projects/ldc: dmd2/func.c comparison

comparison dmd2/func.c @ 758:f04dde6e882c

Added initial D2 support, D2 frontend and changes to codegen to make things compile.

author	Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date	Tue, 11 Nov 2008 01:38:48 +0100
parents
children	356e65836fb5

comparison

equal deleted inserted replaced

-:2c730d530c98
+:f04dde6e882c
+// Compiler implementation of the D programming language
+// Copyright (c) 1999-2008 by Digital Mars
+// All Rights Reserved
+// written by Walter Bright
+// http://www.digitalmars.com
+// License for redistribution is by either the Artistic License
+// in artistic.txt, or the GNU General Public License in gnu.txt.
+// See the included readme.txt for details.
+#include <stdio.h>
+#include <assert.h>
+#include "mars.h"
+#include "init.h"
+#include "declaration.h"
+#include "attrib.h"
+#include "expression.h"
+#include "scope.h"
+#include "mtype.h"
+#include "aggregate.h"
+#include "identifier.h"
+#include "id.h"
+#include "module.h"
+#include "statement.h"
+#include "template.h"
+#include "hdrgen.h"
+#ifdef IN_GCC
+#include "d-dmd-gcc.h"
+#endif
+/********************************* FuncDeclaration ****************************/
+FuncDeclaration::FuncDeclaration(Loc loc, Loc endloc, Identifier *id, enum STC storage_class, Type *type)
+: Declaration(id)
+{
+//printf("FuncDeclaration(id = '%s', type = %p)\n", id->toChars(), type);
+this->storage_class = storage_class;
+this->type = type;
+this->loc = loc;
+this->endloc = endloc;
+fthrows = NULL;
+frequire = NULL;
+outId = NULL;
+vresult = NULL;
+returnLabel = NULL;
+fensure = NULL;
+fbody = NULL;
+localsymtab = NULL;
+vthis = NULL;
+v_arguments = NULL;
+#if IN_GCC
+v_argptr = NULL;
+#endif
+parameters = NULL;
+labtab = NULL;
+overnext = NULL;
+vtblIndex = -1;
+hasReturnExp = 0;
+naked = 0;
+inlineStatus = ILSuninitialized;
+inlineNest = 0;
+inlineAsm = 0;
+cantInterpret = 0;
+semanticRun = 0;
+fes = NULL;
+introducing = 0;
+tintro = NULL;
+/* The type given for "infer the return type" is a TypeFunction with
+* NULL for the return type.
+*/
+inferRetType = (type && type->nextOf() == NULL);
+scope = NULL;
+hasReturnExp = 0;
+nrvo_can = 1;
+nrvo_var = NULL;
+shidden = NULL;
+builtin = BUILTINunknown;
+tookAddressOf = 0;
+// LDC
+isArrayOp = false;
+}
+Dsymbol *FuncDeclaration::syntaxCopy(Dsymbol *s)
+{
+FuncDeclaration *f;
+//printf("FuncDeclaration::syntaxCopy('%s')\n", toChars());
+if (s)
+	f = (FuncDeclaration *)s;
+else
+	f = new FuncDeclaration(loc, endloc, ident, (enum STC) storage_class, type->syntaxCopy());
+f->outId = outId;
+f->frequire = frequire ? frequire->syntaxCopy() : NULL;
+f->fensure  = fensure  ? fensure->syntaxCopy()  : NULL;
+f->fbody    = fbody    ? fbody->syntaxCopy()    : NULL;
+assert(!fthrows); // deprecated
+// LDC
+f->intrinsicName = intrinsicName;
+return f;
+}
+// Do the semantic analysis on the external interface to the function.
+void FuncDeclaration::semantic(Scope *sc)
+{   TypeFunction *f;
+StructDeclaration *sd;
+ClassDeclaration *cd;
+InterfaceDeclaration *id;
+Dsymbol *pd;
+#if 0
+printf("FuncDeclaration::semantic(sc = %p, this = %p, '%s', linkage = %d)\n", sc, this, toPrettyChars(), sc->linkage);
+if (isFuncLiteralDeclaration())
+	printf("\tFuncLiteralDeclaration()\n");
+printf("sc->parent = %s\n", sc->parent->toChars());
+printf("type: %p, %s\n", type, type->toChars());
+#endif
+storage_class |= sc->stc & ~STCref;
+//printf("function storage_class = x%x\n", storage_class);
+if (!originalType)
+	originalType = type;
+if (!type->deco && type->nextOf())
+{
+#if 1
+	/* Apply const and invariant storage class
+	 * to the function type
+	 */
+	type = type->semantic(loc, sc);
+	if (storage_class & STCinvariant)
+	{   // Don't use toInvariant(), as that will do a merge()
+	    type = type->makeInvariant();
+	    type->deco = type->merge()->deco;
+	}
+	else if (storage_class & STCconst)
+	{
+	    if (!type->isInvariant())
+	    {	// Don't use toConst(), as that will do a merge()
+		type = type->makeConst();
+		type->deco = type->merge()->deco;
+	    }
+	}
+#else
+	if (storage_class & (STCconst | STCinvariant))
+	{
+	    /* Apply const and invariant storage class
+	     * to the function's return type
+	     */
+	    Type *tn = type->nextOf();
+	    if (storage_class & STCconst)
+		tn = tn->makeConst();
+	    if (storage_class & STCinvariant)
+		tn = tn->makeInvariant();
+	    ((TypeNext *)type)->next = tn;
+	}
+	type = type->semantic(loc, sc);
+#endif
+}
+//type->print();
+if (type->ty != Tfunction)
+{
+	error("%s must be a function", toChars());
+	return;
+}
+f = (TypeFunction *)(type);
+size_t nparams = Argument::dim(f->parameters);
+linkage = sc->linkage;
+//    if (!parent)
+{
+	//parent = sc->scopesym;
+	parent = sc->parent;
+}
+protection = sc->protection;
+Dsymbol *parent = toParent();
+if (storage_class & STCscope)
+	error("functions cannot be scope");
+if (isAbstract() && !isVirtual())
+	error("non-virtual functions cannot be abstract");
+if ((f->isConst() || f->isInvariant()) && !isThis())
+	error("without 'this' cannot be const/invariant");
+if (isAbstract() && isFinal())
+	error("cannot be both final and abstract");
+#if 0
+if (isAbstract() && fbody)
+	error("abstract functions cannot have bodies");
+#endif
+#if 0
+if (isStaticConstructor() || isStaticDestructor())
+{
+	if (!isStatic() || type->nextOf()->ty != Tvoid)
+	    error("static constructors / destructors must be static void");
+	if (f->arguments && f->arguments->dim)
+	    error("static constructors / destructors must have empty parameter list");
+	// BUG: check for invalid storage classes
+}
+#endif
+#ifdef IN_GCC
+AggregateDeclaration *ad;
+ad = parent->isAggregateDeclaration();
+if (ad)
+	ad->methods.push(this);
+#endif
+sd = parent->isStructDeclaration();
+if (sd)
+{
+	if (isCtorDeclaration())
+	{
+	    return;
+	}
+#if 0
+	// Verify no constructors, destructors, etc.
+	if (isCtorDeclaration()
+	    //||isDtorDeclaration()
+	    //|| isInvariantDeclaration()
+	    //|| isUnitTestDeclaration()
+	   )
+	{
+	    error("special member functions not allowed for %ss", sd->kind());
+	}
+	if (!sd->inv)
+	    sd->inv = isInvariantDeclaration();
+	if (!sd->aggNew)
+	    sd->aggNew = isNewDeclaration();
+	if (isDelete())
+	{
+	    if (sd->aggDelete)
+		error("multiple delete's for struct %s", sd->toChars());
+	    sd->aggDelete = (DeleteDeclaration *)(this);
+	}
+#endif
+}
+id = parent->isInterfaceDeclaration();
+if (id)
+{
+	storage_class |= STCabstract;
+	if (isCtorDeclaration() ||
+	    isPostBlitDeclaration() ||
+	    isDtorDeclaration() ||
+	    isInvariantDeclaration() ||
+	    isUnitTestDeclaration() || isNewDeclaration() || isDelete())
+	    error("special function not allowed in interface %s", id->toChars());
+	if (fbody)
+	    error("function body is not abstract in interface %s", id->toChars());
+}
+/* Template member functions aren't virtual:
+*   interface TestInterface { void tpl(T)(); }
+* and so won't work in interfaces
+*/
+if ((pd = toParent()) != NULL &&
+	pd->isTemplateInstance() &&
+	(pd = toParent2()) != NULL &&
+	(id = pd->isInterfaceDeclaration()) != NULL)
+{
+	error("template member function not allowed in interface %s", id->toChars());
+}
+cd = parent->isClassDeclaration();
+if (cd)
+{	int vi;
+	CtorDeclaration *ctor;
+	DtorDeclaration *dtor;
+	InvariantDeclaration *inv;
+	if (isCtorDeclaration())
+	{
+//	    ctor = (CtorDeclaration *)this;
+//	    if (!cd->ctor)
+//		cd->ctor = ctor;
+	    return;
+	}
+#if 0
+	dtor = isDtorDeclaration();
+	if (dtor)
+	{
+	    if (cd->dtor)
+		error("multiple destructors for class %s", cd->toChars());
+	    cd->dtor = dtor;
+	}
+	inv = isInvariantDeclaration();
+	if (inv)
+	{
+	    cd->inv = inv;
+	}
+	if (isNewDeclaration())
+	{
+	    if (!cd->aggNew)
+		cd->aggNew = (NewDeclaration *)(this);
+	}
+	if (isDelete())
+	{
+	    if (cd->aggDelete)
+		error("multiple delete's for class %s", cd->toChars());
+	    cd->aggDelete = (DeleteDeclaration *)(this);
+	}
+#endif
+	if (storage_class & STCabstract)
+	    cd->isabstract = 1;
+	// if static function, do not put in vtbl[]
+	if (!isVirtual())
+	{
+	    //printf("\tnot virtual\n");
+	    goto Ldone;
+	}
+	// Find index of existing function in vtbl[] to override
+	vi = findVtblIndex(&cd->vtbl, cd->baseClass ? cd->baseClass->vtbl.dim : 0);
+	switch (vi)
+	{
+	    case -1:
+		/* Didn't find one, so
+		 * This is an 'introducing' function which gets a new
+		 * slot in the vtbl[].
+		 */
+		// Verify this doesn't override previous final function
+		if (cd->baseClass)
+		{   Dsymbol *s = cd->baseClass->search(loc, ident, 0);
+		    if (s)
+		    {
+			FuncDeclaration *f = s->isFuncDeclaration();
+			f = f->overloadExactMatch(type);
+			if (f && f->isFinal() && f->prot() != PROTprivate)
+			    error("cannot override final function %s", f->toPrettyChars());
+		    }
+		}
+		if (isFinal())
+		{
+		    cd->vtblFinal.push(this);
+		}
+		else
+		{
+		    // Append to end of vtbl[]
+		    //printf("\tintroducing function\n");
+		    introducing = 1;
+		    vi = cd->vtbl.dim;
+		    cd->vtbl.push(this);
+		    vtblIndex = vi;
+		}
+		break;
+	    case -2:	// can't determine because of fwd refs
+		cd->sizeok = 2;	// can't finish due to forward reference
+		return;
+	    default:
+	    {   FuncDeclaration *fdv = (FuncDeclaration *)cd->vtbl.data[vi];
+		// This function is covariant with fdv
+		if (fdv->isFinal())
+		    error("cannot override final function %s", fdv->toPrettyChars());
+#if DMDV2
+		if (!isOverride() && global.params.warnings)
+		    warning("%s: overrides base class function %s, but is not marked with 'override'", locToChars(), fdv->toPrettyChars());
+#endif
+		if (fdv->toParent() == parent)
+		{
+		    // If both are mixins, then error.
