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Re: [rfa] Make get_number_or_range accept value history references
- From: Michael Snyder <msnyder at vmware dot com>
- To: Pedro Alves <pedro at codesourcery dot com>
- Cc: "gdb-patches at sourceware dot org" <gdb-patches at sourceware dot org>
- Date: Fri, 25 Feb 2011 13:45:39 -0800
- Subject: Re: [rfa] Make get_number_or_range accept value history references
- References: <4D66AD46.204@vmware.com> <201102251155.57072.pedro@codesourcery.com>
Pedro Alves wrote:
On Thursday 24 February 2011 19:11:02, Michael Snyder wrote:
+ if (isdigit (h[1]) || h[1] == '\0' || h[1] == ' ' || h[1] == '\t')
+ /* single-dollar history value */
+ index = strtol (&h[1], endp, 10);
Is this correct for the ' ' and '\t' cases? It looks
like it will accept "$ 3" as history value 3, but
it should parsed as "$" -- the last history value.
You're also not checking if the string is all
digits, so $123asdf is being accepted as $123, while
the language parsers treat that as an internal
variable. Maybe you should take a look at write_dollar_variable,
and factor out or borrow code from there to avoid these
discrepancies?
+ else if (h[1] == '$'
+ && (isdigit (h[2]) || h[2] == '\0'
+ || h[2] == ' ' || h[2] == '\t'))
+ /* double-dollar history value */
+ index = -strtol (&h[2], endp, 10);
OK, a major re-write! ;-)
2011-02-24 Michael Snyder <msnyder@vmware.com>
* value.c (value_from_history_ref): New function.
* value.h (value_from_history_ref): Export.
* cli/cli-utils.c (get_number_trailer): Use value_from_history_ref
to parse value history references.
* cli/cli-utils.h (get_number_trailer): Update comment.
2011-02-24 Michael Snyder <msnyder@vmware.com>
* gdb.base/break.exp: Add tests for delete breakpoints using
convenience variables and value history references.
Index: value.c
===================================================================
RCS file: /cvs/src/src/gdb/value.c,v
retrieving revision 1.138
diff -u -p -u -p -r1.138 value.c
--- value.c 16 Feb 2011 11:55:59 -0000 1.138
+++ value.c 25 Feb 2011 21:43:23 -0000
@@ -41,7 +41,7 @@
#include "cli/cli-decode.h"
#include "exceptions.h"
#include "python/python.h"
-
+#include <ctype.h>
#include "tracepoint.h"
/* Prototypes for exported functions. */
@@ -2991,6 +2991,59 @@ value_from_decfloat (struct type *type,
return val;
}
+/* Extract a value from the history file. Input will be of the form
+ $digits or $$digits. See block comment above 'write_dollar_variable'
+ for details. */
+
+struct value *
+value_from_history_ref (char *h, char **endp)
+{
+ int index, len;
+
+ if (h[0] == '$')
+ len = 1;
+ else
+ return NULL;
+
+ if (h[1] == '$')
+ len = 2;
+
+ /* Find length of numeral string. */
+ for (; isdigit (h[len]); len++)
+ ;
+
+ /* Make sure numeral string is not part of an identifier. */
+ if (h[len] == '_' || isalpha (h[len]))
+ return NULL;
+
+ /* Now collect the index value. */
+ if (h[1] == '$')
+ {
+ if (len == 2)
+ {
+ /* For some bizarre reason, "$$" is equivalent to "$$1",
+ rather than to "$$0" as it ought to be! */
+ index = -1;
+ *endp += len;
+ }
+ else
+ index = -strtol (&h[2], endp, 10);
+ }
+ else
+ {
+ if (len == 1)
+ {
+ /* "$" is equivalent to "$0". */
+ index = 0;
+ *endp += len;
+ }
+ else
+ index = strtol (&h[1], endp, 10);
+ }
+
+ return access_value_history (index);
+}
+
struct value *
coerce_ref (struct value *arg)
{
Index: value.h
===================================================================
RCS file: /cvs/src/src/gdb/value.h,v
retrieving revision 1.176
diff -u -p -u -p -r1.176 value.h
--- value.h 16 Feb 2011 10:13:53 -0000 1.176
+++ value.h 25 Feb 2011 21:43:23 -0000
@@ -471,6 +471,7 @@ extern struct value *value_from_pointer
extern struct value *value_from_double (struct type *type, DOUBLEST num);
extern struct value *value_from_decfloat (struct type *type,
const gdb_byte *decbytes);
+extern struct value *value_from_history_ref (char *, char **);
extern struct value *value_at (struct type *type, CORE_ADDR addr);
extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
Index: cli/cli-utils.c
===================================================================
RCS file: /cvs/src/src/gdb/cli/cli-utils.c,v
retrieving revision 1.10
diff -u -p -u -p -r1.10 cli-utils.c
--- cli/cli-utils.c 22 Feb 2011 18:45:05 -0000 1.10
+++ cli/cli-utils.c 25 Feb 2011 21:43:23 -0000
@@ -21,14 +21,15 @@
#include "cli/cli-utils.h"
#include "gdb_string.h"
#include "value.h"
+#include "gdb_assert.h"
#include <ctype.h>
/* *PP is a string denoting a number. Get the number of the. Advance
*PP after the string and any trailing whitespace.
