateTypeParameter();
if (ttp)
printf("\tparameter[%d] is %s : %s\n", i, tp.ident.toChars(), ttp.specType ? ttp.specType.toChars() : "");
}
m2 = tp.matchArg(ti.loc, paramscope, ti.tiargs, i, parameters, dedtypes, &sparam);
//printf("\tm2 = %d\n", m2);
if (m2 == MATCHnomatch)
{
version (none)
{
printf("\tmatchArg() for parameter %i failed\n", i);
}
goto Lnomatch;
}
if (m2 < m)
m = m2;
if (!flag)
sparam.semantic(paramscope);
if (!paramscope.insert(sparam)) // TODO: This check can make more early
{
// in TemplateDeclaration::semantic, and
// then we don't need to make sparam if flags == 0
goto Lnomatch;
}
}
if (!flag)
{
/* Any parameter left without a type gets the type of
* its corresponding arg
*/
for (size_t i = 0; i < dedtypes_dim; i++)
{
if (!(*dedtypes)[i])
{
assert(i < ti.tiargs.dim);
(*dedtypes)[i] = cast(Type)(*ti.tiargs)[i];
}
}
}
if (m > MATCHnomatch && constraint && !flag)
{
if (ti.hasNestedArgs(ti.tiargs, this.isstatic)) // TODO: should gag error
ti.parent = ti.enclosing;
else
ti.parent = this.parent;
// Similar to doHeaderInstantiation
FuncDeclaration fd = onemember ? onemember.isFuncDeclaration() : null;
if (fd)
{
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type.syntaxCopy();
fd = new FuncDeclaration(fd.loc, fd.endloc, fd.ident, fd.storage_class, tf);
fd.parent = ti;
fd.inferRetType = true;
// Shouldn't run semantic on default arguments and return type.
for (size_t i = 0; i < tf.parameters.dim; i++)
(*tf.parameters)[i].defaultArg = null;
tf.next = null;
// Resolve parameter types and 'auto ref's.
tf.fargs = fargs;
uint olderrors = global.startGagging();
fd.type = tf.semantic(loc, paramscope);
if (global.endGagging(olderrors))
{
assert(fd.type.ty != Tfunction);
goto Lnomatch;
}
assert(fd.type.ty == Tfunction);
fd.originalType = fd.type; // for mangling
}
// TODO: dedtypes => ti->tiargs ?
if (!evaluateConstraint(ti, sc, paramscope, dedtypes, fd))
goto Lnomatch;
}
static if (LOGM)
{
// Print out the results
printf("--------------------------\n");
printf("template %s\n", toChars());
printf("instance %s\n", ti.toChars());
if (m > MATCHnomatch)
{
for (size_t i = 0; i < dedtypes_dim; i++)
{