[PATCH] Fix raw-frame-arguments in combination with frame-filters

[Hannes Domani <ssbssa@yahoo.de>]

Currently, if frame-filters are active, raw-values is used instead of
raw-frame-arguments to decide if a pretty-printer should be invoked for
frame arguments in a backtrace.

In this example, "super struct" is the output of the pretty-printer:

    (gdb) disable frame-filter global BasicFrameFilter
    (gdb) bt
    #0  foo (x=42, ss=super struct = {...}) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57

If no frame-filter is active, then the raw-values print option does not
affect the backtrace output:

    (gdb) set print raw-values on
    (gdb) bt
    #0  foo (x=42, ss=super struct = {...}) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57
    (gdb) set print raw-values off

Instead, the raw-frame-arguments option disables the pretty-printer in the
backtrace:

    (gdb) bt -raw-frame-arguments on
    #0  foo (x=42, ss=...) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57

But if a frame-filter is active, the same rules don't apply.
The option raw-frame-arguments is ignored, but raw-values decides if the
pretty-printer is used:

    (gdb) enable frame-filter global BasicFrameFilter
    (gdb) bt
    #0  foo (x=42, ss=super struct = {...}) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57
    (gdb) set print raw-values on
    (gdb) bt
    #0  foo (x=42, ss=...) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57
    (gdb) set print raw-values off
    (gdb) bt -raw-frame-arguments on
    #0  foo (x=42, ss=super struct = {...}) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57

So this adds the PRINT_RAW_FRAME_ARGUMENTS flag to frame_filter_flag, which
is then used in the frame-filter to override the raw flag in enumerate_args.

Then the output is the same if a frame-filter is active, the pretty-printer
for backtraces is only disabled with the raw-frame-arguments option:

    (gdb) enable frame-filter global BasicFrameFilter
    (gdb) bt
    #0  foo (x=42, ss=super struct = {...}) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57
    (gdb) set print raw-values on
    (gdb) bt
    #0  foo (x=42, ss=super struct = {...}) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57
    (gdb) set print raw-values off
    (gdb) bt -raw-frame-arguments on
    #0  foo (x=42, ss=...) at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:47
    #1  0x004016aa in main () at C:/src/repos/gdb-testsuite/gdb/testsuite/gdb.python/py-frame-args.c:57

Co-Authored-By: Andrew Burgess <aburgess@redhat.com>
---
v3:
- Incorporated Andrews changes related to MI.
- Made raw-frame-arguments also work with disabled frame-filter for MI.
- Added some tests for MI as well.

v2:
- More detailed commit message describing the problem.
---
 gdb/extension.h                            |  4 +++
 gdb/mi/mi-cmd-stack.c                      | 15 +++++++--
 gdb/python/py-framefilter.c                | 22 ++++++++-----
 gdb/stack.c                                |  2 ++
 gdb/testsuite/gdb.python/py-frame-args.exp | 36 ++++++++++++++++++++++
 gdb/testsuite/gdb.python/py-frame-args.py  | 14 +++++++++
 6 files changed, 83 insertions(+), 10 deletions(-)

diff --git a/gdb/extension.h b/gdb/extension.h
index 530f6ce72ac..1e3df081afb 100644
--- a/gdb/extension.h
+++ b/gdb/extension.h
@@ -103,6 +103,10 @@ enum frame_filter_flag
 
     /* Set this flag if elided frames should not be printed.  */
     PRINT_HIDE = 1 << 5,
+
+    /* Set this flag if pretty printers for frame arguments should not
+       be invoked.  */
+    PRINT_RAW_FRAME_ARGUMENTS = 1 << 6,
   };
 
 DEF_ENUM_FLAGS_TYPE (enum frame_filter_flag, frame_filter_flags);
diff --git a/gdb/mi/mi-cmd-stack.c b/gdb/mi/mi-cmd-stack.c
index 401e7c40726..a7c8f80464c 100644
--- a/gdb/mi/mi-cmd-stack.c
+++ b/gdb/mi/mi-cmd-stack.c
@@ -372,6 +372,8 @@ mi_cmd_stack_list_args (const char *command, const char *const *argv, int argc)
   if (! raw_arg && frame_filters)
     {
       frame_filter_flags flags = PRINT_LEVEL | PRINT_ARGS;
+      if (user_frame_print_options.print_raw_frame_arguments)
+	flags |= PRINT_RAW_FRAME_ARGUMENTS;
       int py_frame_low = frame_low;
 
