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Diffstat (limited to 'gdb/testsuite/gdb.dwarf2/dw2-epilogue-begin.exp.tcl')
| -rw-r--r-- | gdb/testsuite/gdb.dwarf2/dw2-epilogue-begin.exp.tcl | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-epilogue-begin.exp.tcl b/gdb/testsuite/gdb.dwarf2/dw2-epilogue-begin.exp.tcl new file mode 100644 index 0000000..155916b --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/dw2-epilogue-begin.exp.tcl @@ -0,0 +1,199 @@ +# Copyright 2022-2024 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +# Check that GDB can honor the epilogue_begin flag the compiler can place +# in the line-table data. +# We test 2 things: 1. that a software watchpoint triggered in an epilogue +# is correctly ignored +# 2. that GDB can mark the same line as both prologue and epilogue + +load_lib dwarf.exp + +# This test can only be run on targets which support DWARF-2 and use gas. +require dwarf2_support +# restricted to x86 to make it simpler to follow a variable +require is_x86_64_m64_target + +set trivial_line [gdb_get_line_number "trivial function"] +set main_prologue [gdb_get_line_number "main prologue"] +set main_epilogue [gdb_get_line_number "main end"] +set watch_start_line [gdb_get_line_number "watch start"] + +set asm_file [standard_output_file $srcfile2] + +# The producer will be set to clang because at the time of writing +# we only care about epilogues if the producer is clang. When the +# producer is GCC, variables use CFA locations, so watchpoints can +# continue working even on epilogues. +Dwarf::assemble $asm_file { + global srcdir subdir srcfile srcfile2 + global trivial_line main_prologue main_epilogue watch_start_line + declare_labels lines_label + + get_func_info main + get_func_info trivial + get_func_info watch + + if { $::version == 1 } { + set switch_file {} + } elseif { $::version == 2 } { + set switch_file { set f $f2 } + } else { + error "Unhandled version: $::version" + } + + cu {} { + compile_unit { + {language @DW_LANG_C} + {name dw2-prologue-end.c} + {stmt_list ${lines_label} DW_FORM_sec_offset} + {producer "clang version 17.0.1"} + } { + declare_labels char_label + + char_label: base_type { + {name char} + {encoding @DW_ATE_signed} + {byte_size 1 DW_FORM_sdata} + } + + subprogram { + {external 1 flag} + {name trivial} + {low_pc $trivial_start addr} + {high_pc "$trivial_start + $trivial_len" addr} + } + subprogram { + {external 1 flag} + {name watch} + {low_pc $watch_start addr} + {high_pc "$watch_start + $watch_len" addr} + } { + DW_TAG_variable { + {name local} + {type :$char_label} + {DW_AT_location {DW_OP_reg0} SPECIAL_expr} + } + } + subprogram { + {external 1 flag} + {name main} + {low_pc $main_start addr} + {high_pc "$main_start + $main_len" addr} + } + } + } + + lines {version 5} lines_label { + set diridx [include_dir "${srcdir}/${subdir}"] + set f1 [file_name "$srcfile" $diridx] + set f2 [file_name "$srcfile.inc" $diridx] + + set f $f1 + program { + DW_LNS_set_file $f + + DW_LNE_set_address $trivial_start + line $trivial_line + DW_LNS_set_prologue_end + DW_LNS_set_epilogue_begin + DW_LNS_copy + + DW_LNE_set_address $trivial_end + DW_LNE_end_sequence + + + DW_LNS_set_file $f + + DW_LNE_set_address $watch_start + line $watch_start_line + DW_LNS_copy + + DW_LNE_set_address watch_start + line [gdb_get_line_number "watch assign"] + DW_LNS_set_prologue_end + DW_LNS_copy + + eval $switch_file + DW_LNS_set_file $f + + DW_LNE_set_address watch_reassign + line [gdb_get_line_number "watch reassign"] + DW_LNS_set_epilogue_begin + DW_LNS_copy + + DW_LNE_set_address watch_end + line [gdb_get_line_number "watch end"] + DW_LNS_copy + + DW_LNE_set_address $watch_end + DW_LNE_end_sequence + + + DW_LNS_set_file $f + + DW_LNE_set_address $main_start + line $main_prologue + DW_LNS_set_prologue_end + DW_LNS_copy + + DW_LNE_set_address main_fun_call + line [gdb_get_line_number "main function call"] + DW_LNS_copy + + DW_LNE_set_address main_epilogue + line $main_epilogue + DW_LNS_set_epilogue_begin + DW_LNS_copy + + DW_LNE_set_address $main_end + DW_LNE_end_sequence + } + } +} + +if { [prepare_for_testing "failed to prepare" ${testfile} \ + [list $srcfile $asm_file] {nodebug}] } { + return -1 +} + +if ![runto_main] { + return -1 +} + +# Moving to the scope with a local variable. + +gdb_breakpoint $srcfile:$watch_start_line +gdb_continue_to_breakpoint "continuing to function" ".*" +gdb_test "next" "local = 2.*" "stepping to epilogue" + +# Forcing software watchpoints because hardware ones don't care if we +# are in the epilogue or not. +gdb_test_no_output "set can-use-hw-watchpoints 0" + +# Test that the software watchpoint will not trigger in this case +gdb_test "watch local" "\[W|w\]atchpoint .: local" "set watchpoint" +gdb_test "continue" ".*\[W|w\]atchpoint . deleted.*" \ + "confirm watchpoint doesn't trigger" + +# First we test that the trivial function has a line with both a prologue +# and an epilogue. Do this by finding a line that has 3 Y columns +set sep "\[ \t\]" +set hex_number "0x\[0-9a-f\]+" +gdb_test_multiple "maint info line-table" "test epilogue in linetable" -lbl { + -re "\[0-9\]$sep+$trivial_line$sep+$hex_number$sep+$hex_number$sep+Y$sep+Y$sep+Y" { + pass $gdb_test_name + } +} |