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dtemplate.d
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dtemplate.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Template implementation.
*
* 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/dtemplate.d, _dtemplate.d)
* Documentation: https://dlang.org/phobos/dmd_dtemplate.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/dtemplate.d
*/
module dmd.dtemplate;
import core.stdc.stdio;
import core.stdc.string;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arraytypes;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.dmangle;
import dmd.dmodule;
import dmd.dscope;
import dmd.dsymbol;
import dmd.dsymbolsem;
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.impcnvtab;
import dmd.init;
import dmd.initsem;
import dmd.mtype;
import dmd.opover;
import dmd.root.outbuffer;
import dmd.root.rootobject;
import dmd.semantic2;
import dmd.semantic3;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
import dmd.templateparamsem;
//debug = FindExistingInstance; // print debug stats of findExistingInstance
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++) inout(Expression) isExpression(inout RootObject o)
{
//return dynamic_cast<Expression *>(o);
if (!o || o.dyncast() != DYNCAST.expression)
return null;
return cast(inout(Expression))o;
}
extern (C++) inout(Dsymbol) isDsymbol(inout RootObject o)
{
//return dynamic_cast<Dsymbol *>(o);
if (!o || o.dyncast() != DYNCAST.dsymbol)
return null;
return cast(inout(Dsymbol))o;
}
extern (C++) inout(Type) isType(inout RootObject o)
{
//return dynamic_cast<Type *>(o);
if (!o || o.dyncast() != DYNCAST.type)
return null;
return cast(inout(Type))o;
}
extern (C++) inout(Tuple) isTuple(inout RootObject o)
{
//return dynamic_cast<Tuple *>(o);
if (!o || o.dyncast() != DYNCAST.tuple)
return null;
return cast(inout(Tuple))o;
}
extern (C++) inout(Parameter) isParameter(inout RootObject o)
{
//return dynamic_cast<Parameter *>(o);
if (!o || o.dyncast() != DYNCAST.parameter)
return null;
return cast(inout(Parameter))o;
}
/**************************************
* Is this Object an error?
*/
extern (C++) bool isError(const RootObject o)
{
if (const t = isType(o))
return (t.ty == Terror);
if (const e = isExpression(o))
return (e.op == TOK.error || !e.type || e.type.ty == Terror);
if (const v = isTuple(o))
return arrayObjectIsError(&v.objects);
const 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(const Objects* args)
{
foreach (const o; *args)
{
if (isError(o))
return true;
}
return false;
}
/***********************
* Try to get arg as a type.
*/
extern (C++) inout(Type) getType(inout RootObject o)
{
inout t = isType(o);
if (!t)
{
if (inout e = isExpression(o))
return 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;
if (Expression ea = isExpression(oarg))
{
// Try to convert Expression to symbol
if (ea.op == TOK.variable)
sa = (cast(VarExp)ea).var;
else if (ea.op == TOK.function_)
{
if ((cast(FuncExp)ea).td)
sa = (cast(FuncExp)ea).td;
else
sa = (cast(FuncExp)ea).fd;
}
else if (ea.op == TOK.template_)
sa = (cast(TemplateExp)ea).td;
else
sa = null;
}
else
{
// Try to convert Type to symbol
if (Type ta = isType(oarg))
sa = ta.toDsymbol(null);
else
sa = isDsymbol(oarg); // if already a symbol
}
return sa;
}
private Expression getValue(ref Dsymbol s)
{
if (s)
{
if (VarDeclaration v = s.isVarDeclaration())
{
if (v.storage_class & STC.manifest)
return v.getConstInitializer();
}
}
return null;
}
/***********************
* Try to get value from manifest constant
*/
private Expression getValue(Expression e)
{
if (e && e.op == TOK.variable)
{
VarDeclaration v = (cast(VarExp)e).var.isVarDeclaration();
if (v && v.storage_class & STC.manifest)
{
e = v.getConstInitializer();
}
}
return e;
}
private Expression getExpression(RootObject o)
{
auto s = isDsymbol(o);
return s ? .getValue(s) : .getValue(isExpression(o));
}
/******************************
* If o1 matches o2, return true.
* Else, return false.