+		    // If either is not, the one that is not overrides
+		    // the other.
+		    if (fdv->parent->isClassDeclaration())
+			break;
+		    if (!this->parent->isClassDeclaration()
+#if !BREAKABI
+			&& !isDtorDeclaration()
+#endif
+#if DMDV2
+			&& !isPostBlitDeclaration()
+#endif
+			)
+			error("multiple overrides of same function");
+		}
+		cd->vtbl.data[vi] = (void *)this;
+		vtblIndex = vi;
+		/* This works by whenever this function is called,
+		 * it actually returns tintro, which gets dynamically
+		 * cast to type. But we know that tintro is a base
+		 * of type, so we could optimize it by not doing a
+		 * dynamic cast, but just subtracting the isBaseOf()
+		 * offset if the value is != null.
+		 */
+		if (fdv->tintro)
+		    tintro = fdv->tintro;
+		else if (!type->equals(fdv->type))
+		{
+		    /* Only need to have a tintro if the vptr
+		     * offsets differ
+		     */
+		    int offset;
+		    if (fdv->type->nextOf()->isBaseOf(type->nextOf(), &offset))
+		    {
+			tintro = fdv->type;
+		    }
+		}
+		break;
+	    }
+	}
+	/* Go through all the interface bases.
+	 * If this function is covariant with any members of those interface
+	 * functions, set the tintro.
+	 */
+	for (int i = 0; i < cd->interfaces_dim; i++)
+	{
+	    BaseClass *b = cd->interfaces[i];
+	    vi = findVtblIndex(&b->base->vtbl, b->base->vtbl.dim);
+	    switch (vi)
+	    {
+		case -1:
+		    break;
+		case -2:
+		    cd->sizeok = 2;	// can't finish due to forward reference
+		    return;
+		default:
+		{   FuncDeclaration *fdv = (FuncDeclaration *)b->base->vtbl.data[vi];
+		    Type *ti = NULL;
+		    if (fdv->tintro)
+			ti = fdv->tintro;
+		    else if (!type->equals(fdv->type))
+		    {
+			/* Only need to have a tintro if the vptr
+			 * offsets differ
+			 */
+			int offset;
+			if (fdv->type->nextOf()->isBaseOf(type->nextOf(), &offset))
+			{
+			    ti = fdv->type;
+#if 0
+			    if (offset)
+				ti = fdv->type;
+			    else if (type->nextOf()->ty == Tclass)
+			    {   ClassDeclaration *cdn = ((TypeClass *)type->nextOf())->sym;
+				if (cdn && cdn->sizeok != 1)
+				    ti = fdv->type;
+			    }
+#endif
+			}
+		    }
+		    if (ti)
+		    {
+			if (tintro && !tintro->equals(ti))
+			{
+			    error("incompatible covariant types %s and %s", tintro->toChars(), ti->toChars());
+			}
+			tintro = ti;
+		    }
+		    goto L2;
+		}
+	    }
+	}
+	if (introducing && isOverride())
+	{
+	    error("does not override any function");
+	}
+L2: ;
+}
+else if (isOverride() && !parent->isTemplateInstance())
+	error("override only applies to class member functions");
+/* Do not allow template instances to add virtual functions
+* to a class.
+*/
+if (isVirtual())
+{
+	TemplateInstance *ti = parent->isTemplateInstance();
+	if (ti)
+	{
+	    // Take care of nested templates
+	    while (1)
+	    {
+		TemplateInstance *ti2 = ti->tempdecl->parent->isTemplateInstance();
+		if (!ti2)
+		    break;
+		ti = ti2;
+	    }
+	    // If it's a member template
+	    ClassDeclaration *cd = ti->tempdecl->isClassMember();
+	    if (cd)
+	    {
+		error("cannot use template to add virtual function to class '%s'", cd->toChars());
+	    }
+	}
+}
+if (isMain())
+{
+	// Check parameters to see if they are either () or (char[][] args)
+	switch (nparams)
+	{
+	    case 0:
+		break;
+	    case 1:
+	    {
+		Argument *arg0 = Argument::getNth(f->parameters, 0);
+		if (arg0->type->ty != Tarray ||
+		    arg0->type->nextOf()->ty != Tarray ||
+		    arg0->type->nextOf()->nextOf()->ty != Tchar ||
+		    arg0->storageClass & (STCout | STCref | STClazy))
+		    goto Lmainerr;
+		break;
+	    }
+	    default:
+		goto Lmainerr;
+	}
+	if (f->nextOf()->ty != Tint32 && f->nextOf()->ty != Tvoid)
+	    error("must return int or void, not %s", f->nextOf()->toChars());
+	if (f->varargs)
+	{
+	Lmainerr:
+	    error("parameters must be main() or main(char[][] args)");
+	}
+}
+if (ident == Id::assign && (sd || cd))
+{	// Disallow identity assignment operator.
+	// opAssign(...)
+	if (nparams == 0)
+	{   if (f->varargs == 1)
+		goto Lassignerr;
+	}
+	else
+	{
+	    Argument *arg0 = Argument::getNth(f->parameters, 0);
+	    Type *t0 = arg0->type->toBasetype();
+	    Type *tb = sd ? sd->type : cd->type;
+	    if (arg0->type->implicitConvTo(tb) ||
+		(sd && t0->ty == Tpointer && t0->nextOf()->implicitConvTo(tb))
+	       )
+	    {
+		if (nparams == 1)
+		    goto Lassignerr;
+		Argument *arg1 = Argument::getNth(f->parameters, 1);
+		if (arg1->defaultArg)
+		    goto Lassignerr;
+	    }
+	}
+}
+Ldone:
+/* Save scope for possible later use (if we need the
+* function internals)
+*/
+scope = new Scope(*sc);
+scope->setNoFree();
+return;
+Lassignerr:
+if (sd)
+{
+	sd->hasIdentityAssign = 1;	// don't need to generate it
+	goto Ldone;
+}
+error("identity assignment operator overload is illegal");
+}
+void FuncDeclaration::semantic2(Scope *sc)
+{
+}
+// Do the semantic analysis on the internals of the function.
+void FuncDeclaration::semantic3(Scope *sc)
+{   TypeFunction *f;
+AggregateDeclaration *ad;
+VarDeclaration *argptr = NULL;
+VarDeclaration *_arguments = NULL;
+if (!parent)
+{
+	if (global.errors)
+	    return;
+	//printf("FuncDeclaration::semantic3(%s '%s', sc = %p)\n", kind(), toChars(), sc);
+	assert(0);
+}
+//printf("FuncDeclaration::semantic3('%s.%s', sc = %p, loc = %s)\n", parent->toChars(), toChars(), sc, loc.toChars());
+//fflush(stdout);
+//{ static int x; if (++x == 2) *(char*)0=0; }
+//printf("\tlinkage = %d\n", sc->linkage);
+//printf(" sc->incontract = %d\n", sc->incontract);
+if (semanticRun)
+	return;
+semanticRun = 1;
+if (!type || type->ty != Tfunction)
+	return;
+f = (TypeFunction *)(type);
+// Check the 'throws' clause
+if (fthrows)
+{
+	for (int i = 0; i < fthrows->dim; i++)
+	{
+	    Type *t = (Type *)fthrows->data[i];
+	    t = t->semantic(loc, sc);
+	    if (!t->isClassHandle())
+		error("can only throw classes, not %s", t->toChars());
+	}
+}
+if (fbody || frequire)
+{
+	/* Symbol table into which we place parameters and nested functions,
+	 * solely to diagnose name collisions.
+	 */
+	localsymtab = new DsymbolTable();
+	// Establish function scope
+	ScopeDsymbol *ss = new ScopeDsymbol();
+	ss->parent = sc->scopesym;
+	Scope *sc2 = sc->push(ss);
+	sc2->func = this;
+	sc2->parent = this;
+	sc2->callSuper = 0;
+	sc2->sbreak = NULL;
+	sc2->scontinue = NULL;
+	sc2->sw = NULL;
+	sc2->fes = fes;
+	sc2->linkage = LINKd;
+	sc2->stc &= ~(STCauto | STCscope | STCstatic | STCabstract | STCdeprecated | STCconst | STCfinal | STCinvariant | STCtls);
+	sc2->protection = PROTpublic;
+	sc2->explicitProtection = 0;
+	sc2->structalign = 8;
+	sc2->incontract = 0;
+	sc2->tf = NULL;
+	sc2->tfOfTry = NULL;
+	sc2->noctor = 0;
+	// Declare 'this'
+	ad = isThis();
+	if (ad)
+	{   VarDeclaration *v;
+	    if (isFuncLiteralDeclaration() && isNested())
+	    {
+		error("literals cannot be class members");
+		return;
+	    }
+	    else
+	    {
+		assert(!isNested());	// can't be both member and nested
+		assert(ad->handle);
+		Type *thandle = ad->handle;
+		if (storage_class & STCconst || type->isConst())
+		{
+		    if (thandle->ty == Tclass)
+			thandle = thandle->constOf();
+		    else
+		    {	assert(thandle->ty == Tpointer);
+			thandle = thandle->nextOf()->constOf()->pointerTo();
+		    }
+		}
+		else if (storage_class & STCinvariant || type->isInvariant())
+		{
+		    if (thandle->ty == Tclass)
+			thandle = thandle->invariantOf();
+		    else
+		    {	assert(thandle->ty == Tpointer);
+			thandle = thandle->nextOf()->invariantOf()->pointerTo();
+		    }
+		}
+		v = new ThisDeclaration(thandle);
+		v->storage_class |= STCparameter;
+		v->semantic(sc2);
+		if (!sc2->insert(v))
+		    assert(0);
+		v->parent = this;
+		vthis = v;
+	    }
+	}
+	else if (isNested())
+	{
+	    /* The 'this' for a nested function is the link to the
+	     * enclosing function's stack frame.
+	     * Note that nested functions and member functions are disjoint.
