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c1be4794ba
This reverts commit r218918, effectively reapplying r218914 after fixing an Ocaml bindings test and an Asan crash. The root cause of the latter was a tightened-up check in `DILexicalBlock::Verify()`, so I'll file a PR to investigate who requires the loose check (and why). Original commit message follows. -- This patch addresses the first stage of PR17891 by folding constant arguments together into a single MDString. Integers are stringified and a `\0` character is used as a separator. Part of PR17891. Note: I've attached my testcases upgrade scripts to the PR. If I've just broken your out-of-tree testcases, they might help. llvm-svn: 219010
96 lines
5.2 KiB
LLVM
96 lines
5.2 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Testing that two distinct (distinct by writing them in separate files, while
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; still fulfilling C++'s ODR by having identical token sequences) functions,
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; linked under LTO, get plausible debug info (and don't crash).
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; Built from source:
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; $ clang++ a.cpp b.cpp -g -c -emit-llvm
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; $ llvm-link a.bc b.bc -o ab.bc
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; This change is intended to tickle a case where the subprogram MDNode
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; associated with the llvm::Function will differ from the subprogram
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; referenced by the DbgLocs in the function.
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; $ sed -ie "s/!12, !0/!0, !12/" ab.ll
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; $ cat a.cpp
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; inline int func(int i) {
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; return i * 2;
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; }
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; int (*x)(int) = &func;
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; $ cat b.cpp
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; inline int func(int i) {
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; return i * 2;
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; }
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; int (*y)(int) = &func;
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "func"
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; CHECK: DW_TAG_compile_unit
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; FIXME: Maybe we should drop the subprogram here - since the function was
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; emitted in one CU, due to linkonce_odr uniquing. We certainly don't emit the
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; subprogram here if the source location for this definition is the same (see
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; test/DebugInfo/cross-cu-linkonce.ll), though it's very easy to tickle that
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; into failing even without duplicating the source as has been done in this
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; case (two cpp files in different directories, including the same header that
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; contains an inline function - clang will produce distinct subprogram metadata
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; that won't deduplicate owing to the file location information containing the
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; directory of the source file even though the file name is absolute, not
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; relative)
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; CHECK: DW_TAG_subprogram
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@x = global i32 (i32)* @_Z4funci, align 8
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@y = global i32 (i32)* @_Z4funci, align 8
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; Function Attrs: inlinehint nounwind uwtable
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define linkonce_odr i32 @_Z4funci(i32 %i) #0 {
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%1 = alloca i32, align 4
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store i32 %i, i32* %1, align 4
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call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !22, metadata !{metadata !"0x102"}), !dbg !23
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%2 = load i32* %1, align 4, !dbg !24
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%3 = mul nsw i32 %2, 2, !dbg !24
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ret i32 %3, !dbg !24
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { inlinehint nounwind uwtable "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" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!12, !0}
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!llvm.module.flags = !{!19, !20}
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!llvm.ident = !{!21, !21}
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!0 = metadata !{metadata !"0x11\004\00clang version 3.5.0 \000\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !9, metadata !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/a.cpp] [DW_LANG_C_plus_plus]
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!1 = metadata !{metadata !"a.cpp", metadata !"/tmp/dbginfo"}
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!2 = metadata !{}
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!3 = metadata !{metadata !4}
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!4 = metadata !{metadata !"0x2e\00func\00func\00_Z4funci\001\000\001\000\006\00256\000\001", metadata !1, metadata !5, metadata !6, null, i32 (i32)* @_Z4funci, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 1] [def] [func]
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!5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/a.cpp]
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!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, 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 !8}
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!8 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
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!9 = metadata !{metadata !10}
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!10 = metadata !{metadata !"0x34\00x\00x\00\004\000\001", null, metadata !5, metadata !11, i32 (i32)** @x, null} ; [ DW_TAG_variable ] [x] [line 4] [def]
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!11 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !6} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
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!12 = metadata !{metadata !"0x11\004\00clang version 3.5.0 \000\00\000\00\001", metadata !13, metadata !2, metadata !2, metadata !14, metadata !17, metadata !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/b.cpp] [DW_LANG_C_plus_plus]
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!13 = metadata !{metadata !"b.cpp", metadata !"/tmp/dbginfo"}
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!14 = metadata !{metadata !15}
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!15 = metadata !{metadata !"0x2e\00func\00func\00_Z4funci\001\000\001\000\006\00256\000\001", metadata !13, metadata !16, metadata !6, null, i32 (i32)* @_Z4funci, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 1] [def] [func]
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!16 = metadata !{metadata !"0x29", metadata !13} ; [ DW_TAG_file_type ] [/tmp/dbginfo/b.cpp]
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!17 = metadata !{metadata !18}
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!18 = metadata !{metadata !"0x34\00y\00y\00\004\000\001", null, metadata !16, metadata !11, i32 (i32)** @y, null} ; [ DW_TAG_variable ] [y] [line 4] [def]
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!19 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
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!20 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
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!21 = metadata !{metadata !"clang version 3.5.0 "}
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!22 = metadata !{metadata !"0x101\00i\0016777217\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ] [i] [line 1]
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!23 = metadata !{i32 1, i32 0, metadata !4, null}
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!24 = metadata !{i32 2, i32 0, metadata !4, null}
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