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Date: Mon, 3 Aug 2026 21:34:48 +0200 Message-Id: <20260803193449.33375-10-abdul.b.ijaz@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260803193449.33375-1-abdul.b.ijaz@intel.com> References: <20260803193449.33375-1-abdul.b.ijaz@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This change skips trampoline functions for the '-stack-list-arguments' command when the option 'skip-trampoline-functions' is set to 'on'. Before this change, GDB prints the arguments of frames indicated by the compiler with DIE "DW_AT_trampoline" in the backtrace for the mi command stack-list-arguments, but for better user experience, all such frames can be hidden from the user. In this example the IFX compiler emits "DW_AT_trampoline" tag for the 'first' and 'second' trampoline functions like following: function second (x, y) result(z) integer, intent(in) :: x, y integer :: z z = x * y ! breakpt-args end function second function first (num1, num2) result(total) integer, intent(in) :: num1, num2 integer :: total total = second (num1 + 4, num2 * 3) ! first-breakpt total = total + 30 end function first Related Dwarf: 0x0000013f: DW_TAG_subprogram DW_AT_low_pc (0x0000000000404350) DW_AT_high_pc (0x000000000040435f) DW_AT_frame_base (DW_OP_reg6 RBP) DW_AT_linkage_name ("second_.t74p.t75p") DW_AT_name ("second_.t74p.t75p") DW_AT_trampoline ("second_") 0x0000015a: DW_TAG_subprogram DW_AT_low_pc (0x00000000004044a0) DW_AT_high_pc (0x00000000004044af) DW_AT_frame_base (DW_OP_reg6 RBP) DW_AT_linkage_name ("first_.t104p.t105p") DW_AT_name ("first_.t104p.t105p") DW_AT_trampoline ("first_") Before this change, the -stack-list-arguments' command output looks like: ''' (gdb) -stack-list-arguments 0 ^done, stack-args=[ frame={level="0",args=[name="x",name="y"]}, frame={level="1",args=[]}, frame={level="2",args=[name="num1",name="num2"]}, frame={level="3",args=[]}, frame={level="4",args=[]}] ''' After change: ''' (gdb) -stack-list-arguments 0 ^done, stack-args=[ frame={level="0",args=[name="x",name="y"]}, frame={level="1",args=[name="num1",name="num2"]}, frame={level="2",args=[]}] ''' The test gdb.mi/mi-func-treampoline is updated for testing the change. --- gdb/doc/gdb.texinfo | 3 +++ gdb/mi/mi-cmd-stack.c | 7 +++++++ gdb/testsuite/gdb.mi/mi-func-trampoline.exp | 13 ++++++++++--- 3 files changed, 20 insertions(+), 3 deletions(-) diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 684716a869e..99909984241 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -35815,6 +35815,9 @@ variable object is updated, @value{GDBN} makes sure that the thread/frame combination the variable object is bound to still exists, and re-evaluates the variable object in context of that thread/frame. +If the option @code{skip-trampoline-functions} is set, @value{GDBN} will +not show trampoline functions in the stack. + The following is the complete set of @sc{gdb/mi} operations defined to access this functionality: diff --git a/gdb/mi/mi-cmd-stack.c b/gdb/mi/mi-cmd-stack.c index 1f66c02f8b4..66c758bd44e 100644 --- a/gdb/mi/mi-cmd-stack.c +++ b/gdb/mi/mi-cmd-stack.c @@ -401,6 +401,13 @@ mi_cmd_stack_list_args (const char *command, const char *const *argv, int argc) i++, fi = get_prev_frame (fi)) { QUIT; + if (skip_trampoline_functions) + { + for (int j = 0; (SAFE_TRAMPOLINE_CHAIN (j, fi) + && in_trampoline_frame (fi)); ++j) + fi = get_prev_frame (fi); + } + ui_out_emit_tuple tuple_emitter (uiout, "frame"); uiout->field_signed ("level", i); list_args_or_locals (user_frame_print_options, diff --git a/gdb/testsuite/gdb.mi/mi-func-trampoline.exp b/gdb/testsuite/gdb.mi/mi-func-trampoline.exp index f40a9722f91..4e0c3922eb6 100644 --- a/gdb/testsuite/gdb.mi/mi-func-trampoline.exp +++ b/gdb/testsuite/gdb.mi/mi-func-trampoline.exp @@ -13,9 +13,9 @@ # You should have received a copy of the GNU General Public License # along with this program. If not, see . -# Test -stack-list-frames command for functions with trampoline -# calls. Also checks if trampoline frames are filtered while printing -# stack. +# Test -stack-list-frames and -stack-list-arguments command for functions +# with trampoline calls. Also checks if trampoline frames are filtered +# while printing stack. require allow_fortran_tests @@ -55,6 +55,10 @@ set frame1_regx "\{level=\"0\",addr=\"$hex\",func=\"second\",file=\".*func-tramp set frame2_regx "\{level=\"2\",addr=\"$hex\",func=\"first\",.*\}" set frame3_regx "\{level=\"4\",addr=\"$hex\",func=\"func_trampoline\",.*\}" +set arg1_regx "\{level=\"0\",args=\\\[name=\"x\",name=\"y\"\\\]\}" +set arg2_regx "\{level=\"1\",args=\\\[name=\"num1\",name=\"num2\"\\\]\}" +set arg3_regx "\{level=\"2\",args=\\\[\\\]\}" + # Set breakpoint inside the innermost function 'second'. mi_create_breakpoint "-t $srcfile:$inner_loc" \ "insert breakpoint at line $inner_loc " \ @@ -67,3 +71,6 @@ mi_expect_stop \ mi_gdb_test "100-stack-list-frames" \ "100\\^done,stack=\\\[frame=${frame1_regx},frame=${frame2_regx},frame=${frame3_regx}\\\]" + +mi_gdb_test "200-stack-list-arguments 0" \ + "200\\^done,stack-args=\\\[frame=${arg1_regx},frame=${arg2_regx},frame=${arg3_regx}\\\]" -- 2.34.1 ________________________________________ Intel Deutschland GmbH Registered Address: Dornacher Strasse 1, 85622 Feldkirchen, Germany Tel: +49 (89) 99143-0 www.intel.de Managing Directors: Candice Moore, Jeffrey Schneiderman, Ramachandran Sitaraman Chairperson of the Supervisory Board: Sonja Pierer Registered Seat: Munich Commercial Register B: Amtsgericht Munich HRB 186928 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). 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