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template.c
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template.c
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/* Compiler implementation of the D programming language
* Copyright (c) 1999-2014 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
* https://github.com/D-Programming-Language/dmd/blob/master/src/template.c
*/
// Handle template implementation
#include <stdio.h>
#include <assert.h>
#include "root.h"
#include "aav.h"
#include "rmem.h"
#include "stringtable.h"
#include "mtype.h"
#include "template.h"
#include "init.h"
#include "expression.h"
#include "scope.h"
#include "module.h"
#include "aggregate.h"
#include "declaration.h"
#include "dsymbol.h"
#include "mars.h"
#include "dsymbol.h"
#include "identifier.h"
#include "hdrgen.h"
#include "id.h"
#include "attrib.h"
#include "tokens.h"
#define LOG 0
#define IDX_NOTFOUND (0x12345678) // index is not found
size_t templateParameterLookup(Type *tparam, TemplateParameters *parameters);
int arrayObjectMatch(Objects *oa1, Objects *oa2);
unsigned char deduceWildHelper(Type *t, Type **at, Type *tparam);
MATCH deduceTypeHelper(Type *t, Type **at, Type *tparam);
void mangleToBuffer(Expression *e, OutBuffer *buf);
// Glue layer
Symbol *toModuleAssert(Module *m);
Symbol *toModuleUnittest(Module *m);
Symbol *toModuleArray(Module *m);
/********************************************
* These functions substitute for dynamic_cast. dynamic_cast does not work
* on earlier versions of gcc.
*/
Expression *isExpression(RootObject *o)
{
//return dynamic_cast<Expression *>(o);
if (!o || o->dyncast() != DYNCAST_EXPRESSION)
return NULL;
return (Expression *)o;
}
Dsymbol *isDsymbol(RootObject *o)
{
//return dynamic_cast<Dsymbol *>(o);
if (!o || o->dyncast() != DYNCAST_DSYMBOL)
return NULL;
return (Dsymbol *)o;
}
Type *isType(RootObject *o)
{
//return dynamic_cast<Type *>(o);
if (!o || o->dyncast() != DYNCAST_TYPE)
return NULL;
return (Type *)o;
}
Tuple *isTuple(RootObject *o)
{
//return dynamic_cast<Tuple *>(o);
if (!o || o->dyncast() != DYNCAST_TUPLE)
return NULL;
return (Tuple *)o;
}
Parameter *isParameter(RootObject *o)
{
//return dynamic_cast<Parameter *>(o);
if (!o || o->dyncast() != DYNCAST_PARAMETER)
return NULL;
return (Parameter *)o;
}
/**************************************
* Is this Object an error?
*/
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?
*/
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.
*/
Type *getType(RootObject *o)
{
Type *t = isType(o);
if (!t)
{
Expression *e = isExpression(o);
if (e)
t = e->type;
}
return t;
}
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 = ((VarExp *)ea)->var;
else if (ea->op == TOKfunction)
{
if (((FuncExp *)ea)->td)
sa = ((FuncExp *)ea)->td;
else
sa = ((FuncExp *)ea)->fd;
}
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;
}
/***********************
* Try to get value from manifest constant
*/
Expression *getValue(Expression *e)
{
if (e && e->op == TOKvar)
{
VarDeclaration *v = ((VarExp *)e)->var->isVarDeclaration();
if (v && v->storage_class & STCmanifest)
{
e = v->getConstInitializer();
}
}
return e;
}
Expression *getValue(Dsymbol *&s)
{
Expression *e = NULL;
if (s)
{
VarDeclaration *v = s->isVarDeclaration();
if (v && v->storage_class & STCmanifest)
{
e = v->getConstInitializer();
}
}
return e;
}
/**********************************
* Return true if e could be valid only as a template value parameter.
* Return false if it might be an alias or tuple.
* (Note that even in this case, it could still turn out to be a value).
*/
bool definitelyValueParameter(Expression *e)
{
// None of these can be value parameters
if (e->op == TOKtuple || e->op == TOKimport ||
e->op == TOKtype || e->op == TOKdottype ||
e->op == TOKtemplate || e->op == TOKdottd ||
e->op == TOKfunction || e->op == TOKerror ||
e->op == TOKthis || e->op == TOKsuper)
return false;
if (e->op != TOKdotvar)
return true;
/* Template instantiations involving a DotVar expression are difficult.