+	     */
+	    VarDeclaration *v = new ThisDeclaration(Type::tvoid->pointerTo());
+	    v->storage_class |= STCparameter;
+	    v->semantic(sc2);
+	    if (!sc2->insert(v))
+		assert(0);
+	    v->parent = this;
+	    vthis = v;
+	}
+	// Declare hidden variable _arguments[] and _argptr
+	if (f->varargs == 1)
+	{   Type *t;
+	    if (f->linkage == LINKd)
+	    {	// Declare _arguments[]
+#if BREAKABI
+		v_arguments = new VarDeclaration(0, Type::typeinfotypelist->type, Id::_arguments_typeinfo, NULL);
+		v_arguments->storage_class = STCparameter;
+		v_arguments->semantic(sc2);
+		sc2->insert(v_arguments);
+		v_arguments->parent = this;
+		//t = Type::typeinfo->type->constOf()->arrayOf();
+		t = Type::typeinfo->type->arrayOf();
+		_arguments = new VarDeclaration(0, t, Id::_arguments, NULL);
+		_arguments->semantic(sc2);
+		sc2->insert(_arguments);
+		_arguments->parent = this;
+#else
+		t = Type::typeinfo->type->arrayOf();
+		v_arguments = new VarDeclaration(0, t, Id::_arguments, NULL);
+		v_arguments->storage_class = STCparameter | STCin;
+		v_arguments->semantic(sc2);
+		sc2->insert(v_arguments);
+		v_arguments->parent = this;
+#endif
+	    }
+	    if (f->linkage == LINKd || (parameters && parameters->dim))
+	    {	// Declare _argptr
+#if IN_GCC
+		t = d_gcc_builtin_va_list_d_type;
+#else
+		t = Type::tvoid->pointerTo();
+#endif
+		argptr = new VarDeclaration(0, t, Id::_argptr, NULL);
+		argptr->semantic(sc2);
+		sc2->insert(argptr);
+		argptr->parent = this;
+	    }
+	}
+	// Propagate storage class from tuple parameters to their element-parameters.
+	if (f->parameters)
+	{
+	    for (size_t i = 0; i < f->parameters->dim; i++)
+	    {	Argument *arg = (Argument *)f->parameters->data[i];
+		if (arg->type->ty == Ttuple)
+		{   TypeTuple *t = (TypeTuple *)arg->type;
+		    size_t dim = Argument::dim(t->arguments);
+		    for (size_t j = 0; j < dim; j++)
+		    {	Argument *narg = Argument::getNth(t->arguments, j);
+			narg->storageClass = arg->storageClass;
+		    }
+		}
+	    }
+	}
+	/* Declare all the function parameters as variables
+	 * and install them in parameters[]
+	 */
+	size_t nparams = Argument::dim(f->parameters);
+	if (nparams)
+	{   /* parameters[] has all the tuples removed, as the back end
+	     * doesn't know about tuples
+	     */
+	    parameters = new Dsymbols();
+	    parameters->reserve(nparams);
+	    for (size_t i = 0; i < nparams; i++)
+	    {
+		Argument *arg = Argument::getNth(f->parameters, i);
+		Identifier *id = arg->ident;
+		if (!id)
+		{
+		    /* Generate identifier for un-named parameter,
+		     * because we need it later on.
+		     */
+		    arg->ident = id = Identifier::generateId("_param_", i);
+		}
+		VarDeclaration *v = new VarDeclaration(loc, arg->type, id, NULL);
+		//printf("declaring parameter %s of type %s\n", v->toChars(), v->type->toChars());
+		v->storage_class |= STCparameter;
+		if (f->varargs == 2 && i + 1 == nparams)
+		    v->storage_class |= STCvariadic;
+		v->storage_class |= arg->storageClass & (STCin | STCout | STCref | STClazy | STCfinal | STCconst | STCinvariant | STCnodtor);
+		v->semantic(sc2);
+		if (!sc2->insert(v))
+		    error("parameter %s.%s is already defined", toChars(), v->toChars());
+		else
+		    parameters->push(v);
+		localsymtab->insert(v);
+		v->parent = this;
+	    }
+	}
+	// Declare the tuple symbols and put them in the symbol table,
+	// but not in parameters[].
+	if (f->parameters)
+	{
+	    for (size_t i = 0; i < f->parameters->dim; i++)
+	    {	Argument *arg = (Argument *)f->parameters->data[i];
+		if (!arg->ident)
+		    continue;			// never used, so ignore
+		if (arg->type->ty == Ttuple)
+		{   TypeTuple *t = (TypeTuple *)arg->type;
+		    size_t dim = Argument::dim(t->arguments);
+		    Objects *exps = new Objects();
+		    exps->setDim(dim);
+		    for (size_t j = 0; j < dim; j++)
+		    {	Argument *narg = Argument::getNth(t->arguments, j);
+			assert(narg->ident);
+			VarDeclaration *v = sc2->search(0, narg->ident, NULL)->isVarDeclaration();
+			assert(v);
+			Expression *e = new VarExp(v->loc, v);
+			exps->data[j] = (void *)e;
+		    }
+		    assert(arg->ident);
+		    TupleDeclaration *v = new TupleDeclaration(loc, arg->ident, exps);
+		    //printf("declaring tuple %s\n", v->toChars());
+		    v->isexp = 1;
+		    if (!sc2->insert(v))
+			error("parameter %s.%s is already defined", toChars(), v->toChars());
+		    localsymtab->insert(v);
+		    v->parent = this;
+		}
+	    }
+	}
+	/* Do the semantic analysis on the [in] preconditions and
+	 * [out] postconditions.
+	 */
+	sc2->incontract++;
+	if (frequire)
+	{   /* frequire is composed of the [in] contracts
+	     */
+	    // BUG: need to error if accessing out parameters
+	    // BUG: need to treat parameters as const
+	    // BUG: need to disallow returns and throws
+	    // BUG: verify that all in and ref parameters are read
+	    frequire = frequire->semantic(sc2);
+	    labtab = NULL;		// so body can't refer to labels
+	}
+	if (fensure || addPostInvariant())
+	{   /* fensure is composed of the [out] contracts
+	     */
+	    ScopeDsymbol *sym = new ScopeDsymbol();
+	    sym->parent = sc2->scopesym;
+	    sc2 = sc2->push(sym);
+	    assert(type->nextOf());
+	    if (type->nextOf()->ty == Tvoid)
+	    {
+		if (outId)
+		    error("void functions have no result");
+	    }
+	    else
+	    {
+		if (!outId)
+		    outId = Id::result;		// provide a default
+	    }
+	    if (outId)
+	    {	// Declare result variable
+		VarDeclaration *v;
+		Loc loc = this->loc;
+		if (fensure)
+		    loc = fensure->loc;
+		v = new VarDeclaration(loc, type->nextOf(), outId, NULL);
+		v->noauto = 1;
+		sc2->incontract--;
+		v->semantic(sc2);
+		sc2->incontract++;
+		if (!sc2->insert(v))
+		    error("out result %s is already defined", v->toChars());
+		v->parent = this;
+		vresult = v;
+		// vresult gets initialized with the function return value
+		// in ReturnStatement::semantic()
+	    }
+	    // BUG: need to treat parameters as const
+	    // BUG: need to disallow returns and throws
+	    if (fensure)
+	    {	fensure = fensure->semantic(sc2);
+		labtab = NULL;		// so body can't refer to labels
+	    }
+	    if (!global.params.useOut)
+	    {	fensure = NULL;		// discard
+		vresult = NULL;
+	    }
+	    // Postcondition invariant
+	    if (addPostInvariant())
+	    {
+		Expression *e = NULL;
+		if (isCtorDeclaration())
+		{
+		    // Call invariant directly only if it exists
+		    InvariantDeclaration *inv = ad->inv;
+		    ClassDeclaration *cd = ad->isClassDeclaration();
+		    while (!inv && cd)
+		    {
+			cd = cd->baseClass;
+			if (!cd)
+			    break;
+			inv = cd->inv;
+		    }
+		    if (inv)
+		    {
+			e = new DsymbolExp(0, inv);
+			e = new CallExp(0, e);
+			e = e->semantic(sc2);
+		    }
+		}
+		else
+		{   // Call invariant virtually
+		    ThisExp *v = new ThisExp(0);
+		    v->type = vthis->type;
+		    e = new AssertExp(0, v);
+		}
+		if (e)
+		{
+		    ExpStatement *s = new ExpStatement(0, e);
+		    if (fensure)
+			fensure = new CompoundStatement(0, s, fensure);
+		    else
+			fensure = s;
+		}
+	    }
+	    if (fensure)
+	    {	returnLabel = new LabelDsymbol(Id::returnLabel);
+		LabelStatement *ls = new LabelStatement(0, Id::returnLabel, fensure);
+		ls->isReturnLabel = 1;
+		returnLabel->statement = ls;
+	    }
+	    sc2 = sc2->pop();
+	}
+	sc2->incontract--;
+	if (fbody)
+	{   ClassDeclaration *cd = isClassMember();
+	    /* If this is a class constructor
+	     */
+	    if (isCtorDeclaration() && cd)
+	    {
+		for (int i = 0; i < cd->fields.dim; i++)
+		{   VarDeclaration *v = (VarDeclaration *)cd->fields.data[i];
+		    v->ctorinit = 0;
+		}
+	    }
+	    if (inferRetType || f->retStyle() != RETstack)
+		nrvo_can = 0;
+	    fbody = fbody->semantic(sc2);
+	    if (inferRetType)
+	    {	// If no return type inferred yet, then infer a void
+		if (!type->nextOf())
+		{
+		    ((TypeFunction *)type)->next = Type::tvoid;
+		    type = type->semantic(loc, sc);
+		}
+		f = (TypeFunction *)type;
+	    }
+	    if (isStaticCtorDeclaration())
+	    {	/* It's a static constructor. Ensure that all
+		 * ctor consts were initialized.
+		 */
+		Dsymbol *p = toParent();
+		ScopeDsymbol *ad = p->isScopeDsymbol();
+		if (!ad)
+		{
+		    error("static constructor can only be member of struct/class/module, not %s %s", p->kind(), p->toChars());
+		}
+		else
+		{
+		    for (int i = 0; i < ad->members->dim; i++)
+		    {   Dsymbol *s = (Dsymbol *)ad->members->data[i];
+			s->checkCtorConstInit();
+		    }
+		}
+	    }
+	    if (isCtorDeclaration() && cd)
+	    {
+		//printf("callSuper = x%x\n", sc2->callSuper);
+		// Verify that all the ctorinit fields got initialized
+		if (!(sc2->callSuper & CSXthis_ctor))
+		{
+		    for (int i = 0; i < cd->fields.dim; i++)
+		    {   VarDeclaration *v = (VarDeclaration *)cd->fields.data[i];
+			if (v->ctorinit == 0 && v->isCtorinit())
+			    error("missing initializer for final field %s", v->toChars());
+		    }
+		}
+		if (!(sc2->callSuper & CSXany_ctor) &&
+		    cd->baseClass && cd->baseClass->ctor)
+		{
+		    sc2->callSuper = 0;
+		    // Insert implicit super() at start of fbody
+		    Expression *e1 = new SuperExp(0);
+		    Expression *e = new CallExp(0, e1);
+		    unsigned errors = global.errors;
+		    global.gag++;
+		    e = e->semantic(sc2);
+		    global.gag--;
+		    if (errors != global.errors)
+			error("no match for implicit super() call in constructor");
+		    Statement *s = new ExpStatement(0, e);
+		    fbody = new CompoundStatement(0, s, fbody);
+		}
+	    }
+	    else if (fes)
+	    {	// For foreach(){} body, append a return 0;
+		Expression *e = new IntegerExp(0);
+		Statement *s = new ReturnStatement(0, e);
+		fbody = new CompoundStatement(0, fbody, s);
+		assert(!returnLabel);
+	    }
+	    else if (!hasReturnExp && type->nextOf()->ty != Tvoid)
+		error("expected to return a value of type %s", type->nextOf()->toChars());
+	    else if (!inlineAsm)
+	    {
+		int offend = fbody ? fbody->blockExit() & BEfallthru : TRUE;
+		//int offend = fbody ? fbody->fallOffEnd() : TRUE;
+		if (type->nextOf()->ty == Tvoid)
+		{
+		    if (offend && isMain())
+		    {	// Add a return 0; statement
+			Statement *s = new ReturnStatement(0, new IntegerExp(0));
+			fbody = new CompoundStatement(0, fbody, s);
+		    }
+		}
+		else
+		{
+		    if (offend)
+		    {   Expression *e;
+			if (global.params.warnings)
+			{   warning("%s: no return at end of function", locToChars());
+			}
+			if (global.params.useAssert &&
+			    !global.params.useInline)
+			{   /* Add an assert(0, msg); where the missing return
+			     * should be.
