From: Simon Marchi <simon.marchi@efficios.com>
To: gdb-patches@sourceware.org
Cc: Simon Marchi <simon.marchi@efficios.com>
Subject: [PATCH 5/5] gdb: change print format of flag enums with value 0
Date: Thu, 13 Feb 2020 20:30:00 -0000 [thread overview]
Message-ID: <20200213203035.30157-5-simon.marchi@efficios.com> (raw)
In-Reply-To: <20200213203035.30157-1-simon.marchi@efficios.com>
If a flag enum has value 0 and the enumeration type does not have an
enumerator with value 0, we currently print:
$1 = (unknown: 0x0)
I don't like the display of "unknown" here, since for flags, 0 is a
an expected value. It just means that no flags are set. This patch
makes it so that we print it as a simple 0 in this situation:
$1 = 0
If there is an enumerator with value 0, it is still printed using that
enumerator, for example (from the test):
$1 = FE_NONE
gdb/ChangeLog:
* valprint.c (generic_val_print_enum_1): When printing a flag
enum with value 0 and there is no enumerator with value 0, print
just "0" instead of "(unknown: 0x0)".
gdb/testsuite/ChangeLog:
* gdb.base/printcmds.exp (test_print_enums): Update expected
output.
---
gdb/testsuite/gdb.base/printcmds.exp | 2 +-
gdb/valprint.c | 31 +++++++++++++++++++++-------
2 files changed, 25 insertions(+), 8 deletions(-)
diff --git a/gdb/testsuite/gdb.base/printcmds.exp b/gdb/testsuite/gdb.base/printcmds.exp
index d6f5c75650bf..bd2afc8696f0 100644
--- a/gdb/testsuite/gdb.base/printcmds.exp
+++ b/gdb/testsuite/gdb.base/printcmds.exp
@@ -743,7 +743,7 @@ proc test_print_enums {} {
gdb_test "print (enum flag_enum) 0x0" [string_to_regexp " = FE_NONE"]
# Print a flag enum with value 0, where no enumerator has value 0.
- gdb_test "print flag_enum_without_zero" [string_to_regexp " = (unknown: 0x0)"]
+ gdb_test "print flag_enum_without_zero" [string_to_regexp " = 0"]
# Print a flag enum with unknown bits set.
gdb_test "print (enum flag_enum) 0xf1" [string_to_regexp " = (FE_ONE | unknown: 0xf0)"]
diff --git a/gdb/valprint.c b/gdb/valprint.c
index bd21be69e1bf..6e62d420c0f4 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -634,7 +634,6 @@ generic_val_print_enum_1 (struct type *type, LONGEST val,
/* We have a "flag" enum, so we try to decompose it into
pieces as appropriate. A flag enum has disjoint
constants by definition. */
- fputs_filtered ("(", stream);
for (i = 0; i < len; ++i)
{
QUIT;
@@ -646,24 +645,42 @@ generic_val_print_enum_1 (struct type *type, LONGEST val,
if ((val & enumval) != 0)
{
- if (!first)
+ if (first)
+ {
+ fputs_filtered ("(", stream);
+ first = 0;
+ }
+ else
fputs_filtered (" | ", stream);
- first = 0;
val &= ~TYPE_FIELD_ENUMVAL (type, i);
fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
}
}
- if (first || val != 0)
+ if (val != 0)
{
- if (!first)
+ /* There are leftover bits, print them. */
+ if (first)
+ fputs_filtered ("(", stream);
+ else
fputs_filtered (" | ", stream);
+
fputs_filtered ("unknown: 0x", stream);
print_longest (stream, 'x', 0, val);
+ fputs_filtered (")", stream);
+ }
+ else if (first)
+ {
+ /* Nothing has been printed and the value is 0, the enum value must
+ have been 0. */
+ fputs_filtered ("0", stream);
+ }
+ else
+ {
+ /* Something has been printed, close the parenthesis. */
+ fputs_filtered (")", stream);
}
-
- fputs_filtered (")", stream);
}
else
print_longest (stream, 'd', 0, val);
--
2.25.0
next prev parent reply other threads:[~2020-02-13 20:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 20:30 [PATCH 1/5] gnulib: import count-one-bits module and use it Simon Marchi
2020-02-13 20:30 ` Simon Marchi [this message]
2020-02-17 12:08 ` [PATCH 5/5] gdb: change print format of flag enums with value 0 Luis Machado
2020-02-17 19:02 ` Simon Marchi
2020-02-18 20:45 ` Tom Tromey
2020-02-18 20:52 ` Simon Marchi
2020-02-13 20:30 ` [PATCH 2/5] gdb: fix printing of flag enums with multi-bit enumerators Simon Marchi
2020-02-17 10:56 ` Luis Machado
2020-02-17 17:27 ` Simon Marchi
2020-02-17 17:40 ` Luis Machado
2020-02-17 19:20 ` Simon Marchi
2020-02-18 20:42 ` Tom Tromey
2020-02-13 20:30 ` [PATCH 3/5] gdb: allow duplicate enumerators in flag enums Simon Marchi
2020-02-17 11:01 ` Luis Machado
2020-02-18 20:38 ` Tom Tromey
2020-02-18 20:42 ` Tom Tromey
2020-02-18 20:48 ` Simon Marchi
2020-02-18 21:57 ` Tom Tromey
2020-02-18 22:25 ` Simon Marchi
2020-02-13 20:38 ` [PATCH 4/5] gdb: print unknown part of flag enum in hex Simon Marchi
2020-02-17 11:04 ` Luis Machado
2020-02-17 18:59 ` Simon Marchi
2020-02-18 20:43 ` Tom Tromey
2020-02-14 19:53 ` [PATCH 1/5] gnulib: import count-one-bits module and use it Simon Marchi
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