       /* We cannot pass -1 to frame_low, as that would signify a
@@ -466,6 +468,8 @@ mi_cmd_stack_list_variables (const char *command, const char *const *argv,
    if (! raw_arg && frame_filters)
      {
        frame_filter_flags flags = PRINT_LEVEL | PRINT_ARGS | PRINT_LOCALS;
+       if (user_frame_print_options.print_raw_frame_arguments)
+	 flags |= PRINT_RAW_FRAME_ARGUMENTS;
 
        result = mi_apply_ext_lang_frame_filter (frame, flags,
 						print_value,
@@ -491,7 +495,8 @@ mi_cmd_stack_list_variables (const char *command, const char *const *argv,
 
 static void
 list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
-		   enum print_values values, int skip_unavailable)
+		   enum print_values values, int skip_unavailable,
+		   const frame_print_options &fp_opts)
 {
   struct ui_out *uiout = current_uiout;
 
@@ -548,6 +553,8 @@ list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
 
 	      get_no_prettyformat_print_options (&opts);
 	      opts.deref_ref = true;
+	      if (arg->sym->is_argument ())
+		opts.raw = fp_opts.print_raw_frame_arguments;
 	      common_val_print (arg->val, &stb, 0, &opts,
 				language_def (arg->sym->language ()));
 	    }
@@ -663,9 +670,11 @@ list_args_or_locals (const frame_print_options &fp_opts,
 		}
 
 	      if (arg.entry_kind != print_entry_values_only)
-		list_arg_or_local (&arg, what, values, skip_unavailable);
+		list_arg_or_local (&arg, what, values, skip_unavailable,
+				   fp_opts);
 	      if (entryarg.entry_kind != print_entry_values_no)
-		list_arg_or_local (&entryarg, what, values, skip_unavailable);
+		list_arg_or_local (&entryarg, what, values, skip_unavailable,
+				   fp_opts);
 	    }
 	}
 
diff --git a/gdb/python/py-framefilter.c b/gdb/python/py-framefilter.c
index dc7e47d70f0..ba4f3298d32 100644
--- a/gdb/python/py-framefilter.c
+++ b/gdb/python/py-framefilter.c
@@ -414,12 +414,14 @@ static enum ext_lang_bt_status
 enumerate_args (PyObject *iter,
 		struct ui_out *out,
 		enum ext_lang_frame_args args_type,
+		bool raw_frame_args,
 		int print_args_field,
 		frame_info_ptr frame)
 {
   struct value_print_options opts;
 
   get_user_print_options (&opts);
+  opts.raw = raw_frame_args;
 
   if (args_type == CLI_SCALAR_VALUES)
     {
@@ -634,7 +636,8 @@ static enum ext_lang_bt_status
 py_mi_print_variables (PyObject *filter, struct ui_out *out,
 		       struct value_print_options *opts,
 		       enum ext_lang_frame_args args_type,
-		       frame_info_ptr frame)
+		       frame_info_ptr frame,
+		       bool raw_frame_args_p)
 {
   gdbpy_ref<> args_iter (get_py_iter_from_func (filter, "frame_args"));
   if (args_iter == NULL)
@@ -647,8 +650,8 @@ py_mi_print_variables (PyObject *filter, struct ui_out *out,
   ui_out_emit_list list_emitter (out, "variables");
 
   if (args_iter != Py_None
-      && (enumerate_args (args_iter.get (), out, args_type, 1, frame)
-	  == EXT_LANG_BT_ERROR))
+      && (enumerate_args (args_iter.get (), out, args_type, raw_frame_args_p,
+			  1, frame) == EXT_LANG_BT_ERROR))
     return EXT_LANG_BT_ERROR;
 
   if (locals_iter != Py_None
@@ -693,6 +696,7 @@ static enum ext_lang_bt_status
 py_print_args (PyObject *filter,
 	       struct ui_out *out,
 	       enum ext_lang_frame_args args_type,
+	       bool raw_frame_args,
 	       frame_info_ptr frame)
 {
   gdbpy_ref<> args_iter (get_py_iter_from_func (filter, "frame_args"));
@@ -718,7 +722,8 @@ py_print_args (PyObject *filter,
 	}
     }
   else if (args_iter != Py_None
-	   && (enumerate_args (args_iter.get (), out, args_type, 0, frame)
+	   && (enumerate_args (args_iter.get (), out, args_type,
+			       raw_frame_args, 0, frame)
 	       == EXT_LANG_BT_ERROR))
     return EXT_LANG_BT_ERROR;
 
