| /* Implementation of the GDB variable objects API. |
| |
| Copyright (C) 1999-2014 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 |
| 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 "exceptions.h" |
| #include "value.h" |
| #include "expression.h" |
| #include "frame.h" |
| #include "language.h" |
| #include "gdbcmd.h" |
| #include "block.h" |
| #include "valprint.h" |
| |
| #include "gdb_assert.h" |
| #include <string.h> |
| #include "gdb_regex.h" |
| |
| #include "varobj.h" |
| #include "vec.h" |
| #include "gdbthread.h" |
| #include "inferior.h" |
| |
| #if HAVE_PYTHON |
| #include "python/python.h" |
| #include "python/python-internal.h" |
| #else |
| typedef int PyObject; |
| #endif |
| |
| /* Non-zero if we want to see trace of varobj level stuff. */ |
| |
| unsigned int varobjdebug = 0; |
| static void |
| show_varobjdebug (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| fprintf_filtered (file, _("Varobj debugging is %s.\n"), value); |
| } |
| |
| /* String representations of gdb's format codes. */ |
| char *varobj_format_string[] = |
| { "natural", "binary", "decimal", "hexadecimal", "octal" }; |
| |
| /* True if we want to allow Python-based pretty-printing. */ |
| static int pretty_printing = 0; |
| |
| void |
| varobj_enable_pretty_printing (void) |
| { |
| pretty_printing = 1; |
| } |
| |
| /* Data structures */ |
| |
| /* Every root variable has one of these structures saved in its |
| varobj. Members which must be free'd are noted. */ |
| struct varobj_root |
| { |
| |
| /* Alloc'd expression for this parent. */ |
| struct expression *exp; |
| |
| /* Block for which this expression is valid. */ |
| const struct block *valid_block; |
| |
| /* The frame for this expression. This field is set iff valid_block is |
| not NULL. */ |
| struct frame_id frame; |
| |
| /* The thread ID that this varobj_root belong to. This field |
| is only valid if valid_block is not NULL. |
| When not 0, indicates which thread 'frame' belongs to. |
| When 0, indicates that the thread list was empty when the varobj_root |
| was created. */ |
| int thread_id; |
| |
| /* If 1, the -var-update always recomputes the value in the |
| current thread and frame. Otherwise, variable object is |
| always updated in the specific scope/thread/frame. */ |
| int floating; |
| |
| /* Flag that indicates validity: set to 0 when this varobj_root refers |
| to symbols that do not exist anymore. */ |
| int is_valid; |
| |
| /* Language-related operations for this variable and its |
| children. */ |
| const struct lang_varobj_ops *lang_ops; |
| |
| /* The varobj for this root node. */ |
| struct varobj *rootvar; |
| |
| /* Next root variable */ |
| struct varobj_root *next; |
| }; |
| |
| /* Dynamic part of varobj. */ |
| |
| struct varobj_dynamic |
| { |
| /* Whether the children of this varobj were requested. This field is |
| used to decide if dynamic varobj should recompute their children. |
| In the event that the frontend never asked for the children, we |
| can avoid that. */ |
| int children_requested; |
| |
| /* The pretty-printer constructor. If NULL, then the default |
| pretty-printer will be looked up. If None, then no |
| pretty-printer will be installed. */ |
| PyObject *constructor; |
| |
| /* The pretty-printer that has been constructed. If NULL, then a |
| new printer object is needed, and one will be constructed. */ |
| PyObject *pretty_printer; |
| |
| /* The iterator returned by the printer's 'children' method, or NULL |
| if not available. */ |
| PyObject *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. */ |
| PyObject *saved_item; |
| }; |
| |
| struct cpstack |
| { |
| char *name; |
| struct cpstack *next; |
| }; |
| |
| /* A list of varobjs */ |
| |
| struct vlist |
| { |
| struct varobj *var; |
| struct vlist *next; |
| }; |
| |
| /* Private function prototypes */ |
| |
| /* Helper functions for the above subcommands. */ |
| |
| static int delete_variable (struct cpstack **, struct varobj *, int); |
| |
| static void delete_variable_1 (struct cpstack **, int *, |
| struct varobj *, int, int); |
| |
| static int install_variable (struct varobj *); |
| |
| static void uninstall_variable (struct varobj *); |
| |
| static struct varobj *create_child (struct varobj *, int, char *); |
| |
| static struct varobj * |
| create_child_with_value (struct varobj *parent, int index, char *name, |
| struct value *value); |
| |
| /* Utility routines */ |
| |
| static struct varobj *new_variable (void); |
| |
| static struct varobj *new_root_variable (void); |
| |
| static void free_variable (struct varobj *var); |
| |
| static struct cleanup *make_cleanup_free_variable (struct varobj *var); |
| |
| static enum varobj_display_formats variable_default_display (struct varobj *); |
| |
| static void cppush (struct cpstack **pstack, char *name); |
| |
| static char *cppop (struct cpstack **pstack); |
| |
| static int update_type_if_necessary (struct varobj *var, |
| struct value *new_value); |
| |
| static int install_new_value (struct varobj *var, struct value *value, |
| int initial); |
| |
| /* Language-specific routines. */ |
| |
| static int number_of_children (struct varobj *); |
| |
| static char *name_of_variable (struct varobj *); |
| |
| static char *name_of_child (struct varobj *, int); |
| |
| static struct value *value_of_root (struct varobj **var_handle, int *); |
| |
| static struct value *value_of_child (struct varobj *parent, int index); |
| |
| static char *my_value_of_variable (struct varobj *var, |
| enum varobj_display_formats format); |
| |
| static int is_root_p (struct varobj *var); |
| |
| #if HAVE_PYTHON |
| |
| static struct varobj *varobj_add_child (struct varobj *var, |
| char *name, |
| struct value *value); |
| |
| #endif /* HAVE_PYTHON */ |
| |
| /* Private data */ |
| |
| /* Mappings of varobj_display_formats enums to gdb's format codes. */ |
| static int format_code[] = { 0, 't', 'd', 'x', 'o' }; |
| |
| /* 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 colisions. */ |
| #define VAROBJ_TABLE_SIZE 227 |
| |
| /* Pointer to the varobj hash table (built at run time). */ |
| static struct vlist **varobj_table; |
| |
| |
| |
| /* API Implementation */ |
| static int |
| is_root_p (struct varobj *var) |
| { |
| return (var->root->rootvar == var); |
| } |
| |
| #ifdef HAVE_PYTHON |
| /* Helper function to install a Python environment suitable for |
| use during operations on VAR. */ |
| static struct cleanup * |
| varobj_ensure_python_env (struct varobj *var) |
| { |
| return ensure_python_env (var->root->exp->gdbarch, |
| var->root->exp->language_defn); |
| } |
| #endif |
| |
| /* Creates a varobj (not its children). */ |
| |
| /* Return the full FRAME which corresponds to the given CORE_ADDR |
| or NULL if no FRAME on the chain corresponds to CORE_ADDR. */ |
| |
| static struct frame_info * |
| find_frame_addr_in_frame_chain (CORE_ADDR frame_addr) |
| { |
| struct frame_info *frame = NULL; |
| |
| if (frame_addr == (CORE_ADDR) 0) |
| return NULL; |
| |
| for (frame = get_current_frame (); |
| frame != NULL; |
| frame = get_prev_frame (frame)) |
| { |
| /* The CORE_ADDR we get as argument was parsed from a string GDB |
| output as $fp. This output got truncated to gdbarch_addr_bit. |
| Truncate the frame base address in the same manner before |
| comparing it against our argument. */ |
| CORE_ADDR frame_base = get_frame_base_address (frame); |
| int addr_bit = gdbarch_addr_bit (get_frame_arch (frame)); |
| |
| if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
| frame_base &= ((CORE_ADDR) 1 << addr_bit) - 1; |
| |
| if (frame_base == frame_addr) |
| return frame; |
| } |
| |
| return NULL; |
| } |
| |
| struct varobj * |
| varobj_create (char *objname, |
| char *expression, CORE_ADDR frame, enum varobj_type type) |
| { |
| struct varobj *var; |
| struct cleanup *old_chain; |
| |
| /* Fill out a varobj structure for the (root) variable being constructed. */ |
| var = new_root_variable (); |
| old_chain = make_cleanup_free_variable (var); |
| |
| if (expression != NULL) |
| { |
| struct frame_info *fi; |
| struct frame_id old_id = null_frame_id; |
| struct block *block; |
| const char *p; |
| struct value *value = NULL; |
| volatile struct gdb_exception except; |
| CORE_ADDR pc; |
| |
| /* Parse and evaluate the expression, filling in as much of the |
| variable's data as possible. */ |
| |
| if (has_stack_frames ()) |
| { |
| /* Allow creator to specify context of variable. */ |
| if ((type == USE_CURRENT_FRAME) || (type == USE_SELECTED_FRAME)) |
| fi = get_selected_frame (NULL); |
| else |
| /* FIXME: cagney/2002-11-23: This code should be doing a |
| lookup using the frame ID and not just the frame's |
| ``address''. This, of course, means an interface |
| change. However, with out that interface change ISAs, |
| such as the ia64 with its two stacks, won't work. |
| Similar goes for the case where there is a frameless |
| function. */ |
| fi = find_frame_addr_in_frame_chain (frame); |
| } |
| else |
| fi = NULL; |
| |
| /* frame = -2 means always use selected frame. */ |
| if (type == USE_SELECTED_FRAME) |
| var->root->floating = 1; |
| |
| pc = 0; |
| block = NULL; |
| if (fi != NULL) |
| { |
| block = get_frame_block (fi, 0); |
| pc = get_frame_pc (fi); |
| } |
| |
| p = expression; |
| innermost_block = NULL; |
| /* Wrap the call to parse expression, so we can |
| return a sensible error. */ |
| TRY_CATCH (except, RETURN_MASK_ERROR) |
| { |
| var->root->exp = parse_exp_1 (&p, pc, block, 0); |
