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llvm-6502/test/DebugInfo/X86/debug-loc-offset.ll

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Reapply DW_AT_low/high_pc patch: Use the range machinery for DW_AT_ranges and DW_AT_high/lo_pc. This commit moves us from a single range per subprogram to extending ranges if we are: a) In the same section, and b) In the same enclosing CU. This means we have more fine grained ranges for compile units, and fewer ranges overall when we have multiple functions in the same CU adjacent to each other in the object file. Also remove all of the earlier hacks around this functionality for function sections etc. Also update all of the testcases to take into account the merging functionality. with a fix for location entries in the debug_loc section: Make sure that debug loc entries are relative to the low_pc of the compile unit. This means that when we only have a single range that the offset should be just relative to the low_pc of the unit, for multiple ranges for a CU this means that we'll be relative to 0 which we emit along with DW_AT_ranges. This mostly shows up with linked binaries, so add a testcase with multiple CUs so that our location is going to be offset of a CU with a non-zero low_pc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204377 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-20 19:16:16 +00:00
; RUN: llc %s -filetype=obj -O0 -mtriple=i386-unknown-linux-gnu -dwarf-version=4 -o %t
; RUN: llvm-dwarfdump %t | FileCheck %s
; From the code:
; bar.cpp
; int bar (int b) {
; return b+4;
; }
; foo.cpp
; struct A {
; int a;
; int b;
; int c;
; };
; int a (struct A var) {
; return var.a;
; }
; Compiled separately for i386-pc-linux-gnu and linked together.
; This ensures that we have multiple compile units so that we can verify that
; debug_loc entries are relative to the low_pc of the CU. The loc entry for
; the byval argument in foo.cpp is in the second CU and so should have
; an offset relative to that CU rather than from the beginning of the text
; section.
; Checking that we have two compile units with two sets of high/lo_pc.
; CHECK: .debug_info contents
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_low_pc
; CHECK: DW_AT_high_pc
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_low_pc
; CHECK: DW_AT_high_pc
; CHECK: DW_TAG_subprogram
; CHECK-NEXT: DW_AT_MIPS_linkage_name [DW_FORM_strp]{{.*}}"_Z1a1A"
; CHECK: DW_TAG_formal_parameter
; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}}"var"
; CHECK: DW_AT_location [DW_FORM_sec_offset] (0x00000000)
; CHECK-NOT: DW_AT_location
; CHECK: .debug_loc contents:
; CHECK: 0x00000000: Beginning address offset: 0x0000000000000000
; CHECK: Ending address offset: 0x0000000000000009
%struct.A = type { i32, i32, i32 }
; Function Attrs: nounwind
define i32 @_Z3bari(i32 %b) #0 {
entry:
%b.addr = alloca i32, align 4
store i32 %b, i32* %b.addr, align 4
call void @llvm.dbg.declare(metadata !{i32* %b.addr}, metadata !25), !dbg !26
%0 = load i32* %b.addr, align 4, !dbg !27
%add = add nsw i32 %0, 4, !dbg !27
ret i32 %add, !dbg !27
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata) #1
; Function Attrs: nounwind
define i32 @_Z1a1A(%struct.A* byval align 4 %var) #0 {
entry:
call void @llvm.dbg.declare(metadata !{%struct.A* %var}, metadata !28), !dbg !29
%a = getelementptr inbounds %struct.A* %var, i32 0, i32 0, !dbg !30
%0 = load i32* %a, align 4, !dbg !30
ret i32 %0, !dbg !30
}
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0, !9}
!llvm.module.flags = !{!22, !23}
!llvm.ident = !{!24, !24}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 (trunk 204264) (llvm/trunk 204286)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1}
!1 = metadata !{metadata !"bar.cpp", metadata !"/usr/local/google/home/echristo/tmp"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"bar", metadata !"bar", metadata !"_Z3bari", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z3bari, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [bar]
!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/usr/local/google/home/echristo/tmp/bar.cpp]
!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = metadata !{metadata !8, metadata !8}
!8 = metadata !{i32 786468, null, null, metadata !"int", 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]
!9 = metadata !{i32 786449, metadata !10, i32 4, metadata !"clang version 3.5.0 (trunk 204264) (llvm/trunk 204286)", i1 false, metadata !"", i32 0, metadata !2, metadata !11, metadata !17, metadata !2, metadata !2, metadata !"", i32 1}
!10 = metadata !{metadata !"foo.cpp", metadata !"/usr/local/google/home/echristo/tmp"}
!11 = metadata !{metadata !12}
!12 = metadata !{i32 786451, metadata !10, null, metadata !"A", i32 1, i64 96, i64 32, i32 0, i32 0, null, metadata !13, i32 0, null, null, metadata !"_ZTS1A"} ; [ DW_TAG_structure_type ] [A] [line 1, size 96, align 32, offset 0] [def] [from ]
!13 = metadata !{metadata !14, metadata !15, metadata !16}
!14 = metadata !{i32 786445, metadata !10, metadata !"_ZTS1A", metadata !"a", i32 2, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int]
!15 = metadata !{i32 786445, metadata !10, metadata !"_ZTS1A", metadata !"b", i32 3, i64 32, i64 32, i64 32, i32 0, metadata !8} ; [ DW_TAG_member ] [b] [line 3, size 32, align 32, offset 32] [from int]
!16 = metadata !{i32 786445, metadata !10, metadata !"_ZTS1A", metadata !"c", i32 4, i64 32, i64 32, i64 64, i32 0, metadata !8} ; [ DW_TAG_member ] [c] [line 4, size 32, align 32, offset 64] [from int]
!17 = metadata !{metadata !18}
!18 = metadata !{i32 786478, metadata !10, metadata !19, metadata !"a", metadata !"a", metadata !"_Z1a1A", i32 7, metadata !20, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (%struct.A*)* @_Z1a1A, null, null, metadata !2, i32 7} ; [ DW_TAG_subprogram ] [line 7] [def] [a]
!19 = metadata !{i32 786473, metadata !10} ; [ DW_TAG_file_type ] [/usr/local/google/home/echristo/tmp/foo.cpp]
!20 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !21, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!21 = metadata !{metadata !8, metadata !12}
!22 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!23 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!24 = metadata !{metadata !"clang version 3.5.0 (trunk 204264) (llvm/trunk 204286)"}
!25 = metadata !{i32 786689, metadata !4, metadata !"b", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [b] [line 1]
!26 = metadata !{i32 1, i32 0, metadata !4, null}
!27 = metadata !{i32 2, i32 0, metadata !4, null}
!28 = metadata !{i32 786689, metadata !18, metadata !"var", metadata !19, i32 16777223, metadata !"_ZTS1A", i32 0, i32 0}
!29 = metadata !{i32 7, i32 0, metadata !18, null}
!30 = metadata !{i32 8, i32 0, metadata !18, null} ; [ DW_TAG_imported_declaration ]
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