/* Implementation of the GDB variable objects API.
- Copyright (C) 1999-2020 Free Software Foundation, Inc.
+ Copyright (C) 1999-2022 Free Software Foundation, Inc.
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
#include "gdbcmd.h"
#include "block.h"
#include "valprint.h"
-#include "gdb_regex.h"
+#include "gdbsupport/gdb_regex.h"
#include "varobj.h"
#include "gdbthread.h"
#include "varobj-iter.h"
#include "parser-defs.h"
#include "gdbarch.h"
+#include <algorithm>
#if HAVE_PYTHON
#include "python/python.h"
/* The varobj for this root node. */
struct varobj *rootvar = NULL;
-
- /* Next root variable */
- struct varobj_root *next = NULL;
};
/* Dynamic part of varobj. */
/* The iterator returned by the printer's 'children' method, or NULL
if not available. */
- struct varobj_iter *child_iter = NULL;
+ std::unique_ptr<varobj_iter> child_iter;
/* We request one extra item from the iterator, so that we can
report to the caller whether there are more items than we have
already reported. However, we don't want to install this value
when we read it, because that will mess up future updates. So,
we stash it here instead. */
- varobj_item *saved_item = NULL;
-};
-
-/* A list of varobjs */
-
-struct vlist
-{
- struct varobj *var;
- struct vlist *next;
+ std::unique_ptr<varobj_item> saved_item;
};
/* Private function prototypes */
static void delete_variable_1 (int *, struct varobj *, bool, bool);
-static bool install_variable (struct varobj *);
+static void install_variable (struct varobj *);
static void uninstall_variable (struct varobj *);
/* Mappings of varobj_display_formats enums to gdb's format codes. */
static int format_code[] = { 0, 't', 'd', 'x', 'o', 'z' };
-/* Header of the list of root variable objects. */
-static struct varobj_root *rootlist;
-
-/* Prime number indicating the number of buckets in the hash table. */
-/* A prime large enough to avoid too many collisions. */
-#define VAROBJ_TABLE_SIZE 227
+/* List of root variable objects. */
+static std::list<struct varobj_root *> rootlist;
/* Pointer to the varobj hash table (built at run time). */
-static struct vlist **varobj_table;
+static htab_t varobj_table;
\f
}
/* Don't allow variables to be created for types. */
- if (var->root->exp->elts[0].opcode == OP_TYPE
- || var->root->exp->elts[0].opcode == OP_TYPEOF
- || var->root->exp->elts[0].opcode == OP_DECLTYPE)
+ enum exp_opcode opcode = var->root->exp->first_opcode ();
+ if (opcode == OP_TYPE
+ || opcode == OP_TYPEOF
+ || opcode == OP_DECLTYPE)
{
fprintf_unfiltered (gdb_stderr, "Attempt to use a type name"
" as an expression.\n");
if ((var != NULL) && (objname != NULL))
{
var->obj_name = objname;
-
- /* If a varobj name is duplicated, the install will fail so
- we must cleanup. */
- if (!install_variable (var.get ()))
- return NULL;
+ install_variable (var.get ());
}
return var.release ();
struct varobj *
varobj_get_handle (const char *objname)
{
- struct vlist *cv;
- const char *chp;
- unsigned int index = 0;
- unsigned int i = 1;
+ varobj *var = (varobj *) htab_find_with_hash (varobj_table, objname,
+ htab_hash_string (objname));
- for (chp = objname; *chp; chp++)
- {
- index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE;
- }
-
- cv = *(varobj_table + index);
- while (cv != NULL && cv->var->obj_name != objname)
- cv = cv->next;
-
- if (cv == NULL)
+ if (var == NULL)
error (_("Variable object not found"));
- return cv->var;
+ return var;
}
/* Given the handle, return the name of the object. */
static PyObject *
instantiate_pretty_printer (PyObject *constructor, struct value *value)
{
- PyObject *val_obj = NULL;
- PyObject *printer;
-
- val_obj = value_to_value_object (value);
- if (! val_obj)
+ gdbpy_ref<> val_obj (value_to_value_object (value));
+ if (val_obj == nullptr)
return NULL;
- printer = PyObject_CallFunctionObjArgs (constructor, val_obj, NULL);
- Py_DECREF (val_obj);
- return printer;
+ return PyObject_CallFunctionObjArgs (constructor, val_obj.get (), NULL);
}
#endif
else
{
varobj *existing = var->children[index];
- bool type_updated = update_type_if_necessary (existing, item->value);
+ bool type_updated = update_type_if_necessary (existing,
+ item->value.get ());
if (type_updated)
{
if (type_changed != NULL)
type_changed->push_back (existing);
}
- if (install_new_value (existing, item->value, 0))
+ if (install_new_value (existing, item->value.get (), 0))
{
if (!type_updated && changed != NULL)
changed->push_back (existing);
/* A factory for creating dynamic varobj's iterators. Returns an
iterator object suitable for iterating over VAR's children. */
-static struct varobj_iter *
+static std::unique_ptr<varobj_iter>
varobj_get_iterator (struct varobj *var)
{
#if HAVE_PYTHON
return py_varobj_get_iterator (var, var->dynamic->pretty_printer);
#endif
- gdb_assert_not_reached (_("\
-requested an iterator from a non-dynamic varobj"));
-}
-
-/* Release and clear VAR's saved item, if any. */