| } |
| |
| if (except.reason < 0) |
| { |
| do_cleanups (old_chain); |
| return NULL; |
| } |
| |
| /* 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) |
| { |
| do_cleanups (old_chain); |
| fprintf_unfiltered (gdb_stderr, "Attempt to use a type name" |
| " as an expression.\n"); |
| return NULL; |
| } |
| |
| var->format = variable_default_display (var); |
| var->root->valid_block = innermost_block; |
| var->name = xstrdup (expression); |
| /* For a root var, the name and the expr are the same. */ |
| var->path_expr = xstrdup (expression); |
| |
| /* When the frame is different from the current frame, |
| we must select the appropriate frame before parsing |
| the expression, otherwise the value will not be current. |
| Since select_frame is so benign, just call it for all cases. */ |
| if (innermost_block) |
| { |
| /* User could specify explicit FRAME-ADDR which was not found but |
| EXPRESSION is frame specific and we would not be able to evaluate |
| it correctly next time. With VALID_BLOCK set we must also set |
| FRAME and THREAD_ID. */ |
| if (fi == NULL) |
| error (_("Failed to find the specified frame")); |
| |
| var->root->frame = get_frame_id (fi); |
| var->root->thread_id = pid_to_thread_id (inferior_ptid); |
| old_id = get_frame_id (get_selected_frame (NULL)); |
| select_frame (fi); |
| } |
| |
| /* We definitely need to catch errors here. |
| If evaluate_expression succeeds we got the value we wanted. |
| But if it fails, we still go on with a call to evaluate_type(). */ |
| TRY_CATCH (except, RETURN_MASK_ERROR) |
| { |
| value = evaluate_expression (var->root->exp); |
| } |
| |
| if (except.reason < 0) |
| { |
| /* Error getting the value. Try to at least get the |
| right type. */ |
| struct value *type_only_value = evaluate_type (var->root->exp); |
| |
| var->type = value_type (type_only_value); |
| } |
| else |
| { |
| int real_type_found = 0; |
| |
| var->type = value_actual_type (value, 0, &real_type_found); |
| if (real_type_found) |
| value = value_cast (var->type, value); |
| } |
| |
| /* Set language info */ |
| var->root->lang_ops = var->root->exp->language_defn->la_varobj_ops; |
| |
| install_new_value (var, value, 1 /* Initial assignment */); |
| |
| /* Set ourselves as our root. */ |
| var->root->rootvar = var; |
| |
| /* Reset the selected frame. */ |
| if (frame_id_p (old_id)) |
| select_frame (frame_find_by_id (old_id)); |
| } |
| |
| /* If the variable object name is null, that means this |
| is a temporary variable, so don't install it. */ |
| |
| if ((var != NULL) && (objname != NULL)) |
| { |
| var->obj_name = xstrdup (objname); |
| |
| /* If a varobj name is duplicated, the install will fail so |
| we must cleanup. */ |
| if (!install_variable (var)) |
| { |
| do_cleanups (old_chain); |
| return NULL; |
| } |
| } |
| |
| discard_cleanups (old_chain); |
| return var; |
| } |
| |
| /* Generates an unique name that can be used for a varobj. */ |
| |
| char * |
| varobj_gen_name (void) |
| { |
| static int id = 0; |
| char *obj_name; |
| |
| /* Generate a name for this object. */ |
| id++; |
| obj_name = xstrprintf ("var%d", id); |
| |
| return obj_name; |
| } |
| |
| /* Given an OBJNAME, returns the pointer to the corresponding varobj. Call |
| error if OBJNAME cannot be found. */ |
| |
| struct varobj * |
| varobj_get_handle (char *objname) |
| { |
| struct vlist *cv; |
| const char *chp; |
| unsigned int index = 0; |
| unsigned int i = 1; |
| |
| for (chp = objname; *chp; chp++) |
| { |
| index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| } |
| |
| cv = *(varobj_table + index); |
| while ((cv != NULL) && (strcmp (cv->var->obj_name, objname) != 0)) |
| cv = cv->next; |
| |
| if (cv == NULL) |
| error (_("Variable object not found")); |
| |
| return cv->var; |
| } |
| |
| /* Given the handle, return the name of the object. */ |
| |
| char * |
| varobj_get_objname (struct varobj *var) |
| { |
| return var->obj_name; |
| } |
| |
| /* Given the handle, return the expression represented by the object. */ |
| |
| char * |
| varobj_get_expression (struct varobj *var) |
| { |
| return name_of_variable (var); |
| } |
| |
| /* Deletes a varobj and all its children if only_children == 0, |
| otherwise deletes only the children; returns a malloc'ed list of |
| all the (malloc'ed) names of the variables that have been deleted |
| (NULL terminated). */ |
| |
| int |
| varobj_delete (struct varobj *var, char ***dellist, int only_children) |
| { |
| int delcount; |
| int mycount; |
| struct cpstack *result = NULL; |
| char **cp; |
| |
| /* Initialize a stack for temporary results. */ |
| cppush (&result, NULL); |
| |
| if (only_children) |
| /* Delete only the variable children. */ |
| delcount = delete_variable (&result, var, 1 /* only the children */ ); |
| else |
| /* Delete the variable and all its children. */ |
| delcount = delete_variable (&result, var, 0 /* parent+children */ ); |
| |
| /* We may have been asked to return a list of what has been deleted. */ |
| if (dellist != NULL) |
| { |
| *dellist = xmalloc ((delcount + 1) * sizeof (char *)); |
| |
| cp = *dellist; |
| mycount = delcount; |
| *cp = cppop (&result); |
| while ((*cp != NULL) && (mycount > 0)) |
| { |
| mycount--; |
| cp++; |
| *cp = cppop (&result); |
| } |
| |
| if (mycount || (*cp != NULL)) |
| warning (_("varobj_delete: assertion failed - mycount(=%d) <> 0"), |
| mycount); |
| } |
| |
| return delcount; |
| } |
| |
| #if HAVE_PYTHON |
| |
| /* Convenience function for varobj_set_visualizer. Instantiate a |
| pretty-printer for a given value. */ |
| 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) |
| return NULL; |
| |
| printer = PyObject_CallFunctionObjArgs (constructor, val_obj, NULL); |
| Py_DECREF (val_obj); |
| return printer; |
| } |
| |
| #endif |
| |
| /* Set/Get variable object display format. */ |
| |
| enum varobj_display_formats |
| varobj_set_display_format (struct varobj *var, |
| enum varobj_display_formats format) |
| { |
| switch (format) |
| { |
| case FORMAT_NATURAL: |
| case FORMAT_BINARY: |
| case FORMAT_DECIMAL: |
| case FORMAT_HEXADECIMAL: |
| case FORMAT_OCTAL: |
| var->format = format; |
| break; |
| |
| default: |
| var->format = variable_default_display (var); |
| } |
| |
| if (varobj_value_is_changeable_p (var) |
| && var->value && !value_lazy (var->value)) |
| { |
| xfree (var->print_value); |
| var->print_value = varobj_value_get_print_value (var->value, |
| var->format, var); |
| } |
| |
| return var->format; |
| } |
| |
| enum varobj_display_formats |
| varobj_get_display_format (struct varobj *var) |
| { |
| return var->format; |
| } |
| |
| char * |
| varobj_get_display_hint (struct varobj *var) |
| { |
| char *result = NULL; |
| |
| #if HAVE_PYTHON |
| struct cleanup *back_to; |
| |
| if (!gdb_python_initialized) |
| return NULL; |
| |
| back_to = varobj_ensure_python_env (var); |
| |
| if (var->dynamic->pretty_printer != NULL) |
| result = gdbpy_get_display_hint (var->dynamic->pretty_printer); |
| |
| do_cleanups (back_to); |
| #endif |
| |
| return result; |
| } |
| |
| /* Return true if the varobj has items after TO, false otherwise. */ |
| |
| int |
| varobj_has_more (struct varobj *var, int to) |
| { |
| if (VEC_length (varobj_p, var->children) > to) |
| return 1; |
| return ((to == -1 || VEC_length (varobj_p, var->children) == to) |
| && (var->dynamic->saved_item != NULL)); |
| } |
| |
| /* If the variable object is bound to a specific thread, that |
| is its evaluation can always be done in context of a frame |
| inside that thread, returns GDB id of the thread -- which |
| is always positive. Otherwise, returns -1. */ |
| int |
| varobj_get_thread_id (struct varobj *var) |
| { |
| if (var->root->valid_block && var->root->thread_id > 0) |
| return var->root->thread_id; |
| else |
| return -1; |
| } |
| |
| void |
| varobj_set_frozen (struct varobj *var, int frozen) |
| { |
| /* When a variable is unfrozen, we don't fetch its value. |
| The 'not_fetched' flag remains set, so next -var-update |
| won't complain. |
| |
| We don't fetch the value, because for structures the client |
| should do -var-update anyway. It would be bad to have different |
| client-size logic for structure and other types. */ |
| var->frozen = frozen; |
| } |
| |
| int |
| varobj_get_frozen (struct varobj *var) |
| { |
| return var->frozen; |
| } |
| |
| /* A helper function that restricts a range to what is actually |
| available in a VEC. This follows the usual rules for the meaning |
| of FROM and TO -- if either is negative, the entire range is |
| used. */ |
| |
| void |
| varobj_restrict_range (VEC (varobj_p) *children, int *from, int *to) |
| { |
| if (*from < 0 || *to < 0) |
| { |
| *from = 0; |
| *to = VEC_length (varobj_p, children); |
| } |
| else |
| { |
| if (*from > VEC_length (varobj_p, children)) |
| *from = VEC_length (varobj_p, children); |
| if (*to > VEC_length (varobj_p, children)) |
| *to = VEC_length (varobj_p, children); |
| if (*from > *to) |
| *from = *to; |
| } |
| } |
| |
| #if HAVE_PYTHON |
| |
| /* A helper for update_dynamic_varobj_children that installs a new |
| child when needed. */ |
| |
| static void |
| install_dynamic_child (struct varobj *var, |
| VEC (varobj_p) **changed, |
| VEC (varobj_p) **type_changed, |
| VEC (varobj_p) **new, |
| VEC (varobj_p) **unchanged, |
| int *cchanged, |
| int index, |
| char *name, |
| struct value *value) |
| { |
| if (VEC_length (varobj_p, var->children) < index + 1) |
| { |
| /* There's no child yet. */ |