- Currently the string can either be a number or "$" followed by the
- name of a convenience variable.
+ Currently the string can either be a number, or "$" followed by the
+ name of a convenience variable, or ("$" or "$$") followed by digits.
TRAILER is a character which can be found after the number; most
commonly this is `-'. If you don't want a trailer, use \0. */
@@ -41,24 +42,39 @@ get_number_trailer (char **pp, int trail
if (*p == '$')
{
- /* Make a copy of the name, so we can null-terminate it
- to pass to lookup_internalvar(). */
- char *varname;
- char *start = ++p;
- LONGEST val;
-
- while (isalnum (*p) || *p == '_')
- p++;
- varname = (char *) alloca (p - start + 1);
- strncpy (varname, start, p - start);
- varname[p - start] = '\0';
- if (get_internalvar_integer (lookup_internalvar (varname), &val))
- retval = (int) val;
- else
+ struct value *val = value_from_history_ref (p, &p);
+
+ if (val) /* Value history reference */
{
- printf_filtered (_("Convenience variable must "
- "have integer value.\n"));
- retval = 0;
+ if (TYPE_CODE (value_type (val)) == TYPE_CODE_INT)
+ retval = value_as_long (val);
+ else
+ {
+ printf_filtered (_("History value must have integer type."));
+ retval = 0;
+ }
+ }
+ else /* Convenience variable */
+ {
+ /* Internal variable. Make a copy of the name, so we can
+ null-terminate it to pass to lookup_internalvar(). */
+ char *varname;
+ char *start = ++p;
+ LONGEST val;
+
+ while (isalnum (*p) || *p == '_')
+ p++;
+ varname = (char *) alloca (p - start + 1);
+ strncpy (varname, start, p - start);
+ varname[p - start] = '\0';
+ if (get_internalvar_integer (lookup_internalvar (varname), &val))
+ retval = (int) val;
+ else
+ {
+ printf_filtered (_("Convenience variable must "
+ "have integer value.\n"));
+ retval = 0;
+ }
}
}
else
Index: cli/cli-utils.h
===================================================================
RCS file: /cvs/src/src/gdb/cli/cli-utils.h,v
retrieving revision 1.10
diff -u -p -u -p -r1.10 cli-utils.h
--- cli/cli-utils.h 21 Feb 2011 23:40:46 -0000 1.10
+++ cli/cli-utils.h 25 Feb 2011 21:43:23 -0000
@@ -23,8 +23,8 @@
/* *PP is a string denoting a number. Get the number of the. Advance
*PP after the string and any trailing whitespace.
