From 575bbeb6ee26c1636794bcd1b3122e485415da58 Mon Sep 17 00:00:00 2001 From: Keith Seitz Date: Sun, 13 Jan 2002 20:17:55 +0000 Subject: [PATCH] * varobj.c (varobj_set_value): Make sure that there were no errors evaluating the object before attempting to set its value. value_cast now properly adjusts VALUE_ADDRESS for baseclasses, so this offset adjustment is no longer necessary. (create_child): Don't set the error flag if the child is a CPLUS_FAKE_CHILD. (value_of_child): If value_fetch_lazy fails, return NULL so that callers will be notified that an error occurred. (c_value_of_variable): Delay check of variable's validity until later. We actually want all structs and unions to have the value "{...}". Do not return "???" for variables which could not be evaluated. This error condition must be returned to the caller so that it can get the error condition from gdb. (cplus_name_of_child): Adjust index for vptr before figuring out the name of the child. (cplus_value_of_child): If a child's (real) parent is not valid, don't even bother trying to give a value for it. Just return an error. Change all instances in this function. (cplus_type_of_child): If our parent is one of the "fake" parents, we need to get at the type of the real parent, and derive the child's true type using this information. --- gdb/ChangeLog | 26 ++++++++++++ gdb/varobj.c | 130 ++++++++++++++++++++++++++++++---------------------------- 2 files changed, 94 insertions(+), 62 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index adf8403..9099360 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,29 @@ +2002-01-13 Keith Seitz + + * varobj.c (varobj_set_value): Make sure that there were no + errors evaluating the object before attempting to set its + value. + value_cast now properly adjusts VALUE_ADDRESS for baseclasses, + so this offset adjustment is no longer necessary. + (create_child): Don't set the error flag if the child is + a CPLUS_FAKE_CHILD. + (value_of_child): If value_fetch_lazy fails, return NULL + so that callers will be notified that an error occurred. + (c_value_of_variable): Delay check of variable's validity + until later. We actually want all structs and unions to have + the value "{...}". + Do not return "???" for variables which could not be evaluated. + This error condition must be returned to the caller so that it + can get the error condition from gdb. + (cplus_name_of_child): Adjust index for vptr before figuring + out the name of the child. + (cplus_value_of_child): If a child's (real) parent is not valid, + don't even bother trying to give a value for it. Just return + an error. Change all instances in this function. + (cplus_type_of_child): If our parent is one of the "fake" + parents, we need to get at the type of the real parent, and + derive the child's true type using this information. + 2002-01-13 Andrew Cagney From 2002-01-09 John Marshall : diff --git a/gdb/varobj.c b/gdb/varobj.c index 4cf6204..f56b7aa 100644 --- a/gdb/varobj.c +++ b/gdb/varobj.c @@ -761,11 +761,10 @@ varobj_set_value (struct varobj *var, char *expression) struct value *value; int saved_input_radix = input_radix; - if (variable_editable (var) && !var->error) + if (var->value != NULL && variable_editable (var) && !var->error) { char *s = expression; int i; - struct value *temp; input_radix = 10; /* ALWAYS reset to decimal temporarily */ if (!gdb_parse_exp_1 (&s, 0, 0, &exp)) @@ -778,36 +777,8 @@ varobj_set_value (struct varobj *var, char *expression) return 0; } - /* If our parent is "public", "private", or "protected", we could - be asking to modify the value of a baseclass. If so, we need to - adjust our address by the offset of our baseclass in the subclass, - since VALUE_ADDRESS (var->value) points at the start of the subclass. - For some reason, value_cast doesn't take care of this properly. */ - temp = var->value; - if (var->parent != NULL && CPLUS_FAKE_CHILD (var->parent)) - { - struct varobj *super, *sub; - struct type *type; - super = var->parent->parent; - sub = super->parent; - if (sub != NULL) - { - /* Yes, it is a baseclass */ - type = get_type_deref (sub); - - if (super->index < TYPE_N_BASECLASSES (type)) - { - temp = value_copy (var->value); - for (i = 0; i < super->index; i++) - offset += TYPE_LENGTH (TYPE_FIELD_TYPE (type, i)); - } - } - } - - VALUE_ADDRESS (temp) += offset; - if (!gdb_value_assign (temp, value, &val)) + if (!gdb_value_assign (var->value, value, &val)) return 0; - VALUE_ADDRESS (val) -= offset; value_free (var->value); release_value (val); var->value = val; @@ -1239,7 +1210,7 @@ create_child (struct varobj *parent, int