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cp-support.c
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/* Helper routines for C++ support in GDB.
Copyright (C) 2002-2015 Free Software Foundation, Inc.
Contributed by MontaVista Software.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "cp-support.h"
#include "demangle.h"
#include "gdbcmd.h"
#include "dictionary.h"
#include "objfiles.h"
#include "frame.h"
#include "symtab.h"
#include "block.h"
#include "complaints.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "cp-abi.h"
#include "namespace.h"
#include <signal.h>
#include "safe-ctype.h"
#define d_left(dc) (dc)->u.s_binary.left
#define d_right(dc) (dc)->u.s_binary.right
/* Functions related to demangled name parsing. */
static unsigned int cp_find_first_component_aux (const char *name,
int permissive);
static void demangled_name_complaint (const char *name);
/* Functions/variables related to overload resolution. */
static int sym_return_val_size = -1;
static int sym_return_val_index;
static struct symbol **sym_return_val;
static void overload_list_add_symbol (struct symbol *sym,
const char *oload_name);
static void make_symbol_overload_list_using (const char *func_name,
const char *the_namespace);
static void make_symbol_overload_list_qualified (const char *func_name);
/* The list of "maint cplus" commands. */
struct cmd_list_element *maint_cplus_cmd_list = NULL;
/* The actual commands. */
static void maint_cplus_command (char *arg, int from_tty);
static void first_component_command (char *arg, int from_tty);
/* A list of typedefs which should not be substituted by replace_typedefs. */
static const char * const ignore_typedefs[] =
{
"std::istream", "std::iostream", "std::ostream", "std::string"
};
static void
replace_typedefs (struct demangle_parse_info *info,
struct demangle_component *ret_comp,
canonicalization_ftype *finder,
void *data);
/* A convenience function to copy STRING into OBSTACK, returning a pointer
to the newly allocated string and saving the number of bytes saved in LEN.
It does not copy the terminating '\0' byte! */
static char *
copy_string_to_obstack (struct obstack *obstack, const char *string,
long *len)
{
*len = strlen (string);
return obstack_copy (obstack, string, *len);
}
/* A cleanup wrapper for cp_demangled_name_parse_free. */
static void
do_demangled_name_parse_free_cleanup (void *data)
{
struct demangle_parse_info *info = (struct demangle_parse_info *) data;
cp_demangled_name_parse_free (info);
}
/* Create a cleanup for C++ name parsing. */
struct cleanup *
make_cleanup_cp_demangled_name_parse_free (struct demangle_parse_info *info)
{
return make_cleanup (do_demangled_name_parse_free_cleanup, info);
}
/* Return 1 if STRING is clearly already in canonical form. This
function is conservative; things which it does not recognize are
assumed to be non-canonical, and the parser will sort them out
afterwards. This speeds up the critical path for alphanumeric
identifiers. */
static int
cp_already_canonical (const char *string)
{
/* Identifier start character [a-zA-Z_]. */
if (!ISIDST (string[0]))
return 0;
/* These are the only two identifiers which canonicalize to other
than themselves or an error: unsigned -> unsigned int and
signed -> int. */
if (string[0] == 'u' && strcmp (&string[1], "nsigned") == 0)
return 0;
else if (string[0] == 's' && strcmp (&string[1], "igned") == 0)
return 0;
/* Identifier character [a-zA-Z0-9_]. */
while (ISIDNUM (string[1]))
string++;
if (string[1] == '\0')
return 1;
else
return 0;
}
/* Inspect the given RET_COMP for its type. If it is a typedef,
replace the node with the typedef's tree.
