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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 788401029ecf
children eeb8b95ea92e
line wrap: on
line source


// 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 INIT_H
#define INIT_H

#include "root.h"

#include "mars.h"
#include "arraytypes.h"

struct Identifier;
struct Expression;
struct Scope;
struct Type;
struct dt_t;
struct AggregateDeclaration;
struct VoidInitializer;
struct StructInitializer;
struct ArrayInitializer;
struct ExpInitializer;
struct StructInitializer;
#ifdef _DH
struct HdrGenState;
#endif

struct Initializer : Object
{
    Loc loc;

    Initializer(Loc loc);
    virtual Initializer *syntaxCopy();
    virtual Initializer *semantic(Scope *sc, Type *t);
    virtual Type *inferType(Scope *sc);
    virtual Expression *toExpression() = 0;
    virtual void toCBuffer(OutBuffer *buf, HdrGenState *hgs) = 0;
    char *toChars();

    static Initializers *arraySyntaxCopy(Initializers *ai);

    virtual dt_t *toDt();

    virtual VoidInitializer *isVoidInitializer() { return NULL; }
    virtual StructInitializer  *isStructInitializer()  { return NULL; }
    virtual ArrayInitializer  *isArrayInitializer()  { return NULL; }
    virtual ExpInitializer  *isExpInitializer()  { return NULL; }
};

struct VoidInitializer : Initializer
{
    Type *type;		// type that this will initialize to

    VoidInitializer(Loc loc);
    Initializer *syntaxCopy();
    Initializer *semantic(Scope *sc, Type *t);
    Expression *toExpression();
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);

    dt_t *toDt();

    virtual VoidInitializer *isVoidInitializer() { return this; }
};

struct StructInitializer : Initializer
{
    Identifiers field;	// of Identifier *'s
    Initializers value;	// parallel array of Initializer *'s

    Array vars;		// parallel array of VarDeclaration *'s
    AggregateDeclaration *ad;	// which aggregate this is for

    StructInitializer(Loc loc);
    Initializer *syntaxCopy();
    void addInit(Identifier *field, Initializer *value);
    Initializer *semantic(Scope *sc, Type *t);
    Expression *toExpression();
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);

    dt_t *toDt();

    StructInitializer  *isStructInitializer()  { return this; }
};

struct ArrayInitializer : Initializer
{
    Expressions index;	// indices
    Initializers value;	// of Initializer *'s
    unsigned dim;	// length of array being initialized
    Type *type;		// type that array will be used to initialize
    int sem;		// !=0 if semantic() is run

    ArrayInitializer(Loc loc);
    Initializer *syntaxCopy();
    void addInit(Expression *index, Initializer *value);
    Initializer *semantic(Scope *sc, Type *t);
    Type *inferType(Scope *sc);
    Expression *toExpression();
    Initializer *toAssocArrayInitializer();
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);

    dt_t *toDt();
    dt_t *toDtBit();	// for bit arrays

    ArrayInitializer *isArrayInitializer() { return this; }
};

struct ExpInitializer : Initializer
{
    Expression *exp;

    ExpInitializer(Loc loc, Expression *exp);
    Initializer *syntaxCopy();
    Initializer *semantic(Scope *sc, Type *t);
    Type *inferType(Scope *sc);
    Expression *toExpression();
    void toCBuffer(OutBuffer *buf, HdrGenState *hgs);

    dt_t *toDt();

    virtual ExpInitializer *isExpInitializer() { return this; }
};

#endif