359 lines
12 KiB
C++
359 lines
12 KiB
C++
/* GDB variable objects API.
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef VAROBJ_H
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#define VAROBJ_H 1
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "value.h"
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/* Enumeration for the format types */
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enum varobj_display_formats
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{
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FORMAT_NATURAL, /* What gdb actually calls 'natural' */
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FORMAT_BINARY, /* Binary display */
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FORMAT_DECIMAL, /* Decimal display */
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FORMAT_HEXADECIMAL, /* Hex display */
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FORMAT_OCTAL, /* Octal display */
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FORMAT_ZHEXADECIMAL /* Zero padded hexadecimal */
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};
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enum varobj_type
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{
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USE_SPECIFIED_FRAME, /* Use the frame passed to varobj_create. */
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USE_CURRENT_FRAME, /* Use the current frame. */
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USE_SELECTED_FRAME /* Always reevaluate in selected frame. */
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};
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/* Enumerator describing if a variable object is in scope. */
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enum varobj_scope_status
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{
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VAROBJ_IN_SCOPE = 0, /* Varobj is scope, value available. */
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VAROBJ_NOT_IN_SCOPE = 1, /* Varobj is not in scope, value not
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available, but varobj can become in
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scope later. */
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VAROBJ_INVALID = 2, /* Varobj no longer has any value, and never
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will. */
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};
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/* String representations of gdb's format codes (defined in varobj.c). */
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extern const char *varobj_format_string[];
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/* Struct that describes a variable object instance. */
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struct varobj;
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struct varobj_update_result
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{
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varobj_update_result (struct varobj *varobj_,
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varobj_scope_status status_ = VAROBJ_IN_SCOPE)
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: varobj (varobj_), status (status_)
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{}
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varobj_update_result (varobj_update_result &&other) = default;
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DISABLE_COPY_AND_ASSIGN (varobj_update_result);
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struct varobj *varobj;
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bool type_changed = false;
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bool children_changed = false;
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bool changed = false;
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enum varobj_scope_status status;
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/* This variable is used internally by varobj_update to indicate if the
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new value of varobj is already computed and installed, or has to
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be yet installed. Don't use this outside varobj.c. */
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bool value_installed = false;
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/* This will be non-NULL when new children were added to the varobj.
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It lists the new children (which must necessarily come at the end
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of the child list) added during an update. The caller is
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responsible for freeing this vector. */
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std::vector<struct varobj *> newobj;
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};
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struct varobj_root;
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struct varobj_dynamic;
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/* Every variable in the system has a structure of this type defined
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for it. This structure holds all information necessary to manipulate
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a particular object variable. */
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struct varobj
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{
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explicit varobj (varobj_root *root_);
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~varobj ();
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/* Name of the variable for this object. If this variable is a
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child, then this name will be the child's source name.
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(bar, not foo.bar). */
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/* NOTE: This is the "expression". */
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std::string name;
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/* Expression for this child. Can be used to create a root variable
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corresponding to this child. */
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std::string path_expr;
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/* The name for this variable's object. This is here for
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convenience when constructing this object's children. */
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std::string obj_name;
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/* Index of this variable in its parent or -1. */
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int index = -1;
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/* The type of this variable. This can be NULL
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for artificial variable objects -- currently, the "accessibility"
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variable objects in C++. */
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struct type *type = NULL;
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/* The value of this expression or subexpression. A NULL value
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indicates there was an error getting this value.
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Invariant: if varobj_value_is_changeable_p (this) is non-zero,
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the value is either NULL, or not lazy. */
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value_ref_ptr value;
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/* The number of (immediate) children this variable has. */
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int num_children = -1;
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/* If this object is a child, this points to its immediate parent. */
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struct varobj *parent = NULL;
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/* Children of this object. */
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std::vector<varobj *> children;
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/* Description of the root variable. Points to root variable for
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children. */
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struct varobj_root *root;
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/* The format of the output for this object. */
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enum varobj_display_formats format = FORMAT_NATURAL;
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/* Was this variable updated via a varobj_set_value operation. */
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bool updated = false;
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/* Last print value. */
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std::string print_value;
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/* Is this variable frozen. Frozen variables are never implicitly
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updated by -var-update *
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or -var-update <direct-or-indirect-parent>. */
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bool frozen = false;
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/* Is the value of this variable intentionally not fetched? It is
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not fetched if either the variable is frozen, or any parents is
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frozen. */
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bool not_fetched = false;
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/* Sub-range of children which the MI consumer has requested. If
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FROM < 0 or TO < 0, means that all children have been
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requested. */
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int from = -1;
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int to = -1;
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/* Dynamic part of varobj. */
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struct varobj_dynamic *dynamic;
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};
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/* Is the variable X one of our "fake" children? */
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#define CPLUS_FAKE_CHILD(x) \
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((x) != NULL && (x)->type == NULL && (x)->value == NULL)
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/* The language specific vector */
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struct lang_varobj_ops
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{
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/* The number of children of PARENT. */
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int (*number_of_children) (const struct varobj *parent);
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/* The name (expression) of a root varobj. */
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std::string (*name_of_variable) (const struct varobj *parent);
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/* The name of the INDEX'th child of PARENT. */
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std::string (*name_of_child) (const struct varobj *parent, int index);
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/* Returns the rooted expression of CHILD, which is a variable
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obtain that has some parent. */
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std::string (*path_expr_of_child) (const struct varobj *child);
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/* The ``struct value *'' of the INDEX'th child of PARENT. */
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struct value *(*value_of_child) (const struct varobj *parent, int index);
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/* The type of the INDEX'th child of PARENT. */
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struct type *(*type_of_child) (const struct varobj *parent, int index);
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/* The current value of VAR. */
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std::string (*value_of_variable) (const struct varobj *var,
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enum varobj_display_formats format);
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/* Return true if changes in value of VAR must be detected and
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reported by -var-update. Return false if -var-update should never
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report changes of such values. This makes sense for structures
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(since the changes in children values will be reported separately),
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or for artificial objects (like 'public' pseudo-field in C++).
