view gen/tocsym.cpp @ 1117:4c20fcc4252b

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 29c0d1194033
children
line wrap: on
line source


// Copyright (c) 1999-2005 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// 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.

// stubbed out for dmdfe. Original is in dmd/tocsym.c

#include <stddef.h>

#include "mars.h"
#include "module.h"
#include "mtype.h"
#include "declaration.h"
#include "statement.h"
#include "enum.h"
#include "aggregate.h"
#include "init.h"
#include "attrib.h"
#include "lexer.h"


Symbol *StaticStructInitDeclaration::toSymbol()
{
    return 0;
}

/*************************************
 * Helper
 */

Symbol *Dsymbol::toSymbolX(const char *prefix, int sclass, TYPE *t, const char *suffix)
{
  return 0;
}

/*************************************
 */

Symbol *Dsymbol::toSymbol()
{
  return 0;
}

/*********************************
 * Generate import symbol from symbol.
 */

Symbol *Dsymbol::toImport()
{
  return 0;
}

/*************************************
 */

Symbol *Dsymbol::toImport(Symbol *sym)
{
  return 0;
}

/*************************************
 */

Symbol *VarDeclaration::toSymbol()
{
  return 0;
}

/*************************************
 */

Symbol *ClassInfoDeclaration::toSymbol()
{
  return 0;
}

/*************************************
 */

Symbol *ModuleInfoDeclaration::toSymbol()
{
  return 0;
}

/*************************************
 */

Symbol *TypeInfoDeclaration::toSymbol()
{
  return 0;
}

/*************************************
 */

Symbol *FuncDeclaration::toSymbol()
{

    return 0;
}

/*************************************
 */

Symbol *FuncDeclaration::toThunkSymbol(int offset)
{
  return 0;
}

/*************************************
 */

Symbol *FuncAliasDeclaration::toSymbol()
{

    return 0;
}


/****************************************
 * Create a static symbol we can hang DT initializers onto.
 */

Symbol *static_sym()
{
  return 0;
}

/*************************************
 * Create the "ClassInfo" symbol
 */

Symbol *ClassDeclaration::toSymbol()
{
  return 0;
}

/*************************************
 * Create the "InterfaceInfo" symbol
 */

Symbol *InterfaceDeclaration::toSymbol()
{
  return 0;
}

/*************************************
 * Create the "ModuleInfo" symbol
 */

Symbol *Module::toSymbol()
{
  return 0;
}

/*************************************
 * This is accessible via the ClassData, but since it is frequently
 * needed directly (like for rtti comparisons), make it directly accessible.
 */

Symbol *ClassDeclaration::toVtblSymbol()
{
  return 0;
}

/**********************************
 * Create the static initializer for the struct/class.
 */

Symbol *AggregateDeclaration::toInitializer()
{
  return 0;
}


/******************************************
 */

Symbol *Module::toModuleAssert()
{
  return 0;
}

/******************************************
 */

Symbol *Module::toModuleArray()
{
  return 0;
}

/********************************************
 * Determine the right symbol to look up
 * an associative array element.
 * Input:
 *	flags	0	don't add value signature
 *		1	add value signature
 */

Symbol *TypeAArray::aaGetSymbol(const char *func, int flags)
{
  return 0;
}