Returns 1 if any typedef substitutions were made, 0 otherwise. */
static int
inspect_type (struct demangle_parse_info *info,
struct demangle_component *ret_comp,
canonicalization_ftype *finder,
void *data)
{
int i;
char *name;
struct symbol *sym;
/* Copy the symbol's name from RET_COMP and look it up
in the symbol table. */
name = (char *) alloca (ret_comp->u.s_name.len + 1);
memcpy (name, ret_comp->u.s_name.s, ret_comp->u.s_name.len);
name[ret_comp->u.s_name.len] = '\0';
/* Ignore any typedefs that should not be substituted. */
for (i = 0; i < ARRAY_SIZE (ignore_typedefs); ++i)
{
if (strcmp (name, ignore_typedefs[i]) == 0)
return 0;
}
sym = NULL;
TRY
{
sym = lookup_symbol (name, 0, VAR_DOMAIN, 0).symbol;
}
CATCH (except, RETURN_MASK_ALL)
{
return 0;
}
END_CATCH
if (sym != NULL)
{
struct type *otype = SYMBOL_TYPE (sym);
if (finder != NULL)
{
const char *new_name = (*finder) (otype, data);
if (new_name != NULL)
{
ret_comp->u.s_name.s = new_name;
ret_comp->u.s_name.len = strlen (new_name);
return 1;
}
return 0;
}
/* If the type is a typedef or namespace alias, replace it. */
if (TYPE_CODE (otype) == TYPE_CODE_TYPEDEF
|| TYPE_CODE (otype) == TYPE_CODE_NAMESPACE)
{
long len;
int is_anon;
struct type *type;
struct demangle_parse_info *i;
struct ui_file *buf;
/* Get the real type of the typedef. */
type = check_typedef (otype);
/* If the symbol is a namespace and its type name is no different
than the name we looked up, this symbol is not a namespace
alias and does not need to be substituted. */
if (TYPE_CODE (otype) == TYPE_CODE_NAMESPACE
&& strcmp (TYPE_NAME (type), name) == 0)
return 0;
is_anon = (TYPE_TAG_NAME (type) == NULL
&& (TYPE_CODE (type) == TYPE_CODE_ENUM
|| TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION));
if (is_anon)
{
struct type *last = otype;
/* Find the last typedef for the type. */
while (TYPE_TARGET_TYPE (last) != NULL
&& (TYPE_CODE (TYPE_TARGET_TYPE (last))
== TYPE_CODE_TYPEDEF))
last = TYPE_TARGET_TYPE (last);
/* If there is only one typedef for this anonymous type,
do not substitute it. */
if (type == otype)
return 0;
else
/* Use the last typedef seen as the type for this
anonymous type. */
type = last;
}
buf = mem_fileopen ();
TRY
{
type_print (type, "", buf, -1);
}
/* If type_print threw an exception, there is little point
in continuing, so just bow out gracefully. */
CATCH (except, RETURN_MASK_ERROR)
{
ui_file_delete (buf);
return 0;
}
END_CATCH
name = ui_file_obsavestring (buf, &info->obstack, &len);
ui_file_delete (buf);
/* Turn the result into a new tree. Note that this
tree will contain pointers into NAME, so NAME cannot
be free'd until all typedef conversion is done and
the final result is converted into a string. */
i = cp_demangled_name_to_comp (name, NULL);
if (i != NULL)
{
/* Merge the two trees. */
cp_merge_demangle_parse_infos (info, ret_comp, i);
/* Replace any newly introduced typedefs -- but not
if the type is anonymous (that would lead to infinite
looping). */
if (!is_anon)
replace_typedefs (info, ret_comp, finder, data);
}
else
{
/* This shouldn't happen unless the type printer has
output something that the name parser cannot grok.
Nonetheless, an ounce of prevention...
Canonicalize the name again, and store it in the
current node (RET_COMP). */
char *canon = cp_canonicalize_string_no_typedefs (name);
if (canon != NULL)
{
/* Copy the canonicalization into the obstack and
free CANON. */
name = copy_string_to_obstack (&info->obstack, canon, &len);
xfree (canon);
}
ret_comp->u.s_name.s = name;
ret_comp->u.s_name.len = len;
}
return 1;
}
}
return 0;
}
/* Replace any typedefs appearing in the qualified name
(DEMANGLE_COMPONENT_QUAL_NAME) represented in RET_COMP for the name parse
given in INFO. */
static void
replace_typedefs_qualified_name (struct demangle_parse_info *info,
struct demangle_component *ret_comp,
canonicalization_ftype *finder,
void *data)
{
long len;
char *name;
struct ui_file *buf = mem_fileopen ();
struct demangle_component *comp = ret_comp;
/* Walk each node of the qualified name, reconstructing the name of
this element. With every node, check for any typedef substitutions.
