static Node *template_locate(String *name, Parm *tparms, Symtab *tscope) {
Node *n;
String *tname, *rname = 0;
Node *templ;
List *mpartials = 0;
Parm *p;
Parm *parms;
Parm *targs;
ParmList *expandedparms;
tname = Copy(name);
parms = CopyParmList(tparms);
/* Search for generic template */
templ = Swig_symbol_clookup(name, 0);
/* Add default values from generic template */
if (templ) {
Symtab *tsdecl = Getattr(templ, "sym:symtab");
targs = Getattr(templ, "templateparms");
expandedparms = Swig_symbol_template_defargs(parms, targs, tscope, tsdecl);
} else {
expandedparms = parms;
}
/* reduce the typedef */
p = expandedparms;
while (p) {
SwigType *ty = Getattr(p, "type");
if (ty) {
SwigType *nt = Swig_symbol_type_qualify(ty, tscope);
Setattr(p, "type", nt);
Delete(nt);
}
p = nextSibling(p);
}
SwigType_add_template(tname, expandedparms);
if (template_debug) {
Printf(stdout, "\n%s:%d: template_debug: Searching for %s\n", cparse_file, cparse_line, tname);
}
/* Search for an exact specialization.
Example: template<> class name<int> { ... } */
{
if (template_debug) {
Printf(stdout, " searching: '%s' (exact specialization)\n", tname);
}
n = Swig_symbol_clookup_local(tname, 0);
if (!n) {
SwigType *rname = Swig_symbol_typedef_reduce(tname, tscope);
if (!Equal(rname, tname)) {
if (template_debug) {
Printf(stdout, " searching: '%s' (exact specialization)\n", rname);
}
n = Swig_symbol_clookup_local(rname, 0);
}
Delete(rname);
}
if (n) {
Node *tn;
String *nodeType = nodeType(n);
if (Equal(nodeType, "template"))
goto success;
tn = Getattr(n, "template");
if (tn) {
n = tn;
goto success; /* Previously wrapped by a template return that */
}
Swig_error(cparse_file, cparse_line, "'%s' is not defined as a template. (%s)\n", name, nodeType(n));
Delete(tname);
Delete(parms);
return 0; /* Found a match, but it's not a template of any kind. */
}
}
/* Search for partial specialization.
Example: template<typename T> class name<T *> { ... } */
/* Generate reduced template name (stripped of extraneous pointers, etc.) */
rname = NewStringf("%s<(", name);
p = parms;
while (p) {
String *t;
t = Getattr(p, "type");
if (!t)
t = Getattr(p, "value");
if (t) {
String *ty = Swig_symbol_typedef_reduce(t, tscope);
String *tb = SwigType_base(ty);
String *td = SwigType_default(ty);
Replaceid(td, "enum SWIGTYPE", tb);
Replaceid(td, "SWIGTYPE", tb);
Append(rname, td);
Delete(tb);
Delete(ty);
Delete(td);
}
p = nextSibling(p);
if (p) {
Append(rname, ",");
}
}
Append(rname, ")>");
mpartials = NewList();
if (templ) {
/* First, we search using an exact type prototype */
Parm *p;
char tmp[32];
int i;
List *partials;
String *ss;
Iterator pi;
partials = Getattr(templ, "partials");
if (partials) {
for (pi = First(partials); pi.item; pi = Next(pi)) {
ss = Copy(pi.item);
p = parms;
i = 1;
while (p) {
String *t, *tn;
sprintf(tmp, "$%d", i);
t = Getattr(p, "type");
if (!t)
t = Getattr(p, "value");
if (t) {
String *ty = Swig_symbol_typedef_reduce(t, tscope);
tn = SwigType_base(ty);
Replaceid(ss, tmp, tn);
Delete(tn);
Delete(ty);
}
i++;
p = nextSibling(p);
}
if (template_debug) {
Printf(stdout, " searching: '%s' (partial specialization - %s)\n", ss, pi.item);
}
if ((Equal(ss, tname)) || (Equal(ss, rname))) {
Append(mpartials, pi.item);
}
Delete(ss);
}
}
}
if (template_debug) {
Printf(stdout, " Matched partials: %s\n", mpartials);
}
if (Len(mpartials)) {