| struct varobj *child = varobj_add_child (var, name, value); |
| |
| if (new) |
| { |
| VEC_safe_push (varobj_p, *new, child); |
| *cchanged = 1; |
| } |
| } |
| else |
| { |
| varobj_p existing = VEC_index (varobj_p, var->children, index); |
| int type_updated = update_type_if_necessary (existing, value); |
| |
| if (type_updated) |
| { |
| if (type_changed) |
| VEC_safe_push (varobj_p, *type_changed, existing); |
| } |
| if (install_new_value (existing, value, 0)) |
| { |
| if (!type_updated && changed) |
| VEC_safe_push (varobj_p, *changed, existing); |
| } |
| else if (!type_updated && unchanged) |
| VEC_safe_push (varobj_p, *unchanged, existing); |
| } |
| } |
| |
| static int |
| dynamic_varobj_has_child_method (struct varobj *var) |
| { |
| struct cleanup *back_to; |
| PyObject *printer = var->dynamic->pretty_printer; |
| int result; |
| |
| if (!gdb_python_initialized) |
| return 0; |
| |
| back_to = varobj_ensure_python_env (var); |
| result = PyObject_HasAttr (printer, gdbpy_children_cst); |
| do_cleanups (back_to); |
| return result; |
| } |
| |
| #endif |
| |
| static int |
| update_dynamic_varobj_children (struct varobj *var, |
| VEC (varobj_p) **changed, |
| VEC (varobj_p) **type_changed, |
| VEC (varobj_p) **new, |
| VEC (varobj_p) **unchanged, |
| int *cchanged, |
| int update_children, |
| int from, |
| int to) |
| { |
| #if HAVE_PYTHON |
| struct cleanup *back_to; |
| PyObject *children; |
| int i; |
| PyObject *printer = var->dynamic->pretty_printer; |
| |
| if (!gdb_python_initialized) |
| return 0; |
| |
| back_to = varobj_ensure_python_env (var); |
| |
| *cchanged = 0; |
| if (!PyObject_HasAttr (printer, gdbpy_children_cst)) |
| { |
| do_cleanups (back_to); |
| return 0; |
| } |
| |
| if (update_children || var->dynamic->child_iter == NULL) |
| { |
| children = PyObject_CallMethodObjArgs (printer, gdbpy_children_cst, |
| NULL); |
| |
| if (!children) |
| { |
| gdbpy_print_stack (); |
| error (_("Null value returned for children")); |
| } |
| |
| make_cleanup_py_decref (children); |
| |
| Py_XDECREF (var->dynamic->child_iter); |
| var->dynamic->child_iter = PyObject_GetIter (children); |
| if (var->dynamic->child_iter == NULL) |
| { |
| gdbpy_print_stack (); |
| error (_("Could not get children iterator")); |
| } |
| |
| Py_XDECREF (var->dynamic->saved_item); |
| var->dynamic->saved_item = NULL; |
| |
| i = 0; |
| } |
| else |
| i = VEC_length (varobj_p, var->children); |
| |
| /* We ask for one extra child, so that MI can report whether there |
| are more children. */ |
| for (; to < 0 || i < to + 1; ++i) |
| { |
| PyObject *item; |
| int force_done = 0; |
| |
| /* See if there was a leftover from last time. */ |
| if (var->dynamic->saved_item) |
| { |
| item = var->dynamic->saved_item; |
| var->dynamic->saved_item = NULL; |
| } |
| else |
| item = PyIter_Next (var->dynamic->child_iter); |
| |
| if (!item) |
| { |
| /* Normal end of iteration. */ |
| if (!PyErr_Occurred ()) |
| break; |
| |
| /* If we got a memory error, just use the text as the |
| item. */ |
| if (PyErr_ExceptionMatches (gdbpy_gdb_memory_error)) |
| { |
| PyObject *type, *value, *trace; |
| char *name_str, *value_str; |
| |
| PyErr_Fetch (&type, &value, &trace); |
| value_str = gdbpy_exception_to_string (type, value); |
| Py_XDECREF (type); |
| Py_XDECREF (value); |
| Py_XDECREF (trace); |
| if (!value_str) |
| { |
| gdbpy_print_stack (); |
| break; |
| } |
| |
| name_str = xstrprintf ("<error at %d>", i); |
| item = Py_BuildValue ("(ss)", name_str, value_str); |
| xfree (name_str); |
| xfree (value_str); |
| if (!item) |
| { |
| gdbpy_print_stack (); |
| break; |
| } |
| |
| force_done = 1; |
| } |
| else |
| { |
| /* Any other kind of error. */ |
| gdbpy_print_stack (); |
| break; |
| } |
| } |
| |
| /* We don't want to push the extra child on any report list. */ |
| if (to < 0 || i < to) |
| { |
| PyObject *py_v; |
| const char *name; |
| struct value *v; |
| struct cleanup *inner; |
| int can_mention = from < 0 || i >= from; |
| |
| inner = make_cleanup_py_decref (item); |
| |
| if (!PyArg_ParseTuple (item, "sO", &name, &py_v)) |
| { |
| gdbpy_print_stack (); |
| error (_("Invalid item from the child list")); |
| } |
| |
| v = convert_value_from_python (py_v); |
| if (v == NULL) |
| gdbpy_print_stack (); |
| install_dynamic_child (var, can_mention ? changed : NULL, |
| can_mention ? type_changed : NULL, |
| can_mention ? new : NULL, |
| can_mention ? unchanged : NULL, |
| can_mention ? cchanged : NULL, i, |
| xstrdup (name), v); |
| do_cleanups (inner); |
| } |
| else |
| { |
| Py_XDECREF (var->dynamic->saved_item); |
| var->dynamic->saved_item = item; |
| |
| /* We want to truncate the child list just before this |
| element. */ |
| break; |
| } |
| |
| if (force_done) |
| break; |
| } |
| |
| if (i < VEC_length (varobj_p, var->children)) |
| { |
| int j; |
| |
| *cchanged = 1; |
| for (j = i; j < VEC_length (varobj_p, var->children); ++j) |
| varobj_delete (VEC_index (varobj_p, var->children, j), NULL, 0); |
| VEC_truncate (varobj_p, var->children, i); |
| } |
| |
| /* If there are fewer children than requested, note that the list of |
| children changed. */ |
| if (to >= 0 && VEC_length (varobj_p, var->children) < to) |
| *cchanged = 1; |
| |
| var->num_children = VEC_length (varobj_p, var->children); |
| |
| do_cleanups (back_to); |
| |
| return 1; |
| #else |
| gdb_assert_not_reached ("should never be called if Python is not enabled"); |
| #endif |
| } |
| |
| int |
| varobj_get_num_children (struct varobj *var) |
| { |
| if (var->num_children == -1) |
| { |
| if (var->dynamic->pretty_printer != NULL) |
| { |
| int dummy; |
| |
| /* If we have a dynamic varobj, don't report -1 children. |
| So, try to fetch some children first. */ |
| update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, &dummy, |
| 0, 0, 0); |
| } |
| else |
| var->num_children = number_of_children (var); |
| } |
| |
| return var->num_children >= 0 ? var->num_children : 0; |
| } |
| |
| /* Creates a list of the immediate children of a variable object; |
| the return code is the number of such children or -1 on error. */ |
| |
| VEC (varobj_p)* |
| varobj_list_children (struct varobj *var, int *from, int *to) |
| { |
| char *name; |
| int i, children_changed; |
| |
| var->dynamic->children_requested = 1; |
| |
| if (var->dynamic->pretty_printer != NULL) |
| { |
| /* This, in theory, can result in the number of children changing without |
| frontend noticing. But well, calling -var-list-children on the same |
| varobj twice is not something a sane frontend would do. */ |
| update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, |
| &children_changed, 0, 0, *to); |
| varobj_restrict_range (var->children, from, to); |
| return var->children; |
| } |
| |
| if (var->num_children == -1) |
| var->num_children = number_of_children (var); |
| |
| /* If that failed, give up. */ |
| if (var->num_children == -1) |
| return var->children; |
| |
| /* If we're called when the list of children is not yet initialized, |
| allocate enough elements in it. */ |
| while (VEC_length (varobj_p, var->children) < var->num_children) |
| VEC_safe_push (varobj_p, var->children, NULL); |
| |
| for (i = 0; i < var->num_children; i++) |
| { |
| varobj_p existing = VEC_index (varobj_p, var->children, i); |
| |
| if (existing == NULL) |
| { |
| /* Either it's the first call to varobj_list_children for |
| this variable object, and the child was never created, |
| or it was explicitly deleted by the client. */ |
| name = name_of_child (var, i); |
| existing = create_child (var, i, name); |
| VEC_replace (varobj_p, var->children, i, existing); |
| } |
| } |
| |
| varobj_restrict_range (var->children, from, to); |
| return var->children; |
| } |
| |
| #if HAVE_PYTHON |
| |
| static struct varobj * |
| varobj_add_child (struct varobj *var, char *name, struct value *value) |
| { |
| varobj_p v = create_child_with_value (var, |
| VEC_length (varobj_p, var->children), |
| name, value); |
| |
| VEC_safe_push (varobj_p, var->children, v); |
| return v; |
| } |
| |
| #endif /* HAVE_PYTHON */ |
| |
| /* Obtain the type of an object Variable as a string similar to the one gdb |
| prints on the console. */ |
| |
| char * |
| varobj_get_type (struct varobj *var) |
| { |
| /* For the "fake" variables, do not return a type. (Its type is |
| NULL, too.) |
| Do not return a type for invalid variables as well. */ |
| if (CPLUS_FAKE_CHILD (var) || !var->root->is_valid) |
| return NULL; |
| |
| return type_to_string (var->type); |
| } |
| |
| /* Obtain the type of an object variable. */ |
| |
| struct type * |
| varobj_get_gdb_type (struct varobj *var) |
| { |
| return var->type; |
| } |
| |
| /* Is VAR a path expression parent, i.e., can it be used to construct |
| a valid path expression? */ |
| |
| static int |
| is_path_expr_parent (struct varobj *var) |
| { |
| struct type *type; |
| |
| /* "Fake" children are not path_expr parents. */ |
| if (CPLUS_FAKE_CHILD (var)) |
| return 0; |
| |
| type = varobj_get_value_type (var); |
| |
| /* Anonymous unions and structs are also not path_expr parents. */ |
| return !((TYPE_CODE (type) == TYPE_CODE_STRUCT |
| || TYPE_CODE (type) == TYPE_CODE_UNION) |
| && TYPE_NAME (type) == NULL); |
| } |
| |
| /* Return the path expression parent for VAR. */ |
| |
| struct varobj * |
| varobj_get_path_expr_parent (struct varobj *var) |
| { |
| struct varobj *parent = var; |
| |
| while (!is_root_p (parent) && !is_path_expr_parent (parent)) |
| parent = parent->parent; |