*/
private bool match(RootObject o1, RootObject o2)
{
enum log = false;
static if (log)
{
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 (log)
{
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 (log)
{
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());
}
// two expressions can be equal although they do not have the same
// type; that happens when they have the same value. So check type
// as well as expression equality to ensure templates are properly
// matched.
if (!e1.type.equals(e2.type) || !e1.equals(e2))
goto Lnomatch;
goto Lmatch;
}
if (auto s1 = isDsymbol(o1))
{
auto s2 = isDsymbol(o2);
if (!s2)
goto Lnomatch;
static if (log)
{
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 (log)
{
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 (log)
printf("\t. match\n");
return true;
Lnomatch:
static if (log)
printf("\t. nomatch\n");
return false;
}
/************************************
* Match an array of them.
*/
private bool arrayObjectMatch(Objects* oa1, Objects* oa2)
{
if (oa1 == oa2)
return true;
if (oa1.dim != oa2.dim)
return false;
immutable oa1dim = oa1.dim;
auto oa1d = (*oa1).data;
auto oa2d = (*oa2).data;
foreach (j; 0 .. oa1dim)
{
RootObject o1 = oa1d[j];
RootObject o2 = oa2d[j];
if (!match(o1, o2))
{
return false;
}
}
return true;
}
/************************************
* Return hash of Objects.
*/
private hash_t arrayObjectHash(Objects* oa1)
{
import dmd.root.hash : mixHash;
hash_t hash = 0;
foreach (o1; *oa1)
{
/* Must follow the logic of match()
*/
if (auto t1 = isType(o1))
hash = mixHash(hash, cast(size_t)t1.deco);
else if (auto e1 = getExpression(o1))
hash = mixHash(hash, expressionHash(e1));
else if (auto s1 = isDsymbol(o1))
{
auto fa1 = s1.isFuncAliasDeclaration();
if (fa1)
s1 = fa1.toAliasFunc();
hash = mixHash(hash, mixHash(cast(size_t)cast(void*)s1.getIdent(), cast(size_t)cast(void*)s1.parent));
}
else if (auto u1 = isTuple(o1))
hash = mixHash(hash, arrayObjectHash(&u1.objects));
}
return hash;
}
/************************************
* Computes hash of expression.
* Handles all Expression classes and MUST match their equals method,
* i.e. e1.equals(e2) implies expressionHash(e1) == expressionHash(e2).
*/
private hash_t expressionHash(Expression e)
{
import dmd.root.ctfloat : CTFloat;
import dmd.root.hash : calcHash, mixHash;
switch (e.op)
{
case TOK.int64:
return cast(size_t) (cast(IntegerExp)e).getInteger();
case TOK.float64:
return CTFloat.hash((cast(RealExp)e).value);
case TOK.complex80:
auto ce = cast(ComplexExp)e;
return mixHash(CTFloat.hash(ce.toReal), CTFloat.hash(ce.toImaginary));
case TOK.identifier:
return cast(size_t)cast(void*) (cast(IdentifierExp)e).ident;
case TOK.null_:
return cast(size_t)cast(void*) (cast(NullExp)e).type;
case TOK.string_:
auto se = cast(StringExp)e;
return calcHash(se.string, se.len * se.sz);
case TOK.tuple:
{
auto te = cast(TupleExp)e;
size_t hash = 0;
hash += te.e0 ? expressionHash(te.e0) : 0;
foreach (elem; *te.exps)
hash = mixHash(hash, expressionHash(elem));
return hash;
}
case TOK.arrayLiteral:
{
auto ae = cast(ArrayLiteralExp)e;
size_t hash;
foreach (i; 0 .. ae.elements.dim)
hash = mixHash(hash, expressionHash(ae.getElement(i)));
return hash;
}
case TOK.assocArrayLiteral:
{
auto ae = cast(AssocArrayLiteralExp)e;
size_t hash;
foreach (i; 0 .. ae.keys.dim)
// reduction needs associative op as keys are unsorted (use XOR)
hash ^= mixHash(expressionHash((*ae.keys)[i]), expressionHash((*ae.values)[i]));
return hash;
}
case TOK.structLiteral:
{
auto se = cast(StructLiteralExp)e;
size_t hash;
foreach (elem; *se.elements)
hash = mixHash(hash, elem ? expressionHash(elem) : 0);
return hash;
}
case TOK.variable:
return cast(size_t)cast(void*) (cast(VarExp)e).var;
case TOK.function_:
return cast(size_t)cast(void*) (cast(FuncExp)e).fd;
default:
// no custom equals for this expression
assert((&e.equals).funcptr is &RootObject.equals);
// equals based on identity
return cast(size_t)cast(void*) e;
}
}
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
