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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 aaade6ded589
children 1860414bf3b7
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// 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.

#ifndef DMD_ENUM_H
#define DMD_ENUM_H

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

#include "root.h"
#include "dsymbol.h"

struct Identifier;
struct Type;
struct Expression;
#ifdef _DH
struct HdrGenState;
#endif


struct EnumDeclaration : ScopeDsymbol
{
    Type *type;			// the TypeEnum
    Type *memtype;		// type of the members

#if DMDV1
    integer_t maxval;
    integer_t minval;
    integer_t defaultval;	// default initializer
#else
    Expression *maxval;
    Expression *minval;
    Expression *defaultval;	// default initializer

    Scope *scope;		// !=NULL means context to use
#endif
    int isdeprecated;

    EnumDeclaration(Loc loc, Identifier *id, Type *memtype);
    Dsymbol *syntaxCopy(Dsymbol *s);
    void semantic(Scope *sc);
    int oneMember(Dsymbol **ps);
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);
    Type *getType();
    const char *kind();
#if DMDV2
    Dsymbol *search(Loc, Identifier *ident, int flags);
#endif
    int isDeprecated();			// is Dsymbol deprecated?

    void emitComment(Scope *sc);
    void toDocBuffer(OutBuffer *buf);

    EnumDeclaration *isEnumDeclaration() { return this; }

    void toObjFile(int multiobj);			// compile to .obj file
    void toDebug();
    int cvMember(unsigned char *p);

    Symbol *sinit;
    Symbol *toInitializer();
};


struct EnumMember : Dsymbol
{
    Expression *value;

    EnumMember(Loc loc, Identifier *id, Expression *value);
    Dsymbol *syntaxCopy(Dsymbol *s);
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);
    const char *kind();

    void emitComment(Scope *sc);
    void toDocBuffer(OutBuffer *buf);

    EnumMember *isEnumMember() { return this; }
};

#endif /* DMD_ENUM_H */