derek.holloway
7502bf64a4
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76 lines
2.7 KiB
Plaintext
76 lines
2.7 KiB
Plaintext
# Copyright 2024 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test some code which relies on GDB interpreting the DW_AT_entry_pc
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# correctly in order to place the breakpoints. This was tested with
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# versions of GCC between 8.4 and 14.2 and in all cases the entry_pc
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# was required.
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#
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# Testing with Clang 9.0.1 and 15.0.2 seemed to indicate that the
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# Clang generated code didn't depend on the entry_pc being parsed.
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# Older versions of GCC, those prior to the -gstatement-frontiers work
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# added in 8.x, would generate DW_AT_entry_pc values pointing to the
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# first instruction of an inlined function. This first instruction
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# could then be reordered such that the first instruction might be
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# executed even when the actual call to the inline function ended up
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# being skipped. GDB can then hit a breakpoint for a function that
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# ends up never being called.
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#
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# This test is specifically testing that GDB correctly handles the
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# case where DW_AT_entry_pc is not the first instruction of an inlined
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# function, as can be the case in gcc 8.x with the
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# -gstatement-frontiers work in place.
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require {expr ![is_c_compiler_gcc] || [supports_statement_frontiers]}
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standard_testfile
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set options {debug optimize=-O2}
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lappend_include_file options $srcdir/lib/attributes.h
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if { [supports_statement_frontiers] } {
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lappend options additional_flags=-gstatement-frontiers
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}
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if { [prepare_for_testing "failed to prepare" $binfile $srcfile $options] } {
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return
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}
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if ![runto_main] {
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return
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}
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# This test makes use of inline functions.
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get_debug_format
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if { [skip_inline_frame_tests] } {
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untested "skipping inline frame tests"
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return
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}
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gdb_breakpoint "bar"
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set bp_bar_num [get_integer_valueof "\$bpnum" "*UNKNOWN*" \
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"get number of bar breakpoint"]
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gdb_breakpoint "foo"
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set bp_foo_num [get_integer_valueof "\$bpnum" "*UNKNOWN*" \
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"get number of foo breakpoint"]
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gdb_test "continue" \
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"Breakpoint ${bp_bar_num}(?:\\.$decimal)?, bar .*" "continue to bar"
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gdb_test "continue" \
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"Breakpoint ${bp_foo_num}(?:\\.$decimal)?, foo .*" "continue to foo"
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gdb_continue_to_end
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