mirror of
https://github.com/c64scene-ar/llvm-6502.git
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2a39c993eb
variables (for example, by-value struct arguments passed in registers, or large integer values split across several smaller registers). On the IR level, this adds a new type of complex address operation OpPiece to DIVariable that describes size and offset of a variable fragment. On the DWARF emitter level, all pieces describing the same variable are collected, sorted and emitted as DWARF expressions using the DW_OP_piece and DW_OP_bit_piece operators. http://reviews.llvm.org/D3373 rdar://problem/15928306 What this patch doesn't do / Future work: - This patch only adds the backend machinery to make this work, patches that change SROA and SelectionDAG's type legalizer to actually create such debug info will follow. (http://reviews.llvm.org/D2680) - Making the DIVariable complex expressions into an argument of dbg.value will reduce the memory footprint of the debug metadata. - The sorting/uniquing of pieces should be moved into DebugLocEntry, to facilitate the merging of multi-piece entries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214576 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
4.7 KiB
LLVM
77 lines
4.7 KiB
LLVM
; RUN: llc -O0 %s -filetype=obj -o %t.o
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; RUN: llvm-dwarfdump -debug-dump=loc %t.o | FileCheck --check-prefix=CHECK-DWARF %s
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;
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; rdar://problem/15928306
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;
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; Test that we can emit debug info for aggregate values that are split
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; up across multiple registers by SROA.
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;
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; // Compile with -O1.
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; typedef struct { long int a; int b;} S;
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;
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; int foo(S s) {
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; return s.b;
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; }
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;
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;
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; CHECK-DWARF: .debug_loc contents:
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;
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; 0x0000000000000000 - 0x0000000000000006: rdi, piece 0x00000008, rsi, piece 0x00000004
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; CHECK-DWARF: Beginning address offset: 0x0000000000000000
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; CHECK-DWARF: Ending address offset: [[LTMP3:.*]]
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; CHECK-DWARF: Location description: 55 93 08 54 93 04
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; 0x0000000000000006 - 0x0000000000000008: rbp-8, piece 0x00000008, rax, piece 0x00000004 )
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; CHECK-DWARF: Beginning address offset: [[LTMP3]]
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; CHECK-DWARF: Ending address offset: [[END:.*]]
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; CHECK-DWARF: Location description: 76 78 93 08 54 93 04
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; Function Attrs: nounwind ssp uwtable
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define i32 @foo(i64 %s.coerce0, i32 %s.coerce1) #0 {
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entry:
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call void @llvm.dbg.value(metadata !{i64 %s.coerce0}, i64 0, metadata !20), !dbg !21
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call void @llvm.dbg.value(metadata !{i32 %s.coerce1}, i64 0, metadata !22), !dbg !21
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ret i32 %s.coerce1, !dbg !23
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata) #1
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attributes #0 = { nounwind ssp uwtable "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!17, !18}
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!llvm.ident = !{!19}
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!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5 ", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !""}
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!1 = metadata !{metadata !"pieces.c", metadata !""}
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!2 = metadata !{}
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!3 = metadata !{metadata !4}
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!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"", i32 3, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 (i64, i32)* @foo, null, null, metadata !15, i32 3} ; [ DW_TAG_subprogram ] [line 3] [def] [foo]
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!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/pieces.c]
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!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 ]
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!7 = metadata !{metadata !8, metadata !9}
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!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]
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!9 = metadata !{i32 786454, metadata !1, null, metadata !"S", i32 1, i64 0, i64 0, i64 0, i32 0, metadata !10} ; [ DW_TAG_typedef ] [S] [line 1, size 0, align 0, offset 0] [from ]
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!10 = metadata !{i32 786451, metadata !1, null, metadata !"", i32 1, i64 128, i64 64, i32 0, i32 0, null, metadata !11, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [line 1, size 128, align 64, offset 0] [def] [from ]
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!11 = metadata !{metadata !12, metadata !14}
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!12 = metadata !{i32 786445, metadata !1, metadata !10, metadata !"a", i32 1, i64 64, i64 64, i64 0, i32 0, metadata !13} ; [ DW_TAG_member ] [a] [line 1, size 64, align 64, offset 0] [from long int]
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!13 = metadata !{i32 786468, null, null, metadata !"long int", i32 0, i64 64, i64 64, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [long int] [line 0, size 64, align 64, offset 0, enc DW_ATE_signed]
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!14 = metadata !{i32 786445, metadata !1, metadata !10, metadata !"b", i32 1, i64 32, i64 32, i64 64, i32 0, metadata !8} ; [ DW_TAG_member ] [b] [line 1, size 32, align 32, offset 64] [from int]
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!15 = metadata !{metadata !16}
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!16 = metadata !{i32 786689, metadata !4, metadata !"s", metadata !5, i32 16777219, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [s] [line 3]
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!17 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
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!18 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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!19 = metadata !{metadata !"clang version 3.5 "}
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!20 = metadata !{i32 786689, metadata !4, metadata !"s", metadata !5, i32 16777219, metadata !9, i32 0, i32 0, metadata !24} ; [ DW_TAG_arg_variable ] [s] [line 3] [piece, size 8, offset 0]
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!21 = metadata !{i32 3, i32 0, metadata !4, null}
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!22 = metadata !{i32 786689, metadata !4, metadata !"s", metadata !5, i32 16777219, metadata !9, i32 0, i32 0, metadata !27} ; [ DW_TAG_arg_variable ] [s] [line 3] [piece, size 4, offset 8]
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!23 = metadata !{i32 4, i32 0, metadata !4, null}
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!24 = metadata !{i64 3, i64 0, i64 8}
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!25 = metadata !{}
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!27 = metadata !{i64 3, i64 8, i64 4}
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