+			     */
+			    e = new AssertExp(
+				  endloc,
+				  new IntegerExp(0),
+				  new StringExp(loc, (char *)"missing return expression")
+				);
+			}
+			else
+			    e = new HaltExp(endloc);
+			e = new CommaExp(0, e, type->nextOf()->defaultInit());
+			e = e->semantic(sc2);
+			Statement *s = new ExpStatement(0, e);
+			fbody = new CompoundStatement(0, fbody, s);
+		    }
+		}
+	    }
+	}
+	{
+	    Statements *a = new Statements();
+	    // Merge in initialization of 'out' parameters
+	    if (parameters)
+	    {	for (size_t i = 0; i < parameters->dim; i++)
+		{
+		    VarDeclaration *v = (VarDeclaration *)parameters->data[i];
+		    if (v->storage_class & STCout)
+		    {
+			assert(v->init);
+			ExpInitializer *ie = v->init->isExpInitializer();
+			assert(ie);
+			a->push(new ExpStatement(0, ie->exp));
+		    }
+		}
+	    }
+// we'll handle variadics ourselves
+#if !IN_LLVM
+	    if (argptr)
+	    {	// Initialize _argptr to point past non-variadic arg
+#if IN_GCC
+		// Handled in FuncDeclaration::toObjFile
+		v_argptr = argptr;
+		v_argptr->init = new VoidInitializer(loc);
+#else
+		Expression *e1;
+		Expression *e;
+		Type *t = argptr->type;
+		VarDeclaration *p;
+		unsigned offset;
+		e1 = new VarExp(0, argptr);
+		if (parameters && parameters->dim)
+		    p = (VarDeclaration *)parameters->data[parameters->dim - 1];
+		else
+		    p = v_arguments;		// last parameter is _arguments[]
+		offset = p->type->size();
+		offset = (offset + 3) & ~3;	// assume stack aligns on 4
+		e = new SymOffExp(0, p, offset);
+		e = new AssignExp(0, e1, e);
+		e->type = t;
+		a->push(new ExpStatement(0, e));
+#endif // IN_GCC
+	    }
+	    if (_arguments)
+	    {
+		/* Advance to elements[] member of TypeInfo_Tuple with:
+		 *  _arguments = v_arguments.elements;
+		 */
+		Expression *e = new VarExp(0, v_arguments);
+		e = new DotIdExp(0, e, Id::elements);
+		Expression *e1 = new VarExp(0, _arguments);
+		e = new AssignExp(0, e1, e);
+		e->op = TOKconstruct;
+		e = e->semantic(sc);
+		a->push(new ExpStatement(0, e));
+	    }
+#endif // !IN_LLVM
+	    // Merge contracts together with body into one compound statement
+#ifdef _DH
+	    if (frequire && global.params.useIn)
+	    {	frequire->incontract = 1;
+		a->push(frequire);
+	    }
+#else
+	    if (frequire && global.params.useIn)
+		a->push(frequire);
+#endif
+	    // Precondition invariant
+	    if (addPreInvariant())
+	    {
+		Expression *e = NULL;
+		if (isDtorDeclaration())
+		{
+		    // Call invariant directly only if it exists
+		    InvariantDeclaration *inv = ad->inv;
+		    ClassDeclaration *cd = ad->isClassDeclaration();
+		    while (!inv && cd)
+		    {
+			cd = cd->baseClass;
+			if (!cd)
+			    break;
+			inv = cd->inv;
+		    }
+		    if (inv)
+		    {
+			e = new DsymbolExp(0, inv);
+			e = new CallExp(0, e);
+			e = e->semantic(sc2);
+		    }
+		}
+		else
+		{   // Call invariant virtually
+		    ThisExp *v = new ThisExp(0);
+		    v->type = vthis->type;
+		    Expression *se = new StringExp(0, (char *)"null this");
+		    se = se->semantic(sc);
+		    se->type = Type::tchar->arrayOf();
+		    e = new AssertExp(loc, v, se);
+		}
+		if (e)
+		{
+		    ExpStatement *s = new ExpStatement(0, e);
+		    a->push(s);
+		}
+	    }
+	    if (fbody)
+		a->push(fbody);
+	    if (fensure)
+	    {
+		a->push(returnLabel->statement);
+		if (type->nextOf()->ty != Tvoid)
+		{
+		    // Create: return vresult;
+		    assert(vresult);
+		    Expression *e = new VarExp(0, vresult);
+		    if (tintro)
+		    {	e = e->implicitCastTo(sc, tintro->nextOf());
+			e = e->semantic(sc);
+		    }
+		    ReturnStatement *s = new ReturnStatement(0, e);
+		    a->push(s);
+		}
+	    }
+	    fbody = new CompoundStatement(0, a);
+	    /* Append destructor calls for parameters as finally blocks.
+	     */
+	    if (parameters)
+	    {	for (size_t i = 0; i < parameters->dim; i++)
+		{
+		    VarDeclaration *v = (VarDeclaration *)parameters->data[i];
+		    if (v->storage_class & (STCref | STCout))
+			continue;
+		    /* Don't do this for static arrays, since static
+		     * arrays are called by reference. Remove this
+		     * when we change them to call by value.
+		     */
+		    if (v->type->toBasetype()->ty == Tsarray)
+			continue;
+		    Expression *e = v->callAutoDtor(sc);
+		    if (e)
+		    {	Statement *s = new ExpStatement(0, e);
+			s = s->semantic(sc);
+			if (fbody->blockExit() == BEfallthru)
+			    fbody = new CompoundStatement(0, fbody, s);
+			else
+			    fbody = new TryFinallyStatement(0, fbody, s);
+		    }
+		}
+	    }
+	}
+	sc2->callSuper = 0;
+	sc2->pop();
+}
+semanticRun = 2;
+}
+void FuncDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+//printf("FuncDeclaration::toCBuffer() '%s'\n", toChars());
+type->toCBuffer(buf, ident, hgs);
+bodyToCBuffer(buf, hgs);
+}
+void FuncDeclaration::bodyToCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (fbody &&
+	(!hgs->hdrgen || hgs->tpltMember || canInline(1,1))
+)
+{	buf->writenl();
+	// in{}
+	if (frequire)
+	{   buf->writestring("in");
+	    buf->writenl();
+	    frequire->toCBuffer(buf, hgs);
+	}
+	// out{}
+	if (fensure)
+	{   buf->writestring("out");
+	    if (outId)
+	    {   buf->writebyte('(');
+		buf->writestring(outId->toChars());
+		buf->writebyte(')');
+	    }
+	    buf->writenl();
+	    fensure->toCBuffer(buf, hgs);
+	}
+if (frequire || fensure)
+	{   buf->writestring("body");
+	    buf->writenl();
+	}
+	buf->writebyte('{');
+	buf->writenl();
+	fbody->toCBuffer(buf, hgs);
+	buf->writebyte('}');
+	buf->writenl();
+}
+else
+{	buf->writeByte(';');
+	buf->writenl();
+}
+}
+/****************************************************
+* Determine if 'this' overrides fd.
+* Return !=0 if it does.
+*/
+int FuncDeclaration::overrides(FuncDeclaration *fd)
+{   int result = 0;
+if (fd->ident == ident)
+{
+	int cov = type->covariant(fd->type);
+	if (cov)
+	{   ClassDeclaration *cd1 = toParent()->isClassDeclaration();
+	    ClassDeclaration *cd2 = fd->toParent()->isClassDeclaration();
+	    if (cd1 && cd2 && cd2->isBaseOf(cd1, NULL))
+		result = 1;
+	}
+}
+return result;
+}
+/*************************************************
+* Find index of function in vtbl[0..dim] that
+* this function overrides.
+* Returns:
+*	-1	didn't find one
+*	-2	can't determine because of forward references
+*/
+int FuncDeclaration::findVtblIndex(Array *vtbl, int dim)
+{
+for (int vi = 0; vi < dim; vi++)
+{
+	FuncDeclaration *fdv = ((Dsymbol *)vtbl->data[vi])->isFuncDeclaration();
+	if (fdv && fdv->ident == ident)
+	{
+	    int cov = type->covariant(fdv->type);
+	    //printf("\tbaseclass cov = %d\n", cov);
+	    switch (cov)
+	    {
+		case 0:		// types are distinct
+		    break;
+		case 1:
+		    return vi;
+		case 2:
+		    //type->print();
+		    //fdv->type->print();
+		    //printf("%s %s\n", type->deco, fdv->type->deco);
+		    error("of type %s overrides but is not covariant with %s of type %s",
+			type->toChars(), fdv->toPrettyChars(), fdv->type->toChars());
+		    break;
+		case 3:
+		    return -2;	// forward references
+		default:
+		    assert(0);
+	    }
+	}
+}
+return -1;
+}
+/****************************************************
+* Overload this FuncDeclaration with the new one f.
+* Return !=0 if successful; i.e. no conflict.
+*/
+int FuncDeclaration::overloadInsert(Dsymbol *s)
+{
+FuncDeclaration *f;
+AliasDeclaration *a;
+//printf("FuncDeclaration::overloadInsert(%s)\n", s->toChars());
+a = s->isAliasDeclaration();
+if (a)
+{
+	if (overnext)
+	    return overnext->overloadInsert(a);
+	if (!a->aliassym && a->type->ty != Tident && a->type->ty != Tinstance)
+	{
+	    //printf("\ta = '%s'\n", a->type->toChars());
+	    return FALSE;
+	}
+	overnext = a;
+	//printf("\ttrue: no conflict\n");
+	return TRUE;
+}
+f = s->isFuncDeclaration();
+if (!f)
+	return FALSE;
+#if 0
+/* Disable this check because:
+*	const void foo();
+* semantic() isn't run yet on foo(), so the const hasn't been
+* applied yet.