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Return value of false means that gdb need not call value_fetch_lazy
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for the value of this variable object. */
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bool (*value_is_changeable_p) (const struct varobj *var);
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/* Return true if the type of VAR has mutated.
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VAR's value is still the varobj's previous value, while NEW_VALUE
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is VAR's new value and NEW_TYPE is the var's new type. NEW_VALUE
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may be NULL indicating that there is no value available (the varobj
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may be out of scope, of may be the child of a null pointer, for
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instance). NEW_TYPE, on the other hand, must never be NULL.
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This function should also be able to assume that var's number of
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children is set (not < 0).
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Languages where types do not mutate can set this to NULL. */
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bool (*value_has_mutated) (const struct varobj *var, struct value *new_value,
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struct type *new_type);
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/* Return true if VAR is a suitable path expression parent.
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For C like languages with anonymous structures and unions an anonymous
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structure or union is not a suitable parent. */
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bool (*is_path_expr_parent) (const struct varobj *var);
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};
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extern const struct lang_varobj_ops c_varobj_ops;
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extern const struct lang_varobj_ops cplus_varobj_ops;
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extern const struct lang_varobj_ops ada_varobj_ops;
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#define default_varobj_ops c_varobj_ops
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/* Non-zero if we want to see trace of varobj level stuff. */
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extern unsigned int varobjdebug;
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/* API functions */
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extern struct varobj *varobj_create (const char *objname,
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const char *expression, CORE_ADDR frame,
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enum varobj_type type);
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extern std::string varobj_gen_name (void);
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extern struct varobj *varobj_get_handle (const char *name);
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extern const char *varobj_get_objname (const struct varobj *var);
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extern std::string varobj_get_expression (const struct varobj *var);
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/* Delete a varobj and all its children if only_children is false, otherwise
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delete only the children. Return the number of deleted variables. */
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extern int varobj_delete (struct varobj *var, bool only_children);
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extern enum varobj_display_formats varobj_set_display_format (
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struct varobj *var,
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enum varobj_display_formats format);
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extern enum varobj_display_formats varobj_get_display_format (
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const struct varobj *var);
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extern int varobj_get_thread_id (const struct varobj *var);
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extern void varobj_set_frozen (struct varobj *var, bool frozen);
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extern bool varobj_get_frozen (const struct varobj *var);
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extern void varobj_get_child_range (const struct varobj *var, int *from,
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int *to);
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extern void varobj_set_child_range (struct varobj *var, int from, int to);
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extern gdb::unique_xmalloc_ptr<char>
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varobj_get_display_hint (const struct varobj *var);
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extern int varobj_get_num_children (struct varobj *var);
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/* Return the list of children of VAR. The returned vector should not
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be modified in any way. FROM and TO are in/out parameters
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indicating the range of children to return. If either *FROM or *TO
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is less than zero on entry, then all children will be returned. On
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return, *FROM and *TO will be updated to indicate the real range
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that was returned. The resulting vector will contain at least the
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children from *FROM to just before *TO; it might contain more
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children, depending on whether any more were available. */
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extern const std::vector<varobj *> &
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varobj_list_children (struct varobj *var, int *from, int *to);
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extern std::string varobj_get_type (struct varobj *var);
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extern struct type *varobj_get_gdb_type (const struct varobj *var);
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extern const char *varobj_get_path_expr (const struct varobj *var);
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extern const struct language_defn *
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varobj_get_language (const struct varobj *var);
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extern int varobj_get_attributes (const struct varobj *var);
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extern std::string
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varobj_get_formatted_value (struct varobj *var,
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enum varobj_display_formats format);
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extern std::string varobj_get_value (struct varobj *var);
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extern bool varobj_set_value (struct varobj *var, const char *expression);
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extern void all_root_varobjs (void (*func) (struct varobj *var, void *data),
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void *data);
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extern std::vector<varobj_update_result>
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varobj_update (struct varobj **varp, bool is_explicit);
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extern void varobj_invalidate (void);
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extern bool varobj_editable_p (const struct varobj *var);
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extern bool varobj_floating_p (const struct varobj *var);
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extern void varobj_set_visualizer (struct varobj *var,
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const char *visualizer);
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extern void varobj_enable_pretty_printing (void);
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extern bool varobj_has_more (const struct varobj *var, int to);
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extern bool varobj_is_dynamic_p (const struct varobj *var);
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extern bool varobj_default_value_is_changeable_p (const struct varobj *var);
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extern bool varobj_value_is_changeable_p (const struct varobj *var);
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extern struct type *varobj_get_value_type (const struct varobj *var);
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extern bool varobj_is_anonymous_child (const struct varobj *child);
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extern const struct varobj *
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varobj_get_path_expr_parent (const struct varobj *var);
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extern std::string
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varobj_value_get_print_value (struct value *value,
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enum varobj_display_formats format,
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const struct varobj *var);
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extern void varobj_formatted_print_options (struct value_print_options *opts,
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enum varobj_display_formats format);
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extern void varobj_restrict_range (const std::vector<varobj *> &children,
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int *from, int *to);
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extern bool varobj_default_is_path_expr_parent (const struct varobj *var);
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#endif /* VAROBJ_H */
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