{
Objects objects;
// kludge for template.isType()
override DYNCAST dyncast() const
{
return DYNCAST.tuple;
}
override const(char)* toChars()
{
return objects.toChars();
}
}
struct TemplatePrevious
{
TemplatePrevious* prev;
Scope* sc;
Objects* dedargs;
}
/***********************************************************
*/
extern (C++) final class TemplateDeclaration : ScopeDsymbol
{
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;
int inuse; /// for recursive expansion detection
// threaded list of previous instantiation attempts on stack
TemplatePrevious* previous;
extern (D) this(const ref 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(Prot.Kind.undefined);
// Compute in advance for Ddoc's use
// https://issues.dlang.org/show_bug.cgi?id=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(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);
}
/**********************************
* 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,
* https://issues.dlang.org/show_bug.cgi?id=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
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 &= (STC.in_ | STC.out_ | STC.ref_ | STC.lazy_ | STC.final_ | STC.TYPECTOR | STC.nodtor);
fparam.storageClass |= STC.parameter;
if (fvarargs == 2 && i + 1 == nfparams)
{
fparam.storageClass |= STC.variadic;
/* Don't need to set STC.scope_ because this will only
* be evaluated at compile time
*/
}
}
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.dsymbolSemantic(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 |= STC.static_;
fd.vthis = fd.declareThis(scx, fd.isThis());
}
Expression e = constraint.syntaxCopy();
import dmd.staticcond;
assert(ti.inst is null);
ti.inst = ti; // temporary instantiation to enable genIdent()
scx.flags |= SCOPE.constraint;
bool errors;
bool result = evalStaticCondition(scx, constraint, e, errors);
ti.inst = null;
ti.symtab = null;
scx = scx.pop();
previous = pr.prev; // unlink from threaded list
if (errors)
return false;
return result;
}
/***************************************
* 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 MATCH.nomatch;
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 MATCH.nomatch;
}
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 = MATCH.exact;
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() : "");
}
inuse++;
m2 = tp.matchArg(ti.loc, paramscope, ti.tiargs, i, parameters, dedtypes, &sparam);
inuse--;
//printf("\tm2 = %d\n", m2);
if (m2 == MATCH.nomatch)
{
version (none)
{
printf("\tmatchArg() for parameter %i failed\n", i);
}
goto Lnomatch;
}
if (m2 < m)
m = m2;
if (!flag)
sparam.dsymbolSemantic(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 > MATCH.nomatch && 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.typeSemantic(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 > MATCH.nomatch)
{
for (size_t i = 0; i < dedtypes_dim; i++)
{
TemplateParameter tp = (*parameters)[i];
RootObject oarg;
printf(" [%d]", i);
if (i < ti.tiargs.dim)
oarg = (*ti.tiargs)[i];
else
oarg = null;
tp.print(oarg, (*dedtypes)[i]);
}
}
else
goto Lnomatch;
}
static if (LOGM)
{
printf(" match = %d\n", m);
}
goto Lret;
Lnomatch:
static if (LOGM)
{
printf(" no match\n");
}
m = MATCH.nomatch;
Lret:
paramscope.pop();
static if (LOGM)
{
printf("-TemplateDeclaration.matchWithInstance(this = %p, ti = %p) = %d\n", this, ti, m);
}
return m;
}
/********************************************
* Determine partial specialization order of 'this' vs td2.
* Returns:
* match this is at least as specialized as td2
* 0 td2 is more specialized than this
*/
MATCH leastAsSpecialized(Scope* sc, TemplateDeclaration td2, Expressions* fargs)
{
enum LOG_LEASTAS = 0;
static if (LOG_LEASTAS)
{
printf("%s.leastAsSpecialized(%s)\n", toChars(), td2.toChars());
}
/* This works by taking the template parameters to this template
* declaration and feeding them to td2 as if it were a template
* instance.
* If it works, then this template is at least as specialized
* as td2.