+*/
+if (type)
+{   printf("type = %s\n", type->toChars());
+	printf("f->type = %s\n", f->type->toChars());
+}
+if (type && f->type &&	// can be NULL for overloaded constructors
+	f->type->covariant(type) &&
+	f->type->mod == type->mod &&
+	!isFuncAliasDeclaration())
+{
+	//printf("\tfalse: conflict %s\n", kind());
+	return FALSE;
+}
+#endif
+if (overnext)
+	return overnext->overloadInsert(f);
+overnext = f;
+//printf("\ttrue: no conflict\n");
+return TRUE;
+}
+/********************************************
+* Find function in overload list that exactly matches t.
+*/
+/***************************************************
+* Visit each overloaded function in turn, and call
+* (*fp)(param, f) on it.
+* Exit when no more, or (*fp)(param, f) returns 1.
+* Returns:
+*	0	continue
+*	1	done
+*/
+int overloadApply(FuncDeclaration *fstart,
+	int (*fp)(void *, FuncDeclaration *),
+	void *param)
+{
+FuncDeclaration *f;
+Declaration *d;
+Declaration *next;
+for (d = fstart; d; d = next)
+{	FuncAliasDeclaration *fa = d->isFuncAliasDeclaration();
+	if (fa)
+	{
+	    if (overloadApply(fa->funcalias, fp, param))
+		return 1;
+	    next = fa->overnext;
+	}
+	else
+	{
+	    AliasDeclaration *a = d->isAliasDeclaration();
+	    if (a)
+	    {
+		Dsymbol *s = a->toAlias();
+		next = s->isDeclaration();
+		if (next == a)
+		    break;
+		if (next == fstart)
+		    break;
+	    }
+	    else
+	    {
+		f = d->isFuncDeclaration();
+		if (!f)
+		{   d->error("is aliased to a function");
+		    break;		// BUG: should print error message?
+		}
+		if ((*fp)(param, f))
+		    return 1;
+		next = f->overnext;
+	    }
+	}
+}
+return 0;
+}
+/********************************************
+* If there are no overloads of function f, return that function,
+* otherwise return NULL.
+*/
+static int fpunique(void *param, FuncDeclaration *f)
+{   FuncDeclaration **pf = (FuncDeclaration **)param;
+if (*pf)
+{	*pf = NULL;
+	return 1;		// ambiguous, done
+}
+else
+{	*pf = f;
+	return 0;
+}
+}
+FuncDeclaration *FuncDeclaration::isUnique()
+{   FuncDeclaration *result = NULL;
+overloadApply(this, &fpunique, &result);
+return result;
+}
+/********************************************
+* Find function in overload list that exactly matches t.
+*/
+struct Param1
+{
+Type *t;		// type to match
+FuncDeclaration *f;	// return value
+};
+int fp1(void *param, FuncDeclaration *f)
+{   Param1 *p = (Param1 *)param;
+Type *t = p->t;
+if (t->equals(f->type))
+{	p->f = f;
+	return 1;
+}
+#if DMDV2
+/* Allow covariant matches, if it's just a const conversion
+* of the return type
+*/
+if (t->ty == Tfunction)
+{   TypeFunction *tf = (TypeFunction *)f->type;
+	if (tf->covariant(t) == 1 &&
+	    tf->nextOf()->implicitConvTo(t->nextOf()) >= MATCHconst)
+	{
+	    p->f = f;
+	    return 1;
+	}
+}
+#endif
+return 0;
+}
+FuncDeclaration *FuncDeclaration::overloadExactMatch(Type *t)
+{
+Param1 p;
+p.t = t;
+p.f = NULL;
+overloadApply(this, &fp1, &p);
+return p.f;
+}
+/********************************************
+* Decide which function matches the arguments best.
+*/
+struct Param2
+{
+Match *m;
+Expression *ethis;
+Expressions *arguments;
+};
+int fp2(void *param, FuncDeclaration *f)
+{   Param2 *p = (Param2 *)param;
+Match *m = p->m;
+Expressions *arguments = p->arguments;
+MATCH match;
+if (f != m->lastf)		// skip duplicates
+{
+	m->anyf = f;
+	TypeFunction *tf = (TypeFunction *)f->type;
+	match = (MATCH) tf->callMatch(f->needThis() ? p->ethis : NULL, arguments);
+	//printf("match = %d\n", match);
+	if (match != MATCHnomatch)
+	{
+	    if (match > m->last)
+		goto LfIsBetter;
+	    if (match < m->last)
+		goto LlastIsBetter;
+	    /* See if one of the matches overrides the other.
+	     */
+	    if (m->lastf->overrides(f))
+		goto LlastIsBetter;
+	    else if (f->overrides(m->lastf))
+		goto LfIsBetter;
+	    /* Try to disambiguate using template-style partial ordering rules.
+	     * In essence, if f() and g() are ambiguous, if f() can call g(),
+	     * but g() cannot call f(), then pick f().
+	     * This is because f() is "more specialized."
+	     */
+	    {
+	    MATCH c1 = f->leastAsSpecialized(m->lastf);
+	    MATCH c2 = m->lastf->leastAsSpecialized(f);
+	    //printf("c1 = %d, c2 = %d\n", c1, c2);
+	    if (c1 > c2)
+		goto LfIsBetter;
+	    if (c1 < c2)
+		goto LlastIsBetter;
+	    }
+	Lambiguous:
+	    m->nextf = f;
+	    m->count++;
+	    return 0;
+	LfIsBetter:
+	    m->last = match;
+	    m->lastf = f;
+	    m->count = 1;
+	    return 0;
+	LlastIsBetter:
+	    return 0;
+	}
+}
+return 0;
+}
+void overloadResolveX(Match *m, FuncDeclaration *fstart,
+	Expression *ethis, Expressions *arguments)
+{
+Param2 p;
+p.m = m;
+p.ethis = ethis;
+p.arguments = arguments;
+overloadApply(fstart, &fp2, &p);
+}
+FuncDeclaration *FuncDeclaration::overloadResolve(Loc loc, Expression *ethis, Expressions *arguments, int flags)
+{
+TypeFunction *tf;
+Match m;
+#if 0
+printf("FuncDeclaration::overloadResolve('%s')\n", toChars());
+if (arguments)
+{   int i;
+for (i = 0; i < arguments->dim; i++)
+{   Expression *arg;
+	arg = (Expression *)arguments->data[i];
+	assert(arg->type);
+	printf("\t%s: ", arg->toChars());
+	arg->type->print();
+}
+}
+#endif
+memset(&m, 0, sizeof(m));
+m.last = MATCHnomatch;
+overloadResolveX(&m, this, ethis, arguments);
+if (m.count == 1)		// exactly one match
+{
+	return m.lastf;
+}
+else
+{
+	OutBuffer buf;
+	if (arguments)
+	{
+	    HdrGenState hgs;
+	    argExpTypesToCBuffer(&buf, arguments, &hgs);
+	}
+	if (m.last == MATCHnomatch)
+	{
+	    if (flags & 1)		// if do not print error messages
+		return NULL;		// no match
+	    tf = (TypeFunction *)type;
+	    //printf("tf = %s, args = %s\n", tf->deco, ((Expression *)arguments->data[0])->type->deco);
+	    error(loc, "%s does not match parameter types (%s)",
+		Argument::argsTypesToChars(tf->parameters, tf->varargs),
+		buf.toChars());
+	    return m.anyf;		// as long as it's not a FuncAliasDeclaration
+	}
+	else
+	{
+#if 1
+	    TypeFunction *t1 = (TypeFunction *)m.lastf->type;
+	    TypeFunction *t2 = (TypeFunction *)m.nextf->type;
+	    error(loc, "called with argument types:\n\t(%s)\nmatches both:\n\t%s%s\nand:\n\t%s%s",
+		    buf.toChars(),
+		    m.lastf->toPrettyChars(), Argument::argsTypesToChars(t1->parameters, t1->varargs),
+		    m.nextf->toPrettyChars(), Argument::argsTypesToChars(t2->parameters, t2->varargs));
+#else
+	    error(loc, "overloads %s and %s both match argument list for %s",
+		    m.lastf->type->toChars(),
+		    m.nextf->type->toChars(),
+		    m.lastf->toChars());
+#endif
+	    return m.lastf;
+	}
+}
+}
+/*************************************
+* Determine partial specialization order of 'this' vs g.
+* This is very similar to TemplateDeclaration::leastAsSpecialized().
+* Returns:
+*	match	'this' is at least as specialized as g
+*	0	g is more specialized than 'this'
+*/
+MATCH FuncDeclaration::leastAsSpecialized(FuncDeclaration *g)
+{
+#define LOG_LEASTAS     0
+#if LOG_LEASTAS
+printf("%s.leastAsSpecialized(%s)\n", toChars(), g->toChars());
+#endif
+/* This works by calling g() with f()'s parameters, and
+* if that is possible, then f() is at least as specialized
+* as g() is.
+*/
+TypeFunction *tf = (TypeFunction *)type;
+TypeFunction *tg = (TypeFunction *)g->type;
+size_t nfparams = Argument::dim(tf->parameters);
+size_t ngparams = Argument::dim(tg->parameters);
+MATCH match = MATCHexact;
+/* If both functions have a 'this' pointer, and the mods are not
+* the same and g's is not const, then this is less specialized.
+*/
+if (needThis() && g->needThis())
+{
+	if (tf->mod != tg->mod)
+	{
+	    if (tg->mod == MODconst)
+		match = MATCHconst;
+	    else
+		return MATCHnomatch;
+	}
+}
+/* Create a dummy array of arguments out of the parameters to f()
+*/
+Expressions args;
+args.setDim(nfparams);
+for (int u = 0; u < nfparams; u++)
+{
+	Argument *p = Argument::getNth(tf->parameters, u);
+	Expression *e;
+	if (p->storageClass & (STCref | STCout))
+	{
+	    e = new IdentifierExp(0, p->ident);
+	    e->type = p->type;
+	}
+	else
+	    e = p->type->defaultInit();
+	args.data[u] = e;
+}
+MATCH m = (MATCH) tg->callMatch(NULL, &args);
+if (m)
+{
+/* A variadic parameter list is less specialized than a
+* non-variadic one.
+*/
+if (tf->varargs && !tg->varargs)
+goto L1;	// less specialized
+#if LOG_LEASTAS
+printf("  matches %d, so is least as specialized\n", m);
+#endif
+return m;
+}
+L1:
+#if LOG_LEASTAS
+printf("  doesn't match, so is not as specialized\n");
+#endif
+return MATCHnomatch;
+}
+/********************************
+* Labels are in a separate scope, one per function.
+*/
+LabelDsymbol *FuncDeclaration::searchLabel(Identifier *ident)
+{   Dsymbol *s;
+if (!labtab)
+	labtab = new DsymbolTable();	// guess we need one
+s = labtab->lookup(ident);
+if (!s)
+{
+	s = new LabelDsymbol(ident);
+	labtab->insert(s);
+}
+return (LabelDsymbol *)s;
+}
+/****************************************
+* If non-static member function that has a 'this' pointer,
+* return the aggregate it is a member of.
+* Otherwise, return NULL.