If a substitution has occurred, replace the qualified name node
with a DEMANGLE_COMPONENT_NAME node representing the new, typedef-
substituted name. */
while (comp->type == DEMANGLE_COMPONENT_QUAL_NAME)
{
if (d_left (comp)->type == DEMANGLE_COMPONENT_NAME)
{
struct demangle_component newobj;
ui_file_write (buf, d_left (comp)->u.s_name.s,
d_left (comp)->u.s_name.len);
name = ui_file_obsavestring (buf, &info->obstack, &len);
newobj.type = DEMANGLE_COMPONENT_NAME;
newobj.u.s_name.s = name;
newobj.u.s_name.len = len;
if (inspect_type (info, &newobj, finder, data))
{
char *n, *s;
long slen;
/* A typedef was substituted in NEW. Convert it to a
string and replace the top DEMANGLE_COMPONENT_QUAL_NAME
node. */
ui_file_rewind (buf);
n = cp_comp_to_string (&newobj, 100);
if (n == NULL)
{
/* If something went astray, abort typedef substitutions. */
ui_file_delete (buf);
return;
}
s = copy_string_to_obstack (&info->obstack, n, &slen);
xfree (n);
d_left (ret_comp)->type = DEMANGLE_COMPONENT_NAME;
d_left (ret_comp)->u.s_name.s = s;
d_left (ret_comp)->u.s_name.len = slen;
d_right (ret_comp) = d_right (comp);
comp = ret_comp;
continue;
}
}
else
{
/* The current node is not a name, so simply replace any
typedefs in it. Then print it to the stream to continue
checking for more typedefs in the tree. */
replace_typedefs (info, d_left (comp), finder, data);
name = cp_comp_to_string (d_left (comp), 100);
if (name == NULL)
{
/* If something went astray, abort typedef substitutions. */
ui_file_delete (buf);
return;
}
fputs_unfiltered (name, buf);
xfree (name);
}
ui_file_write (buf, "::", 2);
comp = d_right (comp);
}
/* If the next component is DEMANGLE_COMPONENT_NAME, save the qualified
name assembled above and append the name given by COMP. Then use this
reassembled name to check for a typedef. */
if (comp->type == DEMANGLE_COMPONENT_NAME)
{
ui_file_write (buf, comp->u.s_name.s, comp->u.s_name.len);
name = ui_file_obsavestring (buf, &info->obstack, &len);
/* Replace the top (DEMANGLE_COMPONENT_QUAL_NAME) node
with a DEMANGLE_COMPONENT_NAME node containing the whole
name. */
ret_comp->type = DEMANGLE_COMPONENT_NAME;
ret_comp->u.s_name.s = name;
ret_comp->u.s_name.len = len;
inspect_type (info, ret_comp, finder, data);
}
else
replace_typedefs (info, comp, finder, data);
ui_file_delete (buf);
}
/* A function to check const and volatile qualifiers for argument types.
"Parameter declarations that differ only in the presence
or absence of `const' and/or `volatile' are equivalent."
