jyapayne/swig
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
swig/SWIG/Source/Modules/allocate.cxx
William S Fulton 3327e7095c gcc -Wall warnings fix 
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4426 626c5289-ae23-0410-ae9c-e8d60b6d4f22
2003-03-03 23:29:53 +00:00

602 lines
17 KiB
C++
Raw Blame History

/* -----------------------------------------------------------------------------
* allocate.cxx
*
* This module tries to figure out which classes and structures support
* default constructors and destructors in C++. There are several rules that
* define this behavior including pure abstract methods, private sections,
* and non-default constructors in base classes. See the ARM or
* Doc/Manual/SWIGPlus.html for details.
*
* Author(s) : David Beazley (beazley@cs.uchicago.edu)
*
* Copyright (C) 1998-2002. The University of Chicago
* Copyright (C) 1995-1998. The University of Utah and The Regents of the
* University of California.
*
* See the file LICENSE for information on usage and redistribution.
* ----------------------------------------------------------------------------- */
char cvsroot_allocate_cxx[] = "$Header$";
#include "swigmod.h"
static int virtual_elimination_mode = 0; /* set to 0 on default */
/* Set virtual_elimination_mode */
void Wrapper_virtual_elimination_mode_set(int flag) {
virtual_elimination_mode = flag;
}
/* Helper function to assist with abstract class checking.
This is a major hack. Sorry. */
static String *search_decl = 0; /* Declarator being searched */
static int check_implemented(Node *n) {
String *local_decl;
if (!n) return 0;
while (n) {
if (Strcmp(nodeType(n), "cdecl") == 0) {
local_decl = Getattr(n,"decl");
if (SwigType_isfunction(local_decl)) {
SwigType *decl1 = SwigType_typedef_resolve_all(local_decl);
SwigType *decl2 = SwigType_pop_function(decl1);
if (Strcmp(decl2, search_decl) == 0) {
if (!Getattr(n,"abstract")) {
Delete(decl1);
Delete(decl2);
return 1;
}
}
Delete(decl1);
Delete(decl2);
}
}
n = Getattr(n,"csym:nextSibling");
}
return 0;
}
class Allocate : public Dispatcher {
Node *inclass;
enum AccessMode { PUBLIC, PRIVATE, PROTECTED };
AccessMode cplus_mode;
int extendmode;
/* Checks if a virtual function is the same as inherited from the bases */
int function_is_defined_in_bases(Node *c, Node *bases) {
Node *b, *temp;
String *name, *type, *local_decl, *base_decl;
if (!bases)
return 0;
name = Getattr(c, "name");
type = Getattr(c, "type");
local_decl = Getattr(c, "decl");
if (local_decl) {
local_decl = SwigType_typedef_resolve_all(local_decl);
} else {
return 0;
}
/* Width first search */
for (int i = 0; i < Len(bases); i++) {
b = Getitem(bases,i);
temp = firstChild (b);
while (temp) {
base_decl = Getattr(temp, "decl");
if (base_decl) {
base_decl = SwigType_typedef_resolve_all(base_decl);
if ( (checkAttribute(temp, "storage", "virtual")) &&
(checkAttribute(temp, "name", name)) &&
(checkAttribute(temp, "type", type)) &&
(!Strcmp(local_decl, base_decl)) ) {
Setattr(c, "Tiger: defined_in_base", "1");
Setattr(c, "feature:ignore", "1");
Delete(base_decl);
Delete(local_decl);
return 1;
}
Delete(base_decl);
}
temp = nextSibling(temp);
}
}
Delete(local_decl);
for (int j = 0; j < Len(bases); j++) {
b = Getitem(bases,j);
if (function_is_defined_in_bases(c, Getattr(b, "bases")))
return 1;
}
return 0;
}
/* Checks if a class has the same virtual functions as the bases have */
int class_is_defined_in_bases(Node *n) {
Node *c, *bases; /* bases is the closest ancestors of class n */
int defined = 0;
bases = Getattr(n, "bases");
if (!bases) return 0;
c = firstChild(n); /* c is the members of class n */
while (c) {
if (checkAttribute(c, "storage", "virtual")) {
if (function_is_defined_in_bases(c, bases))
defined = 1;
}
c = nextSibling(c);
}
if (defined)
return 1;
else return 0;
}
/* Checks if a class member is the same as inherited from the class bases */
int class_member_is_defined_in_bases(Node *member, Node *classnode) {