+*/
+AggregateDeclaration *FuncDeclaration::isThis()
+{   AggregateDeclaration *ad;
+//printf("+FuncDeclaration::isThis() '%s'\n", toChars());
+ad = NULL;
+if ((storage_class & STCstatic) == 0)
+{
+	ad = isMember2();
+}
+//printf("-FuncDeclaration::isThis() %p\n", ad);
+return ad;
+}
+AggregateDeclaration *FuncDeclaration::isMember2()
+{   AggregateDeclaration *ad;
+//printf("+FuncDeclaration::isMember2() '%s'\n", toChars());
+ad = NULL;
+for (Dsymbol *s = this; s; s = s->parent)
+{
+//printf("\ts = '%s', parent = '%s', kind = %s\n", s->toChars(), s->parent->toChars(), s->parent->kind());
+	ad = s->isMember();
+	if (ad)
+{   //printf("test4\n");
+	    break;
+}
+	if (!s->parent ||
+	    (!s->parent->isTemplateInstance()))
+{   //printf("test5\n");
+	    break;
+}
+}
+//printf("-FuncDeclaration::isMember2() %p\n", ad);
+return ad;
+}
+/*****************************************
+* Determine lexical level difference from 'this' to nested function 'fd'.
+* Error if this cannot call fd.
+* Returns:
+*	0	same level
+*	-1	increase nesting by 1 (fd is nested within 'this')
+*	>0	decrease nesting by number
+*/
+int FuncDeclaration::getLevel(Loc loc, FuncDeclaration *fd)
+{   int level;
+Dsymbol *s;
+Dsymbol *fdparent;
+//printf("FuncDeclaration::getLevel(fd = '%s')\n", fd->toChars());
+fdparent = fd->toParent2();
+if (fdparent == this)
+	return -1;
+s = this;
+level = 0;
+while (fd != s && fdparent != s->toParent2())
+{
+	//printf("\ts = '%s'\n", s->toChars());
+	FuncDeclaration *thisfd = s->isFuncDeclaration();
+	if (thisfd)
+	{   if (!thisfd->isNested() && !thisfd->vthis)
+		goto Lerr;
+	}
+	else
+	{
+	    ClassDeclaration *thiscd = s->isClassDeclaration();
+	    if (thiscd)
+	    {	if (!thiscd->isNested())
+		    goto Lerr;
+	    }
+	    else
+		goto Lerr;
+	}
+	s = s->toParent2();
+	assert(s);
+	level++;
+}
+return level;
+Lerr:
+error(loc, "cannot access frame of function %s", fd->toChars());
+return 1;
+}
+void FuncDeclaration::appendExp(Expression *e)
+{   Statement *s;
+s = new ExpStatement(0, e);
+appendState(s);
+}
+void FuncDeclaration::appendState(Statement *s)
+{   CompoundStatement *cs;
+if (!fbody)
+{	Statements *a;
+	a = new Statements();
+	fbody = new CompoundStatement(0, a);
+}
+cs = fbody->isCompoundStatement();
+cs->statements->push(s);
+}
+int FuncDeclaration::isMain()
+{
+return ident == Id::main &&
+	linkage != LINKc && !isMember() && !isNested();
+}
+int FuncDeclaration::isWinMain()
+{
+//printf("FuncDeclaration::isWinMain() %s\n", toChars());
+#if 0
+int x = ident == Id::WinMain &&
+	linkage != LINKc && !isMember();
+printf("%s\n", x ? "yes" : "no");
+return x;
+#else
+return ident == Id::WinMain &&
+	linkage != LINKc && !isMember();
+#endif
+}
+int FuncDeclaration::isDllMain()
+{
+return ident == Id::DllMain &&
+	linkage != LINKc && !isMember();
+}
+int FuncDeclaration::isExport()
+{
+return protection == PROTexport;
+}
+int FuncDeclaration::isImportedSymbol()
+{
+//printf("isImportedSymbol()\n");
+//printf("protection = %d\n", protection);
+return (protection == PROTexport) && !fbody;
+}
+// Determine if function goes into virtual function pointer table
+int FuncDeclaration::isVirtual()
+{
+#if 0
+printf("FuncDeclaration::isVirtual(%s)\n", toChars());
+printf("isMember:%p isStatic:%d private:%d ctor:%d !Dlinkage:%d\n", isMember(), isStatic(), protection == PROTprivate, isCtorDeclaration(), linkage != LINKd);
+printf("result is %d\n",
+	isMember() &&
+	!(isStatic() || protection == PROTprivate || protection == PROTpackage) &&
+	toParent()->isClassDeclaration());
+#endif
+return isMember() &&
+	!(isStatic() || protection == PROTprivate || protection == PROTpackage) &&
+	toParent()->isClassDeclaration();
+}
+int FuncDeclaration::isFinal()
+{
+#if 0
+printf("FuncDeclaration::isFinal(%s)\n", toChars());
+printf("%p %d %d %d %d\n", isMember(), isStatic(), protection == PROTprivate, isCtorDeclaration(), linkage != LINKd);
+printf("result is %d\n",
+	isMember() &&
+	!(isStatic() || protection == PROTprivate || protection == PROTpackage) &&
+	toParent()->isClassDeclaration());
+#endif
+ClassDeclaration *cd;
+return isMember() &&
+	(Declaration::isFinal() ||
+	 ((cd = toParent()->isClassDeclaration()) != NULL && cd->storage_class & STCfinal));
+}
+int FuncDeclaration::isAbstract()
+{
+return storage_class & STCabstract;
+}
+int FuncDeclaration::isCodeseg()
+{
+return TRUE;		// functions are always in the code segment
+}
+int FuncDeclaration::isOverloadable()
+{
+return 1;			// functions can be overloaded
+}
+// Determine if function needs
+// a static frame pointer to its lexically enclosing function
+int FuncDeclaration::isNested()
+{
+//if (!toParent())
+	//printf("FuncDeclaration::isNested('%s') parent=%p\n", toChars(), parent);
+//printf("\ttoParent2() = '%s'\n", toParent2()->toChars());
+return ((storage_class & STCstatic) == 0) &&
+	   (toParent2()->isFuncDeclaration() != NULL);
+}
+int FuncDeclaration::needThis()
+{
+//printf("FuncDeclaration::needThis() '%s'\n", toChars());
+int i = isThis() != NULL;
+//printf("\t%d\n", i);
+if (!i && isFuncAliasDeclaration())
+	i = ((FuncAliasDeclaration *)this)->funcalias->needThis();
+return i;
+}
+int FuncDeclaration::addPreInvariant()
+{
+AggregateDeclaration *ad = isThis();
+return (ad &&
+	    //ad->isClassDeclaration() &&
+	    global.params.useInvariants &&
+	    (protection == PROTpublic || protection == PROTexport) &&
+	    !naked &&
+	    ident != Id::cpctor);
+}
+int FuncDeclaration::addPostInvariant()
+{
+AggregateDeclaration *ad = isThis();
+return (ad &&
+	    ad->inv &&
+	    //ad->isClassDeclaration() &&
+	    global.params.useInvariants &&
+	    (protection == PROTpublic || protection == PROTexport) &&
+	    !naked &&
+	    ident != Id::cpctor);
+}
+/**********************************
+* Generate a FuncDeclaration for a runtime library function.
+*/
+//
+// LDC: Adjusted to give argument info to the runtime function decl.
+//
+FuncDeclaration *FuncDeclaration::genCfunc(Arguments *args, Type *treturn, const char *name)
+{
+return genCfunc(args, treturn, Lexer::idPool(name));
+}
+FuncDeclaration *FuncDeclaration::genCfunc(Arguments *args, Type *treturn, Identifier *id)
+{
+FuncDeclaration *fd;
+TypeFunction *tf;
+Dsymbol *s;
+static DsymbolTable *st = NULL;
+//printf("genCfunc(name = '%s')\n", id->toChars());
+//printf("treturn\n\t"); treturn->print();
+// See if already in table
+if (!st)
+	st = new DsymbolTable();
+s = st->lookup(id);
+if (s)
+{
+	fd = s->isFuncDeclaration();
+	assert(fd);
+	assert(fd->type->nextOf()->equals(treturn));
+}
+else
+{
+	tf = new TypeFunction(args, treturn, 0, LINKc);
+	fd = new FuncDeclaration(0, 0, id, STCstatic, tf);
+	fd->protection = PROTpublic;
+	fd->linkage = LINKc;
+	st->insert(fd);
+}
+return fd;
+}
+const char *FuncDeclaration::kind()
+{
+return "function";
+}
+/*******************************
+* Look at all the variables in this function that are referenced
+* by nested functions, and determine if a closure needs to be
+* created for them.
+*/
+#if DMDV2
+int FuncDeclaration::needsClosure()
+{
+/* Need a closure for all the closureVars[] if any of the
+* closureVars[] are accessed by a
+* function that escapes the scope of this function.
+* We take the conservative approach and decide that any function that:
+* 1) is a virtual function
+* 2) has its address taken
+* 3) has a parent that escapes
+*
+* Note that since a non-virtual function can be called by
+* a virtual one, if that non-virtual function accesses a closure
+* var, the closure still has to be taken. Hence, we check for isThis()
+* instead of isVirtual(). (thanks to David Friedman)
+*/
+//printf("FuncDeclaration::needsClosure() %s\n", toChars());
+for (int i = 0; i < closureVars.dim; i++)
+{	VarDeclaration *v = (VarDeclaration *)closureVars.data[i];
+	assert(v->isVarDeclaration());
+	//printf("\tv = %s\n", v->toChars());
+	for (int j = 0; j < v->nestedrefs.dim; j++)
+	{   FuncDeclaration *f = (FuncDeclaration *)v->nestedrefs.data[j];
+	    assert(f != this);
+	    //printf("\t\tf = %s, %d, %d\n", f->toChars(), f->isVirtual(), f->tookAddressOf);
+	    if (f->isThis() || f->tookAddressOf)
+		goto Lyes;	// assume f escapes this function's scope
+	    // Look to see if any parents of f that are below this escape
+	    for (Dsymbol *s = f->parent; s && s != this; s = s->parent)
+	    {
+		f = s->isFuncDeclaration();
+		if (f && (f->isThis() || f->tookAddressOf))
+		    goto Lyes;
+	    }
+	}
+}
+return 0;
+Lyes:
+//printf("\tneeds closure\n");
+return 1;
+}
+#endif
+/****************************** FuncAliasDeclaration ************************/
+// Used as a way to import a set of functions from another scope into this one.