| |
| return parent; |
| } |
| |
| /* Return a pointer to the full rooted expression of varobj VAR. |
| If it has not been computed yet, compute it. */ |
| char * |
| varobj_get_path_expr (struct varobj *var) |
| { |
| if (var->path_expr != NULL) |
| return var->path_expr; |
| else |
| { |
| /* For root varobjs, we initialize path_expr |
| when creating varobj, so here it should be |
| child varobj. */ |
| gdb_assert (!is_root_p (var)); |
| return (*var->root->lang_ops->path_expr_of_child) (var); |
| } |
| } |
| |
| const struct language_defn * |
| varobj_get_language (struct varobj *var) |
| { |
| return var->root->exp->language_defn; |
| } |
| |
| int |
| varobj_get_attributes (struct varobj *var) |
| { |
| int attributes = 0; |
| |
| if (varobj_editable_p (var)) |
| /* FIXME: define masks for attributes. */ |
| attributes |= 0x00000001; /* Editable */ |
| |
| return attributes; |
| } |
| |
| int |
| varobj_pretty_printed_p (struct varobj *var) |
| { |
| return var->dynamic->pretty_printer != NULL; |
| } |
| |
| char * |
| varobj_get_formatted_value (struct varobj *var, |
| enum varobj_display_formats format) |
| { |
| return my_value_of_variable (var, format); |
| } |
| |
| char * |
| varobj_get_value (struct varobj *var) |
| { |
| return my_value_of_variable (var, var->format); |
| } |
| |
| /* Set the value of an object variable (if it is editable) to the |
| value of the given expression. */ |
| /* Note: Invokes functions that can call error(). */ |
| |
| int |
| varobj_set_value (struct varobj *var, char *expression) |
| { |
| struct value *val = NULL; /* Initialize to keep gcc happy. */ |
| /* The argument "expression" contains the variable's new value. |
| We need to first construct a legal expression for this -- ugh! */ |
| /* Does this cover all the bases? */ |
| struct expression *exp; |
| struct value *value = NULL; /* Initialize to keep gcc happy. */ |
| int saved_input_radix = input_radix; |
| const char *s = expression; |
| volatile struct gdb_exception except; |
| |
| gdb_assert (varobj_editable_p (var)); |
| |
| input_radix = 10; /* ALWAYS reset to decimal temporarily. */ |
| exp = parse_exp_1 (&s, 0, 0, 0); |
| TRY_CATCH (except, RETURN_MASK_ERROR) |
| { |
| value = evaluate_expression (exp); |
| } |
| |
| if (except.reason < 0) |
| { |
| /* We cannot proceed without a valid expression. */ |
| xfree (exp); |
| return 0; |
| } |
| |
| /* All types that are editable must also be changeable. */ |
| gdb_assert (varobj_value_is_changeable_p (var)); |
| |
| /* The value of a changeable variable object must not be lazy. */ |
| gdb_assert (!value_lazy (var->value)); |
| |
| /* Need to coerce the input. We want to check if the |
| value of the variable object will be different |
| after assignment, and the first thing value_assign |
| does is coerce the input. |
| For example, if we are assigning an array to a pointer variable we |
| should compare the pointer with the array's address, not with the |
| array's content. */ |
| value = coerce_array (value); |
| |
| /* The new value may be lazy. value_assign, or |
| rather value_contents, will take care of this. */ |
| TRY_CATCH (except, RETURN_MASK_ERROR) |
| { |
| val = value_assign (var->value, value); |
| } |
| |
| if (except.reason < 0) |
| return 0; |
| |
| /* If the value has changed, record it, so that next -var-update can |
| report this change. If a variable had a value of '1', we've set it |
| to '333' and then set again to '1', when -var-update will report this |
| variable as changed -- because the first assignment has set the |
| 'updated' flag. There's no need to optimize that, because return value |
| of -var-update should be considered an approximation. */ |
| var->updated = install_new_value (var, val, 0 /* Compare values. */); |
| input_radix = saved_input_radix; |
| return 1; |
| } |
| |
| #if HAVE_PYTHON |
| |
| /* A helper function to install a constructor function and visualizer |
| in a varobj_dynamic. */ |
| |
| static void |
| install_visualizer (struct varobj_dynamic *var, PyObject *constructor, |
| PyObject *visualizer) |
| { |
| Py_XDECREF (var->constructor); |
| var->constructor = constructor; |
| |
| Py_XDECREF (var->pretty_printer); |
| var->pretty_printer = visualizer; |
| |
| Py_XDECREF (var->child_iter); |
| var->child_iter = NULL; |
| } |
| |
| /* Install the default visualizer for VAR. */ |
| |
| static void |
| install_default_visualizer (struct varobj *var) |
| { |
| /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
| if (CPLUS_FAKE_CHILD (var)) |
| return; |
| |
| if (pretty_printing) |
| { |
| PyObject *pretty_printer = NULL; |
| |
| if (var->value) |
| { |
| pretty_printer = gdbpy_get_varobj_pretty_printer (var->value); |
| if (! pretty_printer) |
| { |
| gdbpy_print_stack (); |
| error (_("Cannot instantiate printer for default visualizer")); |
| } |
| } |
| |
| if (pretty_printer == Py_None) |
| { |
| Py_DECREF (pretty_printer); |
| pretty_printer = NULL; |
| } |
| |
| install_visualizer (var->dynamic, NULL, pretty_printer); |
| } |
| } |
| |
| /* Instantiate and install a visualizer for VAR using CONSTRUCTOR to |
| make a new object. */ |
| |
| static void |
| construct_visualizer (struct varobj *var, PyObject *constructor) |
| { |
| PyObject *pretty_printer; |
| |
| /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
| if (CPLUS_FAKE_CHILD (var)) |
| return; |
| |
| Py_INCREF (constructor); |
| if (constructor == Py_None) |
| pretty_printer = NULL; |
| else |
| { |
| pretty_printer = instantiate_pretty_printer (constructor, var->value); |
| if (! pretty_printer) |
| { |
| gdbpy_print_stack (); |
| Py_DECREF (constructor); |
| constructor = Py_None; |
| Py_INCREF (constructor); |
| } |
| |
| if (pretty_printer == Py_None) |
| { |
| Py_DECREF (pretty_printer); |
| pretty_printer = NULL; |
| } |
| } |
| |
| install_visualizer (var->dynamic, constructor, pretty_printer); |
| } |
| |
| #endif /* HAVE_PYTHON */ |
| |
| /* A helper function for install_new_value. This creates and installs |
| a visualizer for VAR, if appropriate. */ |
| |
| static void |
| install_new_value_visualizer (struct varobj *var) |
| { |
| #if HAVE_PYTHON |
| /* If the constructor is None, then we want the raw value. If VAR |
| does not have a value, just skip this. */ |
| if (!gdb_python_initialized) |
| return; |
| |
| if (var->dynamic->constructor != Py_None && var->value != NULL) |
| { |
| struct cleanup *cleanup; |
| |
| cleanup = varobj_ensure_python_env (var); |
| |
| if (var->dynamic->constructor == NULL) |
| install_default_visualizer (var); |
| else |
| construct_visualizer (var, var->dynamic->constructor); |
| |
| do_cleanups (cleanup); |
| } |
| #else |
| /* Do nothing. */ |
| #endif |
| } |
| |
| /* When using RTTI to determine variable type it may be changed in runtime when |
| the variable value is changed. This function checks whether type of varobj |
| VAR will change when a new value NEW_VALUE is assigned and if it is so |
| updates the type of VAR. */ |
| |
| static int |
| update_type_if_necessary (struct varobj *var, struct value *new_value) |
| { |
| if (new_value) |
| { |
| struct value_print_options opts; |
| |
| get_user_print_options (&opts); |
| if (opts.objectprint) |
| { |
| struct type *new_type; |
| char *curr_type_str, *new_type_str; |
| |
| new_type = value_actual_type (new_value, 0, 0); |
| new_type_str = type_to_string (new_type); |
| curr_type_str = varobj_get_type (var); |
| if (strcmp (curr_type_str, new_type_str) != 0) |
| { |
| var->type = new_type; |
| |
| /* This information may be not valid for a new type. */ |
| varobj_delete (var, NULL, 1); |
| VEC_free (varobj_p, var->children); |
| var->num_children = -1; |
| return 1; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Assign a new value to a variable object. If INITIAL is non-zero, |
| this is the first assignement after the variable object was just |
| created, or changed type. In that case, just assign the value |
| and return 0. |
| Otherwise, assign the new value, and return 1 if the value is |
| different from the current one, 0 otherwise. The comparison is |
| done on textual representation of value. Therefore, some types |
| need not be compared. E.g. for structures the reported value is |
| always "{...}", so no comparison is necessary here. If the old |
| value was NULL and new one is not, or vice versa, we always return 1. |
| |
| The VALUE parameter should not be released -- the function will |
| take care of releasing it when needed. */ |
| static int |
| install_new_value (struct varobj *var, struct value *value, int initial) |
| { |
| int changeable; |
| int need_to_fetch; |
| int changed = 0; |
| int intentionally_not_fetched = 0; |
| char *print_value = NULL; |
| |
| /* We need to know the varobj's type to decide if the value should |
| be fetched or not. C++ fake children (public/protected/private) |
| don't have a type. */ |
| gdb_assert (var->type || CPLUS_FAKE_CHILD (var)); |
| changeable = varobj_value_is_changeable_p (var); |
| |
| /* If the type has custom visualizer, we consider it to be always |
| changeable. FIXME: need to make sure this behaviour will not |
| mess up read-sensitive values. */ |
| if (var->dynamic->pretty_printer != NULL) |
| changeable = 1; |
| |
| need_to_fetch = changeable; |
| |
| /* We are not interested in the address of references, and given |
| that in C++ a reference is not rebindable, it cannot |
| meaningfully change. So, get hold of the real value. */ |
| if (value) |
| value = coerce_ref (value); |