String *s = Getitem(mpartials, 0);
n = Swig_symbol_clookup_local(s, 0);
if (Len(mpartials) > 1) {
if (n) {
Swig_warning(WARN_PARSE_TEMPLATE_AMBIG, cparse_file, cparse_line, "Instantiation of template '%s' is ambiguous,\n", SwigType_namestr(tname));
Swig_warning(WARN_PARSE_TEMPLATE_AMBIG, Getfile(n), Getline(n), " instantiation '%s' is used.\n", SwigType_namestr(Getattr(n, "name")));
}
}
}
if (!n) {
n = templ;
}
if (!n) {
Swig_error(cparse_file, cparse_line, "Template '%s' undefined.\n", name);
} else if (n) {
String *nodeType = nodeType(n);
if (!Equal(nodeType, "template")) {
Swig_error(cparse_file, cparse_line, "'%s' is not defined as a template. (%s)\n", name, nodeType);
n = 0;
}
}
success:
Delete(tname);
Delete(rname);
Delete(mpartials);
if ((template_debug) && (n)) {
Printf(stdout, "Node: %p\n", n);
Swig_print_node(n);
}
Delete(parms);
return n;
}
static Node *template_locate(String *name, Parm *tparms, Symtab *tscope) {
Node *n = 0;
String *tname = 0;
Node *templ;
Symtab *primary_scope = 0;
List *possiblepartials = 0;
Parm *p;
Parm *parms = 0;
Parm *targs;
ParmList *expandedparms;
int *priorities_matrix = 0;
int max_possible_partials = 0;
int posslen = 0;
/* Search for primary (unspecialized) template */
templ = Swig_symbol_clookup(name, 0);
if (template_debug) {
tname = Copy(name);
SwigType_add_template(tname, tparms);
Printf(stdout, "\n");
Swig_diagnostic(cparse_file, cparse_line, "template_debug: Searching for match to: '%s'\n", tname);
Delete(tname);
tname = 0;
}
if (templ) {
tname = Copy(name);
parms = CopyParmList(tparms);
/* All template specializations must be in the primary template's scope, store the symbol table for this scope for specialization lookups */
primary_scope = Getattr(templ, "sym:symtab");
/* Add default values from primary template */
targs = Getattr(templ, "templateparms");
expandedparms = Swig_symbol_template_defargs(parms, targs, tscope, primary_scope);
/* reduce the typedef */
p = expandedparms;
while (p) {
SwigType *ty = Getattr(p, "type");
if (ty) {
SwigType *nt = Swig_symbol_type_qualify(ty, tscope);
Setattr(p, "type", nt);
Delete(nt);
}
p = nextSibling(p);
}
SwigType_add_template(tname, expandedparms);
/* Search for an explicit (exact) specialization. Example: template<> class name<int> { ... } */
{
if (template_debug) {
Printf(stdout, " searching for : '%s' (explicit specialization)\n", tname);
}
n = Swig_symbol_clookup_local(tname, primary_scope);
if (!n) {
SwigType *rname = Swig_symbol_typedef_reduce(tname, tscope);
if (!Equal(rname, tname)) {
if (template_debug) {
Printf(stdout, " searching for : '%s' (explicit specialization with typedef reduction)\n", rname);
}
n = Swig_symbol_clookup_local(rname, primary_scope);
}
Delete(rname);
}
if (n) {
Node *tn;
String *nodeType = nodeType(n);
if (Equal(nodeType, "template")) {
if (template_debug) {
Printf(stdout, " explicit specialization found: '%s'\n", Getattr(n, "name"));
}
goto success;
}
tn = Getattr(n, "template");
if (tn) {
if (template_debug) {
Printf(stdout, " previous instantiation found: '%s'\n", Getattr(n, "name"));
}
n = tn;
goto success; /* Previously wrapped by a template instantiation */
}
Swig_error(cparse_file, cparse_line, "'%s' is not defined as a template. (%s)\n", name, nodeType(n));
Delete(tname);
Delete(parms);
return 0; /* Found a match, but it's not a template of any kind. */
}
}
/* Search for partial specializations.