-
-static void
-varobj_clear_saved_item (struct varobj_dynamic *var)
-{
- if (var->saved_item != NULL)
- {
- value_decref (var->saved_item->value);
- delete var->saved_item;
- var->saved_item = NULL;
- }
+ gdb_assert_not_reached ("requested an iterator from a non-dynamic varobj");
}
static bool
if (update_children || var->dynamic->child_iter == NULL)
{
- varobj_iter_delete (var->dynamic->child_iter);
var->dynamic->child_iter = varobj_get_iterator (var);
-
- varobj_clear_saved_item (var->dynamic);
+ var->dynamic->saved_item.reset (nullptr);
i = 0;
are more children. */
for (; to < 0 || i < to + 1; ++i)
{
- varobj_item *item;
+ std::unique_ptr<varobj_item> item;
/* See if there was a leftover from last time. */
if (var->dynamic->saved_item != NULL)
- {
- item = var->dynamic->saved_item;
- var->dynamic->saved_item = NULL;
- }
+ item = std::move (var->dynamic->saved_item);
else
- {
- item = varobj_iter_next (var->dynamic->child_iter);
- /* Release vitem->value so its lifetime is not bound to the
- execution of a command. */
- if (item != NULL && item->value != NULL)
- item->value = release_value (item->value).release ();
- }
+ item = var->dynamic->child_iter->next ();
if (item == NULL)
{
/* Iteration is done. Remove iterator from VAR. */
- varobj_iter_delete (var->dynamic->child_iter);
- var->dynamic->child_iter = NULL;
+ var->dynamic->child_iter.reset (nullptr);
break;
}
/* We don't want to push the extra child on any report list. */
can_mention ? newobj : NULL,
can_mention ? unchanged : NULL,
can_mention ? cchanged : NULL, i,
- item);
-
- delete item;
+ item.get ());
}
else
{
- var->dynamic->saved_item = item;
+ var->dynamic->saved_item = std::move (item);
/* We want to truncate the child list just before this
element. */
Py_XDECREF (var->pretty_printer);
var->pretty_printer = visualizer;
- varobj_iter_delete (var->child_iter);
- var->child_iter = NULL;
+ var->child_iter.reset (nullptr);
}
/* Install the default visualizer for VAR. */
}
/* Install the given variable VAR with the object name VAR->OBJ_NAME. */
-static bool
+static void
install_variable (struct varobj *var)
{
- struct vlist *cv;
- struct vlist *newvl;
- const char *chp;
- unsigned int index = 0;
- unsigned int i = 1;
-
- for (chp = var->obj_name.c_str (); *chp; chp++)
- {
- index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE;
- }
-
- cv = *(varobj_table + index);
- while (cv != NULL && cv->var->obj_name != var->obj_name)
- cv = cv->next;
-
- if (cv != NULL)
+ hashval_t hash = htab_hash_string (var->obj_name.c_str ());
+ void **slot = htab_find_slot_with_hash (varobj_table,
+ var->obj_name.c_str (),
+ hash, INSERT);
+ if (*slot != nullptr)
error (_("Duplicate variable object name"));
/* Add varobj to hash table. */
- newvl = XNEW (struct vlist);
- newvl->next = *(varobj_table + index);
- newvl->var = var;
- *(varobj_table + index) = newvl;
+ *slot = var;
/* If root, add varobj to root list. */
if (is_root_p (var))
- {
- /* Add to list of root variables. */
- if (rootlist == NULL)
- var->root->next = NULL;
- else
- var->root->next = rootlist;
- rootlist = var->root;
- }
-
- return true; /* OK */
+ rootlist.push_front (var->root);
}
/* Uninstall the object VAR. */
static void
uninstall_variable (struct varobj *var)
{
- struct vlist *cv;
- struct vlist *prev;
- struct varobj_root *cr;
- struct varobj_root *prer;
- const char *chp;
- unsigned int index = 0;
- unsigned int i = 1;
-
- /* Remove varobj from hash table. */
- for (chp = var->obj_name.c_str (); *chp; chp++)
- {
- index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE;
- }
-
- cv = *(varobj_table + index);
- prev = NULL;
- while (cv != NULL && cv->var->obj_name != var->obj_name)
- {
- prev = cv;
- cv = cv->next;
- }
+ hashval_t hash = htab_hash_string (var->obj_name.c_str ());
+ htab_remove_elt_with_hash (varobj_table, var->obj_name.c_str (), hash);
if (varobjdebug)
fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name.c_str ());
- if (cv == NULL)
- {
- warning
- ("Assertion failed: Could not find variable object \"%s\" to delete",
- var->obj_name.c_str ());
- return;
- }
-
- if (prev == NULL)
- *(varobj_table + index) = cv->next;
- else
- prev->next = cv->next;
-
- xfree (cv);
-
/* If root, remove varobj from root list. */
if (is_root_p (var))
{
- /* Remove from list of root variables. */
- if (rootlist == var->root)
- rootlist = var->root->next;
- else
- {
- prer = NULL;
- cr = rootlist;
- while ((cr != NULL) && (cr->rootvar != var))
- {
- prer = cr;
- cr = cr->next;
- }
- if (cr == NULL)
- {
- warning (_("Assertion failed: Could not find "
- "varobj \"%s\" in root list"),
- var->obj_name.c_str ());
- return;
- }
- if (prer == NULL)
- rootlist = NULL;
- else
- prer->next = cr->next;
- }
+ auto iter = std::find (rootlist.begin (), rootlist.end (), var->root);
+ rootlist.erase (iter);
}
-
}
/* Create and install a child of the parent of the given name.