C++ Standard N3290, clause 13.1.3 #4. */
static void
check_cv_qualifiers (struct demangle_component *ret_comp)
{
while (d_left (ret_comp) != NULL
&& (d_left (ret_comp)->type == DEMANGLE_COMPONENT_CONST
|| d_left (ret_comp)->type == DEMANGLE_COMPONENT_VOLATILE))
{
d_left (ret_comp) = d_left (d_left (ret_comp));
}
}
/* Walk the parse tree given by RET_COMP, replacing any typedefs with
their basic types. */
static void
replace_typedefs (struct demangle_parse_info *info,
struct demangle_component *ret_comp,
canonicalization_ftype *finder,
void *data)
{
if (ret_comp)
{
if (finder != NULL
&& (ret_comp->type == DEMANGLE_COMPONENT_NAME
|| ret_comp->type == DEMANGLE_COMPONENT_QUAL_NAME
|| ret_comp->type == DEMANGLE_COMPONENT_TEMPLATE
|| ret_comp->type == DEMANGLE_COMPONENT_BUILTIN_TYPE))
{
char *local_name = cp_comp_to_string (ret_comp, 10);
if (local_name != NULL)
{
struct symbol *sym = NULL;
sym = NULL;
TRY
{
sym = lookup_symbol (local_name, 0, VAR_DOMAIN, 0).symbol;
}
CATCH (except, RETURN_MASK_ALL)
{
}
END_CATCH
xfree (local_name);
if (sym != NULL)
{
struct type *otype = SYMBOL_TYPE (sym);
const char *new_name = (*finder) (otype, data);
if (new_name != NULL)
{
ret_comp->type = DEMANGLE_COMPONENT_NAME;
ret_comp->u.s_name.s = new_name;
ret_comp->u.s_name.len = strlen (new_name);
return;
}
}
}
}
switch (ret_comp->type)
{
case DEMANGLE_COMPONENT_ARGLIST:
check_cv_qualifiers (ret_comp);
/* Fall through */
case DEMANGLE_COMPONENT_FUNCTION_TYPE:
case DEMANGLE_COMPONENT_TEMPLATE:
case DEMANGLE_COMPONENT_TEMPLATE_ARGLIST:
case DEMANGLE_COMPONENT_TYPED_NAME:
replace_typedefs (info, d_left (ret_comp), finder, data);
replace_typedefs (info, d_right (ret_comp), finder, data);
break;
case DEMANGLE_COMPONENT_NAME:
inspect_type (info, ret_comp, finder, data);
break;
case DEMANGLE_COMPONENT_QUAL_NAME:
replace_typedefs_qualified_name (info, ret_comp, finder, data);
break;
case DEMANGLE_COMPONENT_LOCAL_NAME:
case DEMANGLE_COMPONENT_CTOR:
case DEMANGLE_COMPONENT_ARRAY_TYPE:
case DEMANGLE_COMPONENT_PTRMEM_TYPE:
replace_typedefs (info, d_right (ret_comp), finder, data);
break;
case DEMANGLE_COMPONENT_CONST:
case DEMANGLE_COMPONENT_RESTRICT:
case DEMANGLE_COMPONENT_VOLATILE:
case DEMANGLE_COMPONENT_VOLATILE_THIS:
case DEMANGLE_COMPONENT_CONST_THIS:
case DEMANGLE_COMPONENT_RESTRICT_THIS:
case DEMANGLE_COMPONENT_POINTER:
case DEMANGLE_COMPONENT_REFERENCE:
replace_typedefs (info, d_left (ret_comp), finder, data);
break;
default:
break;
}
}
}
/* Parse STRING and convert it to canonical form, resolving any typedefs.
If parsing fails, or if STRING is already canonical, return NULL.