Node *bases; /* bases is the closest ancestors of classnode */
int defined = 0;
bases = Getattr(classnode, "bases");
if (!bases) return 0;
if (checkAttribute(member, "storage", "virtual")) {
if (function_is_defined_in_bases(member, bases))
defined = 1;
}
if (defined)
return 1;
else return 0;
}
/* Checks to see if a class is abstract through inheritance */
int is_abstract_inherit(Node *n, Node *base = 0, int first = 0) {
if (!first && (base == n)) return 0;
if (!base) {
/* Root node */
Symtab *stab = Getattr(n,"symtab"); /* Get symbol table for node */
Symtab *oldtab = Swig_symbol_setscope(stab);
int ret = is_abstract_inherit(n,n,1);
Swig_symbol_setscope(oldtab);
return ret;
}
List *abstract = Getattr(base,"abstract");
if (abstract) {
for (int i = 0; i < Len(abstract); i++) {
Node *nn = Getitem(abstract,i);
String *name = Getattr(nn,"name");
String *base_decl = Getattr(nn,"decl");
if (base_decl) base_decl = SwigType_typedef_resolve_all(base_decl);
if (Strstr(name,"~")) continue; /* Don't care about destructors */
/*
int implemented = 0;
Node *dn = Swig_symbol_clookup_local(name,0);
if (!dn) {
Printf(stdout,"node: %x '%s'. base: %x '%s'. member '%s'\n", n, Getattr(n,"name"), base, Getattr(base,"name"), name);
}
assert(dn != 0); // Assertion of doom
*/
if (SwigType_isfunction(base_decl)) {
search_decl = SwigType_pop_function(base_decl);
}
Node *dn = Swig_symbol_clookup_local_check(name,0,check_implemented);
Delete(search_decl);
Delete(base_decl);
/*
while (dn && !implemented) {
String *local_decl = Getattr(dn,"decl");
if (local_decl) local_decl = SwigType_typedef_resolve_all(local_decl);
if (local_decl && !Strcmp(local_decl, base_decl)) {
if (Getattr(dn,"abstract")) return 1;
implemented++;
}
Delete(local_decl);
dn = Getattr(dn,"csym:nextSibling");
}
*/
/* if (!implemented && (Getattr(nn,"abstract"))) {
return 1;
}
*/
if (!dn) return 1;
/*
if (dn && (Getattr(dn,"abstract"))) {
return 1;
}
*/
}
}
List *bases = Getattr(base,"bases");
if (!bases) return 0;
for (int i = 0; i < Len(bases); i++) {
if (is_abstract_inherit(n,Getitem(bases,i))) {
return 1;
}
}
return 0;
}
/* Grab methods used by smart pointers */
List *smart_pointer_methods(Node *cls, List *methods) {
if (!methods) {
methods = NewList();
}
Node *c = firstChild(cls);
String *kind = Getattr(cls,"kind");
int mode;
if (Strcmp(kind,"class") == 0) mode = PRIVATE;
else mode = PUBLIC;
while (c) {
if (Getattr(c,"error") || Getattr(c,"feature:ignore")) {
c = nextSibling(c);
continue;
}
if (Strcmp(nodeType(c),"cdecl") == 0) {
if (!Getattr(c,"feature:ignore")) {
String *storage = Getattr(c,"storage");
if (!((Cmp(storage,"static") == 0) || (Cmp(storage,"typedef") == 0))) {
String *name = Getattr(c,"name");
String *symname = Getattr(c,"sym:name");
Node *e = Swig_symbol_clookup_local(name,0);
if (e && !Getattr(e,"feature:ignore") && (Cmp(symname, Getattr(e,"sym:name")) == 0)) {
Swig_warning(WARN_LANG_DEREF_SHADOW,Getfile(e),Getline(e),"Declaration of '%s' shadows declaration accessible via operator->() at %s:%d\n",
name, Getfile(c),Getline(c));
} else {
/* Make sure node with same name doesn't already exist */
int k;
int match = 0;
for (k = 0; k < Len(methods); k++) {
e = Getitem(methods,k);
if (Cmp(symname,Getattr(e,"sym:name")) == 0) {
match = 1;
break;
}
if ((!symname || (!Getattr(e,"sym:name"))) && (Cmp(name,Getattr(e,"name")) == 0)) {
match = 1;
break;
}
}
if (!match) {
Node *cc = c;
while (cc) {
Append(methods,cc);
cc = Getattr(cc,"sym:nextSibling");
}
}
}
}
}
}
if (Strcmp(nodeType(c),"access") == 0) {
kind = Getattr(c,"kind");
if (Strcmp(kind,"public") == 0) mode = PUBLIC;
else mode = PRIVATE;
}
c = nextSibling(c);
}
/* Look for methods in base classes */
{
Node *bases = Getattr(cls,"bases");
int k;
for (k = 0; k < Len(bases); k++) {
smart_pointer_methods(Getitem(bases,k),methods);
}
}
/* Remove protected/private members */
{
for (int i = 0; i < Len(methods); ) {