* Example: template<typename T> class name<T *> { ... }
* There are 3 types of template arguments:
* (1) Template type arguments
* (2) Template non type arguments
* (3) Template template arguments
* only (1) is really supported for partial specializations
*/
/* Rank each template parameter against the desired template parameters then build a matrix of best matches */
possiblepartials = NewList();
{
char tmp[32];
List *partials;
partials = Getattr(templ, "partials"); /* note that these partial specializations do not include explicit specializations */
if (partials) {
Iterator pi;
int parms_len = ParmList_len(parms);
int *priorities_row;
max_possible_partials = Len(partials);
priorities_matrix = (int *)malloc(sizeof(int) * max_possible_partials * parms_len); /* slightly wasteful allocation for max possible matches */
priorities_row = priorities_matrix;
for (pi = First(partials); pi.item; pi = Next(pi)) {
Parm *p = parms;
int all_parameters_match = 1;
int i = 1;
Parm *partialparms = Getattr(pi.item, "partialparms");
Parm *pp = partialparms;
String *templcsymname = Getattr(pi.item, "templcsymname");
if (template_debug) {
Printf(stdout, " checking match: '%s' (partial specialization)\n", templcsymname);
}
if (ParmList_len(partialparms) == parms_len) {
while (p && pp) {
SwigType *t;
sprintf(tmp, "$%d", i);
t = Getattr(p, "type");
if (!t)
t = Getattr(p, "value");
if (t) {
EMatch match = does_parm_match(t, Getattr(pp, "type"), tmp, tscope, priorities_row + i - 1);
if (match < (int)PartiallySpecializedMatch) {
all_parameters_match = 0;
break;
}
}
i++;
p = nextSibling(p);
pp = nextSibling(pp);
}
if (all_parameters_match) {
Append(possiblepartials, pi.item);
priorities_row += parms_len;
}
}
}
}
}
posslen = Len(possiblepartials);
if (template_debug) {
int i;
if (posslen == 0)
Printf(stdout, " matched partials: NONE\n");
else if (posslen == 1)
Printf(stdout, " chosen partial: '%s'\n", Getattr(Getitem(possiblepartials, 0), "templcsymname"));
else {
Printf(stdout, " possibly matched partials:\n");
for (i = 0; i < posslen; i++) {
Printf(stdout, " '%s'\n", Getattr(Getitem(possiblepartials, i), "templcsymname"));
}
}
}
if (posslen > 1) {
/* Now go through all the possibly matched partial specialization templates and look for a non-ambiguous match.