index, char *name) child->name = name; child->index = index; child->value = value_of_child (parent, index); - if (child->value == NULL || parent->error) + if ((!CPLUS_FAKE_CHILD(child) && child->value == NULL) || parent->error) child->error = 1; child->parent = parent; child->root = parent->root; @@ -1672,7 +1643,13 @@ value_of_child (struct varobj *parent, int index) /* If we're being lazy, fetch the real value of the variable. */ if (value != NULL && VALUE_LAZY (value)) - gdb_value_fetch_lazy (value); + { + /* If we fail to fetch the value of the child, return + NULL so that callers notice that we're leaving an + error message. */ + if (!gdb_value_fetch_lazy (value)) + value = NULL; + } return value; } @@ -2048,16 +2025,6 @@ static char * c_value_of_variable (struct varobj *var) { struct type *type; - struct value *val; - - if (var->value != NULL) - val = var->value; - else - { - /* This can happen if we attempt to get the value of a struct - member when the parent is an invalid pointer. */ - return xstrdup ("???"); - } /* BOGUS: if val_print sees a struct/class, it will print out its children instead of "{...}" */ @@ -2084,13 +2051,24 @@ c_value_of_variable (struct varobj *var) struct cleanup *old_chain = make_cleanup_ui_file_delete (stb); char *thevalue; - if (VALUE_LAZY (val)) - gdb_value_fetch_lazy (val); - val_print (VALUE_TYPE (val), VALUE_CONTENTS_RAW (val), 0, - VALUE_ADDRESS (val), - stb, format_code[(int) var->format], 1, 0, 0); - thevalue = ui_file_xstrdup (stb, &dummy); - do_cleanups (old_chain); + if (var->value == NULL) + { + /* This can happen if we attempt to get the value of a struct + member when the parent is an invalid pointer. This is an + error condition, so we should tell the caller. */ + return NULL; + } + else + { + if (VALUE_LAZY (var->value)) + gdb_value_fetch_lazy (var->value); + val_print (VALUE_TYPE (var->value), VALUE_CONTENTS_RAW (var->value), 0, + VALUE_ADDRESS (var->value), + stb, format_code[(int) var->format], 1, 0, 0); + thevalue = ui_file_xstrdup (stb, &dummy); + do_cleanups (old_chain); + } + return thevalue; } /* break; */ @@ -2212,11 +2190,17 @@ cplus_name_of_child (struct varobj *parent, int index) if (CPLUS_FAKE_CHILD (parent)) { + int i; + + /* Skip over vptr, if it exists. */ + if (TYPE_VPTR_BASETYPE (type) == type + && index >= TYPE_VPTR_FIELDNO (type)) + index++; + /* FIXME: This assumes that type orders inherited, public, private, protected */ - int i = index + TYPE_N_BASECLASSES (type); - if (STREQ (parent->name, "private") - || STREQ (parent->name, "protected")) + i = index + TYPE_N_BASECLASSES (type); + if (STREQ (parent->name, "private") || STREQ (parent->name, "protected")) i += children[v_public]; if (STREQ (parent->name, "protected")) i += children[v_private]; @@ -2299,6 +2283,9 @@ cplus_value_of_child (struct varobj *parent, int index) char *name; struct value *temp = parent->parent->value; + if (temp == NULL) + return NULL; + name = name_of_child (parent, index); gdb_value_struct_elt (NULL, &value, &temp, NULL, name, NULL, "cplus_structure"); @@ -2317,7 +2304,7 @@ cplus_value_of_child (struct varobj *parent, int index) /* Baseclass */ if (parent->value != NULL) { - struct value *temp; + struct value *temp = NULL; if (TYPE_CODE (VALUE_TYPE (parent->value)) == TYPE_CODE_PTR || TYPE_CODE (VALUE_TYPE (parent->value)) == TYPE_CODE_REF) @@ -2328,8 +2315,17 @@ cplus_value_of_child (struct varobj *parent, int index) else temp = parent->value; - value = value_cast (TYPE_FIELD_TYPE (type, index), temp); - release_value (value); + if (temp != NULL) + { + value = value_cast (TYPE_FIELD_TYPE (type, index), temp); + release_value (value); + } + else + { + /* We failed to evaluate the parent's value, so don't even + bother trying to evaluate this child. */ + return NULL; + } } } } @@ -2345,21 +2341,31 @@ cplus_type_of_child (struct varobj *parent, int index) { struct type *type, *t; - t = get_type_deref (parent); + if (CPLUS_FAKE_CHILD (parent)) + { + /* Looking for the type of a child of public, private, or protected. */ + t = get_type_deref (parent->parent); + } + else + t = get_type_deref (parent); + type = NULL; switch (TYPE_CODE (t)) { case TYPE_CODE_STRUCT: case TYPE_CODE_UNION: - if (index >= TYPE_N_BASECLASSES (t)) + if (CPLUS_FAKE_CHILD (parent)) { - /* special */ - return NULL; + char *name = cplus_name_of_child (parent, index); + type = lookup_struct_elt_type (t, name, 0); + xfree (name); } + else if (index < TYPE_N_BASECLASSES (t)) + type = TYPE_FIELD_TYPE (t, index); else { - /* Baseclass */ - type = TYPE_FIELD_TYPE (t, index); + /* special */ + return NULL; } break; -- 2.7.4