@@ -802,8 +807,9 @@ py_print_frame (PyObject *filter, frame_filter_flags flags,
   /* stack-list-variables.  */
   if (print_locals && print_args && ! print_frame_info)
     {
-      if (py_mi_print_variables (filter, out, &opts,
-				 args_type, frame) == EXT_LANG_BT_ERROR)
+      bool raw_frame_args = (flags & PRINT_RAW_FRAME_ARGUMENTS) != 0;
+      if (py_mi_print_variables (filter, out, &opts, args_type, frame,
+				 raw_frame_args) == EXT_LANG_BT_ERROR)
 	return EXT_LANG_BT_ERROR;
       return EXT_LANG_BT_OK;
     }
@@ -949,7 +955,9 @@ py_print_frame (PyObject *filter, frame_filter_flags flags,
      wrong.  */
   if (print_args && (location_print || out->is_mi_like_p ()))
     {
-      if (py_print_args (filter, out, args_type, frame) == EXT_LANG_BT_ERROR)
+      bool raw_frame_args = (flags & PRINT_RAW_FRAME_ARGUMENTS) != 0;
+      if (py_print_args (filter, out, args_type, raw_frame_args, frame)
+	  == EXT_LANG_BT_ERROR)
 	return EXT_LANG_BT_ERROR;
     }
 
diff --git a/gdb/stack.c b/gdb/stack.c
index 20bb85efd19..e0c3bcddb2b 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -2006,6 +2006,8 @@ backtrace_command_1 (const frame_print_options &fp_opts,
     flags |= PRINT_LOCALS;
   if (bt_opts.hide)
     flags |= PRINT_HIDE;
+  if (fp_opts.print_raw_frame_arguments)
+    flags |= PRINT_RAW_FRAME_ARGUMENTS;
 
   if (!bt_opts.no_filters)
     {
diff --git a/gdb/testsuite/gdb.python/py-frame-args.exp b/gdb/testsuite/gdb.python/py-frame-args.exp
index 5c099e01264..1609989aa3b 100644
--- a/gdb/testsuite/gdb.python/py-frame-args.exp
+++ b/gdb/testsuite/gdb.python/py-frame-args.exp
@@ -33,6 +33,42 @@ gdb_test_no_output "source ${remote_python_file}" "load python file"
 gdb_breakpoint [gdb_get_line_number "break-here"]
 gdb_continue_to_breakpoint "break-here" ".* break-here .*"
 
+# Test raw-frame-arguments on backtrace with and without frame-filter
+gdb_test "interpreter-exec mi \"-enable-frame-filters\"" \
+    "done"
+foreach_with_prefix filtered {enable disable} {
+    gdb_test_no_output "$filtered frame-filter global BasicFrameFilter"
+
+    gdb_test "bt 1" \
+	".*foo \\(x=42, ss=super struct = {\[.\]{3}}\\).*" \
+	"bt pretty"
+
+    gdb_test "bt -raw-frame-arguments on 1" \
+	".*foo \\(x=42, ss=\[.\]{3}\\).*" \
+	"bt raw"
+
+    gdb_test "interpreter-exec mi \"-stack-list-arguments 1\"" \
+	".*name=\"ss\",value=\"super struct =.*" \
+	"mi bt pretty"
+
+    gdb_test_no_output "set print raw-frame-arguments on"
+    gdb_test "interpreter-exec mi \"-stack-list-arguments 1\"" \
+	".*name=\"ss\",value=\".a =.*" \
+	"mi bt raw"
+    gdb_test_no_output "set print raw-frame-arguments off"
+
+    # "set print raw-values" should not affect frame arguments
+    gdb_test_no_output "set print raw-values on"
+    gdb_test "bt 1" \
+	".*foo \\(x=42, ss=super struct = {\[.\]{3}}\\).*" \
+	"bt pretty,raw-values"
+
+    gdb_test "interpreter-exec mi \"-stack-list-arguments 1\"" \
+	".*name=\"ss\",value=\"super struct =.*" \
+	"mi bt pretty,raw-values"
+    gdb_test_no_output "set print raw-values off"
+}
+
 # Test all combinations with raw off.
 
 gdb_test_no_output "set print raw-frame-arguments off"
diff --git a/gdb/testsuite/gdb.python/py-frame-args.py b/gdb/testsuite/gdb.python/py-frame-args.py
index 8cb85e059e2..ca3b7c62fa5 100644
--- a/gdb/testsuite/gdb.python/py-frame-args.py
+++ b/gdb/testsuite/gdb.python/py-frame-args.py
@@ -76,3 +76,17 @@ pretty_printers_dict = {}
 
 register_pretty_printers()
 gdb.pretty_printers.append(lookup_function)
+
+
+class BasicFrameFilter(object):
+    def __init__(self):
+        self.name = "BasicFrameFilter"
+        self.priority = 100
+        self.enabled = True
+        gdb.frame_filters[self.name] = self
+
+    def filter(self, frame_iter):
+        return frame_iter
+
+
+BasicFrameFilter()
-- 
2.35.1