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* [binutils-gdb] [gdb] Add debug_{exp,val}
@ 2022-08-05 6:10 Tom de Vries
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From: Tom de Vries @ 2022-08-05 6:10 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=731d2cc1d5106c077584bd83e96dbba4f7e11118
commit 731d2cc1d5106c077584bd83e96dbba4f7e11118
Author: Tom de Vries <tdevries@suse.de>
Date: Fri Aug 5 08:09:57 2022 +0200
[gdb] Add debug_{exp,val}
When debugging cc1 I heavily rely on simple one-parameter debug functions
that allow me to inspect a variable of a common type, like:
- debug_generic_expr
- debug_gimple_stmt
- debug_rtx
and I miss similar functions in gdb.
Add functions to dump variables of types 'value' and 'expression':
- debug_exp, and
- debug_val.
Tested on x86_64-linux, by breaking on varobj_create, and doing:
...
(gdb) call debug_exp (var->root->exp.get ())
&"Operation: OP_VAR_VALUE\n"
&" Block symbol:\n"
&" Symbol: aaa\n"
&" Block: 0x2d064f0\n"
(gdb)
...
and:
...
(gdb) call debug_val (value)
&"5"
(gdb)
...
Diff:
---
gdb/expprint.c | 13 +++++++++++++
gdb/valprint.c | 12 ++++++++++++
gdbsupport/common-defs.h | 6 ++++++
3 files changed, 31 insertions(+)
diff --git a/gdb/expprint.c b/gdb/expprint.c
index cef6ffb3566..8534d2ac443 100644
--- a/gdb/expprint.c
+++ b/gdb/expprint.c
@@ -65,6 +65,19 @@ dump_prefix_expression (struct expression *exp, struct ui_file *stream)
exp->op->dump (stream, 0);
}
+/* Meant to be used in debug sessions, so don't export it in a header file. */
+extern void ATTRIBUTE_USED debug_exp (struct expression *exp);
+
+/* Print EXP. */
+
+void
+ATTRIBUTE_USED
+debug_exp (struct expression *exp)
+{
+ exp->op->dump (gdb_stdlog, 0);
+ gdb_flush (gdb_stdlog);
+}
+
namespace expr
{
diff --git a/gdb/valprint.c b/gdb/valprint.c
index f873e12d0ca..3ad4c0cd357 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -1190,6 +1190,18 @@ value_print (struct value *val, struct ui_file *stream,
current_language->value_print (val, stream, options);
}
+/* Meant to be used in debug sessions, so don't export it in a header file. */
+extern void ATTRIBUTE_UNUSED debug_val (struct value *val);
+
+/* Print VAL. */
+
+void ATTRIBUTE_UNUSED
+debug_val (struct value *val)
+{
+ value_print (val, gdb_stdlog, &user_print_options);
+ gdb_flush (gdb_stdlog);
+}
+
static void
val_print_type_code_flags (struct type *type, struct value *original_value,
int embedded_offset, struct ui_file *stream)
diff --git a/gdbsupport/common-defs.h b/gdbsupport/common-defs.h
index eed364a48ce..e4985332e3f 100644
--- a/gdbsupport/common-defs.h
+++ b/gdbsupport/common-defs.h
@@ -191,6 +191,12 @@
#define ATTRIBUTE_UNUSED_RESULT
#endif
+#if (GCC_VERSION > 4000)
+#define ATTRIBUTE_USED __attribute__ ((__used__))
+#else
+#define ATTRIBUTE_USED
+#endif
+
#include "libiberty.h"
#include "pathmax.h"
#include "gdb/signals.h"
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