Node *n = Getitem(methods,i);
if (checkAttribute(n,"access","protected") || checkAttribute(n,"access","private")) {
Delitem(methods,i);
continue;
}
i++;
}
}
return methods;
}
void mark_exception_classes(ParmList *p) {
while(p) {
SwigType *ty = Getattr(p,"type");
SwigType *t = SwigType_typedef_resolve_all(ty);
Node *c = Swig_symbol_clookup(t,0);
if (c) {
Setattr(c,"cplus:exceptionclass","1");
}
p = nextSibling(p);
}
}
public:
virtual int top(Node *n) {
cplus_mode = PUBLIC;
inclass = 0;
extendmode = 0;
emit_children(n);
return SWIG_OK;
}
virtual int importDirective(Node *n) { return emit_children(n); }
virtual int includeDirective(Node *n) { return emit_children(n); }
virtual int externDeclaration(Node *n) { return emit_children(n); }
virtual int namespaceDeclaration(Node *n) { return emit_children(n); }
virtual int extendDirective(Node *n) {
extendmode = 1;
emit_children(n);
extendmode = 0;
return SWIG_OK;
}
virtual int classDeclaration(Node *n) {
Symtab *symtab = Swig_symbol_current();
Swig_symbol_setscope(Getattr(n,"symtab"));
if (!CPlusPlus) {
/* Always have default constructors/destructors in C */
Setattr(n,"allocate:default_constructor","1");
Setattr(n,"allocate:default_destructor","1");
}
if (Getattr(n,"allocate:visit")) return SWIG_OK;
Setattr(n,"allocate:visit","1");
/* Always visit base classes first */
{
List *bases = Getattr(n,"bases");
if (bases) {
for (int i = 0; i < Len(bases); i++) {
Node *b = Getitem(bases,i);
classDeclaration(b);
}
}
}
inclass = n;
String *kind = Getattr(n,"kind");
if (Strcmp(kind,"class") == 0) {
cplus_mode = PRIVATE;
} else {
cplus_mode = PUBLIC;
}
emit_children(n);
/* Check if the class is abstract via inheritance. This might occur if a class didn't have
any pure virtual methods of its own, but it didn't implement all of the pure methods in
a base class */
if (is_abstract_inherit(n)) {
if ((!Getattr(n,"abstract")) && ((Getattr(n,"allocate:public_constructor") || (!Getattr(n,"feature:nodefault") && !Getattr(n,"allocate:has_constructor"))))) {
if (!Getattr(n,"feature:notabstract")) {
Swig_warning(WARN_TYPE_ABSTRACT,Getfile(n),Getline(n),"Class '%s' might be abstract. No constructors generated. \n", SwigType_namestr(Getattr(n,"name")));
Setattr(n,"abstract",NewList());
}
}
}
if (!Getattr(n,"allocate:has_constructor")) {
/* No constructor is defined. We need to check a few things */
/* If class is abstract. No default constructor. Sorry */
if (Getattr(n,"abstract")) {
Delattr(n,"allocate:default_constructor");
}
if (!Getattr(n,"allocate:default_constructor")) {
/* Check base classes */
List *bases = Getattr(n,"bases");
int allows_default = 1;
for (int i = 0; i < Len(bases); i++) {
Node *n = Getitem(bases,i);
/* If base class does not allow default constructor, we don't allow it either */
if (!Getattr(n,"allocate:default_constructor") && (!Getattr(n,"allocate:default_base_constructor"))) {
allows_default = 0;
}
}
if (allows_default) {
Setattr(n,"allocate:default_constructor","1");
}
}
}
if (!Getattr(n,"allocate:has_destructor")) {
/* No destructor was defined. We need to check a few things here too */
List *bases = Getattr(n,"bases");
int allows_destruct = 1;
for (int i = 0; i < Len(bases); i++) {
Node *n = Getitem(bases,i);
/* If base class does not allow default destructor, we don't allow it either */
if (!Getattr(n,"allocate:default_destructor") && (!Getattr(n,"allocate:default_base_destructor"))) {
allows_destruct = 0;
}
}
if (allows_destruct) {
Setattr(n,"allocate:default_destructor","1");
}
}
/* Check if base classes allow smart pointers, but might be hidden */
if (!Getattr(n,"allocate:smartpointer")) {
Node *sp = Swig_symbol_clookup((char*)"operator ->",0);
if (sp) {
/* Look for parent */
Node *p = parentNode(sp);
if (Strcmp(nodeType(p),"extend") == 0) {
p = parentNode(p);
}
if (Strcmp(nodeType(p),"class") == 0) {
if (Getattr(p,"feature:ignore")) {
Setattr(n,"allocate:smartpointer",Getattr(p,"allocate:smartpointer"));
