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Reapply r160148 (reverted in r163570) fixing spurious breakpoints in modern GDB

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This reapplies the fix for PR13303 now with more justification. Based on my
execution of the GDB 7.5 test suite this results in:

expected passes: 16101 -> 20890 (+30%)
unexpected failures: 4826 -> 637 (-77%)

There are 23 checks that used to pass and now fail. They are all in
gdb.reverse. Investigating a few looks like they were accidentally passing
due to extra breakpoints being set by this bug. They're generally due to the
difference in end location between gcc and clang, the test suite is trying to
set breakpoints on the closing '}' that clang doesn't associate with any
instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169304 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2012-12-04 21:05:36 +00:00
parent 8181827d1b
commit b36c531653
2 changed files with 29 additions and 1 deletions
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2
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -1511,7 +1511,7 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
MF->getFunction()->getContext());
recordSourceLine(FnStartDL.getLine(), FnStartDL.getCol(),
FnStartDL.getScope(MF->getFunction()->getContext()),
0);
DWARF2_FLAG_IS_STMT);
}
}

28
test/DebugInfo/X86/pr13303.ll Normal file
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@ -0,0 +1,28 @@
; RUN: llc %s -o %t -filetype=obj -mtriple=x86_64-unknown-linux-gnu
; RUN: llvm-dwarfdump %t | FileCheck %s
; PR13303
; Check that the prologue ends with is_stmt here.
; CHECK: 0x0000000000000000 {{.*}} is_stmt
define i32 @main() nounwind uwtable {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval
ret i32 0, !dbg !10
}
!llvm.dbg.cu = !{!0}
!0 = metadata !{i32 786449, i32 0, i32 12, metadata !"PR13303.c", metadata !"/home/probinson", metadata !"clang version 3.2 (trunk 160143)", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !1} ; [ DW_TAG_compile_unit ] [/home/probinson/PR13303.c] [DW_LANG_C99]
!1 = metadata !{metadata !2}
!2 = metadata !{i32 0}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !5}
!5 = metadata !{i32 786478, i32 0, metadata !6, metadata !"main", metadata !"main", metadata !"", metadata !6, i32 1, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, i32 ()* @main, null, null, metadata !1, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [main]
!6 = metadata !{i32 786473, metadata !"PR13303.c", metadata !"/home/probinson", null} ; [ DW_TAG_file_type ]
!7 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!8 = metadata !{metadata !9}
!9 = metadata !{i32 786468, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!10 = metadata !{i32 1, i32 14, metadata !11, null}
!11 = metadata !{i32 786443, metadata !5, i32 1, i32 12, metadata !6, i32 0} ; [ DW_TAG_lexical_block ] [/home/probinson/PR13303.c]