Otherwise return the canonical form. The return value is allocated via
xmalloc. If FINDER is not NULL, then type components are passed to
FINDER to be looked up. DATA is passed verbatim to FINDER. */
char *
cp_canonicalize_string_full (const char *string,
canonicalization_ftype *finder,
void *data)
{
char *ret;
unsigned int estimated_len;
struct demangle_parse_info *info;
ret = NULL;
estimated_len = strlen (string) * 2;
info = cp_demangled_name_to_comp (string, NULL);
if (info != NULL)
{
/* Replace all the typedefs in the tree. */
replace_typedefs (info, info->tree, finder, data);
/* Convert the tree back into a string. */
ret = cp_comp_to_string (info->tree, estimated_len);
gdb_assert (ret != NULL);
/* Free the parse information. */
cp_demangled_name_parse_free (info);
/* Finally, compare the original string with the computed
name, returning NULL if they are the same. */
if (strcmp (string, ret) == 0)
{
xfree (ret);
return NULL;
}
}
return ret;
}
/* Like cp_canonicalize_string_full, but always passes NULL for
FINDER. */
char *
cp_canonicalize_string_no_typedefs (const char *string)
{
return cp_canonicalize_string_full (string, NULL, NULL);
}
/* Parse STRING and convert it to canonical form. If parsing fails,
or if STRING is already canonical, return NULL. Otherwise return
the canonical form. The return value is allocated via xmalloc. */
char *
cp_canonicalize_string (const char *string)
{
struct demangle_parse_info *info;
unsigned int estimated_len;
char *ret;
if (cp_already_canonical (string))
return NULL;
info = cp_demangled_name_to_comp (string, NULL);
if (info == NULL)
return NULL;
estimated_len = strlen (string) * 2;
ret = cp_comp_to_string (info->tree, estimated_len);
cp_demangled_name_parse_free (info);
if (ret == NULL)
{
warning (_("internal error: string \"%s\" failed to be canonicalized"),
string);
return NULL;
}
if (strcmp (string, ret) == 0)
{
xfree (ret);
return NULL;
}
return ret;
}
/* Convert a mangled name to a demangle_component tree. *MEMORY is
set to the block of used memory that should be freed when finished
with the tree. DEMANGLED_P is set to the char * that should be
freed when finished with the tree, or NULL if none was needed.
OPTIONS will be passed to the demangler. */
static struct demangle_parse_info *
mangled_name_to_comp (const char *mangled_name, int options,
void **memory, char **demangled_p)
{
char *demangled_name;
struct demangle_parse_info *info;
/* If it looks like a v3 mangled name, then try to go directly
to trees. */
if (mangled_name[0] == '_' && mangled_name[1] == 'Z')
{
struct demangle_component *ret;
ret = cplus_demangle_v3_components (mangled_name,
options, memory);
if (ret)
{
info = cp_new_demangle_parse_info ();
info->tree = ret;
*demangled_p = NULL;
return info;
}
}
/* If it doesn't, or if that failed, then try to demangle the
name. */
demangled_name = gdb_demangle (mangled_name, options);
if (demangled_name == NULL)
return NULL;
/* If we could demangle the name, parse it to build the component
tree. */
info = cp_demangled_name_to_comp (demangled_name, NULL);
if (info == NULL)
{
xfree (demangled_name);
return NULL;
}
*demangled_p = demangled_name;
return info;
}
/* Return the name of the class containing method PHYSNAME. */
char *
cp_class_name_from_physname (const char *physname)
{
void *storage = NULL;
char *demangled_name = NULL, *ret;
struct demangle_component *ret_comp, *prev_comp, *cur_comp;
struct demangle_parse_info *info;
int done;
info = mangled_name_to_comp (physname, DMGL_ANSI,
&storage, &demangled_name);
if (info == NULL)
return NULL;
done = 0;
ret_comp = info->tree;
/* First strip off any qualifiers, if we have a function or
method. */
while (!done)
switch (ret_comp->type)
{
case DEMANGLE_COMPONENT_CONST:
case DEMANGLE_COMPONENT_RESTRICT:
case DEMANGLE_COMPONENT_VOLATILE:
case DEMANGLE_COMPONENT_CONST_THIS:
case DEMANGLE_COMPONENT_RESTRICT_THIS:
case DEMANGLE_COMPONENT_VOLATILE_THIS:
case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
ret_comp = d_left (ret_comp);
break;
default:
done = 1;
break;
}
/* If what we have now is a function, discard the argument list. */
if (ret_comp->type == DEMANGLE_COMPONENT_TYPED_NAME)
ret_comp = d_left (ret_comp);
/* If what we have now is a template, strip off the template
arguments. The left subtree may be a qualified name. */
if (ret_comp->type == DEMANGLE_COMPONENT_TEMPLATE)
ret_comp = d_left (ret_comp);
/* What we have now should be a name, possibly qualified.