- Currently the string can either be a number or "$" followed by the
- name of a convenience variable. */
+ Currently the string can either be a number, or "$" followed by the
+ name of a convenience variable, or ("$" or "$$") followed by digits. */
extern int get_number (char **);
Index: testsuite/gdb.base/break.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.base/break.exp,v
retrieving revision 1.46
diff -u -p -u -p -r1.46 break.exp
--- testsuite/gdb.base/break.exp 24 Feb 2011 18:37:14 -0000 1.46
+++ testsuite/gdb.base/break.exp 25 Feb 2011 21:43:23 -0000
@@ -236,6 +236,129 @@ gdb_test_multiple "info break 3-5" "info
}
}
+#
+# Test disable/enable with arguments
+#
+
+# Test with value history
+
+gdb_test "print 1" "" ""
+gdb_test "print 2" "" ""
+gdb_test "print 3" "" ""
+gdb_test "print 4" "" ""
+gdb_test "print 5" "" ""
+gdb_test "print 6" "" ""
+
+# $2 is 2 and $$ is 5
+gdb_test_no_output "disable \$2 \$\$" "disable using history values"
+
+set see1 0
+set see2 0
+set see3 0
+set see4 0
+set see5 0
+set see6 0
+
+gdb_test_multiple "info break" "check disable with history values" {
+ -re "1\[\t \]+breakpoint *keep y.* in main at .*:$main_line\[^\r\n\]*" {
+ set see1 1
+ exp_continue
+ }
+ -re "2\[\t \]+breakpoint *keep n\[^\r\n\]* in marker2 at \[^\r\n\]*" {
+ set see2 1
+ exp_continue
+ }
+ -re "3\[\t \]+breakpoint *keep y\[^\r\n\]*$bp_location7\[^\r\n\]*" {
+ set see3 1
+ exp_continue
+ }
+ -re "4\[\t \]+breakpoint *keep y\[^\r\n\]*$bp_location1\[^\r\n\]*" {
+ set see4 1
+ exp_continue
+ }
+ -re "5\[\t \]+breakpoint *keep n\[^\r\n\]*$bp_location1\[^\r\n\]*" {
+ set see5 1
+ exp_continue
+ }
+ -re "6\[\t \]+breakpoint *keep y\[^\r\n\]*$bp_location2\[^\r\n\]*" {
+ set see6 1
+ exp_continue
+ }
+ -re ".*$gdb_prompt $" {
+ if { $see1 && $see2 && $see3 && $see4 && $see5 && $see6 } then {
+ pass "check disable with history values"
+ } else {
+ fail "check disable with history values"
+ }
+ }
+}
+
+gdb_test "enable" "" ""
+gdb_test "set \$foo = 3" "" ""
+gdb_test "set \$bar = 6" "" ""
+gdb_test_no_output "disable \$foo \$bar" "disable with convenience values"
+
+set see1 0
+set see2 0
+set see3 0
+set see4 0
+set see5 0
+set see6 0
+
+gdb_test_multiple "info break" "check disable with convenience values" {
+ -re "1\[\t \]+breakpoint *keep y.* in main at .*:$main_line\[^\r\n\]*" {
+ set see1 1
+ exp_continue
+ }
+ -re "2\[\t \]+breakpoint *keep y\[^\r\n\]* in marker2 at \[^\r\n\]*" {
+ set see2 1
+ exp_continue
+ }
+ -re "3\[\t \]+breakpoint *keep n\[^\r\n\]*$bp_location7\[^\r\n\]*" {
+ set see3 1
+ exp_continue
+ }
+ -re "4\[\t \]+breakpoint *keep y\[^\r\n\]*$bp_location1\[^\r\n\]*" {
+ set see4 1
+ exp_continue
+ }
+ -re "5\[\t \]+breakpoint *keep y\[^\r\n\]*$bp_location1\[^\r\n\]*" {
+ set see5 1
+ exp_continue
+ }
+ -re "6\[\t \]+breakpoint *keep n\[^\r\n\]*$bp_location2\[^\r\n\]*" {
+ set see6 1
+ exp_continue
+ }
+ -re ".*$gdb_prompt $" {
+ if { $see1 && $see2 && $see3 && $see4 && $see5 && $see6 } then {
+ pass "check disable with convenience values"
+ } else {
+ fail "check disable with convenience values"
+ }
+ }
+}
+
+# test with bad values
+
+gdb_test "enable" "" ""
+gdb_test "disable 10" "No breakpoint number 10." \
+ "disable non-existent breakpoint 10"
+
+gdb_test "set \$baz 1.234"
+gdb_test "disable \$baz" \
+ "Convenience variable must have integer value.*" \
+ "disable with non-integer convenience var"
+gdb_test "disable \$grbx" \
+ "Convenience variable must have integer value.*" \
+ "disable with non-existent convenience var"
+gdb_test "disable \$10" \
+ "History has not yet reached .10." \
+ "disable with non-existent history value"
+gdb_test "disable \$1foo" \
+ "Convenience variable must have integer value.*" \
+ "disable with badly formed history value"
+
# FIXME: The rest of this test doesn't work with anything that can't
# handle arguments.
# Huh? There doesn't *appear* to be anything that passes arguments