}
}
}
}
/* Only care about default behavior. Remove temporary values */
Setattr(n,"allocate:visit","1");
inclass = 0;
Swig_symbol_setscope(symtab);
return SWIG_OK;
}
virtual int accessDeclaration(Node *n) {
String *kind = Getattr(n,"kind");
if (Cmp(kind,"public") == 0) {
cplus_mode = PUBLIC;
} else if (Cmp(kind,"private") == 0) {
cplus_mode = PRIVATE;
} else if (Cmp(kind,"protected") == 0) {
cplus_mode = PROTECTED;
}
return SWIG_OK;
}
virtual int cDeclaration(Node *n) {
mark_exception_classes(Getattr(n,"throws"));
if (inclass) {
/* check whether the member node n is defined in class node inclass's bases */
if (virtual_elimination_mode)
if (checkAttribute(n, "storage", "virtual"))
class_member_is_defined_in_bases(n, inclass);
String *name = Getattr(n,"name");
if (cplus_mode != PUBLIC) {
/* Look for a private assignment operator */
if (Strcmp(name,"operator =") == 0) {
Setattr(inclass,"allocate:noassign","1");
}
} else {
/* Look for smart pointer operator */
if ((Strcmp(name,"operator ->") == 0) && (!Getattr(n,"feature:ignore"))) {
/* Look for version with no parameters */
Node *sn = n;
while (sn) {
if (!Getattr(sn,"parms")) {
SwigType *type = SwigType_typedef_resolve_all(Getattr(sn,"type"));
SwigType_push(type,Getattr(sn,"decl"));
Delete(SwigType_pop_function(type));
SwigType *base = SwigType_base(type);
Node *sc = Swig_symbol_clookup(base, 0);
if ((sc) && (Strcmp(nodeType(sc),"class") == 0)) {
if (SwigType_check_decl(type,"p.")) {
List *methods = smart_pointer_methods(sc,0);
Setattr(inclass,"allocate:smartpointer",methods);
break;
} else {
/* Hmmm. The return value is not a pointer. If the type is a value
or reference. We're going to chase it to see if another operator->()
can be found */
if ((SwigType_check_decl(type,"")) || (SwigType_check_decl(type,"r."))) {
Node *nn = Swig_symbol_clookup((char*)"operator ->", Getattr(sc,"symtab"));
if (nn) {
sn = nn;
continue;
} else {
break;
}
} else {
break;
}
}
} else {
break;
}
} else {
break;
}
}
}
}
}
return SWIG_OK;
}
virtual int constructorDeclaration(Node *n) {
if (!inclass) return SWIG_OK;
Parm *parms = Getattr(n,"parms");
mark_exception_classes(Getattr(n,"throws"));
if (!extendmode) {
if (!ParmList_numrequired(parms)) {
/* Class does define a default constructor */
/* However, we had better see where it is defined */
if (cplus_mode == PUBLIC) {
Setattr(inclass,"allocate:default_constructor","1");
} else if (cplus_mode == PROTECTED) {
Setattr(inclass,"allocate:default_base_constructor","1");
}
}
/* Class defines some kind of constructor. May or may not be public */
Setattr(inclass,"allocate:has_constructor","1");
if (cplus_mode == PUBLIC) {
Setattr(inclass,"allocate:public_constructor","1");
}
}
/* See if this is a copy constructor */
if (parms && (ParmList_numrequired(parms) == 1)) {
/* Look for a few cases. X(const X &), X(X &), X(X *) */
String *cc = NewStringf("r.q(const).%s", Getattr(inclass,"name"));
if (Strcmp(cc,Getattr(parms,"type")) == 0) {
Setattr(n,"copy_constructor","1");
}
Delete(cc);
cc = NewStringf("r.%s", Getattr(inclass,"name"));
if (Strcmp(cc,Getattr(parms,"type")) == 0) {
Setattr(n,"copy_constructor","1");
}
Delete(cc);
cc = NewStringf("p.%s", Getattr(inclass,"name"));
String *ty = SwigType_strip_qualifiers(Getattr(parms,"type"));
if (Strcmp(cc,ty) == 0) {
Setattr(n,"copy_constructor","1");
}
Delete(cc);
Delete(ty);
}
return SWIG_OK;
}
virtual int destructorDeclaration(Node *n) {
if (!inclass) return SWIG_OK;
if (!extendmode) {
Setattr(inclass,"allocate:has_destructor","1");
if (cplus_mode == PUBLIC) {
Setattr(inclass,"allocate:default_destructor","1");
} else if (cplus_mode == PROTECTED) {
Setattr(inclass,"allocate:default_base_destructor","1");
}
}
return SWIG_OK;
}
};
void Swig_default_allocators(Node *n) {
if (!n) return;
Allocate *a = new Allocate;
a->top(n);
delete a;
}
Reference in a new issue View git blame Copy permalink