Additional qualifiers could live in the left subtree or the right
subtree. Find the last piece. */
done = 0;
prev_comp = NULL;
cur_comp = ret_comp;
while (!done)
switch (cur_comp->type)
{
case DEMANGLE_COMPONENT_QUAL_NAME:
case DEMANGLE_COMPONENT_LOCAL_NAME:
prev_comp = cur_comp;
cur_comp = d_right (cur_comp);
break;
case DEMANGLE_COMPONENT_TEMPLATE:
case DEMANGLE_COMPONENT_NAME:
case DEMANGLE_COMPONENT_CTOR:
case DEMANGLE_COMPONENT_DTOR:
case DEMANGLE_COMPONENT_OPERATOR:
case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
done = 1;
break;
default:
done = 1;
cur_comp = NULL;
break;
}
ret = NULL;
if (cur_comp != NULL && prev_comp != NULL)
{
/* We want to discard the rightmost child of PREV_COMP. */
*prev_comp = *d_left (prev_comp);
/* The ten is completely arbitrary; we don't have a good
estimate. */
ret = cp_comp_to_string (ret_comp, 10);
}
xfree (storage);
xfree (demangled_name);
cp_demangled_name_parse_free (info);
return ret;
}
/* Return the child of COMP which is the basename of a method,
variable, et cetera. All scope qualifiers are discarded, but
template arguments will be included. The component tree may be
modified. */
static struct demangle_component *
unqualified_name_from_comp (struct demangle_component *comp)
{
struct demangle_component *ret_comp = comp, *last_template;
int done;
done = 0;
last_template = NULL;
while (!done)
switch (ret_comp->type)
{
case DEMANGLE_COMPONENT_QUAL_NAME:
case DEMANGLE_COMPONENT_LOCAL_NAME:
ret_comp = d_right (ret_comp);
break;
case DEMANGLE_COMPONENT_TYPED_NAME:
ret_comp = d_left (ret_comp);
break;
case DEMANGLE_COMPONENT_TEMPLATE:
gdb_assert (last_template == NULL);
last_template = ret_comp;
ret_comp = d_left (ret_comp);
break;
case DEMANGLE_COMPONENT_CONST:
case DEMANGLE_COMPONENT_RESTRICT:
case DEMANGLE_COMPONENT_VOLATILE:
case DEMANGLE_COMPONENT_CONST_THIS:
case DEMANGLE_COMPONENT_RESTRICT_THIS:
case DEMANGLE_COMPONENT_VOLATILE_THIS:
case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
ret_comp = d_left (ret_comp);
break;
case DEMANGLE_COMPONENT_NAME:
case DEMANGLE_COMPONENT_CTOR:
case DEMANGLE_COMPONENT_DTOR:
case DEMANGLE_COMPONENT_OPERATOR:
case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
done = 1;
break;
default:
return NULL;
break;
}
if (last_template)
{
d_left (last_template) = ret_comp;
return last_template;
}
return ret_comp;
}
/* Return the name of the method whose linkage name is PHYSNAME. */
char *
method_name_from_physname (const char *physname)
{
void *storage = NULL;
char *demangled_name = NULL, *ret;
struct demangle_component *ret_comp;
struct demangle_parse_info *info;
info = mangled_name_to_comp (physname, DMGL_ANSI,
&storage, &demangled_name);
if (info == NULL)
return NULL;
ret_comp = unqualified_name_from_comp (info->tree);
ret = NULL;
if (ret_comp != NULL)
/* The ten is completely arbitrary; we don't have a good
estimate. */
ret = cp_comp_to_string (ret_comp, 10);
xfree (storage);
xfree (demangled_name);
cp_demangled_name_parse_free (info);
return ret;
}
/* If FULL_NAME is the demangled name of a C++ function (including an
arg list, possibly including namespace/class qualifications),
return a new string containing only the function name (without the
arg list/class qualifications). Otherwise, return NULL. The
caller is responsible for freeing the memory in question. */
char *
cp_func_name (const char *full_name)
{
char *ret;
struct demangle_component *ret_comp;
struct demangle_parse_info *info;
info = cp_demangled_name_to_comp (full_name, NULL);
if (!info)
return NULL;
ret_comp = unqualified_name_from_comp (info->tree);
ret = NULL;
if (ret_comp != NULL)
ret = cp_comp_to_string (ret_comp, 10);
cp_demangled_name_parse_free (info);
return ret;
}
/* DEMANGLED_NAME is the name of a function, including parameters and
(optionally) a return type. Return the name of the function without
parameters or return type, or NULL if we can not parse the name. */