+FuncAliasDeclaration::FuncAliasDeclaration(FuncDeclaration *funcalias)
+: FuncDeclaration(funcalias->loc, funcalias->endloc, funcalias->ident,
+	(enum STC)funcalias->storage_class, funcalias->type)
+{
+assert(funcalias != this);
+this->funcalias = funcalias;
+}
+const char *FuncAliasDeclaration::kind()
+{
+return "function alias";
+}
+/****************************** FuncLiteralDeclaration ************************/
+FuncLiteralDeclaration::FuncLiteralDeclaration(Loc loc, Loc endloc, Type *type,
+	enum TOK tok, ForeachStatement *fes)
+: FuncDeclaration(loc, endloc, NULL, STCundefined, type)
+{
+const char *id;
+if (fes)
+	id = "__foreachbody";
+else if (tok == TOKdelegate)
+	id = "__dgliteral";
+else
+	id = "__funcliteral";
+this->ident = Identifier::generateId(id);
+this->tok = tok;
+this->fes = fes;
+//printf("FuncLiteralDeclaration() id = '%s', type = '%s'\n", this->ident->toChars(), type->toChars());
+}
+Dsymbol *FuncLiteralDeclaration::syntaxCopy(Dsymbol *s)
+{
+FuncLiteralDeclaration *f;
+//printf("FuncLiteralDeclaration::syntaxCopy('%s')\n", toChars());
+if (s)
+	f = (FuncLiteralDeclaration *)s;
+else
+	f = new FuncLiteralDeclaration(loc, endloc, type->syntaxCopy(), tok, fes);
+FuncDeclaration::syntaxCopy(f);
+return f;
+}
+int FuncLiteralDeclaration::isNested()
+{
+//printf("FuncLiteralDeclaration::isNested() '%s'\n", toChars());
+return (tok == TOKdelegate);
+}
+int FuncLiteralDeclaration::isVirtual()
+{
+return FALSE;
+}
+const char *FuncLiteralDeclaration::kind()
+{
+// GCC requires the (char*) casts
+return (tok == TOKdelegate) ? (char*)"delegate" : (char*)"function";
+}
+void FuncLiteralDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+static Identifier *idfunc;
+static Identifier *iddel;
+if (!idfunc)
+	idfunc = new Identifier("function", 0);
+if (!iddel)
+	iddel = new Identifier("delegate", 0);
+type->toCBuffer(buf, ((tok == TOKdelegate) ? iddel : idfunc), hgs);
+bodyToCBuffer(buf, hgs);
+}
+/********************************* CtorDeclaration ****************************/
+CtorDeclaration::CtorDeclaration(Loc loc, Loc endloc, Arguments *arguments, int varargs)
+: FuncDeclaration(loc, endloc, Id::ctor, STCundefined, NULL)
+{
+this->arguments = arguments;
+this->varargs = varargs;
+//printf("CtorDeclaration(loc = %s) %s\n", loc.toChars(), toChars());
+}
+Dsymbol *CtorDeclaration::syntaxCopy(Dsymbol *s)
+{
+CtorDeclaration *f;
+f = new CtorDeclaration(loc, endloc, NULL, varargs);
+f->outId = outId;
+f->frequire = frequire ? frequire->syntaxCopy() : NULL;
+f->fensure  = fensure  ? fensure->syntaxCopy()  : NULL;
+f->fbody    = fbody    ? fbody->syntaxCopy()    : NULL;
+assert(!fthrows); // deprecated
+f->arguments = Argument::arraySyntaxCopy(arguments);
+return f;
+}
+void CtorDeclaration::semantic(Scope *sc)
+{
+AggregateDeclaration *ad;
+Type *tret;
+//printf("CtorDeclaration::semantic()\n");
+if (type)
+	return;
+sc = sc->push();
+sc->stc &= ~STCstatic;		// not a static constructor
+parent = sc->parent;
+Dsymbol *parent = toParent();
+ad = parent->isAggregateDeclaration();
+if (!ad || parent->isUnionDeclaration())
+{
+	error("constructors are only for class or struct definitions");
+	fatal();
+	tret = Type::tvoid;
+}
+else
+{	tret = ad->handle;
+	assert(tret);
+}
+type = new TypeFunction(arguments, tret, varargs, LINKd);
+if (!originalType)
+	originalType = type;
+sc->flags |= SCOPEctor;
+type = type->semantic(loc, sc);
+sc->flags &= ~SCOPEctor;
+// Append:
+//	return this;
+// to the function body
+if (fbody)
+{
+	Expression *e = new ThisExp(0);
+	Statement *s = new ReturnStatement(0, e);
+	fbody = new CompoundStatement(0, fbody, s);
+}
+FuncDeclaration::semantic(sc);
+sc->pop();
+// See if it's the default constructor
+if (ad && varargs == 0 && Argument::dim(arguments) == 0)
+{	if (ad->isStructDeclaration())
+	    error("default constructor not allowed for structs");
+	else
+	    ad->defaultCtor = this;
+}
+}
+const char *CtorDeclaration::kind()
+{
+return "constructor";
+}
+char *CtorDeclaration::toChars()
+{
+return (char *)"this";
+}
+int CtorDeclaration::isVirtual()
+{
+return FALSE;
+}
+int CtorDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int CtorDeclaration::addPostInvariant()
+{
+return (vthis && global.params.useInvariants);
+}
+void CtorDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+buf->writestring("this");
+Argument::argsToCBuffer(buf, hgs, arguments, varargs);
+bodyToCBuffer(buf, hgs);
+}
+/********************************* PostBlitDeclaration ****************************/
+PostBlitDeclaration::PostBlitDeclaration(Loc loc, Loc endloc)
+: FuncDeclaration(loc, endloc, Id::_postblit, STCundefined, NULL)
+{
+}
+PostBlitDeclaration::PostBlitDeclaration(Loc loc, Loc endloc, Identifier *id)
+: FuncDeclaration(loc, endloc, id, STCundefined, NULL)
+{
+}
+Dsymbol *PostBlitDeclaration::syntaxCopy(Dsymbol *s)
+{
+assert(!s);
+PostBlitDeclaration *dd = new PostBlitDeclaration(loc, endloc, ident);
+return FuncDeclaration::syntaxCopy(dd);
+}
+void PostBlitDeclaration::semantic(Scope *sc)
+{
+//printf("PostBlitDeclaration::semantic() %s\n", toChars());
+//printf("ident: %s, %s, %p, %p\n", ident->toChars(), Id::dtor->toChars(), ident, Id::dtor);
+parent = sc->parent;
+Dsymbol *parent = toParent();
+StructDeclaration *ad = parent->isStructDeclaration();
+if (!ad)
+{
+	error("post blits are only for struct/union definitions, not %s %s", parent->kind(), parent->toChars());
+}
+else if (ident == Id::_postblit)
+	ad->postblits.push(this);
+type = new TypeFunction(NULL, Type::tvoid, FALSE, LINKd);
+sc = sc->push();
+sc->stc &= ~STCstatic;		// not static
+sc->linkage = LINKd;
+FuncDeclaration::semantic(sc);
+sc->pop();
+}
+int PostBlitDeclaration::overloadInsert(Dsymbol *s)
+{
+return FALSE;	// cannot overload postblits
+}
+int PostBlitDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int PostBlitDeclaration::addPostInvariant()
+{
+return (vthis && global.params.useInvariants);
+}
+int PostBlitDeclaration::isVirtual()
+{
+return FALSE;
+}
+void PostBlitDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (hgs->hdrgen)
+	return;
+buf->writestring("=this()");
+bodyToCBuffer(buf, hgs);
+}
+/********************************* DtorDeclaration ****************************/
+DtorDeclaration::DtorDeclaration(Loc loc, Loc endloc)
+: FuncDeclaration(loc, endloc, Id::dtor, STCundefined, NULL)
+{
+}
+DtorDeclaration::DtorDeclaration(Loc loc, Loc endloc, Identifier *id)
+: FuncDeclaration(loc, endloc, id, STCundefined, NULL)
+{
+}
+Dsymbol *DtorDeclaration::syntaxCopy(Dsymbol *s)
+{
+assert(!s);
+DtorDeclaration *dd = new DtorDeclaration(loc, endloc, ident);
+return FuncDeclaration::syntaxCopy(dd);
+}
+void DtorDeclaration::semantic(Scope *sc)
+{
+//printf("DtorDeclaration::semantic() %s\n", toChars());
+//printf("ident: %s, %s, %p, %p\n", ident->toChars(), Id::dtor->toChars(), ident, Id::dtor);
+parent = sc->parent;
+Dsymbol *parent = toParent();
+AggregateDeclaration *ad = parent->isAggregateDeclaration();
+if (!ad)
+{
+	error("destructors are only for class/struct/union definitions, not %s %s", parent->kind(), parent->toChars());
+	fatal();
+}
+else if (ident == Id::dtor)
+	ad->dtors.push(this);
+type = new TypeFunction(NULL, Type::tvoid, FALSE, LINKd);
+sc = sc->push();
+sc->stc &= ~STCstatic;		// not a static destructor
+sc->linkage = LINKd;
+FuncDeclaration::semantic(sc);
+sc->pop();
+}
+int DtorDeclaration::overloadInsert(Dsymbol *s)
+{
+return FALSE;	// cannot overload destructors
+}
+int DtorDeclaration::addPreInvariant()
+{
+return (vthis && global.params.useInvariants);
+}
+int DtorDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+int DtorDeclaration::isVirtual()
+{
+/* This should be FALSE so that dtor's don't get put into the vtbl[],
+* but doing so will require recompiling everything.
+*/
+#if BREAKABI
+return FALSE;
+#else
+return FuncDeclaration::isVirtual();
+#endif
+}
+void DtorDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (hgs->hdrgen)
+	return;
+buf->writestring("~this()");
+bodyToCBuffer(buf, hgs);
+}
+/********************************* StaticCtorDeclaration ****************************/
+StaticCtorDeclaration::StaticCtorDeclaration(Loc loc, Loc endloc)
+: FuncDeclaration(loc, endloc,
+Identifier::generateId("_staticCtor"), STCstatic, NULL)
+{
+}
+Dsymbol *StaticCtorDeclaration::syntaxCopy(Dsymbol *s)
+{
+StaticCtorDeclaration *scd;
+assert(!s);
+scd = new StaticCtorDeclaration(loc, endloc);
+return FuncDeclaration::syntaxCopy(scd);
+}
+void StaticCtorDeclaration::semantic(Scope *sc)
+{
+//printf("StaticCtorDeclaration::semantic()\n");
+type = new TypeFunction(NULL, Type::tvoid, FALSE, LINKd);
+/* If the static ctor appears within a template instantiation,
+* it could get called multiple times by the module constructors
+* for different modules. Thus, protect it with a gate.
+*/
+if (inTemplateInstance())
+{
+	/* Add this prefix to the function:
+	 *	static int gate;
+	 *	if (++gate != 1) return;
+	 * Note that this is not thread safe; should not have threads
+	 * during static construction.
