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Fun with parameter attributes: For several of the "synthetic" parameters added to D functions, we can apply noalias and nocapture. They are sret parameters, 'nest' pointers passed to nested functions, and _argptr: Nocapture: - Sret and nest are nocapture because they don't represent D-level variables, and thus the callee can't (validly) obtain a pointer to them, let alone keep it around after it returns. - _argptr is nocapture because although the callee has access to it as a pointer, that pointer is invalidated when it returns. All three are noalias because they're function-local variables - Sret and _argptr are noalias because they're freshly alloca'd memory only used for a single function call that's not allowed to keep an aliasing pointer to it around (since the parameter is nocapture). - 'Nest' is noalias because the callee only ever has access to one such pointer per parent function, and every parent function has a different one. This commit also ensures attributes set on sret, _arguments and _argptr are propagated to calls to such functions. It also adds one exception to the general rule that attributes on function types should propagate to calls: the type of a delegate's function pointer has a 'nest' parameter, but this can either be a true 'nest' (for delegates to nested functions) or a 'this' (for delegates to member functions). Since 'this' is neither noalias nor nocapture, and there's generally no way to tell which one it is, we remove these attributes at the call site if the callee is a delegate.
author Frits van Bommel <fvbommel wxs.nl>
date Sat, 14 Mar 2009 22:15:31 +0100
parents e83ba4ae4878
children def7a1d494fd
line wrap: on
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2007 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.

#ifndef DMD_IMPORT_H
#define DMD_IMPORT_H

#ifdef __DMC__
#pragma once
#endif /* __DMC__ */

#include "dsymbol.h"


struct Identifier;
struct Scope;
struct OutBuffer;
struct Module;
struct Package;
struct AliasDeclaration;
#ifdef _DH
struct HdrGenState;
#endif

struct Import : Dsymbol
{
    Array *packages;		// array of Identifier's representing packages
    Identifier *id;		// module Identifier
    Identifier *aliasId;
    int isstatic;		// !=0 if static import
    enum PROT protection;

    // Pairs of alias=name to bind into current namespace
    Array names;
    Array aliases;

    Array aliasdecls;		// AliasDeclarations for names/aliases

    Module *mod;
    Package *pkg;		// leftmost package/module

    Import(Loc loc, Array *packages, Identifier *id, Identifier *aliasId,
	int isstatic);
    void addAlias(Identifier *name, Identifier *alias);

    const char *kind();
    enum PROT prot();
    Dsymbol *syntaxCopy(Dsymbol *s);	// copy only syntax trees
    void load(Scope *sc);
    void semantic(Scope *sc);
    void semantic2(Scope *sc);
    Dsymbol *toAlias();
    int addMember(Scope *sc, ScopeDsymbol *s, int memnum);
    Dsymbol *search(Loc loc, Identifier *ident, int flags);
    int overloadInsert(Dsymbol *s);
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);

    Import *isImport() { return this; }
};

#endif /* DMD_IMPORT_H */