* Exact matches rank the highest and deduced parameters are ranked by how specialized they are, eg looking for
* a match to const int *, the following rank (highest to lowest):
* const int * (exact match)
* const T *
* T *
* T
*
* An ambiguous example when attempting to match as either specialization could match: %template() X<int *, double *>;
* template<typename T1, typename T2> X class {}; // primary template
* template<typename T1> X<T1, double *> class {}; // specialization (1)
* template<typename T2> X<int *, T2> class {}; // specialization (2)
*/
if (template_debug) {
int row, col;
int parms_len = ParmList_len(parms);
Printf(stdout, " parameter priorities matrix (%d parms):\n", parms_len);
for (row = 0; row < posslen; row++) {
int *priorities_row = priorities_matrix + row*parms_len;
Printf(stdout, " ");
for (col = 0; col < parms_len; col++) {
Printf(stdout, "%5d ", priorities_row[col]);
}
Printf(stdout, "\n");
}
}
{
int row, col;
int parms_len = ParmList_len(parms);
/* Printf(stdout, " parameter priorities inverse matrix (%d parms):\n", parms_len); */
for (col = 0; col < parms_len; col++) {
int *priorities_col = priorities_matrix + col;
int maxpriority = -1;
/*
Printf(stdout, "max_possible_partials: %d col:%d\n", max_possible_partials, col);
Printf(stdout, " ");
*/
/* determine the highest rank for this nth parameter */
for (row = 0; row < posslen; row++) {
int *element_ptr = priorities_col + row*parms_len;
int priority = *element_ptr;
if (priority > maxpriority)
maxpriority = priority;
/* Printf(stdout, "%5d ", priority); */
}
/* Printf(stdout, "\n"); */
/* flag all the parameters which equal the highest rank */
for (row = 0; row < posslen; row++) {
int *element_ptr = priorities_col + row*parms_len;
int priority = *element_ptr;
*element_ptr = (priority >= maxpriority) ? 1 : 0;
}
}
}
{
int row, col;
int parms_len = ParmList_len(parms);
Iterator pi = First(possiblepartials);
Node *chosenpartials = NewList();
if (template_debug)
Printf(stdout, " priority flags matrix:\n");
for (row = 0; row < posslen; row++) {
int *priorities_row = priorities_matrix + row*parms_len;
int highest_count = 0; /* count of highest priority parameters */
for (col = 0; col < parms_len; col++) {
highest_count += priorities_row[col];
}
if (template_debug) {
Printf(stdout, " ");
for (col = 0; col < parms_len; col++) {
Printf(stdout, "%5d ", priorities_row[col]);
}
Printf(stdout, "\n");
}
if (highest_count == parms_len) {
Append(chosenpartials, pi.item);
}
pi = Next(pi);
}
if (Len(chosenpartials) > 0) {
/* one or more best match found */
Delete(possiblepartials);
possiblepartials = chosenpartials;
posslen = Len(possiblepartials);
} else {
/* no best match found */
Delete(chosenpartials);
}
}
}
if (posslen > 0) {
String *s = Getattr(Getitem(possiblepartials, 0), "templcsymname");
n = Swig_symbol_clookup_local(s, primary_scope);
if (posslen > 1) {
int i;
if (n) {
Swig_warning(WARN_PARSE_TEMPLATE_AMBIG, cparse_file, cparse_line, "Instantiation of template '%s' is ambiguous,\n", SwigType_namestr(tname));
Swig_warning(WARN_PARSE_TEMPLATE_AMBIG, Getfile(n), Getline(n), " instantiation '%s' used,\n", SwigType_namestr(Getattr(n, "name")));
}
for (i = 1; i < posslen; i++) {
String *templcsymname = Getattr(Getitem(possiblepartials, i), "templcsymname");
Node *ignored_node = Swig_symbol_clookup_local(templcsymname, primary_scope);
assert(ignored_node);
Swig_warning(WARN_PARSE_TEMPLATE_AMBIG, Getfile(ignored_node), Getline(ignored_node), " instantiation '%s' ignored.\n", SwigType_namestr(Getattr(ignored_node, "name")));
}
}
}
if (!n) {
if (template_debug) {
Printf(stdout, " chosen primary template: '%s'\n", Getattr(templ, "name"));
}
n = templ;
}
} else {
if (template_debug) {
Printf(stdout, " primary template not found\n");
}
/* Give up if primary (unspecialized) template not found as specializations will only exist if there is a primary template */
n = 0;
}
if (!n) {
Swig_error(cparse_file, cparse_line, "Template '%s' undefined.\n", name);
} else if (n) {
String *nodeType = nodeType(n);
if (!Equal(nodeType, "template")) {
Swig_error(cparse_file, cparse_line, "'%s' is not defined as a template. (%s)\n", name, nodeType);
n = 0;
}
}
success:
Delete(tname);
Delete(possiblepartials);
if ((template_debug) && (n)) {
/*
Printf(stdout, "Node: %p\n", n);
Swig_print_node(n);
*/
Printf(stdout, " chosen template:'%s'\n", Getattr(n, "name"));
}
Delete(parms);
free(priorities_matrix);
return n;
}