+	 */
+	Identifier *id = Lexer::idPool("__gate");
+	VarDeclaration *v = new VarDeclaration(0, Type::tint32, id, NULL);
+	v->storage_class = STCstatic;
+	Statements *sa = new Statements();
+	Statement *s = new DeclarationStatement(0, v);
+	sa->push(s);
+	Expression *e = new IdentifierExp(0, id);
+	e = new AddAssignExp(0, e, new IntegerExp(1));
+	e = new EqualExp(TOKnotequal, 0, e, new IntegerExp(1));
+	s = new IfStatement(0, NULL, e, new ReturnStatement(0, NULL), NULL);
+	sa->push(s);
+	if (fbody)
+	    sa->push(fbody);
+	fbody = new CompoundStatement(0, sa);
+}
+FuncDeclaration::semantic(sc);
+// We're going to need ModuleInfo
+Module *m = getModule();
+if (!m)
+	m = sc->module;
+if (m)
+{	m->needmoduleinfo = 1;
+#ifdef IN_GCC
+	m->strictlyneedmoduleinfo = 1;
+#endif
+}
+}
+AggregateDeclaration *StaticCtorDeclaration::isThis()
+{
+return NULL;
+}
+int StaticCtorDeclaration::isStaticConstructor()
+{
+return TRUE;
+}
+int StaticCtorDeclaration::isVirtual()
+{
+return FALSE;
+}
+int StaticCtorDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int StaticCtorDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+void StaticCtorDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (hgs->hdrgen)
+{	buf->writestring("static this();\n");
+	return;
+}
+buf->writestring("static this()");
+bodyToCBuffer(buf, hgs);
+}
+/********************************* StaticDtorDeclaration ****************************/
+StaticDtorDeclaration::StaticDtorDeclaration(Loc loc, Loc endloc)
+: FuncDeclaration(loc, endloc,
+Identifier::generateId("_staticDtor"), STCstatic, NULL)
+{
+vgate = NULL;
+}
+Dsymbol *StaticDtorDeclaration::syntaxCopy(Dsymbol *s)
+{
+StaticDtorDeclaration *sdd;
+assert(!s);
+sdd = new StaticDtorDeclaration(loc, endloc);
+return FuncDeclaration::syntaxCopy(sdd);
+}
+void StaticDtorDeclaration::semantic(Scope *sc)
+{
+ClassDeclaration *cd;
+Type *tret;
+cd = sc->scopesym->isClassDeclaration();
+if (!cd)
+{
+}
+type = new TypeFunction(NULL, Type::tvoid, FALSE, LINKd);
+/* If the static ctor appears within a template instantiation,
+* it could get called multiple times by the module constructors
+* for different modules. Thus, protect it with a gate.
+*/
+if (inTemplateInstance())
+{
+	/* Add this prefix to the function:
+	 *	static int gate;
+	 *	if (--gate != 0) return;
+	 * Increment gate during constructor execution.
+	 * Note that this is not thread safe; should not have threads
+	 * during static destruction.
+	 */
+	Identifier *id = Lexer::idPool("__gate");
+	VarDeclaration *v = new VarDeclaration(0, Type::tint32, id, NULL);
+	v->storage_class = STCstatic;
+	Statements *sa = new Statements();
+	Statement *s = new DeclarationStatement(0, v);
+	sa->push(s);
+	Expression *e = new IdentifierExp(0, id);
+	e = new AddAssignExp(0, e, new IntegerExp(-1));
+	e = new EqualExp(TOKnotequal, 0, e, new IntegerExp(0));
+	s = new IfStatement(0, NULL, e, new ReturnStatement(0, NULL), NULL);
+	sa->push(s);
+	if (fbody)
+	    sa->push(fbody);
+	fbody = new CompoundStatement(0, sa);
+	vgate = v;
+}
+FuncDeclaration::semantic(sc);
+// We're going to need ModuleInfo
+Module *m = getModule();
+if (!m)
+	m = sc->module;
+if (m)
+{	m->needmoduleinfo = 1;
+#ifdef IN_GCC
+	m->strictlyneedmoduleinfo = 1;
+#endif
+}
+}
+AggregateDeclaration *StaticDtorDeclaration::isThis()
+{
+return NULL;
+}
+int StaticDtorDeclaration::isStaticDestructor()
+{
+return TRUE;
+}
+int StaticDtorDeclaration::isVirtual()
+{
+return FALSE;
+}
+int StaticDtorDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int StaticDtorDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+void StaticDtorDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (hgs->hdrgen)
+	return;
+buf->writestring("static ~this()");
+bodyToCBuffer(buf, hgs);
+}
+/********************************* InvariantDeclaration ****************************/
+InvariantDeclaration::InvariantDeclaration(Loc loc, Loc endloc)
+: FuncDeclaration(loc, endloc, Id::classInvariant, STCundefined, NULL)
+{
+}
+Dsymbol *InvariantDeclaration::syntaxCopy(Dsymbol *s)
+{
+InvariantDeclaration *id;
+assert(!s);
+id = new InvariantDeclaration(loc, endloc);
+FuncDeclaration::syntaxCopy(id);
+return id;
+}
+void InvariantDeclaration::semantic(Scope *sc)
+{
+AggregateDeclaration *ad;
+Type *tret;
+parent = sc->parent;
+Dsymbol *parent = toParent();
+ad = parent->isAggregateDeclaration();
+if (!ad)
+{
+	error("invariants only are for struct/union/class definitions");
+	return;
+}
+else if (ad->inv && ad->inv != this)
+{
+	error("more than one invariant for %s", ad->toChars());
+}
+ad->inv = this;
+type = new TypeFunction(NULL, Type::tvoid, FALSE, LINKd);
+sc = sc->push();
+sc->stc &= ~STCstatic;		// not a static invariant
+sc->incontract++;
+sc->linkage = LINKd;
+FuncDeclaration::semantic(sc);
+sc->pop();
+}
+int InvariantDeclaration::isVirtual()
+{
+return FALSE;
+}
+int InvariantDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int InvariantDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+void InvariantDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (hgs->hdrgen)
+	return;
+buf->writestring("invariant");
+bodyToCBuffer(buf, hgs);
+}
+/********************************* UnitTestDeclaration ****************************/
+/*******************************
+* Generate unique unittest function Id so we can have multiple
+* instances per module.
+*/
+static Identifier *unitTestId()
+{
+return Lexer::uniqueId("__unittest");
+}
+UnitTestDeclaration::UnitTestDeclaration(Loc loc, Loc endloc)
+: FuncDeclaration(loc, endloc, unitTestId(), STCundefined, NULL)
+{
+}
+Dsymbol *UnitTestDeclaration::syntaxCopy(Dsymbol *s)
+{
+UnitTestDeclaration *utd;
+assert(!s);
+utd = new UnitTestDeclaration(loc, endloc);
+return FuncDeclaration::syntaxCopy(utd);
+}
+void UnitTestDeclaration::semantic(Scope *sc)
+{
+if (global.params.useUnitTests)
+{
+	Type *tret;
+	type = new TypeFunction(NULL, Type::tvoid, FALSE, LINKd);
+	FuncDeclaration::semantic(sc);
+}
+// We're going to need ModuleInfo even if the unit tests are not
+// compiled in, because other modules may import this module and refer
+// to this ModuleInfo.
+Module *m = getModule();
+if (!m)
+	m = sc->module;
+if (m)
+	m->needmoduleinfo = 1;
+}
+AggregateDeclaration *UnitTestDeclaration::isThis()
+{
+return NULL;
+}
+int UnitTestDeclaration::isVirtual()
+{
+return FALSE;
+}
+int UnitTestDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int UnitTestDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+void UnitTestDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+if (hgs->hdrgen)
+	return;
+buf->writestring("unittest");
+bodyToCBuffer(buf, hgs);
+}
+/********************************* NewDeclaration ****************************/
+NewDeclaration::NewDeclaration(Loc loc, Loc endloc, Arguments *arguments, int varargs)
+: FuncDeclaration(loc, endloc, Id::classNew, STCstatic, NULL)
+{
+this->arguments = arguments;
+this->varargs = varargs;
+}
+Dsymbol *NewDeclaration::syntaxCopy(Dsymbol *s)
+{
+NewDeclaration *f;
+f = new NewDeclaration(loc, endloc, NULL, varargs);
+FuncDeclaration::syntaxCopy(f);
+f->arguments = Argument::arraySyntaxCopy(arguments);
+return f;
+}
+void NewDeclaration::semantic(Scope *sc)
+{
+ClassDeclaration *cd;
+Type *tret;
+//printf("NewDeclaration::semantic()\n");
+parent = sc->parent;
+Dsymbol *parent = toParent();
+cd = parent->isClassDeclaration();
+if (!cd && !parent->isStructDeclaration())
+{
+	error("new allocators only are for class or struct definitions");
+}
+tret = Type::tvoid->pointerTo();
+type = new TypeFunction(arguments, tret, varargs, LINKd);
+type = type->semantic(loc, sc);
+assert(type->ty == Tfunction);
+// Check that there is at least one argument of type uint
+TypeFunction *tf = (TypeFunction *)type;
+if (Argument::dim(tf->parameters) < 1)
+{
+	error("at least one argument of type uint expected");
+}
+else
+{
+	Argument *a = Argument::getNth(tf->parameters, 0);
+	if (!a->type->equals(Type::tuns32))
+	    error("first argument must be type uint, not %s", a->type->toChars());
+}
+FuncDeclaration::semantic(sc);
+}
+const char *NewDeclaration::kind()
+{
+return "allocator";
+}
+int NewDeclaration::isVirtual()
+{
+return FALSE;
+}
+int NewDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int NewDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+void NewDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+buf->writestring("new");
+Argument::argsToCBuffer(buf, hgs, arguments, varargs);
+bodyToCBuffer(buf, hgs);
+}
+/********************************* DeleteDeclaration ****************************/
+DeleteDeclaration::DeleteDeclaration(Loc loc, Loc endloc, Arguments *arguments)
+: FuncDeclaration(loc, endloc, Id::classDelete, STCstatic, NULL)
+{
+this->arguments = arguments;
+}
+Dsymbol *DeleteDeclaration::syntaxCopy(Dsymbol *s)
+{
+DeleteDeclaration *f;
+f = new DeleteDeclaration(loc, endloc, NULL);
+FuncDeclaration::syntaxCopy(f);
+f->arguments = Argument::arraySyntaxCopy(arguments);
+return f;
+}
+void DeleteDeclaration::semantic(Scope *sc)
+{
+ClassDeclaration *cd;
+//printf("DeleteDeclaration::semantic()\n");
+parent = sc->parent;
+Dsymbol *parent = toParent();
+cd = parent->isClassDeclaration();
+if (!cd && !parent->isStructDeclaration())
+{
+	error("new allocators only are for class or struct definitions");
+}
+type = new TypeFunction(arguments, Type::tvoid, 0, LINKd);
+type = type->semantic(loc, sc);
+assert(type->ty == Tfunction);
+// Check that there is only one argument of type void*
+TypeFunction *tf = (TypeFunction *)type;
+if (Argument::dim(tf->parameters) != 1)
+{
+	error("one argument of type void* expected");
+}
+else
+{
+	Argument *a = Argument::getNth(tf->parameters, 0);
+	if (!a->type->equals(Type::tvoid->pointerTo()))
+	    error("one argument of type void* expected, not %s", a->type->toChars());
+}
+FuncDeclaration::semantic(sc);
+}
+const char *DeleteDeclaration::kind()
+{
+return "deallocator";
+}
+int DeleteDeclaration::isDelete()
+{
+return TRUE;
+}
+int DeleteDeclaration::isVirtual()
+{
+return FALSE;
+}
+int DeleteDeclaration::addPreInvariant()
+{
+return FALSE;
+}
+int DeleteDeclaration::addPostInvariant()
+{
+return FALSE;
+}
+void DeleteDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
+{
+buf->writestring("delete");
+Argument::argsToCBuffer(buf, hgs, arguments, 0);
+bodyToCBuffer(buf, hgs);
+}

Mercurial > projects > ldc

comparison dmd2/func.c @ 758:f04dde6e882c