struct varobj_item item;
std::swap (item.name, name);
- item.value = value_of_child (parent, index);
+ item.value = release_value (value_of_child (parent, index));
return create_child_with_value (parent, index, &item);
}
if (item->value != NULL)
/* If the child had no evaluation errors, var->value
will be non-NULL and contain a valid type. */
- child->type = value_actual_type (item->value, 0, NULL);
+ child->type = value_actual_type (item->value.get (), 0, NULL);
else
/* Otherwise, we must compute the type. */
child->type = (*child->root->lang_ops->type_of_child) (child->parent,
child->index);
- install_new_value (child, item->value, 1);
+ install_new_value (child, item->value.get (), 1);
return child;
}
}
#endif
- varobj_iter_delete (var->dynamic->child_iter);
- varobj_clear_saved_item (var->dynamic);
+ /* This must be deleted before the root object, because Python-based
+ destructors need access to some components. */
+ delete var->dynamic;
if (is_root_p (var))
delete var->root;
-
- delete var->dynamic;
}
/* Return the type of the value that's stored in VAR,
thevalue = std::string (s.get ());
len = thevalue.size ();
- gdbarch = get_type_arch (value_type (value));
+ gdbarch = value_type (value)->arch ();
type = builtin_type (gdbarch)->builtin_char;
if (!string_print)
/* If the THEVALUE has contents, it is a regular string. */
if (!thevalue.empty ())
- LA_PRINT_STRING (&stb, type, (gdb_byte *) thevalue.c_str (),
- len, encoding.get (), 0, &opts);
+ current_language->printstr (&stb, type, (gdb_byte *) thevalue.c_str (),
+ len, encoding.get (), 0, &opts);
else if (string_print)
/* Otherwise, if string_print is set, and it is not a regular
string, it is a lazy string. */
/* All other cases. */
common_val_print (value, &stb, 0, &opts, current_language);
- return std::move (stb.string ());
+ return stb.release ();
}
bool
return r;
}
-/* Iterate all the existing _root_ VAROBJs and call the FUNC callback for them
- with an arbitrary caller supplied DATA pointer. */
+/* Iterate all the existing _root_ VAROBJs and call the FUNC callback
+ for each one. */
void
-all_root_varobjs (void (*func) (struct varobj *var, void *data), void *data)
+all_root_varobjs (gdb::function_view<void (struct varobj *var)> func)
{
- struct varobj_root *var_root, *var_root_next;
-
/* Iterate "safely" - handle if the callee deletes its passed VAROBJ. */
-
- for (var_root = rootlist; var_root != NULL; var_root = var_root_next)
+ auto iter = rootlist.begin ();
+ auto end = rootlist.end ();
+ while (iter != end)
{
- var_root_next = var_root->next;
-
- (*func) (var_root->rootvar, data);
+ auto self = iter++;
+ func ((*self)->rootvar);
}
}
varobj must be either re-evaluated, or marked as invalid here. */
static void
-varobj_invalidate_iter (struct varobj *var, void *unused)
+varobj_invalidate_iter (struct varobj *var)
{
/* global and floating var must be re-evaluated. */
if (var->root->floating || var->root->valid_block == NULL)
void
varobj_invalidate (void)
{
- all_root_varobjs (varobj_invalidate_iter, NULL);
+ all_root_varobjs (varobj_invalidate_iter);
+}
+
+/* A hash function for a varobj. */
+
+static hashval_t
+hash_varobj (const void *a)
+{
+ const varobj *obj = (const varobj *) a;
+ return htab_hash_string (obj->obj_name.c_str ());
+}
+
+/* A hash table equality function for varobjs. */
+
+static int
+eq_varobj_and_string (const void *a, const void *b)
+{
+ const varobj *obj = (const varobj *) a;
+ const char *name = (const char *) b;
+
+ return obj->obj_name == name;
}
void _initialize_varobj ();
void
_initialize_varobj ()
{
- varobj_table = XCNEWVEC (struct vlist *, VAROBJ_TABLE_SIZE);
+ varobj_table = htab_create_alloc (5, hash_varobj, eq_varobj_and_string,
+ nullptr, xcalloc, xfree);
add_setshow_zuinteger_cmd ("varobj", class_maintenance,
&varobjdebug,
projects / binutils-gdb.git / blobdiff