| |
| if (var->type && TYPE_CODE (var->type) == TYPE_CODE_UNION) |
| /* For unions, we need to fetch the value implicitly because |
| of implementation of union member fetch. When gdb |
| creates a value for a field and the value of the enclosing |
| structure is not lazy, it immediately copies the necessary |
| bytes from the enclosing values. If the enclosing value is |
| lazy, the call to value_fetch_lazy on the field will read |
| the data from memory. For unions, that means we'll read the |
| same memory more than once, which is not desirable. So |
| fetch now. */ |
| need_to_fetch = 1; |
| |
| /* The new value might be lazy. If the type is changeable, |
| that is we'll be comparing values of this type, fetch the |
| value now. Otherwise, on the next update the old value |
| will be lazy, which means we've lost that old value. */ |
| if (need_to_fetch && value && value_lazy (value)) |
| { |
| struct varobj *parent = var->parent; |
| int frozen = var->frozen; |
| |
| for (; !frozen && parent; parent = parent->parent) |
| frozen |= parent->frozen; |
| |
| if (frozen && initial) |
| { |
| /* For variables that are frozen, or are children of frozen |
| variables, we don't do fetch on initial assignment. |
| For non-initial assignemnt we do the fetch, since it means we're |
| explicitly asked to compare the new value with the old one. */ |
| intentionally_not_fetched = 1; |
| } |
| else |
| { |
| volatile struct gdb_exception except; |
| |
| TRY_CATCH (except, RETURN_MASK_ERROR) |
| { |
| value_fetch_lazy (value); |
| } |
| |
| if (except.reason < 0) |
| { |
| /* Set the value to NULL, so that for the next -var-update, |
| we don't try to compare the new value with this value, |
| that we couldn't even read. */ |
| value = NULL; |
| } |
| } |
| } |
| |
| /* Get a reference now, before possibly passing it to any Python |
| code that might release it. */ |
| if (value != NULL) |
| value_incref (value); |
| |
| /* Below, we'll be comparing string rendering of old and new |
| values. Don't get string rendering if the value is |
| lazy -- if it is, the code above has decided that the value |
| should not be fetched. */ |
| if (value != NULL && !value_lazy (value) |
| && var->dynamic->pretty_printer == NULL) |
| print_value = varobj_value_get_print_value (value, var->format, var); |
| |
| /* If the type is changeable, compare the old and the new values. |
| If this is the initial assignment, we don't have any old value |
| to compare with. */ |
| if (!initial && changeable) |
| { |
| /* If the value of the varobj was changed by -var-set-value, |
| then the value in the varobj and in the target is the same. |
| However, that value is different from the value that the |
| varobj had after the previous -var-update. So need to the |
| varobj as changed. */ |
| if (var->updated) |
| { |
| changed = 1; |
| } |
| else if (var->dynamic->pretty_printer == NULL) |
| { |
| /* Try to compare the values. That requires that both |
| values are non-lazy. */ |
| if (var->not_fetched && value_lazy (var->value)) |
| { |
| /* This is a frozen varobj and the value was never read. |
| Presumably, UI shows some "never read" indicator. |
| Now that we've fetched the real value, we need to report |
| this varobj as changed so that UI can show the real |
| value. */ |
| changed = 1; |
| } |
| else if (var->value == NULL && value == NULL) |
| /* Equal. */ |
| ; |
| else if (var->value == NULL || value == NULL) |
| { |
| changed = 1; |
| } |
| else |
| { |
| gdb_assert (!value_lazy (var->value)); |
| gdb_assert (!value_lazy (value)); |
| |
| gdb_assert (var->print_value != NULL && print_value != NULL); |
| if (strcmp (var->print_value, print_value) != 0) |
| changed = 1; |
| } |
| } |
| } |
| |
| if (!initial && !changeable) |
| { |
| /* For values that are not changeable, we don't compare the values. |
| However, we want to notice if a value was not NULL and now is NULL, |
| or vise versa, so that we report when top-level varobjs come in scope |
| and leave the scope. */ |
| changed = (var->value != NULL) != (value != NULL); |
| } |
| |
| /* We must always keep the new value, since children depend on it. */ |
| if (var->value != NULL && var->value != value) |
| value_free (var->value); |
| var->value = value; |
| if (value && value_lazy (value) && intentionally_not_fetched) |
| var->not_fetched = 1; |
| else |
| var->not_fetched = 0; |
| var->updated = 0; |
| |
| install_new_value_visualizer (var); |
| |
| /* If we installed a pretty-printer, re-compare the printed version |
| to see if the variable changed. */ |
| if (var->dynamic->pretty_printer != NULL) |
| { |
| xfree (print_value); |
| print_value = varobj_value_get_print_value (var->value, var->format, |
| var); |
| if ((var->print_value == NULL && print_value != NULL) |
| || (var->print_value != NULL && print_value == NULL) |
| || (var->print_value != NULL && print_value != NULL |
| && strcmp (var->print_value, print_value) != 0)) |
| changed = 1; |
| } |
| if (var->print_value) |
| xfree (var->print_value); |
| var->print_value = print_value; |
| |
| gdb_assert (!var->value || value_type (var->value)); |
| |
| return changed; |
| } |
| |
| /* Return the requested range for a varobj. VAR is the varobj. FROM |
| and TO are out parameters; *FROM and *TO will be set to the |
| selected sub-range of VAR. If no range was selected using |
| -var-set-update-range, then both will be -1. */ |
| void |
| varobj_get_child_range (struct varobj *var, int *from, int *to) |
| { |
| *from = var->from; |
| *to = var->to; |
| } |
| |
| /* Set the selected sub-range of children of VAR to start at index |
| FROM and end at index TO. If either FROM or TO is less than zero, |
| this is interpreted as a request for all children. */ |
| void |
| varobj_set_child_range (struct varobj *var, int from, int to) |
| { |
| var->from = from; |
| var->to = to; |
| } |
| |
| void |
| varobj_set_visualizer (struct varobj *var, const char *visualizer) |
| { |
| #if HAVE_PYTHON |
| PyObject *mainmod, *globals, *constructor; |
| struct cleanup *back_to; |
| |
| if (!gdb_python_initialized) |
| return; |
| |
| back_to = varobj_ensure_python_env (var); |
| |
| mainmod = PyImport_AddModule ("__main__"); |
| globals = PyModule_GetDict (mainmod); |
| Py_INCREF (globals); |
| make_cleanup_py_decref (globals); |
| |
| constructor = PyRun_String (visualizer, Py_eval_input, globals, globals); |
| |
| if (! constructor) |
| { |
| gdbpy_print_stack (); |
| error (_("Could not evaluate visualizer expression: %s"), visualizer); |
| } |
| |
| construct_visualizer (var, constructor); |
| Py_XDECREF (constructor); |
| |
| /* If there are any children now, wipe them. */ |
| varobj_delete (var, NULL, 1 /* children only */); |
| var->num_children = -1; |
| |
| do_cleanups (back_to); |
| #else |
| error (_("Python support required")); |
| #endif |
| } |
| |
| /* If NEW_VALUE is the new value of the given varobj (var), return |
| non-zero if var has mutated. In other words, if the type of |
| the new value is different from the type of the varobj's old |
| value. |
| |
| NEW_VALUE may be NULL, if the varobj is now out of scope. */ |
| |
| static int |
| varobj_value_has_mutated (struct varobj *var, struct value *new_value, |
| struct type *new_type) |
| { |
| /* If we haven't previously computed the number of children in var, |
| it does not matter from the front-end's perspective whether |
| the type has mutated or not. For all intents and purposes, |
| it has not mutated. */ |
| if (var->num_children < 0) |
| return 0; |
| |
| if (var->root->lang_ops->value_has_mutated) |
| return var->root->lang_ops->value_has_mutated (var, new_value, new_type); |
| else |
| return 0; |
| } |
| |
| /* Update the values for a variable and its children. This is a |
| two-pronged attack. First, re-parse the value for the root's |
| expression to see if it's changed. Then go all the way |
| through its children, reconstructing them and noting if they've |
| changed. |
| |
| The EXPLICIT parameter specifies if this call is result |
| of MI request to update this specific variable, or |
| result of implicit -var-update *. For implicit request, we don't |
| update frozen variables. |
| |
| NOTE: This function may delete the caller's varobj. If it |
| returns TYPE_CHANGED, then it has done this and VARP will be modified |
| to point to the new varobj. */ |
| |
| VEC(varobj_update_result) * |
| varobj_update (struct varobj **varp, int explicit) |
| { |
| int type_changed = 0; |
| int i; |
| struct value *new; |
| VEC (varobj_update_result) *stack = NULL; |
| VEC (varobj_update_result) *result = NULL; |
| |
| /* Frozen means frozen -- we don't check for any change in |
| this varobj, including its going out of scope, or |
| changing type. One use case for frozen varobjs is |
| retaining previously evaluated expressions, and we don't |
| want them to be reevaluated at all. */ |
| if (!explicit && (*varp)->frozen) |
| return result; |
| |
| if (!(*varp)->root->is_valid) |
| { |
| varobj_update_result r = {0}; |
| |
| r.varobj = *varp; |
| r.status = VAROBJ_INVALID; |
| VEC_safe_push (varobj_update_result, result, &r); |
| return result; |
| } |
| |
| if ((*varp)->root->rootvar == *varp) |
| { |
| varobj_update_result r = {0}; |
| |
| r.varobj = *varp; |
| r.status = VAROBJ_IN_SCOPE; |
| |
| /* Update the root variable. value_of_root can return NULL |
| if the variable is no longer around, i.e. we stepped out of |
| the frame in which a local existed. We are letting the |