* In most cases, they should be treated as a value parameter, and interpreted.
* But they might also just be a fully qualified name, which should be treated
* as an alias.
*/
// x.y.f cannot be a value
FuncDeclaration *f = ((DotVarExp *)e)->var->isFuncDeclaration();
if (f)
return false;
while (e->op == TOKdotvar)
{
e = ((DotVarExp *)e)->e1;
}
// this.x.y and super.x.y couldn't possibly be valid values.
if (e->op == TOKthis || e->op == TOKsuper)
return false;
// e.type.x could be an alias
if (e->op == TOKdottype)
return false;
// var.x.y is the only other possible form of alias
if (e->op != TOKvar)
return true;
VarDeclaration *v = ((VarExp *)e)->var->isVarDeclaration();
// func.x.y is not an alias
if (!v)
return true;
// TODO: Should we force CTFE if it is a global constant?
return false;
}
/******************************
* If o1 matches o2, return true.
* Else, return false.
*/
bool match(RootObject *o1, RootObject *o2)
{
Type *t1 = isType(o1);
Type *t2 = isType(o2);
Dsymbol *s1 = isDsymbol(o1);
Dsymbol *s2 = isDsymbol(o2);
Expression *e1 = s1 ? getValue(s1) : getValue(isExpression(o1));
Expression *e2 = s2 ? getValue(s2) : getValue(isExpression(o2));
Tuple *u1 = isTuple(o1);
Tuple *u2 = isTuple(o2);
//printf("\t match t1 %p t2 %p, e1 %p e2 %p, s1 %p s2 %p, u1 %p u2 %p\n", t1,t2,e1,e2,s1,s2,u1,u2);
/* 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 (t1)
{
//printf("t1 = %s\n", t1->toChars());
//printf("t2 = %s\n", t2->toChars());
if (!t2)
goto Lnomatch;
if (!t1->equals(t2))
goto Lnomatch;
}
else if (e1)
{
if (!e2)
goto Lnomatch;
#if 0
printf("match %d\n", e1->equals(e2));
printf("\te1 = %p %s %s %s\n", e1, e1->type->toChars(), Token::toChars(e1->op), e1->toChars());
printf("\te2 = %p %s %s %s\n", e2, e2->type->toChars(), Token::toChars(e2->op), e2->toChars());
#endif
if (!e1->equals(e2))
goto Lnomatch;
}
else if (s1)
{
if (s2)
{
if (!s1->equals(s2))
goto Lnomatch;
if (s1->parent != s2->parent &&
!s1->isFuncDeclaration() &&
!s2->isFuncDeclaration())
{
goto Lnomatch;
}
}
else
goto Lnomatch;
}
else if (u1)
{
if (!u2)
goto Lnomatch;
if (!arrayObjectMatch(&u1->objects, &u2->objects))
goto Lnomatch;
}
//printf("match\n");
return true; // match
Lnomatch:
//printf("nomatch\n");
return false; // nomatch;
}
/************************************
* Match an array of them.
*/
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.