char *
cp_remove_params (const char *demangled_name)
{
int done = 0;
struct demangle_component *ret_comp;
struct demangle_parse_info *info;
char *ret = NULL;
if (demangled_name == NULL)
return NULL;
info = cp_demangled_name_to_comp (demangled_name, NULL);
if (info == NULL)
return NULL;
/* First strip off any qualifiers, if we have a function or method. */
ret_comp = info->tree;
while (!done)
switch (ret_comp->type)
{
case DEMANGLE_COMPONENT_CONST:
case DEMANGLE_COMPONENT_RESTRICT:
case DEMANGLE_COMPONENT_VOLATILE:
case DEMANGLE_COMPONENT_CONST_THIS:
case DEMANGLE_COMPONENT_RESTRICT_THIS:
case DEMANGLE_COMPONENT_VOLATILE_THIS:
case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
ret_comp = d_left (ret_comp);
break;
default:
done = 1;
break;
}
/* What we have now should be a function. Return its name. */
if (ret_comp->type == DEMANGLE_COMPONENT_TYPED_NAME)
ret = cp_comp_to_string (d_left (ret_comp), 10);
cp_demangled_name_parse_free (info);
return ret;
}
/* Here are some random pieces of trivia to keep in mind while trying
to take apart demangled names:
- Names can contain function arguments or templates, so the process
has to be, to some extent recursive: maybe keep track of your
depth based on encountering <> and ().
- Parentheses don't just have to happen at the end of a name: they
can occur even if the name in question isn't a function, because
a template argument might be a type that's a function.
- Conversely, even if you're trying to deal with a function, its
demangled name might not end with ')': it could be a const or
volatile class method, in which case it ends with "const" or
"volatile".
- Parentheses are also used in anonymous namespaces: a variable
'foo' in an anonymous namespace gets demangled as "(anonymous
namespace)::foo".
- And operator names can contain parentheses or angle brackets. */
/* FIXME: carlton/2003-03-13: We have several functions here with
overlapping functionality; can we combine them? Also, do they
handle all the above considerations correctly? */
/* This returns the length of first component of NAME, which should be
the demangled name of a C++ variable/function/method/etc.
Specifically, it returns the index of the first colon forming the
boundary of the first component: so, given 'A::foo' or 'A::B::foo'
it returns the 1, and given 'foo', it returns 0. */
/* The character in NAME indexed by the return value is guaranteed to
always be either ':' or '\0'. */
/* NOTE: carlton/2003-03-13: This function is currently only intended
for internal use: it's probably not entirely safe when called on
user-generated input, because some of the 'index += 2' lines in
cp_find_first_component_aux might go past the end of malformed
input. */
unsigned int
cp_find_first_component (const char *name)
{
return cp_find_first_component_aux (name, 0);
}
/* Helper function for cp_find_first_component. Like that function,
it returns the length of the first component of NAME, but to make
the recursion easier, it also stops if it reaches an unexpected ')'
or '>' if the value of PERMISSIVE is nonzero. */
/* Let's optimize away calls to strlen("operator"). */
#define LENGTH_OF_OPERATOR 8
static unsigned int
cp_find_first_component_aux (const char *name, int permissive)
{
unsigned int index = 0;
/* Operator names can show up in unexpected places. Since these can
contain parentheses or angle brackets, they can screw up the
recursion. But not every string 'operator' is part of an
operater name: e.g. you could have a variable 'cooperator'. So
this variable tells us whether or not we should treat the string
'operator' as starting an operator. */
int operator_possible = 1;
for (;; ++index)
{
switch (name[index])
{
case '<':
/* Template; eat it up. The calls to cp_first_component
should only return (I hope!) when they reach the '>'
terminating the component or a '::' between two
components. (Hence the '+ 2'.) */
index += 1;