| value_of_root variable dispose of the varobj if the type |
| has changed. */ |
| new = value_of_root (varp, &type_changed); |
| if (update_type_if_necessary(*varp, new)) |
| type_changed = 1; |
| r.varobj = *varp; |
| r.type_changed = type_changed; |
| if (install_new_value ((*varp), new, type_changed)) |
| r.changed = 1; |
| |
| if (new == NULL) |
| r.status = VAROBJ_NOT_IN_SCOPE; |
| r.value_installed = 1; |
| |
| if (r.status == VAROBJ_NOT_IN_SCOPE) |
| { |
| if (r.type_changed || r.changed) |
| VEC_safe_push (varobj_update_result, result, &r); |
| return result; |
| } |
| |
| VEC_safe_push (varobj_update_result, stack, &r); |
| } |
| else |
| { |
| varobj_update_result r = {0}; |
| |
| r.varobj = *varp; |
| VEC_safe_push (varobj_update_result, stack, &r); |
| } |
| |
| /* Walk through the children, reconstructing them all. */ |
| while (!VEC_empty (varobj_update_result, stack)) |
| { |
| varobj_update_result r = *(VEC_last (varobj_update_result, stack)); |
| struct varobj *v = r.varobj; |
| |
| VEC_pop (varobj_update_result, stack); |
| |
| /* Update this variable, unless it's a root, which is already |
| updated. */ |
| if (!r.value_installed) |
| { |
| struct type *new_type; |
| |
| new = value_of_child (v->parent, v->index); |
| if (update_type_if_necessary(v, new)) |
| r.type_changed = 1; |
| if (new) |
| new_type = value_type (new); |
| else |
| new_type = v->root->lang_ops->type_of_child (v->parent, v->index); |
| |
| if (varobj_value_has_mutated (v, new, new_type)) |
| { |
| /* The children are no longer valid; delete them now. |
| Report the fact that its type changed as well. */ |
| varobj_delete (v, NULL, 1 /* only_children */); |
| v->num_children = -1; |
| v->to = -1; |
| v->from = -1; |
| v->type = new_type; |
| r.type_changed = 1; |
| } |
| |
| if (install_new_value (v, new, r.type_changed)) |
| { |
| r.changed = 1; |
| v->updated = 0; |
| } |
| } |
| |
| /* We probably should not get children of a varobj that has a |
| pretty-printer, but for which -var-list-children was never |
| invoked. */ |
| if (v->dynamic->pretty_printer != NULL) |
| { |
| VEC (varobj_p) *changed = 0, *type_changed = 0, *unchanged = 0; |
| VEC (varobj_p) *new = 0; |
| int i, children_changed = 0; |
| |
| if (v->frozen) |
| continue; |
| |
| if (!v->dynamic->children_requested) |
| { |
| int dummy; |
| |
| /* If we initially did not have potential children, but |
| now we do, consider the varobj as changed. |
| Otherwise, if children were never requested, consider |
| it as unchanged -- presumably, such varobj is not yet |
| expanded in the UI, so we need not bother getting |
| it. */ |
| if (!varobj_has_more (v, 0)) |
| { |
| update_dynamic_varobj_children (v, NULL, NULL, NULL, NULL, |
| &dummy, 0, 0, 0); |
| if (varobj_has_more (v, 0)) |
| r.changed = 1; |
| } |
| |
| if (r.changed) |
| VEC_safe_push (varobj_update_result, result, &r); |
| |
| continue; |
| } |
| |
| /* If update_dynamic_varobj_children returns 0, then we have |
| a non-conforming pretty-printer, so we skip it. */ |
| if (update_dynamic_varobj_children (v, &changed, &type_changed, &new, |
| &unchanged, &children_changed, 1, |
| v->from, v->to)) |
| { |
| if (children_changed || new) |
| { |
| r.children_changed = 1; |
| r.new = new; |
| } |
| /* Push in reverse order so that the first child is |
| popped from the work stack first, and so will be |
| added to result first. This does not affect |
| correctness, just "nicer". */ |
| for (i = VEC_length (varobj_p, type_changed) - 1; i >= 0; --i) |
| { |
| varobj_p tmp = VEC_index (varobj_p, type_changed, i); |
| varobj_update_result r = {0}; |
| |
| /* Type may change only if value was changed. */ |
| r.varobj = tmp; |
| r.changed = 1; |
| r.type_changed = 1; |
| r.value_installed = 1; |
| VEC_safe_push (varobj_update_result, stack, &r); |
| } |
| for (i = VEC_length (varobj_p, changed) - 1; i >= 0; --i) |
| { |
| varobj_p tmp = VEC_index (varobj_p, changed, i); |
| varobj_update_result r = {0}; |
| |
| r.varobj = tmp; |
| r.changed = 1; |
| r.value_installed = 1; |
| VEC_safe_push (varobj_update_result, stack, &r); |
| } |
| for (i = VEC_length (varobj_p, unchanged) - 1; i >= 0; --i) |
| { |
| varobj_p tmp = VEC_index (varobj_p, unchanged, i); |
| |
| if (!tmp->frozen) |
| { |
| varobj_update_result r = {0}; |
| |
| r.varobj = tmp; |
| r.value_installed = 1; |
| VEC_safe_push (varobj_update_result, stack, &r); |
| } |
| } |
| if (r.changed || r.children_changed) |
| VEC_safe_push (varobj_update_result, result, &r); |
| |
| /* Free CHANGED, TYPE_CHANGED and UNCHANGED, but not NEW, |
| because NEW has been put into the result vector. */ |
| VEC_free (varobj_p, changed); |
| VEC_free (varobj_p, type_changed); |
| VEC_free (varobj_p, unchanged); |
| |
| continue; |
| } |
| } |
| |
| /* Push any children. Use reverse order so that the first |
| child is popped from the work stack first, and so |
| will be added to result first. This does not |
| affect correctness, just "nicer". */ |
| for (i = VEC_length (varobj_p, v->children)-1; i >= 0; --i) |
| { |
| varobj_p c = VEC_index (varobj_p, v->children, i); |
| |
| /* Child may be NULL if explicitly deleted by -var-delete. */ |
| if (c != NULL && !c->frozen) |
| { |
| varobj_update_result r = {0}; |
| |
| r.varobj = c; |
| VEC_safe_push (varobj_update_result, stack, &r); |
| } |
| } |
| |
| if (r.changed || r.type_changed) |
| VEC_safe_push (varobj_update_result, result, &r); |
| } |
| |
| VEC_free (varobj_update_result, stack); |
| |
| return result; |
| } |
| |
| |
| /* Helper functions */ |
| |
| /* |
| * Variable object construction/destruction |
| */ |
| |
| static int |
| delete_variable (struct cpstack **resultp, struct varobj *var, |
| int only_children_p) |
| { |
| int delcount = 0; |
| |
| delete_variable_1 (resultp, &delcount, var, |
| only_children_p, 1 /* remove_from_parent_p */ ); |
| |
| return delcount; |
| } |
| |
| /* Delete the variable object VAR and its children. */ |
| /* IMPORTANT NOTE: If we delete a variable which is a child |
| and the parent is not removed we dump core. It must be always |
| initially called with remove_from_parent_p set. */ |
| static void |
| delete_variable_1 (struct cpstack **resultp, int *delcountp, |
| struct varobj *var, int only_children_p, |
| int remove_from_parent_p) |
| { |
| int i; |
| |
| /* Delete any children of this variable, too. */ |
| for (i = 0; i < VEC_length (varobj_p, var->children); ++i) |
| { |
| varobj_p child = VEC_index (varobj_p, var->children, i); |
| |
| if (!child) |
| continue; |
| if (!remove_from_parent_p) |
| child->parent = NULL; |
| delete_variable_1 (resultp, delcountp, child, 0, only_children_p); |
| } |
| VEC_free (varobj_p, var->children); |
| |
| /* if we were called to delete only the children we are done here. */ |
| if (only_children_p) |
| return; |
| |
| /* Otherwise, add it to the list of deleted ones and proceed to do so. */ |
| /* If the name is null, this is a temporary variable, that has not |
| yet been installed, don't report it, it belongs to the caller... */ |
| if (var->obj_name != NULL) |
| { |
| cppush (resultp, xstrdup (var->obj_name)); |
| *delcountp = *delcountp + 1; |
| } |
| |
| /* If this variable has a parent, remove it from its parent's list. */ |
| /* OPTIMIZATION: if the parent of this variable is also being deleted, |
| (as indicated by remove_from_parent_p) we don't bother doing an |
| expensive list search to find the element to remove when we are |
| discarding the list afterwards. */ |
| if ((remove_from_parent_p) && (var->parent != NULL)) |
| { |
| VEC_replace (varobj_p, var->parent->children, var->index, NULL); |
| } |
| |
| if (var->obj_name != NULL) |
| uninstall_variable (var); |
| |
| /* Free memory associated with this variable. */ |
| free_variable (var); |
| } |
| |
| /* Install the given variable VAR with the object name VAR->OBJ_NAME. */ |
| static int |
| 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; *chp; chp++) |
| { |
| index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| } |
| |
| cv = *(varobj_table + index); |
| while ((cv != NULL) && (strcmp (cv->var->obj_name, var->obj_name) != 0)) |
| cv = cv->next; |
| |
| if (cv != NULL) |
| error (_("Duplicate variable object name")); |
| |
| /* Add varobj to hash table. */ |
| newvl = xmalloc (sizeof (struct vlist)); |
| newvl->next = *(varobj_table + index); |
| newvl->var = var; |
| *(varobj_table + index) = newvl; |
| |
| /* 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 1; /* OK */ |
| } |
| |
| /* Unistall 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; *chp; chp++) |
| { |
| index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| } |
| |
| cv = *(varobj_table + index); |
| prev = NULL; |
| while ((cv != NULL) && (strcmp (cv->var->obj_name, var->obj_name) != 0)) |
| { |
| prev = cv; |
| cv = cv->next; |
| } |
| |
| if (varobjdebug) |
| fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name); |
| |
| if (cv == NULL) |
| { |
| warning |
| ("Assertion failed: Could not find variable object \"%s\" to delete", |
| var->obj_name); |
| 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); |
| return; |
| } |
| if (prer == NULL) |
| rootlist = NULL; |
| else |
| prer->next = cr->next; |
| } |
| } |
| |
| } |
| |
| /* Create and install a child of the parent of the given name. */ |
| static struct varobj * |
| create_child (struct varobj *parent, int index, char *name) |
| { |
| return create_child_with_value (parent, index, name, |
| value_of_child (parent, index)); |