*/
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 += (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 = (IntegerExp *)e1;
hash += (size_t)ne->getInteger();
}
}
else if (s1)
{
FuncAliasDeclaration *fa1 = s1->isFuncAliasDeclaration();
if (fa1)
s1 = fa1->toAliasFunc();
hash += (size_t)(void *)s1->getIdent() + (size_t)(void *)s1->parent;
}
else if (Tuple *u1 = isTuple(o1))
hash += arrayObjectHash(&u1->objects);
}
}
return hash;
}
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;
}
/* ======================== TemplateDeclaration ============================= */
TemplateDeclaration::TemplateDeclaration(Loc loc, Identifier *id,
TemplateParameters *parameters, Expression *constraint, Dsymbols *decldefs, bool ismixin, bool literal)
: ScopeDsymbol(id)
{
#if LOG
printf("TemplateDeclaration(this = %p, id = '%s')\n", this, id->toChars());
#endif
#if 0
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() : "");
}
}
#endif
this->loc = loc;
this->parameters = parameters;
this->origParameters = parameters;
this->constraint = constraint;
this->members = decldefs;
this->overnext = NULL;
this->overroot = NULL;
this->funcroot = NULL;
this->onemember = NULL;
this->literal = literal;
this->ismixin = ismixin;
this->isstatic = true;
this->previous = NULL;
this->protection = Prot(PROTundefined);
this->numinstances = 0;
// 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;
}
}
}
Dsymbol *TemplateDeclaration::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);
}
void TemplateDeclaration::semantic(Scope *sc)
{
#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());
#endif
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();
}
// Set up scope for parameters
ScopeDsymbol *paramsym = new ScopeDsymbol();
paramsym->parent = sc->parent;
Scope *paramscope = sc->push(paramsym);
paramscope->stc = 0;
if (!parent)
parent = sc->parent;
isstatic = toParent()->isModule() || (scope->stc & STCstatic);
protection = sc->protection;
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
*/
}
const char *TemplateDeclaration::kind()
{
return (onemember && onemember->isAggregateDeclaration())
? onemember->kind()
: (char *)"template";
}
/**********************************
* Overload existing TemplateDeclaration 'this' with the new one 's'.
* Return true if successful; i.e. no conflict.
*/
bool TemplateDeclaration::overloadInsert(Dsymbol *s)
{
#if LOG
printf("TemplateDeclaration::overloadInsert('%s')\n", s->toChars());
#endif
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;
#if LOG
printf("\ttrue: no conflict\n");
#endif
return true;
}
/****************************
* Check to see if constraint is satisfied.
*/
bool TemplateDeclaration::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
unsigned int 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 = (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
VarDeclaration *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 == 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 TemplateDeclaration::matchWithInstance(Scope *sc, TemplateInstance *ti,
Objects *dedtypes, Expressions *fargs, int flag)
{
#define LOGM 0
#if LOGM
printf("\n+TemplateDeclaration::matchWithInstance(this = %s, ti = %s, flag = %d)\n", toChars(), ti->toChars(), flag);
#endif
#if 0
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]);
#endif
MATCH m;
size_t dedtypes_dim = dedtypes->dim;
dedtypes->zero();
if (errors)
return MATCHnomatch;
size_t parameters_dim = parameters->dim;
int variadic = isVariadic() != NULL;
// If more arguments than parameters, no match
if (ti->tiargs->dim > parameters_dim && !variadic)
{
#if LOGM
printf(" no match: more arguments than parameters\n");
#endif
return MATCHnomatch;
}
assert(dedtypes_dim == parameters_dim);
assert(dedtypes_dim >= ti->tiargs->dim || variadic);
assert(scope);
// Set up scope for template parameters
ScopeDsymbol *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);
#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() : "");
#endif
m2 = tp->matchArg(ti->loc, paramscope, ti->tiargs, i, parameters, dedtypes, &sparam);
//printf("\tm2 = %d\n", m2);
if (m2 == MATCHnomatch)
{
#if 0
printf("\tmatchArg() for parameter %i failed\n", i);
#endif
goto Lnomatch;
}
if (m2 < m)
m = m2;
if (!flag)
sparam->semantic(paramscope);
if (!paramscope->insert(sparam)) // TODO: This check can make more early
goto Lnomatch; // in TemplateDeclaration::semantic, and
// then we don't need to make sparam if flags == 0
}
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] = (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 = (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;
unsigned 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;
}
#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++)
{
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;
#endif
#if LOGM
printf(" match = %d\n", m);
#endif
goto Lret;
Lnomatch:
#if LOGM
printf(" no match\n");
#endif
m = MATCHnomatch;
Lret:
paramscope->pop();
#if LOGM
printf("-TemplateDeclaration::matchWithInstance(this = %p, ti = %p) = %d\n", this, ti, m);
#endif
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 TemplateDeclaration::leastAsSpecialized(Scope *sc, TemplateDeclaration *td2, Expressions *fargs)
{
#define LOG_LEASTAS 0
#if LOG_LEASTAS
printf("%s.leastAsSpecialized(%s)\n", toChars(), td2->toChars());
#endif
/* This works by taking the template parameters to this template
* declaration and feeding them to td2 as if it were a template
* instance.