| } |
| |
| static struct varobj * |
| create_child_with_value (struct varobj *parent, int index, char *name, |
| struct value *value) |
| { |
| struct varobj *child; |
| char *childs_name; |
| |
| child = new_variable (); |
| |
| /* NAME is allocated by caller. */ |
| child->name = name; |
| child->index = index; |
| child->parent = parent; |
| child->root = parent->root; |
| |
| if (varobj_is_anonymous_child (child)) |
| childs_name = xstrprintf ("%s.%d_anonymous", parent->obj_name, index); |
| else |
| childs_name = xstrprintf ("%s.%s", parent->obj_name, name); |
| child->obj_name = childs_name; |
| |
| install_variable (child); |
| |
| /* Compute the type of the child. Must do this before |
| calling install_new_value. */ |
| if (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 (value, 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, value, 1); |
| |
| return child; |
| } |
| |
| |
| /* |
| * Miscellaneous utility functions. |
| */ |
| |
| /* Allocate memory and initialize a new variable. */ |
| static struct varobj * |
| new_variable (void) |
| { |
| struct varobj *var; |
| |
| var = (struct varobj *) xmalloc (sizeof (struct varobj)); |
| var->name = NULL; |
| var->path_expr = NULL; |
| var->obj_name = NULL; |
| var->index = -1; |
| var->type = NULL; |
| var->value = NULL; |
| var->num_children = -1; |
| var->parent = NULL; |
| var->children = NULL; |
| var->format = 0; |
| var->root = NULL; |
| var->updated = 0; |
| var->print_value = NULL; |
| var->frozen = 0; |
| var->not_fetched = 0; |
| var->dynamic |
| = (struct varobj_dynamic *) xmalloc (sizeof (struct varobj_dynamic)); |
| var->dynamic->children_requested = 0; |
| var->from = -1; |
| var->to = -1; |
| var->dynamic->constructor = 0; |
| var->dynamic->pretty_printer = 0; |
| var->dynamic->child_iter = 0; |
| var->dynamic->saved_item = 0; |
| |
| return var; |
| } |
| |
| /* Allocate memory and initialize a new root variable. */ |
| static struct varobj * |
| new_root_variable (void) |
| { |
| struct varobj *var = new_variable (); |
| |
| var->root = (struct varobj_root *) xmalloc (sizeof (struct varobj_root)); |
| var->root->lang_ops = NULL; |
| var->root->exp = NULL; |
| var->root->valid_block = NULL; |
| var->root->frame = null_frame_id; |
| var->root->floating = 0; |
| var->root->rootvar = NULL; |
| var->root->is_valid = 1; |
| |
| return var; |
| } |
| |
| /* Free any allocated memory associated with VAR. */ |
| static void |
| free_variable (struct varobj *var) |
| { |
| #if HAVE_PYTHON |
| if (var->dynamic->pretty_printer != NULL) |
| { |
| struct cleanup *cleanup = varobj_ensure_python_env (var); |
| |
| Py_XDECREF (var->dynamic->constructor); |
| Py_XDECREF (var->dynamic->pretty_printer); |
| Py_XDECREF (var->dynamic->child_iter); |
| Py_XDECREF (var->dynamic->saved_item); |
| do_cleanups (cleanup); |
| } |
| #endif |
| |
| value_free (var->value); |
| |
| /* Free the expression if this is a root variable. */ |
| if (is_root_p (var)) |
| { |
| xfree (var->root->exp); |
| xfree (var->root); |
| } |
| |
| xfree (var->name); |
| xfree (var->obj_name); |
| xfree (var->print_value); |
| xfree (var->path_expr); |
| xfree (var->dynamic); |
| xfree (var); |
| } |
| |
| static void |
| do_free_variable_cleanup (void *var) |
| { |
| free_variable (var); |
| } |
| |
| static struct cleanup * |
| make_cleanup_free_variable (struct varobj *var) |
| { |
| return make_cleanup (do_free_variable_cleanup, var); |
| } |
| |
| /* Return the type of the value that's stored in VAR, |
| or that would have being stored there if the |
| value were accessible. |
| |
| This differs from VAR->type in that VAR->type is always |
| the true type of the expession in the source language. |
| The return value of this function is the type we're |
| actually storing in varobj, and using for displaying |
| the values and for comparing previous and new values. |
| |
| For example, top-level references are always stripped. */ |
| struct type * |
| varobj_get_value_type (struct varobj *var) |
| { |
| struct type *type; |
| |
| if (var->value) |
| type = value_type (var->value); |
| else |
| type = var->type; |
| |
| type = check_typedef (type); |
| |
| if (TYPE_CODE (type) == TYPE_CODE_REF) |
| type = get_target_type (type); |
| |
| type = check_typedef (type); |
| |
| return type; |
| } |
| |
| /* What is the default display for this variable? We assume that |
| everything is "natural". Any exceptions? */ |
| static enum varobj_display_formats |
| variable_default_display (struct varobj *var) |
| { |
| return FORMAT_NATURAL; |
| } |
| |
| /* FIXME: The following should be generic for any pointer. */ |
| static void |
| cppush (struct cpstack **pstack, char *name) |
| { |
| struct cpstack *s; |
| |
| s = (struct cpstack *) xmalloc (sizeof (struct cpstack)); |
| s->name = name; |
| s->next = *pstack; |
| *pstack = s; |
| } |
| |
| /* FIXME: The following should be generic for any pointer. */ |
| static char * |
| cppop (struct cpstack **pstack) |
| { |
| struct cpstack *s; |
| char *v; |
| |
| if ((*pstack)->name == NULL && (*pstack)->next == NULL) |
| return NULL; |
| |
| s = *pstack; |
| v = s->name; |
| *pstack = (*pstack)->next; |
| xfree (s); |
| |
| return v; |
| } |
| |
| /* |
| * Language-dependencies |
| */ |
| |
| /* Common entry points */ |
| |
| /* Return the number of children for a given variable. |
| The result of this function is defined by the language |
| implementation. The number of children returned by this function |
| is the number of children that the user will see in the variable |
| display. */ |
| static int |
| number_of_children (struct varobj *var) |
| { |
| return (*var->root->lang_ops->number_of_children) (var); |
| } |
| |
| /* What is the expression for the root varobj VAR? Returns a malloc'd |
| string. */ |
| static char * |
| name_of_variable (struct varobj *var) |
| { |
| return (*var->root->lang_ops->name_of_variable) (var); |
| } |
| |
| /* What is the name of the INDEX'th child of VAR? Returns a malloc'd |
| string. */ |
| static char * |
| name_of_child (struct varobj *var, int index) |
| { |
| return (*var->root->lang_ops->name_of_child) (var, index); |
| } |
| |
| /* If frame associated with VAR can be found, switch |
| to it and return 1. Otherwise, return 0. */ |
| |
| static int |
| check_scope (struct varobj *var) |
| { |
| struct frame_info *fi; |
| int scope; |
| |
| fi = frame_find_by_id (var->root->frame); |
| scope = fi != NULL; |
| |
| if (fi) |
| { |
| CORE_ADDR pc = get_frame_pc (fi); |
| |
| if (pc < BLOCK_START (var->root->valid_block) || |
| pc >= BLOCK_END (var->root->valid_block)) |
| scope = 0; |
| else |
| select_frame (fi); |
| } |
| return scope; |
| } |
| |
| /* Helper function to value_of_root. */ |
| |
| static struct value * |
| value_of_root_1 (struct varobj **var_handle) |
| { |
| struct value *new_val = NULL; |
| struct varobj *var = *var_handle; |
| int within_scope = 0; |
| struct cleanup *back_to; |
| |
| /* Only root variables can be updated... */ |
| if (!is_root_p (var)) |
| /* Not a root var. */ |
| return NULL; |
| |
| back_to = make_cleanup_restore_current_thread (); |
| |
| /* Determine whether the variable is still around. */ |
| if (var->root->valid_block == NULL || var->root->floating) |
| within_scope = 1; |
| else if (var->root->thread_id == 0) |
| { |
| /* The program was single-threaded when the variable object was |
| created. Technically, it's possible that the program became |
| multi-threaded since then, but we don't support such |
| scenario yet. */ |
| within_scope = check_scope (var); |
| } |
| else |
| { |
| ptid_t ptid = thread_id_to_pid (var->root->thread_id); |
| if (in_thread_list (ptid)) |
| { |
| switch_to_thread (ptid); |
| within_scope = check_scope (var); |
| } |
| } |
| |
| if (within_scope) |
| { |
| volatile struct gdb_exception except; |
| |
| /* We need to catch errors here, because if evaluate |
| expression fails we want to just return NULL. */ |
| TRY_CATCH (except, RETURN_MASK_ERROR) |
| { |
| new_val = evaluate_expression (var->root->exp); |
| } |
| } |
| |
| do_cleanups (back_to); |
| |
| return new_val; |
| } |
| |
| /* What is the ``struct value *'' of the root variable VAR? |
| For floating variable object, evaluation can get us a value |
| of different type from what is stored in varobj already. In |
| that case: |
| - *type_changed will be set to 1 |
| - old varobj will be freed, and new one will be |
| created, with the same name. |
| - *var_handle will be set to the new varobj |
| Otherwise, *type_changed will be set to 0. */ |
| static struct value * |
| value_of_root (struct varobj **var_handle, int *type_changed) |
| { |
| struct varobj *var; |
| |
| if (var_handle == NULL) |
| return NULL; |
| |
| var = *var_handle; |
| |
| /* This should really be an exception, since this should |
| only get called with a root variable. */ |
| |
| if (!is_root_p (var)) |
| return NULL; |
| |
| if (var->root->floating) |
| { |
| struct varobj *tmp_var; |
| char *old_type, *new_type; |
| |
| tmp_var = varobj_create (NULL, var->name, (CORE_ADDR) 0, |
| USE_SELECTED_FRAME); |
| if (tmp_var == NULL) |
| { |
| return NULL; |
| } |
| old_type = varobj_get_type (var); |
| new_type = varobj_get_type (tmp_var); |
| if (strcmp (old_type, new_type) == 0) |
| { |
| /* The expression presently stored inside var->root->exp |
| remembers the locations of local variables relatively to |
| the frame where the expression was created (in DWARF location |
| button, for example). Naturally, those locations are not |
| correct in other frames, so update the expression. */ |
| |
| struct expression *tmp_exp = var->root->exp; |
| |
| var->root->exp = tmp_var->root->exp; |
| tmp_var->root->exp = tmp_exp; |
| |
| varobj_delete (tmp_var, NULL, 0); |
| *type_changed = 0; |
| } |
| else |
| { |
| tmp_var->obj_name = xstrdup (var->obj_name); |
| tmp_var->from = var->from; |
| tmp_var->to = var->to; |
| varobj_delete (var, NULL, 0); |
| |
| install_variable (tmp_var); |
| *var_handle = tmp_var; |
| var = *var_handle; |
| *type_changed = 1; |
| } |
| xfree (old_type); |
| xfree (new_type); |
| } |
| else |
| { |
| *type_changed = 0; |
| } |
| |
| { |
| struct value *value; |
| |
| value = value_of_root_1 (var_handle); |
| if (var->value == NULL || value == NULL) |
| { |
| /* For root varobj-s, a NULL value indicates a scoping issue. |
| So, nothing to do in terms of checking for mutations. */ |
| } |
| else if (varobj_value_has_mutated (var, value, value_type (value))) |
| { |
| /* The type has mutated, so the children are no longer valid. |
| Just delete them, and tell our caller that the type has |
| changed. */ |
| varobj_delete (var, NULL, 1 /* only_children */); |
| var->num_children = -1; |
| var->to = -1; |
| var->from = -1; |
| *type_changed = 1; |
| } |
| return value; |
| } |
| } |
| |
| /* What is the ``struct value *'' for the INDEX'th child of PARENT? */ |
| static struct value * |
| value_of_child (struct varobj *parent, int index) |
| { |
| struct value *value; |
| |
| value = (*parent->root->lang_ops->value_of_child) (parent, index); |
| |
| return value; |
| } |
| |
| /* GDB already has a command called "value_of_variable". Sigh. */ |
| static char * |
| my_value_of_variable (struct varobj *var, enum varobj_display_formats format) |
| { |
| if (var->root->is_valid) |
| { |
| if (var->dynamic->pretty_printer != NULL) |
| return varobj_value_get_print_value (var->value, var->format, var); |
| return (*var->root->lang_ops->value_of_variable) (var, format); |
| } |
| else |
| return NULL; |
| } |
| |
| void |
| varobj_formatted_print_options (struct value_print_options *opts, |
| enum varobj_display_formats format) |
| { |
| get_formatted_print_options (opts, format_code[(int) format]); |
| opts->deref_ref = 0; |
| opts->raw = 1; |
| } |
| |
| char * |
| varobj_value_get_print_value (struct value *value, |
| enum varobj_display_formats format, |
| struct varobj *var) |
| { |
| struct ui_file *stb; |
| struct cleanup *old_chain; |
| char *thevalue = NULL; |
| struct value_print_options opts; |
| struct type *type = NULL; |
| long len = 0; |
| char *encoding = NULL; |
| struct gdbarch *gdbarch = NULL; |
| /* Initialize it just to avoid a GCC false warning. */ |
| CORE_ADDR str_addr = 0; |
| int string_print = 0; |
| |
| if (value == NULL) |
| return NULL; |
| |
| stb = mem_fileopen (); |
| old_chain = make_cleanup_ui_file_delete (stb); |
| |
| gdbarch = get_type_arch (value_type (value)); |
| #if HAVE_PYTHON |
| if (gdb_python_initialized) |
| { |
| PyObject *value_formatter = var->dynamic->pretty_printer; |
| |
| varobj_ensure_python_env (var); |
| |
| if (value_formatter) |
| { |
| /* First check to see if we have any children at all. If so, |
| we simply return {...}. */ |
| if (dynamic_varobj_has_child_method (var)) |
| { |
| do_cleanups (old_chain); |
| return xstrdup ("{...}"); |
| } |
| |
| if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst)) |
| { |
| struct value *replacement; |
| PyObject *output = NULL; |
| |
| output = apply_varobj_pretty_printer (value_formatter, |
| &replacement, |
| stb); |
| |
| /* If we have string like output ... */ |
| if (output) |
| { |
| make_cleanup_py_decref (output); |
| |
| /* If this is a lazy string, extract it. For lazy |
| strings we always print as a string, so set |
| string_print. */ |
| if (gdbpy_is_lazy_string (output)) |
| { |
| gdbpy_extract_lazy_string (output, &str_addr, &type, |
| &len, &encoding); |
| make_cleanup (free_current_contents, &encoding); |
| string_print = 1; |
| } |
| else |
| { |
| /* If it is a regular (non-lazy) string, extract |
| it and copy the contents into THEVALUE. If the |
| hint says to print it as a string, set |
| string_print. Otherwise just return the extracted |
| string as a value. */ |
| |
| char *s = python_string_to_target_string (output); |
| |
| if (s) |
| { |
| char *hint; |
| |
| hint = gdbpy_get_display_hint (value_formatter); |
| if (hint) |
| { |
| if (!strcmp (hint, "string")) |
| string_print = 1; |
| xfree (hint); |
| } |
| |
| len = strlen (s); |
| thevalue = xmemdup (s, len + 1, len + 1); |
| type = builtin_type (gdbarch)->builtin_char; |
| xfree (s); |
| |
| if (!string_print) |
| { |
| do_cleanups (old_chain); |
| return thevalue; |
| } |
| |
| make_cleanup (xfree, thevalue); |
| } |
| else |
| gdbpy_print_stack (); |
| } |
| } |
| /* If the printer returned a replacement value, set VALUE |
| to REPLACEMENT. If there is not a replacement value, |
| just use the value passed to this function. */ |
| if (replacement) |
| value = replacement; |
| } |
| } |
| } |
| #endif |
| |
| varobj_formatted_print_options (&opts, format); |
| |
| /* If the THEVALUE has contents, it is a regular string. */ |
| if (thevalue) |
| LA_PRINT_STRING (stb, type, (gdb_byte *) thevalue, len, encoding, 0, &opts); |
| else if (string_print) |
| /* Otherwise, if string_print is set, and it is not a regular |
| string, it is a lazy string. */ |
| val_print_string (type, encoding, str_addr, len, stb, &opts); |
| else |
| /* All other cases. */ |
| common_val_print (value, stb, 0, &opts, current_language); |
| |
| thevalue = ui_file_xstrdup (stb, NULL); |
| |
| do_cleanups (old_chain); |
| return thevalue; |
| } |
| |
| int |
| varobj_editable_p (struct varobj *var) |
| { |
| struct type *type; |
| |
| if (!(var->root->is_valid && var->value && VALUE_LVAL (var->value))) |
| return 0; |
| |
| type = varobj_get_value_type (var); |
| |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_STRUCT: |
| case TYPE_CODE_UNION: |
| case TYPE_CODE_ARRAY: |
| case TYPE_CODE_FUNC: |
| case TYPE_CODE_METHOD: |
| return 0; |
| break; |
| |
| default: |
| return 1; |
| break; |
| } |
| } |
| |
| /* Call VAR's value_is_changeable_p language-specific callback. */ |
| |
| int |
| varobj_value_is_changeable_p (struct varobj *var) |
| { |
| return var->root->lang_ops->value_is_changeable_p (var); |
| } |
| |
| /* Return 1 if that varobj is floating, that is is always evaluated in the |
| selected frame, and not bound to thread/frame. Such variable objects |
| are created using '@' as frame specifier to -var-create. */ |
| int |
| varobj_floating_p (struct varobj *var) |
| { |
| return var->root->floating; |
| } |
| |
| /* Implement the "value_is_changeable_p" varobj callback for most |
| languages. */ |
| |
| int |
| varobj_default_value_is_changeable_p (struct varobj *var) |
| { |
| int r; |
| struct type *type; |
| |
| if (CPLUS_FAKE_CHILD (var)) |
| return 0; |
| |
| type = varobj_get_value_type (var); |
| |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_STRUCT: |
| case TYPE_CODE_UNION: |
| case TYPE_CODE_ARRAY: |
| r = 0; |
| break; |
| |
| default: |
| r = 1; |
| } |
| |
| return r; |
| } |
| |
| /* Iterate all the existing _root_ VAROBJs and call the FUNC callback for them |
| with an arbitrary caller supplied DATA pointer. */ |
| |
| void |
| all_root_varobjs (void (*func) (struct varobj *var, void *data), void *data) |
| { |
| 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) |
| { |
| var_root_next = var_root->next; |
| |
| (*func) (var_root->rootvar, data); |
| } |
| } |
| |
| extern void _initialize_varobj (void); |
| void |
| _initialize_varobj (void) |
| { |
| int sizeof_table = sizeof (struct vlist *) * VAROBJ_TABLE_SIZE; |
| |
| varobj_table = xmalloc (sizeof_table); |
| memset (varobj_table, 0, sizeof_table); |
| |
| add_setshow_zuinteger_cmd ("debugvarobj", class_maintenance, |
| &varobjdebug, |
| _("Set varobj debugging."), |
| _("Show varobj debugging."), |
| _("When non-zero, varobj debugging is enabled."), |
| NULL, show_varobjdebug, |
| &setlist, &showlist); |
| } |
| |
| /* Invalidate varobj VAR if it is tied to locals and re-create it if it is |
| defined on globals. It is a helper for varobj_invalidate. |
| |
| This function is called after changing the symbol file, in this case the |
| pointers to "struct type" stored by the varobj are no longer valid. All |
| varobj must be either re-evaluated, or marked as invalid here. */ |
| |
| static void |
| varobj_invalidate_iter (struct varobj *var, void *unused) |
| { |
| /* global and floating var must be re-evaluated. */ |
| if (var->root->floating || var->root->valid_block == NULL) |
| { |
| struct varobj *tmp_var; |
| |
| /* Try to create a varobj with same expression. If we succeed |
| replace the old varobj, otherwise invalidate it. */ |
| tmp_var = varobj_create (NULL, var->name, (CORE_ADDR) 0, |
| USE_CURRENT_FRAME); |
| if (tmp_var != NULL) |
| { |
| tmp_var->obj_name = xstrdup (var->obj_name); |
| varobj_delete (var, NULL, 0); |
| install_variable (tmp_var); |
| } |
| else |
| var->root->is_valid = 0; |
| } |
| else /* locals must be invalidated. */ |
| var->root->is_valid = 0; |
| } |
| |
| /* Invalidate the varobjs that are tied to locals and re-create the ones that |
| are defined on globals. |
| Invalidated varobjs will be always printed in_scope="invalid". */ |
| |
| void |
| varobj_invalidate (void) |
| { |
| all_root_varobjs (varobj_invalidate_iter, NULL); |
| } |